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1999 Fiscal Year Final Research Report Summary

Molecular Mechanisms of Insect Immunity

Research Project

Project/Area Number 09660092
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 応用微生物学・応用生物化学
Research InstitutionTottori University

Principal Investigator

MORISHIMA Isao  Faculty of Agriculture, Tottori University, Professor, 農学部, 教授 (30032296)

Co-Investigator(Kenkyū-buntansha) YAMANO Yoshiaki  Faculty of Agriculture, Tottori University, Associate Professor, 農学部, 助教授 (00182593)
Project Period (FY) 1997 – 1999
Keywordsantibacterial protein / cecropin / lysozyme / attacin / peptidoglycan / insect immunity / silkworm / Eri-silkworm
Research Abstract

(1)Minimum structure of peptidoglycan required for the induction of antibacterial proteins.
Peptidoglycan fragments which differ in their peptide bridge structure or the chain length were prepared and tested for the inducing ability of antibacterial activity in the silkworm, Bombyx mori. The results indicated the silkworm recognized some definite structure of peptidoglycan, and the minimum structure was determined.
(2)Isolation and characterization of peptidoglycan recognition protein.
A peptidoglycan binding protein was isolated from immunized hemolymph of the silkworm larvae. The protein had a molecular weight of 37kd, and the N-terminal amino acid sequence so far determined had no homology to known proteins. The binding specificities and other characteristics of the protein showed the protein was the most possible for the candidate of the peptidoglycan recognition protein involved in the induction of antibacterial protein genes.
(3)Signal transduction system involved in the induction of … More antibacterial protein genes.
Testing various inhibitors of the signal transduction for the effect on the induction of antibacterial genes by peptidoglycan, eicosanoids were found to be involved in the induction of the genes.
(4)Cloning and analysis of the promoter of cecropin genes.
Two cecropin A gene were cloned by screening the silkworm genome. A NF-κB binding motif was found in the promoter region of the two genes. The protein which specifically bound to the motif was detected only in the nuclear extract from immunized fat body.
(5)Detection and cloning of the gene induced by bacterial infection in the Eri-silkworm.
By means of differential display method, several bacteria-induced genes including cecropin and lysozyme were isolated from immunized fat body of the Eri-silkworm, Samia cynthia ricini.
(6)Protein isolation and cloning of attacin cDNA from Eri-silkworm.
Attacin, an antibacterial protein, was isolated from immunized hemolymph of the Eri-silkworm. The DNA fragment synthesized according to the N-terminal amino acid sequence of attacin was used as a probe, and the cDNA was cloned and sequenced. The sequence had high homology to the attacin from cecropia silkmoth. Less

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Morishima, I.: "Eicosanoids mediate induction of immune genes in the fat body of the silkworm, Bombyx mori"FEBS Lett.. 419. 83-86 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamano, Y.: "Structure of genes for cecropin A and an inducible nuclear protein that binds to the promoter region of the genes from the silkworm, Bombyx mori"Biosci. Biotech. Biochem.. 62. 237-241 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iketani, M.: "Minimum structure of peptidoglycan required for induction of antibacterial protein synthesis in the silkworm, Bombyx mori"Insect Biochem. Molec. Biol.. 29. 19-24 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishima, I.: "Techniques in Insect Immunology"SOS Publishers, Fair Haven, NJ., USA.. 304 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishima,I., Yamano,Y., Inoue,K. and Matsuo,N.: "Eicosanoids mediate induction of immune genes ins the fat body of the silkworm, Bombyx mori"FEBS Lett.. 419. 83-86 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamano,Y., Matsumoto,M., Sasahara,K., Sakamoto,E. and Morishima,I.: "Structure of genes for cecropin A and an inducible nuclear protein that binds to the promoter region of the genes from the silkworm, Bombyx mori"Biosci. Biotech. Biochem.. 62. 237-241 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iketani M., Nishimura H., Akayama K., Yamano Y. and Morishima,I: "Minimum structure of peptidoglycan required for induction of antibacterial protein synthesis in the silkworm, Bombyx mori"Insect Biochem. Molec. Biol.. 19-24 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morishima,I.: "Cecropin and lysozyme induction by peptidoglycan fragments in cultured fat body from Bombyx mori. In Techniques in Insect Immunology (Weisner A., Sugumaran M., Marmaras VJ., Morishima I. and Yamakawa M. eds)"SOS Publications, Fair Haven NJ. 59-64 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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