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The molecular mechanism of HCV-induced protein degradation via chaperone mediated autophagy

Research Project

Project/Area Number 19K16671
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49060:Virology-related
Research InstitutionKobe University

Principal Investigator

Matsui Chieko  神戸大学, 医学研究科, 助教 (70778414)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
KeywordsC型肝炎ウイルス / NS5A蛋白質 / シャペロン介在性オートファジー / HSC70 / LAMP-2A / 選択的蛋白質分解 / CMA標的配列 / HNF-1α / HCV / ライソソーム分解 / C型肝炎
Outline of Research at the Start

C型肝炎ウイルス(HCV)感染により、HCV NS5A蛋白質と結合する転写因子HNF-1αが、シャペロン介在性オートファジー(CMA)を介して選択的に分解されることを示した。そのことはHCVによる高血糖の分子メカニズム解明につながることから、HNF-1α以外のNS5A結合因子もまたCMA分解を受けて、病原性を発揮していると考えられる。
本研究では、NS5A結合因子の中からCMAで分解誘導される新規宿主因子を同定し、HCV感染におけるCMAの病態生理学的意義を解明する。

Outline of Final Research Achievements

Chaperone mediated autophagy (CMA) carries a substrate protein into the lysosomal lumen using HSC70 and LAMP-2A. Substrate proteins of CMA contain a CMA-targeting motif, which is selectively recognized by HSC70. CMA promotes the degradation of a specific substrate protein that enters into the lysosome through LAMP-2A. We previously reported that HCV NS5A interacts with HSC70 and recruits HSC70 to substrate protein, thereby promoting the lysosomal degradation of substrate protein via CMA. More than 130 host proteins have been identified as NS5A-interacting proteins. In this study, we examined the potential CMA-targeting motif in NS5A interacting proteins. We found novel host proteins that are degraded by lysosomes via the CMA-dependent pathway.

Academic Significance and Societal Importance of the Research Achievements

シャペロン介在性オートファジー(CMA)は、分解される宿主蛋白質が5アミノ酸からなるCMA標的配列を有していることが条件となる選択的分解機構である。
本研究では、HCV NS5A結合因子の中からシャペロン介在性オートファジーで分解誘導される新規宿主因子を同定した。さらなるHCV感染とCMAの解析により、HCV感染による新しい病原性発現機構の解明と治療法開発の端緒となることが期待できる。

Report

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

    (7 results)

All 2021 2020 2019

All Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] HCV NS3/4A protease cleaves SPG20 for formation of large lipid droplets2021

    • Author(s)
      Chieko Matsui, Putu Yuliandari, Lin Deng, Takayuki Abe, Ikuo Shoji
    • Organizer
      27th International Symposium on Hepatitis C and Related Viruses
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hepatitis C Virus infection Promotes the Lysosomal Degradation of Diacylglycerol O-acyltransferase 1 (DGAT1)2021

    • Author(s)
      Putu Yuliandari, Chieko Matsui, Lin Deng, Takayuki Abe, Ikuo Shoji
    • Organizer
      27th International Symposium on Hepatitis C and Related Viruses
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] HCV NS3/4AプロテアーゼはSPG20を選択的に切断し脂肪滴の巨大化を促進する2020

    • Author(s)
      松井 千絵子, Yuliandari Putu, Deng Lin, 阿部 隆之, 勝二 郁夫
    • Organizer
      第43回日本分子生物学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Hepatitis C Virus infection Promotes the Lysosomal Degradation of Diacylglycerol O-acyltransferase 1 (DGAT1)2020

    • Author(s)
      Putu Yuliandari, Chieko Matsui, Lin Deng, Takayuki Abe, Ikuo Shoji
    • Organizer
      第43回日本分子生物学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] HCV NS3/4A Protease Specifically Cleaves SPG20 and Promotes the Formation of Large Lipid Droplets2019

    • Author(s)
      Chieko Matsui, Putu Yuliandari, Lin Deng, Takayuki Abe, Ikuo Shoji
    • Organizer
      26th International Symposium on Hepatitis C and Related Viruses
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] HCV NS3/4Aプロテアーゼは SPG20を選択的に切断し脂肪滴の巨大化を促進する2019

    • Author(s)
      松井 千絵子, Yuliandari Putu, Deng Lin, 阿部 隆之, 勝二 郁夫
    • Organizer
      第67回日本ウイルス学会学術集会
    • Related Report
      2019 Research-status Report
  • [Presentation] Hepatitis C Virus NS5A Protein Promotes the Lysosomal Degradation of Diacylglycerol Oacyltransferase 1 (DGAT1) via Chaperone-mediated Autophagy2019

    • Author(s)
      Putu Yuliandari, Chieko Matsui, Lin Deng, Takayuki Abe, Ikuo Shoji
    • Organizer
      第67回日本ウイルス学会学術集会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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