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Study of molecular mechanisms for translation termination and ribosome recycling by eukaryotic ribosome

Research Project

Project/Area Number 20H03180
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43010:Molecular biology-related
Research InstitutionThe University of Tokyo

Principal Investigator

ITO KOICHI  東京大学, 大学院新領域創成科学研究科, 教授 (10262073)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Keywordsリボソーム / tRNA擬態タンパク質 / タンパク質合成 / 翻訳終結 / 品質管理 / リボソーム再生反応 / 翻訳再開始反応 / tRNA分子擬態タンパク質 / 分子遺伝学 / キーワード / リボソーム再生
Outline of Research at the Start

近年急速な機能・構造理解が進んだイメージがある遺伝暗号解読機構ではあるが、真核細胞においてのタンパク質合成終了反応からリボソーム再生反応が含まれる『翻訳終結過程』の分子機構の包括的理解は集積しつつある重要性の指摘に反してひときわ立ち後れている。本申請では、モデル生物(出芽酵母)の利点を駆使し、【1】 翻訳終結状態を識別する分子機構の分子遺伝学、【2】 mRNA上の翻訳終結のための因子群の動態を可視化する新規手法開発を実施し基礎生物学、さらには医学領域への貢献も目指します。

Outline of Final Research Achievements

Translation termination, a critical step in protein synthesis in eukaryotes, involves the interplay of various factors, including tRNA-elongation factor complex mimicking proteins (eRF1-eRF3, Pelota-HBS1), ribosome recycling factors, and quality control factors. To unravel the intricate molecular mechanisms underlying this process, we developed genetic screening systems and novel assay systems to monitor ribosome status.
Our investigations led to the identification of novel functional domains on ribosomal factors ASC1 and S20. These domains act in concert to form a binding interface for Hel2, a ubiquitin ligase that targets ribosome-associated proteins for degradation. We propose a novel mechanistic model, highlighting the cooperative role of these newly identified domains.These findings provide significant insights into the molecular basis of translation termination and hold promise for identifying novel drug target to address various human diseases.

Academic Significance and Societal Importance of the Research Achievements

mRNA上の遺伝暗号をタンパク質に翻訳するのは(翻訳反応)、タンパク質合成の中心装置であるリボソームと無数の翻訳関連因子群です。近年、必要なタンパク質を適切に合成するたに、異常な遺伝情報やそこから合成される有害なタンパク質の発現による弊害を抑制する仕組みとして翻訳終結に連動した品質管理機構に関心が高まっています。本研究は、それに関わる基本的な因子群の分子機構の一つを明らかにしました。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (5 results)

All 2023 2022

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results)

  • [Journal Article] Systematic genetic identification of functional domains on collided di‐ribosomes responsible for rescue pathways upon translation arrest in Saccharomyces cerevisiae.2023

    • Author(s)
      Otsuka Hiroshi、Endo Kei、Wada Miki、Ito Koichi
    • Journal Title

      The FEBS Journal

      Volume: - Issue: 15 Pages: 3748-3763

    • DOI

      10.1111/febs.16781

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The CGA codon decoding through tRNAArg(ICG) supply governed by Tad2/Tad3 in Saccharomyces cerevisiae2023

    • Author(s)
      Wada Miki、Ito Koichi
    • Journal Title

      The FEBS Journal

      Volume: - Issue: 13 Pages: 3480-3489

    • DOI

      10.1111/febs.16760

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Novel Mg2+ binding sites in the cytoplasmic domain of the MgtE Mg2+ channels revealed by X-ray crystal structures2023

    • Author(s)
      Wang Mengqi、Zhao Yimeng、Hayashi Yoshiki、Ito Koichi、Hattori Motoyuki
    • Journal Title

      Acta Biochimica et Biophysica Sinica

      Volume: - Issue: 4 Pages: 683-690

    • DOI

      10.3724/abbs.2023067

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Human ABCE1 exhibits temperature‐dependent heterologous co‐functionality in S. cerevisiae2022

    • Author(s)
      Wada Miki、Ito Koichi
    • Journal Title

      FEBS Open Bio

      Volume: 12 Issue: 10 Pages: 1782-1787

    • DOI

      10.1002/2211-5463.13463

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Application of fluorescence correlation spectroscopy to investigate the dynamics of a ribosome-associated trigger factor in Escherichia coli2022

    • Author(s)
      Niwa Tatsuya、Nakazawa Koki、Hoshi Kensuke、Tadakuma Hisashi、Ito Koichi、Taguchi Hideki
    • Journal Title

      Frontiers in Molecular Biosciences

      Volume: 9 Pages: 891128-891128

    • DOI

      10.3389/fmolb.2022.891128

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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