Language：English   Publishing type：Research paper (scientific journal)   Publisher：Frontiers in Immunology  

The newly emerged severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is causing a spread of coronavirus disease 2019 (COVID-19) globally. In order to end the COVID-19 pandemic, an effective vaccine against SARS-CoV-2 must be produced at low cost and disseminated worldwide. The spike (S) protein of coronaviruses plays a pivotal role in the infection to host cells. Therefore, targeting the S protein is one of the most rational approaches in developing vaccines and therapeutic agents. In this study, we optimized the expression of secreted trimerized S protein of SARS-CoV-2 using a silkworm-baculovirus expression vector system and evaluated its immunogenicity in mice. The results showed that the S protein forming the trimeric structure was the most stable when the chicken cartilage matrix protein was used as the trimeric motif and could be purified in large amounts from the serum of silkworm larvae. The purified S protein efficiently induced antigen-specific antibodies in mouse serum without adjuvant, but its ability to induce neutralizing antibodies was low. After examining several adjuvants, the use of Alum adjuvant was the most effective in inducing strong neutralizing antibody induction. We also examined the adjuvant effect of paramylon from Euglena gracilis when administered with the S protein. Our results highlight the effectiveness and suitable construct design of the S protein produced in silkworms for the subunit vaccine development against SARS-CoV-2.

DOI： 10.3389/fimmu.2021.803647

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/cells10123505

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s12033-021-00373-0

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1186/s13567-021-00971-5

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.3390/insects12060517

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.aspen.2021.04.011

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1101/2021.03.13.435221

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acsomega.0c05635

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acs.biochem.0c00523

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.bbrc.2020.06.020

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ibmb.2020.103458

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.aspen.2020.05.001

Language：English   Publishing type：Research paper (scientific journal)  

Interleukine-4 (IL-4) is a cytokine that plays an important role in the immune system and recognized as a biological medicine. Therefore, there is a demand for the production of IL-4 with high performance. The expression of a recombinant IL-4 protein in the prokaryotic system usually results in the formation of an inclusion body. To date, the solution to obtain those active products without the refolding process remains to be established. In this study, we tried to acquire a biologically active recombinant Mus musculus IL-4 (rMmIL-4) using a silkworm-baculovirus expression vector system (silkworm-BEVS). We constructed two recombinant baculoviruses coding rMmIL-4 with the distinct location of affinity purification tags and succeeded in the expression and purification of rMmIL-4 proteins directly without the refolding process. Both purified proteins displayed comparable biological activity to the commercial proteins produced by the E. coli expression system. Besides, we performed screening of silkworm strains to seek optimal hosts for the mass-production of rMmIL-4. Intriguingly, we found that some silkworm strains showed significantly higher secretion levels of rMmIL-4 in silkworm sera. Our study provides meaningful insights into the industrial-scale production of rMmIL-4 with high productivity for pharmaceutical applications in the future.

DOI： 10.1016/j.aspen.2019.12.014

Language：English   Publishing type：Research paper (scientific journal)  

Type IB DNA topoisomerases are enzymes to change the topological state of DNA molecules and are essential in studying replication, transcription, and recombination of nucleic acids in vitro. DNA topoisomerase IB from Vaccinia virus (vTopIB) is a 32 kDa, type I eukaryotic topoisomerase, which relaxed positively and negatively supercoiled DNAs without Mg²⁺ and ATP. Although vTopIB has been effectively produced in E. coli expression system, no studies remain available to explore an alternative platform to express recombinant vTopIB (rvTopIB) in a higher eukaryote, where the one can expect post-translational modifications that affect the activity of rvTopIB. Here in this study, rvTopIB with N-terminal tags was constructed and expressed in a silkworm–baculovirus expression vector system (silkworm–BEVS). We developed a simple two consecutive chromatography purification to obtain highly pure rvTopIB. The final yield of rvTopIB obtained from a baculovirus-infected silkworm larva was 83.25 μg. We also evaluated the activity and function of rvTopIB by the DNA relaxation activity assays using a negatively supercoiled pUC19 plasmid DNA as a substrate. With carefully assessing optimized conditions for the reaction buffer, we found that divalent ions, Mg²⁺, Mn²⁺, Ca²⁺, as well as ATP stimulate the DNA relaxation activity by rvTopIB. The functional and active form of rvTopIB, together with the yields of the protein we obtained, suggests that silkworm–BEVS would be a potential alternative platform to produce eukaryotic topoisomerases on an industrial scale.

DOI： 10.1007/s12033-019-00184-4

Language：English   Publishing type：Research paper (scientific journal)  

Human granulocyte-macrophage colony stimulating factor (hGM-CSF) is a hematopoietic growth factor. It is widely employed as a therapeutic agent targeting neutropenia in cancer patients undergoing chemotherapy and in patients with AIDS or after bone marrow transplantation. In this study, we constructed the recombinant baculoviruses for the expression of recombinant hGM-CSF (rhGM-CSF) with two small affinity tags (His-tag and Strep-tag) at the N or C-terminus. Compared to N-tagged rhGM-CSF, C-tagged rhGM-CSF was highly recovered from silkworm hemolymph. The purified rhGM-CSF proteins migrated as a diffuse band and were confirmed to hold N-glycosylations. A comparable activity was achieved when commercial hGM-CSF was tested as a control. Considering the high price of hGM-CSF in the market, our results and strategies using silkworm-baculovirus system can become a great reference for mass production of the active rhGM-CSF at a lower cost.

DOI： 10.1016/j.pep.2019.03.010

Language：English   Publishing type：Research paper (scientific journal)  

Reverse transcriptase from Moloney murine leukemia virus (MMLVRT) is an RNA dependent DNA polymerase, which has been used as a fundamental tool for molecular biology and biotechnology. The secondary structures formed in the RNA templates decrease the accessibility of the reverse transcriptase to the RNA templates; it is important to unfold the RNA secondary structure by increasing the reaction temperature to perform the successful transcription. In this study, we applied silkworm baculovirus expression vector system (silkworm-BEVS) to mass-produce and purify the recombinant MMLVRTs with the N- or C- terminal tandem tags. We confirmed that both of the recombinant MMLVRT enzymes have intact DNA polymerase activity. It is notable that C- terminal tagged MMLVRT outperformed MMLVRT obtained from the E. coli expression system in terms of thermostability and sensitivity to low quantities of RNA template. Taken together, these results demonstrate that silkworm-BEVS is a promising alternative strategy to produce the functional and thermostable reverse transcriptase.

DOI： 10.1016/j.aspen.2019.02.008

Language：English   Publishing type：Research paper (scientific journal)  

The O-glycosidase, endo-α-N-acetylgalactosaminidase from Enterococcus faecalis (endoEF) catalyzes the cleavage of core 1 and core 3 type O-linked disaccharides between GalNAc and serine or threonine residues from glycoproteins. The endoEF has broad substrate specificity and thus is extensively utilized for the structural and functional analysis of the O-linked glycans. In this study, we expressed and purified the recombinant endoEF (rEndoEF) by using the silkworm-baculovirus expression vector system (Silkworm-BEVS) and confirmed the deglycosylation activity of rEndoEF targeting reporter glycoproteins, which was equivalent to the commercial O-glycosidase. Thus, our study provides important clues to produce highly active rEndoEF O-glycosidases employing silkworm-BEVS as an alternative.

DOI： 10.1016/j.aspen.2019.01.009

Language：English   Publishing type：Research paper (scientific journal)  

Rapid, convenient, sensitive detection methods are of the utmost importance in analytical tools. Enzyme-based signal amplification using horseradish peroxidase (HRP) is commonly implemented in clinical diagnostics kits based on enzyme-linked immunosorbent assay (ELISA), by which the limit of detection is greatly improved. Herein we report the design and preparation of recombinant fusion proteins comprising HRP and streptavidin (Stav), in which HRP was fused to either the N- or C-terminus of Stav ((HRP)
₄
–Stav or Stav–(HRP)
₄
, respectively) using a baculovirus-silkworm expression system. Both (HRP)
₄
–Stav and Stav–(HRP)
₄
were secreted in the apo form but they were easily converted to the holo form and activated by simple incubation with hemin overnight at 4 °C. The activated (HRP)
₄
–Stav and Stav–(HRP)
₄
could be combined with a commercial biotinylated anti-OVA IgG antibody to detect ovalbumin (OVA) as the antigen in ELISA. The enzymatic activity of (HRP)
₄
–Stav was twofold higher than that of Stav–(HRP)
₄
, and the sensitivity of (HRP)
₄
-Stav in ELISA was higher than that of a commercial HRP–Stav chemical conjugate. The successful use of (HRP)
₄
–Stav chimeric protein as a molecular probe in ELISA shows that the baculovirus-silkworm expression system is promising to produce enzyme–Stav conjugates to substitute for those prepared by chemical methods.

DOI： 10.1016/j.jbiotec.2019.03.007

Language：English   Publishing type：Research paper (scientific journal)  

Mucin-type O-glycosylation is initiated by UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferases (ppGalNAc-Ts or PGANTs), attaching GalNAc to serine or threonine residue of a protein substrate. In the insect model from Lepidoptera, silkworm (Bombyx mori), however, O-glycosylation pathway is totally unexplored and remains largely unknown. In this study, as the first report regarding protein O-glycosylation analysis in silkworms, we verified the O-glycan profile that a common core 1 Gal (β1-3) GalNAc disaccharide branch without terminally sialylated structure is mainly formed for a baculovirus-produced human proteoglycan 4 (PRG4) protein. Intriguingly, functional screenings in cultured silkworm BmN4 cells for nine Bmpgants reveal that Bmpgant2 is the solo functional BmPGANT for PRG4, implying that Bmpgants may have unique cell/tissue or protein substrate preferences. Furthermore, a recombinant BmPGANT2 protein was successfully purified from silkworm-BEVS and exhibited a high ability to transfer GalNAc for both peptide and protein substrates. Taken together, the present results clarified the functional BmPGANT2 in cultured silkworm cells, providing crucial fundamental insights for future studies dissecting the detailed silkworm O-glycosylation pathways and productions of glycoproteins with O-glycans.

DOI： 10.1007/s00253-018-9309-6

Language：English   Publishing type：Research paper (scientific journal)  

Recombinant protein production can create artificial proteins with desired functions by introducing genetic modifications to the target proteins. Horseradish peroxidase (HRP) has been used extensively as a reporter enzyme in biotechnological applications; however, recombinant production of HRP has not been very successful, hampering the utilization of HRP with genetic modifications. A fusion protein comprising an antibody binding protein and HRP will be an ideal bio-probe for high-quality HRP-based diagnostic systems. A HRP-protein A/G fusion protein (HRP-pAG) is designed and its production in silkworm (Bombyx mori) is evaluated for the first time. HRP-pAG is expressed in a soluble apo form, and is activated successfully by incubating with hemin. The activated HRP-pAG is used directly for ELISA experiments and retains its activity over 20 days at 4 °C. Moreover, HRP-pAG is modified with biotin by the microbial transglutaminase (MTG) reaction. The biotinylated HRP-pAG is conjugated with streptavidin to form a HRP-pAG multimer and the multimeric HRP-pAG produced higher signals in the ELISA system than monomeric HRP-pAG. The successful production of recombinant HRP in silkworm will contribute to creating novel HRP-based bioconjugates as well as further functionalization of HRP by applying enzymatic post-translational modifications.

DOI： 10.1002/biot.201700624

Language：English   Publishing type：Research paper (scientific journal)  

As a therapeutic treatment, recombinant human basic fibroblast growth factor (rhbFGF) is usually employed in tissue regeneration, and as an essential component in culture medium for maintaining the induced pluripotent stem (iPS) cell and embryonic stem (ES) cell in an undifferentiated state. Therefore, a large amount of biologically active rhbFGF is required. In this study, silkworm-baculovirus expression vector system (silkworm-BEVS) is employed to achieve a high productivity of recombinant rhbFGF with two small affinity tags (His-tag and STREP-tag) at the N or C-terminus. It is observed that rhbFGF with 30 K signal peptide of silkworm were successfully expressed but are not sufficiently secreted into the culture medium of cultured insect cells. Then we purified the N- or C-tagged intracellular rhbFGF protein and obtained a yield of about 0.7 mg/larva and 1.2 mg/larva, respectively. Although the final yield of the C-tagged rhbFGF is higher than that of the N-tagged, rhbFGF with N-tag demonstrated promising and comparable biological activity, which is evaluated through a mammalian cell proliferation assay. Taken together, these results indicate that silkworm-BEVS could contribute to the mass-production of the biologically active rhbFGF for medical uses.

DOI： 10.1016/j.aspen.2018.05.002

Language：English   Publishing type：Research paper (scientific journal)  

Human α
₁
-antitrypsin (AAT) is the most abundant serine proteinase inhibitor (serpin) in the human plasma. Commercially available AAT for the medications of deficiency of α
₁
-antitrypsin is mainly purified from human plasma. There is a high demand for a stable and low-cost supply of recombinant AAT (rAAT). In this study, the baculovirus expression vector system using silkworm larvae as host was employed and a large amount of highly active AAT was recovered from the silkworm serum (~ 15 mg/10 ml) with high purity. Both the enzymatic activity and stability of purified rAAT were comparable with those of commercial product. Our results provide an alternative method for mass production of the active rAAT in pharmaceutical use.

DOI： 10.1007/s12033-018-0127-y

Language：English   Publishing type：Research paper (scientific journal)  

Rheumatoid factors (RFs) are autoantibodies against the fragment-crystallizable (Fc) region of IgG. In individuals with hematological diseases such as cryoglobulinemia and certain B cell lymphoma forms, the RFs derived from specific heavy- and light-chain germline pairs, so-called “stereotypic RFs,” are frequently produced in copious amounts and form immune complexes with IgG in serum. Of note, many structural details of the antigen recognition mechanisms in RFs are unclear. Here we report the crystal structure of the RF YES8c derived from the IGHV1-69/IGKV3-20 germline pair, the most common of the stereotypic RFs, in complex with human IgG1-Fc at 2.8 Å resolution. We observed that YES8c binds to the CH2–CH3 elbow in the canonical antigen-binding manner involving a large antigen–antibody interface. On the basis of this observation, combined with mutational analyses, we propose a recognition mechanism common to IGHV1-69/IGKV3-20 RFs: (1) the interaction of the Leu
⁴³²
–His
⁴³⁵
region of Fc enables the highly variable complementarity-determining region (CDR)-H3 to participate in the binding, (2) the hydrophobic tip in the CDR-H2 typical of IGHV1-69 antibodies recognizes the hydrophobic patch on Fc, and (3) the interaction of the highly conserved RF light chain with Fc is important for RF activity. These features may determine the putative epitope common to the IGHV1-69/IGKV3-20 RFs. We also showed that some mutations in the binding site of RF increase the affinity to Fc, which may aggravate hematological diseases. Our findings unravel the structural basis for germline-encoded antibody autoreactivity.

DOI： 10.1074/jbc.M117.814475

Language：English   Publishing type：Research paper (scientific journal)  

Porcine circovirus type 2 (PCV2) is a primary causative agent of postweaningmultisystemic wasting syndrome (PMWS), which has a significant economic impact on the swine industry. The capsid protein (Cap) encoded by ORF2 of the viral genome has been used effectively as a vaccine against PCV2 infection. The Cap protein can spontaneously assemble into virus-like particles (VLPs) that are safe and highly immunogenic for vaccine applications. Several expression systems, including bacteria, yeast and insect cells, have been utilized to produce PCV2 VLPs. However, in some cases, the recombinant Cap (rCap) proteins produced in bacteria and yeast do not assemble spontaneously. In this study, we expressed rCap protein using a silkworm–baculovirus expression vector system (silkworm–BEVS) for mass production of PCV2 VLPs and established a simple three-step protocol for its purification from pupae: extraction by detergent, ammonium sulfate precipitation and anion exchange column chromatography. Size-exclusion chromatography (SEC) analysis and transmission electron microscope (TEM) observation showed that purified rCap proteins formed VLPs with a similar morphology to that of the original virus. Furthermore, the VLPs produced in silkworms were capable of inducing neutralizing antibodies against PCV2 in mice. Our results demonstrated that the silkworm system is a powerful tool for the production of PCV2 VLPs and will be useful for the development of a reliable and cost-effective PCV2 vaccine.

DOI： 10.1099/jgv.0.001087

Language：English   Publishing type：Research paper (scientific journal)  

Virus-like particles (VLPs) are multi-protein complex, which mimic viral particles without viral genomes. Recently various applications of VLPs for medical and pharmaceutical fields are developed. Furthermore, surface modification of VLPs is expected to extend their functional versatility. As an enzymatic strategy for the modification, microbial transglutaminase (MTG) that catalyzes the covalent bond between a glutamine residue and a ly-sine residue or a primary amine is suitable for efficient protein ligation. In the previous study, we demonstrated the efficient production of immunogenic VLPs of porcine circovirus type 2 (PCV2) using silkworm-baculovirus expression vector system (silkworm-BEVS). Herein, we established the display system of exotic molecules to VLPs by enzymatic covalent cross-linking using MTG. For the target modification, Q-tag (YPLQMRG) that is MTG reactive sequence were introduced into the N-terminus, C-terminus, or loop BC of capsid protein of PCV2 and successfully expressed as VLPs in silkworm pupae. Of these, PCV2 VLPs with Q-tag at the loop BC and C-terminus were efficiently conjugated with FITC-cadaverine and K-tagged (MRHKGS) EGFP by MTG. These results showed that flexible surface modification of VLPs mediated by MTG could be used for development of several therapeutic tools such as multivalent vaccines.

DOI： 10.11416/jibs.87.2_053

Language：English   Publishing type：Research paper (scientific journal)  

The KOD DNA polymerase from Thermococcus kodakarensis (Tkod-Pol) has been preferred for PCR due to its rapid elongation rate, extreme thermostability and outstanding fidelity. Here in this study, we utilized silkworm-baculovirus expression vector system (silkworm-BEVS) to express the recombinant Tkod-Pol (rKOD) with N-terminal (rKOD-N) or C-terminal (rKOD-C) tandem fusion tags. By using BEVS, we produced functional rKODs with satisfactory yields, about 1.1 mg/larva for rKOD-N and 0.25 mg/larva for rKOD-C, respectively. Interestingly, we found that rKOD-C shows higher thermostability at 95 °C than that of rKOD-N, while that rKOD-N is significantly unstable after exposing to long period of heat-shock. We also assessed the polymerase activity as well as the fidelity of purified rKODs under various conditions. Compared with commercially available rKOD, which is expressed in E. coli expression system, rKOD-C exhibited almost the same PCR performance as the commercial rKOD did, while rKOD-N did lower performance. Taken together, our results suggested that silkworm-BEVS can be used to express and purify efficient rKOD in a commercial way.

DOI： 10.1007/s12033-017-0008-9

Language：English   Publishing type：Research paper (scientific journal)  

Baculovirus expression vector system (BEVS) is widely known as a mass-production tool to produce functional recombinant glycoproteins except that it may not be always suitable for medical practice due to the differences in the structure of N-linked glycans between insects and mammalian. Currently, various approaches have been reported to alter N-linked glycan structures of glycoproteins derived from insects into terminally sialylated complex-type N-glycans. In the light of those studies, we also proposed in vitro maturation of N-glycan with mass-produced and purified glycosyltransferases by silkworm–BEVS. β-1,4-Galactosyltransferase 1 (β4GalT1) is known as one of type II transmembrane enzymes that transfer galactose in a β-1, 4 linkage to accepter sugars, and a key enzyme for further sialylation of N-glycans. In this study, we developed a large-scale production of recombinant human β4GalT1 (rhβ4GalT1) with N- or C-terminal tags in silkworm–BEVS. We demonstrated that rhβ4GalT1 is N-glycosylated and without mucin-type glycosylation. Interestingly, we found that purified rhβ4GalT1 from silkworm serum presented higher galactosyltransferase activity than that expressed from cultured mammalian cells. We also validated the UDP-galactose transferase activity of produced rhβ4GalT1 proteins by using protein subtracts from silkworm silk gland. Taken together, rhβ4GalT1 from silkworms can become a valuable tool for producing high-quality recombinant glycoproteins with mammalian-like N-glycans.

DOI： 10.1007/s12033-017-0003-1

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DOI： 10.1016/j.bbrc.2016.09.151

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DOI： 10.1016/j.aspen.2016.07.007

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DOI： 10.1016/j.aspen.2016.03.014

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DOI： 10.1007/s12257-016-0042-7

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DOI： 10.1007/s12033-016-9937-y

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DOI： 10.1016/j.cbd.2015.07.003

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DOI： 10.1007/s11010-015-2529-5

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DOI： 10.1016/j.jbiosc.2015.02.013

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DOI： 10.1007/s12033-015-9866-1

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DOI： 10.1016/j.aspen.2013.10.009

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DOI： 10.1007/s10529-013-1183-9

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DOI： 10.1002/arch.21083

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DOI： 10.1111/j.1744-7917.2012.01569.x

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DOI： 10.2478/s11535-012-0112-6

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DOI： 10.1371/journal.pone.0052320

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DOI： 10.2108/zsj.29.786

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DOI： 10.1007/s10529-012-0971-y

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Repository Public URL： http://hdl.handle.net/2324/25203

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DOI： 10.1016/j.cellbi.2005.07.007

Publisher：Journal of Virological Methods  

Norovirus (NoV) is one of the major causes of acute viral gastroenteritis in humans. Genetic variation is abundant, and prevalent genotypes vary from year to year and region to region. Since NoVs are difficult to amplify in cultured cells, genome RNA-free virus-like particles (VLPs) that mimic the capsid structure of the virus are promising vaccine candidates for the prevention of NoVs infection, and the development of multivalent VLP vaccines is required to prevent NoV infection in a wide range of genotypes. In this study, we attempted to produce NoV VLPs of the top nine genotypes that have a history of epidemics in Japan using the silkworm-baculovirus expression vector system (silkworm-BEVS), which has a proven track record in the mass production of recombinant proteins. In silkworm pupae infected with recombinant baculoviruses constructed to express VP1s, the major protein that forms VLP, the NoV VP1 protein was expressed in large amounts. Most genotypes of VP1 accumulated in the cytoplasm as soluble proteins, but solubility was reduced for that of two genotypes. VP1s of five genotypes could be purified in large quantities (>0.9 mg per pupa) by a two-step purification process, and gel filtration chromatography analysis confirmed the formation of VLPs. This study demonstrates the utility of silkworm-BEVS in producing NoV VLPs of multiple genotypes and provides the basis for the development of a multivalent vaccine against genetically diverse NoV infections.

DOI： 10.1016/j.jviromet.2024.115038

Scopus

Publisher：Journal of Virological Methods  

The silkworm-baculovirus expression vector system (silkworm-BEVS), using Bombyx mori nucleopolyhedrovirus (BmNPV) and silkworm larvae or pupae, has been used as a cost-effective expression system for the production of various recombinant proteins. Recently, several gene knockouts in baculoviruses have been shown to improve the productivity of recombinant proteins. However, the gene editing of the baculovirus genome (approximately 130 kb) remains challenging and time-consuming. In this study, we sought to further enhance the productivity of the silkworm-BEVS by synthesizing and gene editing the BmNPV bacmid from plasmids containing fragments of BmNPV genomic DNA using a two-step Golden Gate Assembly (GGA). The BmNPV genome, divided into 19 fragments, was amplified by PCR and cloned into the plasmids. From these initial plasmids, four intermediate plasmids containing the BmNPV genomic DNA were constructed by GGA with the type IIS restriction enzyme BsaI. Subsequently, the full-length bacmid was successfully synthesized from the four intermediate plasmids by GGA with another type IIS restriction enzyme PaqCI with a high efficiency of 97.2 %. Furthermore, this methodology enabled the rapid and straightforward generation of the BmNPV bacmid lacking six genes, resulting in the suppression of degradation of recombinant proteins expressed in silkworm pupae. These results indicate that the BmNPV bacmid can be quickly and efficiently edited using only simple cloning techniques and enzymatic reactions, marking a significant advancement in the improvement of the silkworm-BEVS.

DOI： 10.1016/j.jviromet.2024.115029

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Human Antibodies  

BACKGROUND: A cost-effective and eco-friendly method is needed for the assessment of humoral immunity against SARS-CoV-2 in large populations. OBJECTIVE: We investigated the performance of an ELISA that uses silkworm-produced proteins to quantify the strain-specific anti-Spike IgG (anti-S IgG) titer. METHODS: The OD values for the anti-His-tag antibody, a standard material of ELISA quantification, were measured. Correlations between the ELISA for each strain and the Abbott SARS-CoV-2 IgG II Quant assay for the wild type were evaluated with serum samples from nine participants with various infection and vaccination statuses. RESULTS: Linear dose-responses were confirmed by high coefficients of determination: 0.994, 0.994, and 0.996 for the wild-type, Delta, and Omicron (BA.1) strain assays, respectively. The coefficient of determination for the wild-type and Delta strain assays was high at 0.959 and 0.892, respectively, while the Omicron strain assay had a relatively low value of 0.563. Booster vaccinees showed similar or higher titers against all strains compared to infected persons without vaccination. The Omicron-infected persons without vaccination had lower antibody titers against wild type than did the vaccinated persons. CONCLUSIONS: This study provides data indicating that the ELISA with silkworm-produced proteins makes it possible to discriminate and quantify the strain-specific anti-S IgG antibody induced by vaccination or infection.

DOI： 10.3233/HAB-230006

Scopus

Publisher：Comparative Biochemistry and Physiology Part - C: Toxicology and Pharmacology  

Tributyltin (TBT)-binding protein type 1 in Japanese medaka (Oryzias latipes) (O.latTBT-bp1) is a fish lipocalin implicated in TBT binding and detoxification. We purified recombinant O.latTBT-bp1 (rO.latTBT-bp1; ca. 30 kDa) by using a baculovirus expression system and His- and Strep-tag chromatography process. Then, we examined O.latTBT-bp1 binding to several endo/exogenous steroid hormones by means of competitive binding assay. The dissociation constants for the binding of rO.latTBT-bp1 to DAUDA and ANS, two fluorescent ligands of lipocalin, were 7.06 and 13.6 μM, respectively. Multiple model validations indicated that a single-binding-site model was the most appropriate for evaluating rO.latTBT-bp1 binding. In the competitive binding assay, testosterone, 11-ketotestosterone, and 17β-estradiol were each bound by rO.latTBT-bp1; rO.latTBT-bp1 showed the strongest affinity for testosterone (inhibition constant, Ki = 3.47 μM). Endocrine-disrupting chemical (synthetic steroid) also bound to rO.latTBT-bp1; the affinity for ethinylestradiol (Ki = 9.29 μM) was stronger than that for 17β-estradiol (Ki = 30.0 μM). To determine the function of O.latTBT-bp1, we produced TBT-bp1 knockout medaka (TBT-bp1 KO), which we exposed to ethinylestradiol for 28 days. After exposure, the number of papillary processes in TBT-bp1 KO genotypic male medaka was significantly fewer (3.5), compared to that in wild-type male medaka (22). Thus, TBT-bp1 KO medaka were more sensitive to the anti-androgenic effects of ethinylestradiol than wild-type medaka. These results indicate that O.latTBT-bp1 may bind to steroids and act as a gatekeeper of ethinylestradiol action by regulating the androgen–estrogen balance.

DOI： 10.1016/j.cbpc.2023.109660

Scopus

Publisher：Insects  

Spermatogenesis is an important process in reproduction and is conserved across species, but in Bombyx mori, it shows peculiarities, such as the maintenance of spermatogonia by apical cells and fertilization by dimorphic spermatozoa. In this study, we attempted to characterize the genes expressed in the testis of B. mori, focusing on aspects of expression patterns and gene function by transcriptome comparisons between different tissues, internal testis regions, and Drosophila melanogaster. The transcriptome analysis of 12 tissues of B. mori, including those of testis, revealed the widespread gene expression of 20,962 genes and 1705 testis-specific genes. A comparative analysis of the stem region (SR) and differentiated regions (DR) of the testis revealed 4554 and 3980 specific-enriched genes, respectively. In addition, comparisons with D. melanogaster testis transcriptome revealed homologs of 1204 SR and 389 DR specific-enriched genes that were similarly expressed in equivalent regions of Drosophila testis. Moreover, gene ontology (GO) enrichment analysis was performed for SR-specific enriched genes and DR-specific enriched genes, and the GO terms of several biological processes were enriched, confirming previous findings. This study advances our understanding of spermatogenesis in B. mori and provides an important basis for future research, filling a knowledge gap between fly and mammalian studies.

DOI： 10.3390/insects14080684

Scopus

Publisher：Journal of Pharmaceutical Sciences  

Malaria is a mosquito-borne infectious disease that is widespread in developing countries. Malaria vaccines are important in efforts to eradicate malaria; however, vaccines are usually administered by injection, which requires medical personnel and has a risk of causing infection. Transdermal vaccines can be administered without damaging the skin and thus are ideal for the prevention of malaria. However, the stratum corneum forms a "brick and mortar" like structure in which stratum corneum cells are embedded in a hydrophobic matrix composed of lipids, which strongly inhibits the permeation of hydrophilic substances. In the present study, we designed a transdermal vaccine against vivax malaria using a solid-in-oil (S/O) dispersion. The S/O dispersion of a transmission blocking vaccine candidate, Pvs25 from Plasmodium vivax, showed higher skin penetration than that of the aqueous solution. Mice immunized with the S/O dispersion generated antibodies at similar titers as the mice immunized by injection, over the mid- to long-term. These results provide information for the development of transdermally administered malaria vaccines toward the eradication of malaria.

DOI： 10.1016/j.xphs.2022.10.031

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.xphs.2022.10.031

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.3390/ijms24010102

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Insect Biochemistry and Molecular Biology  

Advances in sequencing technology and bioinformatics have accelerated gene discovery and homology-based functional annotation in many species, and numerous targeted gene studies have greatly expanded the understanding of gene functions. Nevertheless, there are still many genes that lack homology with genes in other evolutionary lineages and are left as genes with unknown functions. We constructed a gene co-expression network from the Bombyx mori ovary-derived cell line, BmN4, and attempted to infer the biological roles of uncharacterized genes based on the correlation between the function-known and unknown genes. Within this network, we focused on the co-expression modules involved in chromosome architecture, dynamics, and integrity, and selected the uncharacterized genes for subsequent RNAi-based phenotypic screening. This approach enabled the identification of 5 genes whose knockdown led to abnormalities in chromosome dynamics and spindle morphology in mitosis. One of them was a recently characterized gene, BmCenp-T, which plays a central role in building the kinetochore protein complex on the silkworm holocentric chromosomes. In this study, we suggest a method for constructing the gene co-expression network and selecting candidate genes for small-scale RNAi screening. This approach is complementary to homology-based annotation and may be useful for the analysis of lineage-specific uncharacterized genes such as orphan genes.

DOI： 10.1016/j.ibmb.2022.103875

Scopus

Publisher：Protein Expression and Purification  

Plasmodium vivax ookinete surface protein, Pvs25, is a candidate for a transmission-blocking vaccine (TBV) for malaria. Pvs25 has four EGF-like domains containing 22 cysteine residues forming 11 intramolecular disulfide bonds, a structural feature that makes its recombinant protein expression difficult. In this study, we report the high expression of recombinant Pvs25 as a soluble form in silkworm, Bombyx mori. The Pvs25 protein was purified from hemolymphs of larvae and pupae by affinity chromatography. In the Pvs25 expressed by silkworm, no isoforms with inappropriate disulfide bonds were found, requiring no further purification step, which is necessary in the case of Pichia pastoris-based expression systems. The Pvs25 from silkworm was confirmed to be molecularly uniform by sodium dodecyl sulfate gel electrophoresis and size-exclusion chromatography. To examine the immunogenicity, the Pvs25 from B. mori was administered to BALB/c mice subcutaneously with oil adjuvant. The Pvs25 produced by silkworm induced potent and robust immune responses, and the induced antisera correctly recognized P. vivax ookinetes in vitro, demonstrating the potency of Pvs25 from silkworm as a candidate for a malaria TBV. To the best of our knowledge, this is the first study to construct a system for mass-producing malaria TBV antigens using silkworm.

DOI： 10.1016/j.pep.2022.106096

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.3390/insects13070631

Publisher：Insects  

Heterochromatin protein 1 plays an important role in chromatin structure and gene expression regulation. Three HP1 genes have been found in Homo sapiens, and five HP1 genes have been reported in Drosophila melanogaster. On the other hand, in Bombyx mori, only two HP1 genes, BmHP1a and BmHP1b, were reported. In this research, we have reported the molecular and functional characterization of a novel Bombyx mori HP1 gene (BmHP1c), which had stronger transcriptional repression activity than BmHP1a. BmHP1a and BmHP1b is reported to form homo- and heterodimers, but in co-immunoprecipitation experiments, no homo- or hetero-dimer formation of BmHP1c with the other silkworm HP1s is detected. The intracellular localization of BmHP1c is not only in the nucleus but also in the cytoplasm like mammalian HP1γ. In contrast to human HP1a and b, all three BmHP1s were localized preferentially in the regions poorly stained with DAPI. Interestingly, the double knockdown of BmHP1a and b, but not BmHP1c with a or b, arrested the cell cycle at the G2/M phase. These results suggest that BmHP1c is not essential for cell progression and plays a different role than BmHP1a and BmHP1b.

DOI： 10.3390/insects13070631

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Insect Biochemistry and Molecular Biology  

The ovary is an important organ in reproduction. In insects, especially lepidopteran insects, the oocytes and reproductive organs develop rapidly during the pupal stage. Despite their drastic morphological changes, the molecular mechanisms of ovary development are not fully understood. In this study, it is found that forkhead box transcription factor L2, member 1 (FoxL21), which is known to be involved in ovarian differentiation and maintenance in vertebrates, is required for the development of the ovary in the silkworm, Bombyx mori. FoxL21 was expressed in the ovary and ovariole during the larval and pupal stage, respectively. In silkworms in which FoxL21 was knocked out by genome editing, multiple ovarian dysfunctions, such as, abnormal egg formation, thinning of the ovariole sheaths, and defective connection of the oviductus geminus with the ovariole were observed. Finally, ovarian transplantation experiments using the knockout silkworms revealed that FoxL21 functions in the ovariole, but not in the oviductus geminus.

DOI： 10.1016/j.ibmb.2022.103737

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ibmb.2021.103636

Language：English   Publishing type：Research paper (scientific journal)  

Selectins are key to mediating interactions involved in cellular adhesion and migration, underlying processes such as immune responses, metastasis, and transplantation. Selectins are composed of a lectin domain, an epidermal growth factor (EGF)-like domain, multiple short consensus repeats (SCRs), a transmembrane domain, and a cytoplasmic tail. It is well-established that the lectin and EGF domains are required to mediate interactions with ligands; however, the contributions of the other domains in mediating these interactions remain obscure. Using various E-selectin constructs produced in a newly developed silkworm-based expression system and several assays performed under both static and physiological flow conditions, including flow cytometry, glycan array analysis, surface plasmon resonance, and cell-rolling assays, we show here that a reduction in the number of SCR domains is correlated with a decline in functional E-selectin binding to hematopoietic cell E- and/or L-selectin ligand (HCELL) and P-selectin glycoprotein ligand-1 (PSGL-1). Moreover, the binding was significantly improved through E-selectin dimerization and by a substitution (A28H) that mimics an extended conformation of the lectin and EGF domains. Analyses of the association and dissociation rates indicated that the SCR domains, conformational extension, and dimerization collectively contribute to the association rate of E-selectin–ligand binding, whereas just the lectin and EGF domains contribute to the dissociation rate. These findings provide the first evidence of the critical role of the association rate in functional E-selectin–ligand interactions, and they highlight that the SCR domains have an important role that goes beyond the structural extension of the lectin and EGF domains.

DOI： 10.1074/jbc.RA119.010910

Language：English   Publishing type：Research paper (scientific journal)  

In insect cell culture, a fetal bovine serum is often used to maintain the cellular physiological conditions, irre-spective of its relatively high cost and unstable supply. Several serum-free media for insects were developed, but it is challenging to adopt some insect cells to these serum-free media. Silkworm serum was used as a re-placement of fetal bovine serum for a long time but not used widely due to the melanization of insect serum catalyzed by phenoloxidase (PO). PO inhibitors reported for insect serum preparation have a significantly nega-tive effect on the long-term culture of healthy insect cells. In this study, we evaluated several kinds of PO inhibi-tors and found the method to prepare silkworm serum, which is suitable for the maintenance of insect cells and the production of the recombinant proteins by the baculovirus expression system. When L-Glutathione (reduced form) or L-Cysteine is used as a PO inhibitor at the time of recovery of silkworm serum, it is possible to sup-press the browning of the silkworm serum. However, in this state of silkworm serum, browning is observed in long-term cell culture use. Therefore, it is preferable for cell culture to add 10% of silkworm serum treated at 50°C for 30 minutes to the medium with 2.7 mM L-Glutathione. Our results suggest that silkworm serum can be an alternative of mammalian serum for cell culture and used for producing the proteins for clinical application without any risk of contamination of zoonotic infectious disease viruses.

DOI： 10.11416/jibs.89.1_009

Language：English   Publishing type：Research paper (scientific journal)  

The receptor for advanced glycation end products (RAGE) recognizes Ca⁺⁺-binding proteins, such as members of the S100 protein family released by dead or devitalized tissues, and plays an important role in inflammatory responses. We recently identified the Ca⁺⁺-binding protein, venestatin, secreted from the rodent parasitic nematode, Strongyloides venezuelensis. We herein characterized recombinant venestatin, which is abundantly produced by the silkworm-baculovirus expression system (silkworm-BES), particularly in its interaction with RAGE. Venestatin from silkworm-BES possessed a binding capacity with Ca⁺⁺ ions and vaccine immunogenicity against S. venezuelensis larvae in mice, which is similar to venestatin produced by the E. coli expression system (EES). Venestatin from silkworm-BES had a higher affinity for human recombinant RAGE than that from EES, and their affinities were Ca⁺⁺-dependent. RAGE in the mouse lung co-immunoprecipitated with venestatin from silkworm-BES administered intranasally, indicating that it bound endogenous mouse RAGE. The present results suggest that venestatin from silkworm-BES affects RAGE-mediated pathological processes.

DOI： 10.1016/j.meegid.2019.103964

Language：English   Publishing type：Research paper (scientific journal)  

Follitropin, an important gonadotropin hormone, participates in vitellogenesis and spermatogenesis. Equine chorionic gonadotropin (eCG) can induce gonadotropin hormone activity in non-equid species and exhibits a long biological half-life. Here, we report the production, using silkworm larval and pupal systems, of biologically active recombinant hybrid-type follitropins based on the coding sequence of the eCG C-terminal peptide (CTP) between the mature β- and α-chains of eel. The three constructs, rJeFSH, rJeFSH·eCG, and rJeFSH·2xeCG were produced and verified to be N- or O-glycosylated and secreted mature peptides. Although rJeFSH·eCG contains more elaborate O-linked carbohydrate chains than rJeFSH, it elicited no significant in vitro oocyte maturation, which may be a result of insufficient terminal sialylation of its N-and O-linked carbohydrate chains. Then, a hybrid of rJeFSH·2xeCG extended with two eCG CTP. Furthermore, the receptor binding assay revealed potency of rJeFSH and rJeFSH·2xeCG to be a few folds greater than that of rJeFSH·eCG. The findings of this study will be useful for the development of more efficient GTHs in teleosts, including eels, when various modifications with two or more extended eCG CTP produced by silkworm are included.

DOI： 10.1007/s12257-019-0045-2

Language：English   Publishing type：Research paper (scientific journal)  

The polymerization of proteins can create newly active and large bio-macromolecular assemblies that exhibit unique functionalities depending on the properties of the building block proteins and the protein units in polymers. Herein, the first enzymatic polymerization of horseradish peroxidase (HRP) is reported. Recombinant HRPs fused with a tyrosine-tag (Y-tag) through a flexible linker at the N- and/or C-termini are expressed in silkworm, Bombyx mori. Trametes sp. laccase (TL) is used to activate the tyrosine of Y-tagged HRPs with molecular O₂ to form a tyrosyl-free radical, which initiates the tyrosine coupling reaction between the HRP units. A covalent dityrosine linkage is also formed through a HRP-catalyzed self-crosslinking reaction in the presence of H₂O₂. The addition of H₂O₂ in the self-polymerization of Y-tagged HRPs results in lower activity of the HRP polymers, whereas TL provides site-selectivity, mild reaction conditions and maintains the activity of the polymeric products. The cocrosslinking of Y-tagged HRPs and HRP-protein G (Y-HRP-pG) units catalyzed by TL shows a higher signal in enzyme-linked immunosorbent assay (ELISA) than the genetically pG-fused HRP, Y-HRP-pG, and its polymers. This new enzymatic polymerization of HRP promises to provide highly active and functionalized polymers for biomedical applications and diagnostics probes.

DOI： 10.1002/biot.201800531

Language：English   Publishing type：Research paper (scientific journal)  

Although Enterobacter sp. 532 shows pathogenicity in Bombyx mori, the insecticidal mechanisms are unclear. Here, we identified and characterised an insecticidal protein from Enterobacter. The insecticidal protein was purified from the strain and inoculated into B. mori larvae. Intracellular proteins were prepared, purified and separated by preparative native polyacrylamide gel electrophoresis (PAGE); one protein band had insecticidal activity. Sodium dodecyl sulfate-PAGE showed the presence of several bands, indicating that the insecticidal protein formed a complex. Peptide mass fingerprinting of a prominent 255.3-kDa band revealed 64 peptides that matched one protein with 33.0% sequence coverage. This protein was a homologue of the A component of the toxin complex (Tc), and the VRP1 domain was conserved; thus, the gene was named itcA (insecticidal toxin complex A). In the itcA downstream region, B and C component gene homologues were found, and these genes were located on an 86.2-kb contig sequence. Two repA genes and 27 genes related to conjugation transfer of plasmids were located on the contig, suggesting that the contig originated from a mobilisable plasmid. Therefore, these findings suggested that the strain may have acquired the Tc genes by horizontal transfer. This is the first description of Tc produced by the genus Enterobacter.

DOI： 10.1093/femsle/fny295

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11416/jibs.88.1_021

Language：English   Publishing type：Research paper (scientific journal)  

We investigated the gene structure and predicted amino acid sequence of the antioxidant enzyme 2-Cys peroxiredoxin (2-Cys Prx) in the raphidophyte Chattonella marina, which is a harmful algal bloom (HAB) species. The open reading frame of 2-Cys Prx was 585 bp long and encoded a protein consisting of 195 amino acids. The putative amino acid sequence contained two cysteine residues located at the 49th and 170th amino acid positions from the N-terminal methionine residue. The sequence also possessed 2-Cys Prx characteristic motifs, F (FFYPLDFTFVCPTEI) and EVCP. The position of the 2-Cys Prx gene relative to several others (ycf59–2-CysPrx–rpl35–rpl20) was the same as that found in the chloroplast genome in the raphidophyte Heterosigma akashiwo. Upstream of the 2-Cys Prx gene, possible TATA and GGA motifs recognized by nuclear-encoded plastid RNA polymerase (NEP), and a possible -10 box and -35 box recognized by plastid-encoded plastid RNA polymerase (PEP) were observed. We measured the transcript levels of 2-Cys Prx in C. marina cells grown under three different light intensities (0, 100, 1000 µmol photons m^–2 s^–1, 14-h light/8-h dark photoperiod) by quantitative PCR. The 2-Cys Prx transcript level in cells grown under the highest light intensity on day 3 was threefold that on day 0 but two lower light intensities resulted in relatively stable transcription levels. The 2-Cys Prx transcript level was significantly positively related to the H₂O₂ concentration per cell and the H₂O₂ scavenging activity per cell. These results suggest that C. marina 2-Cys Prx functions in the chloroplast and its transcription could be regulated by both NEP and PEP. Moreover, the 2-Cys Prx transcript level might increase to remove excessive H₂O₂ produced under strong light conditions in order to maintain cell proliferation activity.

DOI： 10.1080/09670262.2017.1346206

Language：English   Publishing type：Research paper (scientific journal)  

Polo-like kinase 1 (Plk1) is a crucial cell cycle regulator by its specific localization and activity during cell cycle. It has been shown that the phosphorylation and ubiquitylation of Plk1 are required for its own activation and localization. Here, we report that SUMOylation regulates the activity of Plk1 in the lepidopteran insect of Bombyx mori. In the absence of SUMOylation, it causes the lost localization of Plk1 on centrosomes and kinetochores, as well as an uneven distribution in midzone. We further identify that the putative SUMOylation site of Bombyx Plk1 at lysine 466 is required for its localization on centrosomes, and K466 mutation in Plk1 could influence its interaction with Smt3/Ubc9 complex. These findings are also confirmed by Drosophila Polo and human Plk1, which together reveals a conserved role of Plk1 SUMOylation in mammals. Moreover, conjugation of Smt3 to Plk1 SUMOylation mutant promotes its localization on centrosomes and kinetochores, and rescues functional defects of chromosome alignment in cells depleted of endogenous Plk1. Altogether, the present data indicate that the SUMOylation of Plk1 could participate in proper chromosome alignment and segregation during mitosis, and provides a novel layer for the regulation of Plk1 localization and activity throughout cell cycle.

