• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Elucidation of substrate-processing mechanisms of ring-shaped AAA chaperones by in vitro systems

Research Project

Project/Area Number 16H04764
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Functional biochemistry
Research InstitutionKumamoto University

Principal Investigator

OGURA Teru  熊本大学, 発生医学研究所, 教授 (00158825)

Co-Investigator(Kenkyū-buntansha) 江崎 雅俊  熊本大学, 発生医学研究所, 助教 (70437911)
山中 邦俊  熊本大学, 発生医学研究所, 准教授 (90212290)
野井 健太郎  熊本大学, 発生医学研究所, 特定事業研究員 (30588405)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2018: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2016: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords分子シャペロン / タンパク質分解 / タンパク質の品質管理 / プロテアソーム / 神経変性疾患 / ミトコンドリア / オートファジー / リソソーム / 細胞内タンパク質分解 / リボソーム品質管理 / AAAタンパク質
Outline of Final Research Achievements

We have found that a AAA chaperone p97 (also called VCP in mammals, Cdc48 in yeast, and CDC-48 in nematodes) associates with the 20S proteasome, and the p97-20S proteasome degrades a subset of cellular proteins such as Sod1. It has been suggested that p97 threads substrates through its pore to unfold and translocate them to the 20S proteasome. In maintenance of mitochondrial morphology and turnover of mitochondrial proteins in yeast, we have revealed that a Cdc48 cofactor Ubx2 is involved in the turnover of a mitochondrial fusion factor Fzo1, and that another cofactor Ubp3 is essential for maintenance of mitochondrial morphology. UBXN-6 is a cofactor, which binds to both the N domain and C-terminus of C. elegans CDC-48. We have revealed that UBXN-6 is induced upon starvation, and that its mutant shows defective formation of late endosomes and short lifespan.

Academic Significance and Societal Importance of the Research Achievements

AAA型シャペロンp97/Cdc48/CDC-48が20Sプロテアソームと会合して、新規プロテアソームとして機能し、Sod1などを分解することを明らかにしたが、Sod1の変異及びヒトp97ホモログVCPの変異は、筋萎縮性側索硬化症(ALS)の原因として報告されていることから、ALSの発症にこの新規プロテアソームが関与する可能性が示唆された。p97が他のAAA型シャペロンでも提唱されているようにポアループ依存的に基質タンパク質をほどくことが示され、共通分子機構の解明が進んだ。ミトコンドリアの維持やエンドソームの形成に関わる補因子が同定され、これらの分子機構の一端が解明された。

Report

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

    (9 results)

All 2019 2018 2017 2016 Other

All Journal Article (5 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (3 results) (of which Invited: 2 results) Remarks (1 results)

  • [Journal Article] Functional characterization of UBXN-6, a C-terminal cofactor of CDC-48, in C. elegans2019

    • Author(s)
      Mojumder Suman、Sawamura Rie、Murayama Yuki、Ogura Teru、Yamanaka Kunitoshi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 509 Issue: 2 Pages: 462-468

    • DOI

      10.1016/j.bbrc.2018.12.155

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Biological and Pathological Implications of an Alternative ATP-Powered Proteasomal Assembly With Cdc48 and the 20S Peptidase2018

    • Author(s)
      Esaki Masatoshi、Johjima-Murata Ai、Islam Md. Tanvir、Ogura Teru
    • Journal Title

      Frontiers in Molecular Biosciences

      Volume: 5

    • DOI

      10.3389/fmolb.2018.00056

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two Cdc48 cofactors Ubp3 and Ubx2 regulate mitochondrial morphology and protein turnover2018

    • Author(s)
      Chowdhury Abhijit、Ogura Teru、Esaki Masatoshi
    • Journal Title

      The Journal of Biochemistry

      Volume: 164 Issue: 5 Pages: 349-358

    • DOI

      10.1093/jb/mvy057

    • NAID

      40021724809

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 蛋白質分解経路のキープレーヤーp97/Cdc482018

    • Author(s)
      小椋 光、江崎 雅俊
    • Journal Title

      医学のあゆみ

      Volume: 267 Pages: 1041-1047

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Deviation of the typical AAA substrate-threading pore prevents fatal protein degradation in yeast Cdc482017

    • Author(s)
      Esaki Masatoshi、Islam Md. Tanvir、Tani Naoki、Ogura Teru
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 5475-5475

    • DOI

      10.1038/s41598-017-05806-y

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Cdc48-20Sプロテアソームによるタンパク質分解2018

    • Author(s)
      江崎 雅俊、Islam Md. Tanvir、大石 宙人、小椋 光
    • Organizer
      第41回日本分子生物学会年会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] AAA molecular chaperone Cdc48 functions with the 20S proteasome to maintain protein homeostasis2017

    • Author(s)
      Islam Md. Tanvir、Kaneko Seiya、Esaki Masatoshi、Ogura Teru
    • Organizer
      第40回日本分子生物学会年会(ConBio 2017)
    • Related Report
      2017 Annual Research Report
  • [Presentation] 多機能AAAタンパク質Cdc48はいかにして基質タンパク質に作用するのか?2016

    • Author(s)
      江崎 雅俊、Md.Tanvir Islam、小椋 光
    • Organizer
      第39回日本分子生物学会年会
    • Place of Presentation
      横浜
    • Year and Date
      2016-12-01
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Remarks] 発生医学研究所ニュープレス

    • URL

      http://www.imeg.kumamoto-u.ac.jp/np92/

    • Related Report
      2017 Annual Research Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi