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Molecular mechanism of mitochondria autophagy(Fostering Joint International Research)

Research Project

Project/Area Number 15KK0253
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Cell biology
Research InstitutionNiigata University

Principal Investigator

KANKI TOMOTAKE  新潟大学, 医歯学系, 教授 (50398088)

Research Collaborator Klionsky Daniel  University of Michigan, Life Sciences Institute, 教授
Project Period (FY) 2016 – 2018
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Keywordsオートファジー / ミトコンドリア / 酵母 / Atg32 / 生体分子
Outline of Final Research Achievements

Mitophagy plays an important role in mitochondrial quality control. In yeast, phosphorylation of the mitophagy receptor Atg32 by CK2 upon induction of mitophagy is a prerequisite for interaction of Atg32 with Atg11 and following delivery of mitochondria to the vacuole for degradation. Because CK2 is constitutively active, Atg32 phosphorylation must be precisely regulated to prevent unrequired mitophagy. We found that the PP2A (protein phosphatase 2A)-like protein phosphatase Ppg1 was essential for dephosphorylation of Atg32 and thus inhibited mitophagy. We identified the Far complex consisting of Far3-7-8-9-10-11 proteins as Ppg1-binding proteins. Deletion of Ppg1 or Far proteins accelerated mitophagy. Therefore, Ppg1 and the Far complex cooperatively dephosphorylate Atg32 to prevent excessive mitophagy.

Academic Significance and Societal Importance of the Research Achievements

マイトファジーは、オートファジーが選択的にミトコンドリアを分解する現象であり、ミトコンドリアの恒常性維持にも重要な役割を持っていると考えられている。このため、ミトコンドリアが関与する種々の疾患や老化現象を理解するためにも、マイトファジーの理解は重要である。本研究では、酵母におけるマイトファジーを負に制御する機構を世界に先駆けて解明した。こうした研究を哺乳類にまで発展させることができれば、ミトコンドリア関連疾患や老化に対する予防・治療法の開発などに結びついていくと期待される。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2018 2017 Other

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

  • [Int'l Joint Research] University of Michigan Life Sciences Institute(米国)2017

    • Year and Date
      2017-01-31
    • Related Report
      2018 Annual Research Report
  • [Journal Article] The PP2A-like protein phosphatase Ppg1 and the Far complex cooperatively counteract CK2-mediated phosphorylation of Atg32 to inhibit mitophagy.2018

    • Author(s)
      Furukawa K, Fukuda T, Yamashita SI, Saigusa T, Kurihara Y, Yoshida Y, Kirisako H, Nakatogawa H, Kanki T.
    • Journal Title

      Cell Reports

      Volume: 23(12) Issue: 12 Pages: 3579-3590

    • DOI

      10.1016/j.celrep.2018.05.064

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detection of Iron Depletion- and Hypoxia-Induced Mitophagy in Mammalian Cells2018

    • Author(s)
      Yamashita Shun-ichi、Kanki Tomotake
    • Journal Title

      Methods in Molecular Biology, Mitochondrial Bioenergetics

      Volume: 1782 Pages: 315-324

    • DOI

      10.1007/978-1-4939-7831-1_18

    • ISBN
      9781493978304, 9781493978311
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cdc14 Phosphatase Promotes TORC1-Regulated Autophagy in Yeast2018

    • Author(s)
      Kondo Akihiro、Mostofa Md. Golam、Miyake Katsuya、Terasawa Mashu、Nafisa Islam、Yeasmin Akter M.S.T.、Waliullah Talukdar Muhammad、Kanki Tomotake、Ushimaru Takashi
    • Journal Title

      Journal of Molecular Biology

      Volume: 印刷中 Issue: 11 Pages: 1671-1684

    • DOI

      10.1016/j.jmb.2018.04.007

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] How autophagy eats large mitochondria; autophagosome formation coupled with mitochondrial fragmentation2017

    • Author(s)
      Shun-ichi Yamashita and Tomotake Kanki
    • Journal Title

      Autophagy

      Volume: 印刷中 Issue: 5 Pages: 980-981

    • DOI

      10.1080/15548627.2017.1291113

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 環境温度変化に応答した脂肪組織におけるミトコンドリア分解2018

    • Author(s)
      山下 俊一、神吉 智丈
    • Organizer
      BIOTHERMOLOGY WORKSHOP
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] ミトコンドリアオートファジーの制御機構2018

    • Author(s)
      古川 健太郎、神吉 智丈
    • Organizer
      第51回酵母遺伝学フォーラム
    • Related Report
      2018 Annual Research Report
  • [Presentation] 出芽酵母におけるミトコンドリア オートファジーの分子機構2017

    • Author(s)
      神吉智丈
    • Organizer
      日本植物学会第81回大会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] ミトコンドリア分解を制御するリン酸化2017

    • Author(s)
      神吉智丈
    • Organizer
      ConBio2017(2017 年度 生命科学系学会合同年次大会)
    • Related Report
      2017 Research-status Report
  • [Remarks] 新潟大学大学院医歯学総合研究科機能制御学分野

    • URL

      https://www.med.niigata-u.ac.jp/mit/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 新潟大学大学院医歯学総合研究科  機能制御学分野

    • URL

      http://www.med.niigata-u.ac.jp/mit/

    • Related Report
      2017 Research-status Report 2016 Research-status Report

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Published: 2016-10-04   Modified: 2022-12-28  

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