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The significance of Chromosomal Virulence Genes of Shigella flexneri in the Pathogenesis of Bacillary Dysentery

Research Project

Project/Area Number 01440031
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 細菌学
Research InstitutionThe University of Tokyo

Principal Investigator

YOSHIKAWA Masanosuke  The University of Tokyo, The Institute of Medical Science, Professor, 医科学研究所, 教授 (80012714)

Co-Investigator(Kenkyū-buntansha) OKADA Nobuhiko  As above Assistant, 医科学研究所, 助手 (80194364)
FUKUDA Ichiro  As above Assistant, 医科学研究所, 助手 (10242108)
TOBE Toru  As above Assistant, 医科学研究所, 助手 (70207596)
SASAKAWA Chihiro  As above Associate Professor, 医科学研究所, 助教授 (70114494)
Project Period (FY) 1989 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥28,700,000 (Direct Cost: ¥28,700,000)
Fiscal Year 1992: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1991: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1990: ¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1989: ¥10,600,000 (Direct Cost: ¥10,600,000)
KeywordsShigella / virulence / virulence gene / chromosome / chromosome map / dysentery / 細胞間拡散 / 遺伝子調節 / 細胞性赤痢 / 細胞侵入 / NotI切断地図 / トランスポソン / 病原性
Research Abstract

The essential steps leading to dysenteric symptomes by the bacterium Shigella is invasion of colonic epithelial cells, followed by intracellular bacterial multiplication and spread of invading bacteria to adjacent cells. The genetic determinants for the virulence of shigellae are located on the large 230 kb plasmid as well as on the chromosome. Extensive molecular studies have been performed on the plasmid virulence genes by the investigators from many laboratories. We also engaged in such studies in the previous project which resulted in showing that the plasmid encodes virulence-associated functions involved in intracellular invasion, secretion of virulence proteins, intra-and intercellular spreading and regulation of the expression of these plasmid-coded virulence genes. The present project was an extention of these studies aiming to clarify the significance of chromosomal virulence genes in collaboration with the plasmid genes in the pathogenesis of bacillary dysentery. The following are the summary of the results obtained:(1) Avirulent transposon insertion mutants were isolated by random transposon insertion mutagenesis. (2) The virulence-associated phenotypes of these mutants were analysed. (3) A NotI restriction cleavage map of the chromosome was constructed and the above-described mutants were assigned on it. (4) Some of the loci identified by these methods were analysed further genetically and by cellular biological techiques. These virulence-associated regions were found to be involved in either (I) LPS biosynthesis, (II) intracellular multiplication, (III) intercellular spreading, or (IV) regulation of the expression of the virulence genes on the large plasmid. For the regions classified into category (III) or (IV), a detailed analysis was made and the results have already been published as articles or reviews in international journals.

