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Mechanisms and roles of degradation of organelles by selective autophagy

Research Project

Project/Area Number 20K06552
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43030:Functional biochemistry-related
Research InstitutionNiigata University

Principal Investigator

Fukuda Tomoyuki  新潟大学, 医歯学系, 准教授 (90415282)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsオートファジー / オルガネラ / ミトコンドリア / タンパク質分解 / 酵母 / シグナル伝達 / マイトファジー / 分裂酵母
Outline of Research at the Start

選択的オートファジーはオルガネラの一部を膜で包み、輸送、分解することで、オルガネラの質や量を制御する。この際に、分解対象をどのように認識し、切り離すかは不明である。また、選択的オートファジーがオルガネラ機能や細胞活動に寄与する程度や、機序も分かっていない。そこで本研究は、選択的オートファジーに関わる因子の探索と機能解析から「選択的オートファジーによるオルガネラ分解の機構」の解明を目指す。また、各因子の欠損株の表現型解析から「オルガネラ分解の生理的意義」を見出す。

Outline of Final Research Achievements

Mitophagy is a selective type of autophagy in which unnecessary mitochondria are sequestered by phagophores and degraded. A comprehensive screen in fission yeast has identified Atg43 and Atg44 to be essential for mitophagy.
Atg43 is a mitochondrial outer membrane (MOM) protein. Atg43 binds to Atg8, a phagophore membrane-associated protein. Artificial tethering of Atg8 to the MOM can compensate for the lack of Atg43. Thus, Atg43 stabilizes phagophores on mitochondria by binding to Atg8. Atg44 resides in the mitochondrial intermembrane space. Loss of Atg44 causes abnormal mitochondrial morphology, while its overexpression resulted in mitochondrial fragmentation. Thus, Atg44 likely promotes mitochondrial fission that separates a part of mitochondria for phagophore engulfment. Indeed, artificial fragmentation of mitochondria can compensate for the lack of Atg44.
Taken together, Atg43-mdiated phagophore recruitment and Atg44-driven mitochondrial fission are two key processes in mitophagy.

Academic Significance and Societal Importance of the Research Achievements

マイトファジーは真核生物に普遍的に見られ、細胞の恒常性維持や機能発現に重要な役割を果たすと考えられている。本研究では、酵母を用いた探索からマイトファジーに必須の因子を同定し、それぞれの作用機序を明らかにした。特に、マイトファジーには、ミトコンドリアに隔離膜をリクルートする過程と、分解対象のミトコンドリア領域を分裂させて隔離膜に収納する過程が存在することを分子レベルで明確にできた。本研究成果を足がかりに、マイトファジーの制御機構や生理機能の理解が進むと期待できる。また、マイトファジーの人為操作によるミトコンドリア機能の人工的制御につながる可能性がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (13 results)

All 2022 2021 2020

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] 栄養飢餓に応じてTORC1の活性を制御する仕組み2022

    • Author(s)
      福田智行
    • Journal Title

      化学と生物

      Volume: 60 Pages: 550-552

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Multiplexed suppression of TOR complex 1 induces autophagy during starvation2021

    • Author(s)
      Fukuda Tomoyuki、Shiozaki Kazuhiro
    • Journal Title

      Autophagy

      Volume: 17 Issue: 7 Pages: 1794-1795

    • DOI

      10.1080/15548627.2021.1938915

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Membrane perturbation by lipidated Atg8 underlies autophagosome biogenesis2021

    • Author(s)
      Maruyama Tatsuro、Alam Jahangir Md.、Fukuda Tomoyuki、Kageyama Shun、Kirisako Hiromi、Ishii Yuki、Shimada Ichio、Ohsumi Yoshinori、Komatsu Masaaki、Kanki Tomotake、Nakatogawa Hitoshi、Noda Nobuo N.
    • Journal Title

      Nature Structural & Molecular Biology

      Volume: 28 Issue: 7 Pages: 583-593

    • DOI

      10.1038/s41594-021-00614-5

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atg43, a novel autophagy-related protein, serves as a mitophagy receptor to bridge mitochondria with phagophores in fission yeast2021

    • Author(s)
      Fukuda Tomoyuki、Kanki Tomotake
    • Journal Title

      Autophagy

      Volume: 17 Issue: 3 Pages: 826-827

    • DOI

      10.1080/15548627.2021.1874662

    • Related Report
      2020 Research-status Report
  • [Journal Article] Tripartite suppression of fission yeast TORC1 signaling by the GATOR1-Sea3 complex, the TSC complex, and Gcn2 kinase2021

    • Author(s)
      Fukuda Tomoyuki、Sofyantoro Fajar、Tai Yen Teng、Chia Kim Hou、Matsuda Takato、Murase Takaaki、Morozumi Yuichi、Tatebe Hisashi、Kanki Tomotake、Shiozaki Kazuhiro
    • Journal Title

      eLife

      Volume: 10

    • DOI

      10.7554/elife.60969

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Atg43 tethers isolation membranes to mitochondria to promote starvation-induced mitophagy in fission yeast2020

    • Author(s)
      Fukuda Tomoyuki、Ebi Yuki、Saigusa Tetsu、Furukawa Kentaro、Yamashita Shun-ichi、Inoue Keiichi、Kobayashi Daiki、Yoshida Yutaka、Kanki Tomotake
    • Journal Title

      eLife

      Volume: 9

    • DOI

      10.7554/elife.61245

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 選択的オートファジーを誘導するレセプター分子の作用機序2022

    • Author(s)
      福田智行、古川健太郎、山下俊一、神吉智丈
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 分裂酵母におけるマイトファジーの機構解明2022

    • Author(s)
      福田智行
    • Organizer
      第11回TOR研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Mechanisms and roles of receptor-mediated mitophagy in fission yeast2022

    • Author(s)
      福田智行、神吉智丈
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Atg43 serves as a selective autophagy receptor to promote mitophagy2021

    • Author(s)
      Tomoyuki Fukuda
    • Organizer
      pombe Talks
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 分裂酵母TORC1制御の普遍性と多様性2021

    • Author(s)
      福田智行
    • Organizer
      第11回TOR研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Gcn2経路はアミノ酸飢餓に応答してTORC1を制御し、オートファジーを促進する2021

    • Author(s)
      福田智行、塩﨑一裕、神吉智丈
    • Organizer
      酵母遺伝学フォーラム第54回研究報告会
    • Related Report
      2021 Research-status Report
  • [Presentation] 分裂酵母Atg43はマイトファジーレセプターとして機能する2020

    • Author(s)
      福田智行、海老優樹、三枝徹、古川健太郎、神吉智丈
    • Organizer
      酵母遺伝学フォーラム第53回研究報告会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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