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Elucidating mechanisms by which high levels of ATP prevent accumulation of aberrant protein aggregation

Research Project

Project/Area Number 19K06654
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionGunma University

Principal Investigator

Takaine Masakatsu  群馬大学, 未来先端研究機構, 助教 (20573215)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
KeywordsATP / エネルギー代謝 / 酵母 / バイオセンサー / AMPK / アデニレートキナーゼ / 恒常性 / タンパク質凝集 / 神経変性疾患 / プリン / ホメオスタシス
Outline of Research at the Start

これまでに申請者は「生命のエネルギー通貨」であるATPが、細胞内で常に高濃度に保たれること(ATP恒常性)、またATP動態異常が異常タンパク質の蓄積を惹起するのを発見した。しかしその詳細や生理的意義は不明であった。そこで本研究ではATPによりタンパク質品質管理機構が制御される分子機構の解明を目指す。
多くの神経変性疾患ではタンパク質恒常性の破綻による変性タンパク質の蓄積やエネルギー代謝活性の低下が発症要因になる。本研究によりATP恒常性の破綻がタンパク質恒常性の破綻に帰結する分子機序が明らかになれば、神経変性疾患の発症機構の解明や治療薬の創発にも繋がると期待される。

Outline of Final Research Achievements

Cells use a chemical called adenosine triphosphate (ATP) as a controllable source of energy. Like a battery, each ATP contains a specific amount of energy that can be released when needed. Cells just need enough ATP to survive, but most cells store a lot more than they need. It is unclear why cells keep so much ATP, or whether this excess ATP has any other purpose.
To answer these questions, we identified mutants of the yeast Saccharomyces cerevisiae that had low levels of ATP and examined these cells. In S. cerevisiae cells with lower and changeable levels of ATP, proteins stick together, forming clumps. When they clump together, they stop working and can cause cells to die. Further experiments showed that reducing the levels of ATP just for a short time increased the rate at which proteins stick together.
Taken together, these results suggest that ATP plays a role in stopping proteins from sticking together, explaining why cells may store excess ATP, since it could aid survival.

Academic Significance and Societal Importance of the Research Achievements

本研究は細胞内ATP濃度が一過的にでも低下してしまうと、タンパク質の異常な凝集体形成を誘導する可能性があるため、細胞は常に高濃度のATPを保とうとする、というATPのエネルギー以外の役割を初めて示した。アルツハイマー病等の神経変性疾患を初めとした多くの疾患では、タンパク質の異常な凝集体が毒性を発揮して発症要因になる。本研究で示した、ATP恒常性の破綻による細胞内ATP濃度の変動は、これらのタンパク質凝集体が誘導する疾患の発症機序の一端を説明する可能性がある。このためATP恒常性の仕組みを追求することは、細胞内での異常なタンパク質凝集体形成を抑制する薬の開発に繋がると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019

All Journal Article (6 results) (of which Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (6 results) (of which Invited: 2 results)

  • [Journal Article] High and stable ATP levels prevent aberrant intracellular protein aggregation in yeast2022

    • Author(s)
      Takaine Masak、Imamura Hiromi、Yoshida Satoshi
    • Journal Title

      eLife

      Volume: 11

    • DOI

      10.7554/elife.67659

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cell cycle-dependent phosphorylation of IQGAP is involved in assembly and stability of the contractile ring in fission yeast2021

    • Author(s)
      Morita Rikuri、Numata Osamu、Nakano Kentaro、Takaine Masak
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 534 Pages: 1026-1032

    • DOI

      10.1016/j.bbrc.2020.10.043

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A stalled-ribosome rescue factor Pth3 is required for mitochondrial translation against antibiotics in Saccharomyces cerevisiae2021

    • Author(s)
      Hoshino Soichiro、Kanemura Ryohei、Kurita Daisuke、Soutome Yukihiro、Himeno Hyouta、Takaine Masak、Watanabe Masakatsu、Nameki Nobukazu
    • Journal Title

      Communications Biology

      Volume: 4 Issue: 1 Pages: 300-300

    • DOI

      10.1038/s42003-021-01835-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] QUEEN-based Spatiotemporal ATP Imaging in Budding and Fission Yeast2019

    • Author(s)
      Takaine Masak
    • Journal Title

      BIO-PROTOCOL

      Volume: 9 Issue: 15 Pages: 1-16

    • DOI

      10.21769/bioprotoc.3320

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] AMP-activated protein kinase and adenylate kinase prevent the ATP catastrophe and cytotoxic protein aggregation2019

    • Author(s)
      Takaine Masak、Imamura Hiromi、Yoshida Satoshi
    • Journal Title

      bioRxiv

      Volume: none

    • DOI

      10.1101/801738

    • Related Report
      2019 Research-status Report
  • [Journal Article] Reliable imaging of ATP in living budding and fission yeast2019

    • Author(s)
      Takaine M, Ueno M, Kitamura K, Imamura H, Yoshida S.
    • Journal Title

      J Cell Sci.

      Volume: 132 Issue: 8 Pages: 1-11

    • DOI

      10.1242/jcs.230649

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 出芽酵母Ade4の細胞内顆粒が形成されるメカニズムの解明2021

    • Author(s)
      高稲 正勝
    • Organizer
      酵母遺伝学フォーラム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 細胞内ATP濃度と細胞死の関係2021

    • Author(s)
      高稲正勝
    • Organizer
      日本農芸化学 2021年度 仙台大会(オンライン)
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] TOR複合体活性により酵母Ade4の細胞内顆粒が形成されるメカニズムと生理的意義の解明2020

    • Author(s)
      高稲正勝, 森田陸離
    • Organizer
      第53回酵母遺伝学フォーラム(オンライン)
    • Related Report
      2020 Research-status Report
  • [Presentation] TOR複合体活性により酵母Ade4の細胞内顆粒が形成されるメカニズムと生理的意義の解明2020

    • Author(s)
      高稲正勝, 森田陸離
    • Organizer
      第10回TOR研究会(オンライン)
    • Related Report
      2020 Research-status Report
  • [Presentation] 出芽酵母および分裂酵母の生細胞内におけるATP動態高精度観測系の確立2019

    • Author(s)
      高稲正勝
    • Organizer
      NBRP公開シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] TOR複合体活性により酵母Ade4の細胞内顆粒が形成されるメカニズムの解明2019

    • Author(s)
      高稲正勝
    • Organizer
      第9回TOR研究会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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