DOI： 10.1038/s41598-017-15884-7

Language：English   Publishing type：Research paper (scientific journal)  

Piwi-interacting RNAs (piRNAs) are a class of small non-coding RNAs that associate with PIWI subfamily proteins, which play an important role in transposon silencing in animal germ cell. The piRNAs biogenesis is divided into two major pathways: primary and secondary, and both pathways are independent of double-stranded RNA-processing enzyme Dicer, which processes the single-stranded RNA transcripts in microRNA (miRNA) and siRNA (small interfering RNA) pathway. Primary piRNAs are processed from long non-coding RNA precursors transcribed from piRNA clusters. Zucchini (Zuc), a mitochondrial phospholipase D (PLD) superfamily protein is conserved among the animals and involved in piRNA biogenesis. Recent studies showed that the Zucchini is an endoribonuclease essential for primary piRNA maturation and production of phased piRNA in secondary piRNA biogenesis of drosophila germ cell. Based on these reports, here we identified and studied the silkworm Zucchini (BmZuc) at subcellular level in ovary-derived BmN4 cell. The silkworm Zuc specifically expressed in germ-related tissues and localized on mitochondria and partially co-localized with perinuclear nuage-piRNA pathway components and nuage marker protein BmVasa. Molecular dissection analyses revealed that the conserved mitochondrial localization sequence, RGV motif, PLDc 2 domain and HKD motif are important for the BmZuc mitochondrial localization. Moreover, the knockdown analyses showed that the piRNA pathway components are independent on BmZuc for their nuage localization, whereas BmZuc depend on piRNA pathway components for the proper localization. Our data provides vital information on mitochondrial BmZuc and its relationship to “nuage” in ovary-derived BmN4 cell.

DOI： 10.1016/j.bbrc.2017.09.107

Language：English   Publishing type：Research paper (scientific journal)  

p62/Sequestosome-1 (p62/SQSTM1, hereafter referred to as p62) is a major adaptor that allows ubiquitinated proteins to be degraded by autophagy, and Atg8 homologs are required for p62-mediated autophagic degradation, but their relationship is still not understood in Lepidopteran insects. Here it is clearly demonstrated that the silkworm homolog of mammalian p62, Bombyx mori p62 (Bmp62), forms p62 bodies depending on its Phox and Bem1p (PB1) and ubiquitin-associated (UBA) domains. These two domains are associated with Bmp62 binding to ubiquitinated proteins to form the p62 bodies, and the UBA domain is essential for the binding, but Bmp62 still self-associates without the PB1 or UBA domain. The p62 bodies in Bombyx cells are enclosed by BmAtg9-containing membranes and degraded via autophagy. It is revealed that the interaction between the Bmp62 AIM motif and BmAtg8 is critical for the autophagic degradation of the p62 bodies. Intriguingly, we further demonstrate that lipidation of BmAtg8 is required for the Bmp62-mediated complete degradation of p62 bodies by autophagy. Our results should be useful in future studies of the autophagic mechanism in Lepidopteran insects.

DOI： 10.1016/j.ibmb.2017.08.006

Language：English   Publishing type：Research paper (scientific journal)  

PIWI-interacting RNAs (piRNAs) are a class of endogenous small non-coding RNAs, which are mostly 24–32 nucleotides in length and interact specifically with PIWI subfamily of argonaute proteins. Despite the significant research progress in germ line piRNA pathway, its role in somatic cell is not well known. In Drosophila ovarian somatic cell, maturation of primary piRNA and its loading onto Piwi occurs at perinuclear Yb body. The Armitage (Armi) and Yb proteins are the major components of Yb body and specially expressed in ovarian somatic cell. Based on the reports, here we studied the BmArmi and BmYb in Bombyx mori ovary-derived BmN4 cells expressing BmVasa. In this study, we show that BmArmi and BmYb co-localized with BmVasa at nuage. The helicase domains of BmArmi and BmYb are important for nuage localization. Moreover, RNAi of piRNA components reveal that BmArmi depend on BmAgo3 for nuage localization, and BmArmi and BmYb form cytoplasmic granules independently in the absence of BmVasa. Our results provide evidence that the BmArmi and BmYb coexist with BmVasa and play an important role in perinuclear nuage granules formation in ovary-derived BmN4 cell.

DOI： 10.1016/j.bbrc.2017.06.008

Language：English   Publishing type：Research paper (scientific journal)  

The kinetochore creates chromosomal attachment sites for microtubules. The kinetochore-microtubule interface plays an important role in ensuring accurate transmission of genetic information to daughter cells. Bombyx mori is known to possess holocentric chromosomes, where spindle microtubules attach along the entire length of the chromosome. Recent evidence suggests that CENP-A and CENP-C, which are essential for centromere structure and function in other species, have lost in holocentric insects, implying that B. mori is able to build its kinetochore regardless of the lack of CENP-A and CENP-C. Here we report the identification of three outer kinetochore genes in the silkworm B. mori by using bioinformatics and RNA interference-based screening. While the homologs of Ndc80 and Mis12 have strong similarity with those of other organisms, the five encoded proteins (BmNuf2, BmSpc24, BmSpc25, BmDsn1 and BmNnf1) are highly diverged from their counterparts in other species. Microscopic studies show that the outer kinetochore protein is distributed along the entire length of the chromosomes, which is a key feature of holocentric chromosomes. We also demonstrate that BmDsn1 forms a heterotrimeric complex with BmMis12 and BmNnf1, which acts as a receptor of the Ndc80 complex. In addition, our study suggests that a small-scale RNAi-based candidate screening is a useful approach to identify genes which may be highly divergent among different species.

DOI： 10.1016/j.ibmb.2017.04.005

Language：English   Publishing type：Research paper (scientific journal)  

The role of the alkaline protease (AprA) in pyocyanin production in Pseudomonas aeruginosa was investigated. AprA was overproduced when a plasmid carrying the aprA gene was introduced to an aprA-deletion mutant strain, EG03; thus, aprA-complemented EG03 was used as an overproducing strain. The complemented strain produced higher pyocyanin than the mutant strain in all commercially available media evaluated. Particularly, pyocyanin production was higher in the complemented than in the parental strain in brain-heart infusion and tryptic soy broths. These results suggested that protein degradation products by AprA were utilized for pyocyanin production. Protein-rich media were used in subsequent validation studies. Similar results were obtained when the basal medium was supplemented with casein or skim milk as the sole organic nitrogen source. However, gelatin failed to induce abundant pyocyanin production in the complemented strain, despite the presence of protein degradation products by AprA as assessed by SDS-PAGE. Thus, gelatin degradation products may not be suitable for pyocyanin synthesis. In conclusion, AprA could contribute to pyocyanin production in the presence of several proteins or peptides.

DOI： 10.1093/femsle/fnx051

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.toxicon.2016.11.245

Language：English   Publishing type：Research paper (scientific journal)  

Recent advances in bacterial characterization methodologies have made taxonomic categorization significantly more accurate. Here, we re-evaluated the position of bacterial strains (532 and 652) belonging to the genus Hafnia, isolated from flacherie-diseased silkworms in 1965. Phylogenetic analysis based on the 16S rRNA gene sequences of these strains suggests that they belong to genus Enterobacter. Using multilocus sequence analysis (MLSA), these strains were further classified to MLSA group A, which is a “core” group of Enterobacter containing E. cloacae (the type species of the genus). Although these strains were closely related to E. mori, E. tabaci, and E. asburiae, they also had other MLSA characteristics that distinguished them from these neighboring bacterial species. These data were supported by further biochemical analysis. Thus, it appears that the 532 and 652 strains isolated almost half a century ago belong to genus Enterobacter, and their unique characteristics strongly suggest that they are a novel bacterial species.

DOI： 10.11416/jibs.86.2_035

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Biogenic amines are common biologically active substances extended within the whole animal kingdom where they play vital roles as signal transducer as well as regulator of cell functions. One of these biogenic amines called octopamine (OA) is synthesized from tyramine (TA) by the catalysis of tyramine-β-hydroxylase (TβH) originated in the insect nervous system. Both TA and OA act as neurotransmitters, neurohormones and neuromodulators in the arthropod nervous system. Herein, the inhibitory activity of 1-arylimidazole-2(3H)-thiones (AITs) was tested on cloned Drosophila tyramine-β-hydroxylase (DmTβH) expressed in Bombyx mori strain. Radiolabelled ³H-TA was used to analyze the activity of AITs exhibited inhibitory effects on DmTβH, whose ID₅₀ values range from 0.02 to 2511 nM where DmTβH was inhibited in a dose-dependent manner at pH 7.6 and 25 °C during a 30 min of incubation. To understand the catalytic role of the TβH, a three dimensional structure of the TβH from Drosophila melanogaster was constructed by homology modeling using the Phyre2 web server with 100% confidence. The modeled three-dimensional structure of TβH was used to perform the docking study with AITs. This may give more insights to precise design of inhibitors for TβH to control insect's population.

DOI： 10.1016/j.ijbiomac.2016.06.026

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11416/jibs.85.1_007

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.plasmid.2016.03.001

Language：English   Publishing type：Research paper (scientific journal)  

DNA replication is one of key event in cell-cycle progression, yet due to their importance and lethality, the chronological phenotypes of DNA synthesis machineries after the depletion of corresponding genes have proved difficult to study. In the present study, mRNAs for three DNA polymerases, a clamp, and three clamp loaders were gradually depleted from cultured silkworm cells by soaking RNAi. Interestingly, the depletion of these DNA synthesis factors had different effects on the cell growth rate and arrest of cell-cycle progression during time-lapse observation. The depletion of DNA polymerases immediately arrested the cell-cycle progression at the S phase, while that of PCNA, a DNA clamp, required more time to slow cell growth and finally induced apoptosis. Surprisingly, silkworm cells continued to undergo several rounds of cell division when the components of clamp loaders were knocked down.

DOI： 10.11416/jibs.85.2_021

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/srep18103

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s12257-014-0806-x

Language：English  

DOI： 10.1016/j.ibmb.2015.01.008

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ibmb.2015.01.008

Language：English  

DOI： 10.1016/j.ibmb.2014.10.001

Language：English  

DOI： 10.1016/j.febslet.2014.09.009

Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

DOI： 10.1016/j.ibmb.2014.05.008

Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

DOI： 10.1080/09168451.2014.905188

Language：English  

Language：English  

DOI： 10.1111/imb.12072

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s12033-013-9694-0

Language：English  

DOI： 10.1371/journal.pone.0092313

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00253-013-5279-x

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ibmb.2013.04.004

Language：English  

DOI： 10.1095/biolreprod.112.107292

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/arch.21091

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/imb.12023

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/1744-7917.12031

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11416/jibs.82.1_001

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11416/jibs.82.1_019

Language：English   Publishing type：Research paper (scientific journal)  

DOI： http://dx.doi.org/10.1016/j.aspen.2012.06.004

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (bulletin of university, research institution)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (bulletin of university, research institution)  

Repository Public URL： http://hdl.handle.net/2324/16121

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

Language：English  

DOI： 10.1111/j.1365-2583.2004.00553.x

Language：English  

DOI： 10.1016/j.femsle.2005.01.032

Language：English  

DOI： 10.1080/10425170400028871

Language：English  

DOI： 10.1016/j.cbpc.2004.06.013

Language：English  

Language：English  

DOI： 10.1016/j.cbpc.2004.06.004

Language：Others  

Language：English  

Language：Others  

Language：Others  

Event date： 2023.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2023.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2023.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2022.11 - 2022.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：幕張メッセ   Country：Japan  

Event date： 2022.11 - 2022.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：幕張メッセ   Country：Japan  

Event date： 2022.11 - 2022.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：幕張メッセ   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-yamaguchi92/

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-yamaguchi92/

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-tsukuba91

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-tsukuba91

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-tsukuba91

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-tsukuba91

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-tsukuba91

Event date： 2018.11

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神奈川   Country：Japan  

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八丈島   Country：Japan  

Event date： 2018.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：山口大学   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農工大学   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2017.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Event date： 2017.2 - 2017.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Bangkok   Country：Thailand  

Event date： 2016.3

Language：English   Presentation type：Oral presentation (general)  

Venue：京京都工芸繊維大学（京都市左京区）   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京京都工芸繊維大学（京都市左京区）   Country：Japan  

Event date： 2015.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2015.12

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2015.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：神戸ポートアイランド   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学大学院農学研究院（北海道札幌市）   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学大学院農学研究院（北海道札幌市）   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学大学院農学研究院（北海道札幌市）   Country：Japan  

Event date： 2015.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona Spain   Country：Spain  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Haeundae Grand Hotel, Busan   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2015.4

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyungpook National University, Daegu   Country：Korea, Republic of  

Event date： 2014.11

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：パシフィコ横浜   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：パシフィコ横浜   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：パシフィコ横浜   Country：Japan  

Event date： 2014.3

Language：English   Presentation type：Oral presentation (general)  

Venue：日本大学生物資源科学部（藤沢)   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学生物資源科学部（藤沢)   Country：Japan  

Event date： 2013.5

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：大韓民国平昌郡   Country：Korea, Republic of  

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2011.3

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Molecular characterization of the Fanconi anemia protein FancM in silkworm, Bombyx mori

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Molecular cloning and function analysis of silkworm Dicer-2 homolog gene,

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Participation of the endoplasmic reticula chaperons in regulation of protein secretion in BES

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Silkworm Argonaute2 homolog is involved in exso-siRNA and endo-siRNA pathway

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Identification and Expression Pattern Analysis of Polycomb Group Genes in the Silkworm, Bombyx mori,

Event date： 2010.12

Presentation type：Symposium, workshop panel (public)  

Venue：神戸   Country：Japan  

Analysis of transcriptional repression by silkworm Piwi proteins

Event date： 2010.8

Presentation type：Oral presentation (general)  

Venue：Boston, USA   Country：United States  

Event date： 2010.4

Presentation type：Oral presentation (general)  

Venue：信州   Country：Japan  

Event date： 2010.4

Presentation type：Oral presentation (general)  

Venue：信州   Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.12

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.9

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.9

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.3

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.3

Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2009.3

Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2009.3

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催   Country：Japan  

Other Link： https://sites.google.com/view/jsss-yamaguchi92/

Venue：福岡   Country：Japan  

Venue：福岡   Country：Japan  

Venue：Suwon   Country：Korea, Republic of  

Venue：横浜   Country：Japan  

Venue：横浜   Country：Japan  

Venue：東京   Country：Japan  

Venue：京都   Country：Japan  

Venue：Tsukuba   Country：Japan  

Venue：神戸   Country：Japan  

Venue：福岡   Country：Japan  

Venue：福岡   Country：Japan  

Venue：福岡   Country：Japan  

Venue：福岡   Country：Japan  

Venue：福岡   Country：Japan  

Venue：神戸   Country：Japan  

Venue：神戸   Country：Japan  

Venue：神戸   Country：Japan  

Venue：東京   Country：Japan  

Venue：Kyoto   Country：Japan  

Venue：Kyoto   Country：Japan  

Venue：Kyoto   Country：Japan  

Venue：Kyoto   Country：Japan  

Venue：Kyoto   Country：Japan  

Venue：Crete   Country：Greece  

Venue：Crete   Country：Greece  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Venue：Sangju   Country：Korea, Republic of  

Language：Japanese  

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop

Audience：Infants,　Schoolchildren,　Junior students,　High school students

Type：Seminar, workshop