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Study on Rab6 effectors that regulate the secretory pathway

Research Project

Project/Area Number 20K15739
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43030:Functional biochemistry-related
Research InstitutionNational Institute of Infectious Diseases (2021-2022)
Tohoku University (2020)

Principal Investigator

Homma Yuta  国立感染症研究所, 細胞化学部, 流動研究員 (70812642)

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 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsRab / 小胞輸送 / 分泌経路
Outline of Research at the Start

可溶性分泌タンパク質や膜タンパク質は、小胞体で合成された後、ゴルジ体を経て細胞膜へと送達される(分泌経路)。各オルガネラ間の積荷分子の輸送は小胞を介して行われるが、どのようにして小胞を適切な目的地へ仕分け、輸送しているのかについては未だ不明な点が多く残されている。本研究では、分泌経路を制御する低分子量Gタンパク質Rab6に焦点を当て、その分子メカニズムの解明を目的とする。具体的には、Rabの機能を理解するために必要な、特異的な結合分子(エフェクター)を同定するため、生化学的・遺伝学的アプローチを駆使して、新規のRab6エフェクターを同定し、詳細な分子機構に迫ることを目指す。

Outline of Final Research Achievements

A small GTPase Rab6 regulates the secretory pathway in mammalian cells, however, the molecular mechanism was not fully understood. In this study, biochemical and genetic analyses revealed the requirement of VPS52, a subunit of the GARP complex, for the secretory pathway. I showed that secretory cargos are not efficiently secreted and missorted to lysosomes in VPS52-deficient cells, the same as in Rab6-deficient cells. The functionally unknown C-terminal half of VPS52 was shown to be required for the secretory pathway.

Academic Significance and Societal Importance of the Research Achievements

分泌経路は、細胞が様々な分泌分子(可溶性分泌タンパク質や膜タンパク質)を細胞外(細胞膜)へと輸送する主要な経路であるが、それぞれの分泌分子がどのように選別・輸送されているかについての分子メカニズムは不明な点も多く残されている。本研究によってVPS52が分泌経路で機能することが明らかにされたことで、細胞の根幹的機能である分泌現象の基礎的な理解を進展させるとともに、分泌異常に関連する疾患の病態解明・治療等につながることが期待される。

Report

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

    (8 results)

All 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 5 results)

  • [Journal Article] The N-terminal Leu-Pro-Gln sequence of Rab34 is required for ciliogenesis in hTERT-RPE1 cells2021

    • Author(s)
      Oguchi Mai E、Homma Yuta、Fukuda Mitsunori
    • Journal Title

      Small GTPases

      Volume: - Issue: 1 Pages: 77-83

    • DOI

      10.1080/21541248.2021.1894910

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rab34 GTPase mediates ciliary membrane formation in the intracellular ciliogenesis pathway2021

    • Author(s)
      Ganga Anil Kumar、Kennedy Margaret C.、Oguchi Mai E.、Gray Shawn、Oliver Kendall E.、Knight Tracy A.、De La Cruz Enrique M.、Homma Yuta、Fukuda Mitsunori、Breslow David K.
    • Journal Title

      Current Biology

      Volume: 31 Issue: 13 Pages: 2895-2905

    • DOI

      10.1016/j.cub.2021.04.075

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The endocytic pathway taken by cationic substances requires Rab14 but not Rab5 and Rab72021

    • Author(s)
      Trofimenko Evgeniya、Homma Yuta、Fukuda Mitsunori、Widmann Christian
    • Journal Title

      Cell Reports

      Volume: 37 Issue: 5 Pages: 109945-109945

    • DOI

      10.1016/j.celrep.2021.109945

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Establishment and analysis of conditional Rab1- and Rab5-knockout cells using the auxin-inducible degron system2021

    • Author(s)
      Hatoyama Yuki、Homma Yuta、Hiragi Shu、Fukuda Mitsunori
    • Journal Title

      Journal of Cell Science

      Volume: 134 Issue: 24

    • DOI

      10.1242/jcs.259184

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Knockout analysis of Rab6 effector proteins revealed the role of VPS52 in the secretory pathway2021

    • Author(s)
      Homma Yuta、Fukuda Mitsunori
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 561 Pages: 151-157

    • DOI

      10.1016/j.bbrc.2021.05.009

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] RBD11, a bioengineered Rab11-binding module for visualizing and analyzing endogenous Rab112021

    • Author(s)
      Osaki Futaba、Matsui Takahide、Hiragi Shu、Homma Yuta、Fukuda Mitsunori
    • Journal Title

      Journal of Cell Science

      Volume: - Issue: 7

    • DOI

      10.1242/jcs.257311

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A comprehensive analysis of Rab GTPases reveals a role for Rab34 in serum starvation-induced primary ciliogenesis2020

    • Author(s)
      Oguchi Mai E.、Okuyama Koki、Homma Yuta、Fukuda Mitsunori
    • Journal Title

      Journal of Biological Chemistry

      Volume: 295 Issue: 36 Pages: 12674-12685

    • DOI

      10.1074/jbc.ra119.012233

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Novel Method for Visualizing Melanosome and Melanin Distribution in Human Skin Tissues2020

    • Author(s)
      Yoshikawa-Murakami Chikako、Mizutani Yuki、Ryu Akemi、Naru Eiji、Teramura Takashi、Homma Yuta、Fukuda Mitsunori
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 21 Issue: 22 Pages: 8514-8514

    • DOI

      10.3390/ijms21228514

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access

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

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