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Elucidation of the virulence factor transport mechanism of Entamoeba histolytica based on the retromer complex

Research Project

Project/Area Number 21K15426
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49040:Parasitology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Watanabe Natsuki  東京大学, 大学院医学系研究科(医学部), 特任研究員 (00883323)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords赤痢アメーバ / レトロマー / Vps35 / 小胞輸送 / Retreomer / Vps / membrane traffic / phagocytosis / リソソーム
Outline of Research at the Start

一般にレトロマー(複合体)はプロテアーゼ輸送体と結合しエンドソーム-ゴルジ体間の輸送を制御する。コアタンパク質(Vps26, 29, 35)により形成され、SNX [PX domain (リン脂質結合)]とRab7 (small GTPase)との相互作用により、上記機構の制御を行う。赤痢アメーバ原虫においては病原機構の中核を担う。赤痢アメーバではコアタンパク質が多様化[Vps26×6, Vps35×5]している。この多様性は他種生物でも未解明である。本研究では、赤痢アメーバのレトロマー構成因子、新規結合タンパク質の機能解明、レトロマー全体としての構造、機能制御、病原機構を明らかにする。

Outline of Final Research Achievements

This study, which aims to elucidate the functions of retromer constituents that have diversified in Entamoeba histolytica, has clarified several constituent-factor-specific functions. Notably, Vps35-1 regulates the recruitment of retromers to phagocytic vesicles, and Vps35-2 regulates the activity of secreted cysteine proteases, which are virulence factors. is. In addition, each component forms a different retromeric core complex, and the different core complexes form dimers to tetramers. This study revealed the organization of a highly complex complex of retromers and their distinct functions, especially Vps35-1 and Vps35-2.

Academic Significance and Societal Importance of the Research Achievements

レトロマーはパーキンソン病やアルツハイマー病の原因遺伝子であるVps35を含む複合体だが、レトロマー構成因子のisotypeの違いによる役割の違いは未だよく明らかになっていない。本研究により、レトロマー構成因子のそれぞれのisotypeによる異なる働きの一端が明らかとなったことはレトロマーの機能を明らかにするために重要である。
これを軸として、他のisotypeの機能や複合体の形成様式が明らかとなれば、赤痢アメーバのみならず、哺乳類における上記の疾病の原因解明と新規治療方法の発見に繋がことが期待される。

Report

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

    (7 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Molecular dissection of phagocytosis by proteomic analysis in Entamoeba histolytica.2023

    • Author(s)
      Watanabe, M., Nakada-Tsukui, K., Nozaki, T.
    • Journal Title

      Genes (Basel).

      Volume: 14 Issue: 2 Pages: 379-379

    • DOI

      10.3390/genes14020379

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two StAR-related lipid transfer proteins play specific roles in endocytosis, exocytosis, and motility in the parasitic protist Entamoeba histolytica2021

    • Author(s)
      Das Koushik、Watanabe Natsuki、Nozaki Tomoyoshi
    • Journal Title

      PLOS Pathogens

      Volume: 17 Issue: 4 Pages: 1009551-1009551

    • DOI

      10.1371/journal.ppat.1009551

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Diversity of phosphoinositide binding proteins in Entamoeba histolytica2021

    • Author(s)
      Watanabe Natsuki、Nakada-Tsukui Kumiko、Nozaki Tomoyoshi
    • Journal Title

      Parasitology International

      Volume: 83 Pages: 102367-102367

    • DOI

      10.1016/j.parint.2021.102367

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Diversification and isotype-specific functions of the retromer complex in Entamoeba histolytica: Regulation of vesicular trafficking and pathogenesis by isotype switching2023

    • Author(s)
      Natsuki Watanabe, Kumiko Tsukui, Tomoyoshi Nozaki
    • Organizer
      International conference on emerging infectious diseases in the Pacific Rim
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 赤痢アメーバにおいて多様化したレトロマー複合体の構成因子Vps35-1及びVps35-2の機能解析2022

    • Author(s)
      渡邊菜月、津久井久美子、野崎智義
    • Organizer
      日本寄生虫学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Regulation of pathogenesis by diversified retromer complex in Entamoeba histolytica: isotype-specific functions of retromer components in vesicular trafficking2022

    • Author(s)
      Natsuki Wanatabe,
    • Organizer
      molecular parasitology meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 多様化したレトロマー複合体の中心分子Vps29により制御される赤痢アメーバ病原機構の解明2022

    • Author(s)
      渡邊菜月、QUYNH ANH Pham Hong、津久井久美子、野崎智義
    • Organizer
      日本細胞生物学会
    • Related Report
      2022 Annual Research Report

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Published: 2021-04-28   Modified: 2024-01-30  

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