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Mechanism of cell death induction by the failure of ribosome-associated quality control pathway

Research Project

Project/Area Number 20K06615
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 InstitutionNagoya City University (2022)
Tohoku University (2020-2021)

Principal Investigator

Udagawa Tsuyoshi  名古屋市立大学, 医薬学総合研究院(薬学), 准教授 (20644199)

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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords翻訳 / 品質管理 / リボソーム / タンパク質凝集体 / タンパク質分解 / 神経変性 / 細胞死
Outline of Research at the Start

遺伝子発現の異常は様々な疾患の原因となる。生体にはこれらの異常に対応するための多様な品質管理機構が備わっている。本研究では異常な翻訳停滞により誘導される新生タンパク質品質管理機構RQC (ribosomeassociated quality control)に着目し、この機構の破綻によるタンパク質凝集体形成と細胞死誘導の分子機構を解明する。特に、(1)細胞死誘導のシグナル系の同定、(2)タンパク質凝集体の実体の解明、(3)RQCが機能不全に陥った際の遺伝子発現への影響の解明、に焦点を絞り、これらを明らかにすることで、哺乳類細胞におけるRQC機構の重要性の理解を深める。

Outline of Final Research Achievements

In this study we aimed to elucidate the mechanism of nascent protein degradation and cell death induction by the execution and the failure of ribosome-associated quality control, RQC, pathway which targets the stalled ribosomes on the aberrant mRNAs. Especially we focused on identifying the peptide tag, called CAT-tail, added to the C-terminal end of the aberrant nascent peptides and elucidated its impact on the nascent peptide degradation and its potential toxic effect when accumulated in mammalian cells. We found that mammalian CAT-tails were mainly composed of alanine with several other amino acids including glycine and threonine and alanine-tailing promoted the degradation of the tailed proteins when they are expressed at a relatively low level, but formed protein aggregates and induced apoptotic cell death when expressed at high level or upon the failure of RQC.

Academic Significance and Societal Importance of the Research Achievements

近年、新生タンパク質の品質管理がタンパク質恒常性の維持に重要な役割を果たし、その異常が神経・精神疾患、がん、生活習慣病などさまざまなヒト疾患にも関わることが示唆されている。本研究では異常な翻訳停滞によって誘導される新生タンパク質分解機構RQC(ribosome-associated quality control)に注目し、神経変性疾患の原因となりうることが報告されていた異常新生タンパク質の末端修飾(CATテイル)の同定とCATテイル化タンパク質の蓄積が細胞死を誘導する際の配列依存性を解明することに成功した。

Report

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

    (5 results)

All 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (3 results) (of which Invited: 2 results)

  • [Journal Article] Optimized protocol for tRNA identification in the ribosomal complexes from human cell lines2021

    • Author(s)
      Tsuyoshi Udagawa, Moeka Seki, Toshifumi Inada
    • Journal Title

      STAR Protocols

      Volume: 2(3) Issue: 3 Pages: 100615-100615

    • DOI

      10.1016/j.xpro.2021.100615

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Failure to Degrade CAT-Tailed Proteins Disrupts Neuronal Morphogenesis and Cell Survival2021

    • Author(s)
      Udagawa Tsuyoshi、Seki Moeka、Okuyama Taku、Adachi Shungo、Natsume Tohru、Noguchi Takuya、Matsuzawa Atsushi、Inada Toshifumi
    • Journal Title

      Cell Reports

      Volume: 34 Issue: 1 Pages: 108599-108599

    • DOI

      10.1016/j.celrep.2020.108599

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 異常翻訳の品質管理因子による認知機能制御2022

    • Author(s)
      宇田川剛、奥山卓、関萌香、稲田利文
    • Organizer
      第95回日本生化学会大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Failure to Degrade CAT-Tailed Proteins Disrupts Neuronal Morphogenesis and Cell Survival2021

    • Author(s)
      Tsuyoshi Udagawa, Moeka Seki, Taku Okuyama, Shungo Adachi, Tohru Natsume, Takuya Noguchi, Atsushi Matsuzawa, Toshifumi Inada
    • Organizer
      第22回日本RNA学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 異常翻訳に対する品質管理機構RQCによる不良新生タンパク質のクリアランスは神経細胞生存に重要である2021

    • Author(s)
      Tsuyoshi Udagawa, Moeka Seki, Taku Okuyama, Shungo Adachi, Tohru Natsume, Takuya Noguchi, Atsushi Matsuzawa, Toshifumi Inada
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Research-status Report
    • Invited

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

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