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

Dissecting the mechanism for autophagic degradation of empty Argonaute

Research Project

Project/Area Number 17H06616
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Cell biology
Research InstitutionThe University of Tokyo

Principal Investigator

Kobayashi Hotaka  東京大学, 定量生命科学研究所, 博士研究員 (80802975)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsmicroRNA / Argonaute / ユビキチン / オートファジー / VCP
Outline of Final Research Achievements

In this study, we investigated how the empty state of Argonaute (AGO) proteins is degraded after ubiquitination. Our unpublished data had suggested that ubiquitinated empty AGO is degraded by autophagy, but not by the proteasome. Thus, first, we identified autophagy-related molecules that interact with ubiquitinated empty AGO. Next, we conducted functional analyses of these molecules to reveal the mechanism of empty AGO degradation. We found that VCP, a mediator of selective autophagy, recognizes ubiquitinated empty AGO via the Ufd1-Npl4 heterodimer to direct its degradation.

Academic Significance and Societal Importance of the Research Achievements

microRNAは多様な遺伝子の発現調節に寄与しており、その機能の破綻は様々な疾患にも繋がる。従って、microRNAが正常に機能するための細胞内の仕組みを理解することは、基礎研究・応用研究双方の観点から重要である。「空のAGOの分解」という現象は、microRNAによる遺伝子発現抑制が正常に起こる上で必須の現象であることが近年報告されている。しかしながら、その分解機構の実体については不明な点が数多く残されていた。本研究では、空のAGOの分解に必須の新規因子を複数同定することに成功し、それらの因子によるAGO分解機構を明らかにすることに成功した。

Report

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

    (8 results)

All 2019 2018 2017 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Iruka Eliminates Dysfunctional Argonaute by Selective Ubiquitination of Its Empty State2019

    • Author(s)
      Kobayashi Hotaka, Shoji Keisuke, Kiyokawa Kaori, Negishi Lumi, Tomari Yukihide
    • Journal Title

      Molecular Cell

      Volume: 73 Issue: 1 Pages: 119-129

    • DOI

      10.1016/j.molcel.2018.10.033

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Iruka ensures the quality of Argonaute by selective ubiquitination of its empty state2018

    • Author(s)
      Kobayashi H
    • Organizer
      13th Microsymposium on Small RNA Biology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Iruka ensures the quality of Argonaute by selective ubiquitination of its empty state2018

    • Author(s)
      Kobayashi H, Shoji K, Negishi L, Tomari Y
    • Organizer
      13th Microsymposium on Small RNA Biology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Iruka directs selective ubiquitination of empty Argonaute for successful miRNA-mediated silencing2018

    • Author(s)
      小林 穂高、庄司 佳祐、根岸 瑠美、泊 幸秀
    • Organizer
      第18回 東京大学生命科学シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] IrukaはmicroRNA非結合型Argonauteを選択的にユビキチン化する2017

    • Author(s)
      小林穂高、根岸瑠美、泊幸秀
    • Organizer
      第19回日本RNA学会年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Iruka mediates selective degradation of miRNA-unloaded Argonaute2017

    • Author(s)
      Kobayashi H, Negishi L, Tomari Y
    • Organizer
      The 43rd Naito Conference on “Noncoding RNA:Biology, Chemistry, & Diseases”
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Remarks]

    • URL

      http://www.iam.u-tokyo.ac.jp/tomari/jp/

    • Related Report
      2018 Annual Research Report
  • [Remarks]

    • URL

      https://researchmap.jp/hota-koba/

    • Related Report
      2018 Annual Research Report

URL: 

Published: 2017-08-25   Modified: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi