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Functional Analysis of multidrug efflux pumps in Streptococcus pneumonaie

Research Project

Project/Area Number 21K20759
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0803:Pathology, infection/immunology, and related fields
Research InstitutionOsaka University

Principal Investigator

TAGUCHI Atsushi  大阪大学, 産業科学研究所, 助教 (20908686)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords肺炎球菌 / 薬剤耐性 / 薬剤排出ポンプ / 膜輸送体 / ABCトランスポーター / ABC型トランスポーター / 薬剤耐性菌 / 多剤排出ポンプ
Outline of Research at the Start

薬剤耐性菌感染症の増加は公衆衛生への脅威であり、多剤耐性化機構の解明は新たな抗菌剤の開発において必要不可欠である。多剤排出ポンプによる細胞外への薬剤輸送はグラム陰性菌の多剤耐性化に直接寄与することが広く知られているが、病原性が高い肺炎球菌を含めたグラム陽性菌の排出ポンプの役割については研究が進められていない。本研究では肺炎球菌の薬剤耐性に関連するポンプ因子を同定し、その機能解析を行うことでグラム陽性菌の多剤排出ポンプ阻害剤の開発、および阻害剤を用いた耐性菌感染症の治療戦略の創造を目指す。

Outline of Final Research Achievements

In this study I constructed an efflux pump overexpression library in Streptococcus pneumoniae and tested this library against a variety of antimicrobial compounds to identify efflux pumps that are directly involved in antibiotic resistance. We identified several of these pumps of which one efflux pump turned out to be a previously uncharacterized ABC transporter. I purified this transporter to biochemically examine its activity and succeeded in measuring ATPase activity in vitro. I plan to structurally characterize this transporter in order to elucidate the mechanism of substrate transport.

Academic Significance and Societal Importance of the Research Achievements

肺炎球菌は先進国の死因の中核を占める肺炎の原因菌として広く認知されており、近年多剤耐性を持った肺炎球菌の蔓延が臨床現場において大きな問題となっている。多剤耐性肺炎球菌感染症に対する治療法を確立させるためには薬剤耐性機構の解明及ひ新規抗菌剤の標的の発見が喫緊の課題となっている。今回の研究は肺炎球菌の膜輸送体がどのように抗菌薬耐性に関与しているかを解明しており、本研究成果は革新的な感染症治療法の開発に応用できることが期待できる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Masters of Misdirection: Peptidoglycan Glycosidases in Bacterial Growth2023

    • Author(s)
      Weaver Anna、Taguchi Atsushi、Dorr Tobias
    • Journal Title

      Journal of Bacteriology

      Volume: 205 Issue: 3

    • DOI

      10.1128/jb.00428-22

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Pyruvate kinase mediates fosfomycin resistance in Streptococcus pneumoniae2023

    • Author(s)
      田口厚志
    • Organizer
      第96回日本細菌学会総会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Pyruvate kinase mediates fosfomycin resistance in Streptococcus pneumoniae2022

    • Author(s)
      Atsushi Taguchi
    • Organizer
      Molecular Genetics of Bacteria and Phage Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pyruvate kinase mediates fosfomycin resistance in Streptococcus pneumoniae2022

    • Author(s)
      Atsushi Taguchi
    • Organizer
      Gordon Conference Streptococcal Biology
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pyruvate kinase mediates fosfomycin resistance in Streptococcus pneumoniae2022

    • Author(s)
      Atsushi Taguchi
    • Organizer
      第15回日韓国際微生物学会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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Published: 2021-10-22   Modified: 2024-01-30  

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