Report

(5 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] C.SASAKAWA: "Functional organization and nucleotide aegucnce of vinilence Region-2 on the large virwence plasmig in shigella flexneri 2a" Mol.Microbiol. 3. 1191-1201 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Okada: "Virulence-associated chromosomal loci of shigella flexneri identified by random Tn5 insertion mutagenesis" Mol.Microbiol.5. 187-195 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tobe: "Temperature regulated expression of invasion genes in Shigella tlexneri is controlled through the transuiptional activation of the virb gene on the large plasmid." Mol.Microbiod.5. 887-893 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Okada: "Construction of a physical map of the chromosome of shigella flexneri 2a and the direct assignment of nine virulence-asseiated loci edentified by Tn5 insertions" Mol.Microviol. 5. 2171-2180 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Nakata: "Identification and cheracterization of virk a virulence-associated lange plasmid gene essential for intercellular spreading of shigella flexneri." Mol.Microbiol. 6. 2387-2395 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tobe: "vacb,a novel chrondsomal gene regulating expression of the virulence genes of the large plasmid of shigella flexneri" J.Bacteriol.174. 6359-6367 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Yoshikawa: "Molecular pathogenesis of shigellosis :A review Microbiol.Immunol." 財団法人学会誌刊行センター, 15 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] C.Sasakawa: "The large plasmid of Shigella Curr.Topics Microbiol.Immunol." P.J.Sansonetti(Springer-Verlag), 23 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] C.Sasakawa et al: "Functional organization and nucleotide sequence of virulence region-2 on the large plasmid in Shigella flexneri 2a" Molec.Microbiol. 3. 1191-1201 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Okada et al: "Virulence-associated chromosomal loci of Shigella flexneri identified by random Tn5 insertion mutagenesis" Molec.Microbiol. 5. 187-195 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tobe et al: "Temperature regulated expression of invasion genes in Shigella flexneri is control- led through the transcriptional activation of the virB gene on the large plamid" Molec.Microbiol. 5. 887-893 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Okada et al: "Construction of a physical map of the chromosome of Shigella flexneri 2a and the direct assignment of nine virulence-associated loci identified by Tn5 insertions" Molec.Microbiol. 5. 2171-2180 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Nakata et al: "Identification and characterization of virK, a virulence-associated large plasmid gene essential for intercellular spreading of Shigella flexneri" Molec.Microbiol. 6. 2387-2395 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Tobe et al: "vacB, a novel chromosomal gene regulating expression of the virulence genes on the large plamid of Shigella flexneri" J.Bacteriol. 174. 6359-6367 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Yoshikawa and C.Sasakawa: Molecular pathogenesis of shigllosis; A review Microbiol. Immunol., 15 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] C.Sasakawa et al: P.J.Sansonetti(Springer-Verlag). The large plamid of Shigella Cuur.Topics Microbiol.Immunol., 23 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Nakata: "Identification ond characteriqation of virk a virulence-associated large plasmid gene essential for intercelluar spreading of Shigella flexnori" Mol. Microbiol.6. 2387-2395 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T. Tobe: "vacB,a novel chromosomal gene requlating expression of the virulence genes on the large plasmid of shigella flexneri" J. Bacteriol. 174. 6359-6367 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C. Sasakawa: "Eight genes in roqion-5 forming on operon are essential for envasion of epitheleol cells by Shegolla flexneri 2a" J. Bacteriol in press.(1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T. Tobe: "Transuiptional control of the envasion regula tory gene,virB,of Shigella flexneri;actiuation by VirF and repression by H-NS" submitted to J. Bacteriol.

    • Related Report
      1992 Annual Research Report
  • [Publications] M. Yoshikawa: "Regulation of Shigella virulence expression.In “molecular mechanisms of Bacterial virulence." C.I Kado and J.Crosa, (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Sasakawa: "The large plasmid of Shigella Curr.Topics Microbiol Immunol" P.J Sansonetti(Springor-Verlag), 23 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Sasakawa: "Functional organi3ation and nucleotide sepuence of virulence Regionー2 on the large virulence plasmid in Shigella fiexneri 2a" Mol.Microbiol.3. 1191-1201 (1989)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.OKada: "Virulenceーassociated chromosomal loci of shigella flexneri identified by random Tn5 insertion mutagensis." Mol.Microbiol.5. 187-195 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Tobe: "Temperatureーregulated expression of invasion genes in Shigella flexneri is controlled through the transuiptional activation of the virB gene on the large plasmid" Mol.Microbiol.5. 887-893 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Okada: "Construction of a physical map of the chromosome of shigella flexneri 2a and the direct assignment of nine virulenceーassocicated loci identified by Tn5 inserions." Mol.Microbiol.5. 2127-2180 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Yoshikawa: "Molecular pathogenesis of shigellosis:A review" Microbiol.Immunol.35. 809-824 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] C.Sasakawa et al.: "Thermoregulation of invasion genes in Shigella flexneri through the transcriptional activation of the virB gene on the large plasmid." Molecular Pathogenesis of Gastrointestinal Infections(ed.T.Wadstrom et al.)Plenum Press., 5 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] C.Sasakawa: "Functional organization and nucleotide sequence of virulence Regionー2 on the large virulence plasmid in Shigella flexneri 2a." Mol.Microbiol.3. 1191-1201 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] N.Okada: "Virulenceーassociated chromosomal loci of Shigella flexneri identified by random Tn5 insertion mutagenesis." Mol.Microbiol.5. 187-195 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Tobe: "Temperatureーregulated expression of invasion genes in Shigella flexneri is controlled" Mol.Microbiol.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] C.Sasakawa: "The large virulence plasmid of Shigella." Car.Topics.Microbiol.Immunol.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] H.Chosa: "Loss of virulence in shigella strains preserved in culture collections due to molecular alteration of the invasion plasmid." Microbial Pathogen.6. 337-342 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] C.Sasakawa: "Functional organization and nucleotide sequence of virulence Region-2 on the large virulence plasmid in Shigella flexneri 2a." Mol.Microbiol. 3. 1191-1201 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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