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2013 Fiscal Year Final Research Report

Functional analysis of human ABC transporters involved in HDL generation.

Research Project

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Project/Area Number 24780101
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied biochemistry
Research InstitutionKyoto University

Principal Investigator

KIMURA Yasuhisa  京都大学, (連合)農学研究科(研究院), 助教 (10415143)

Project Period (FY) 2012-04-01 – 2014-03-31
KeywordsABCタンパク質 / ABCG1 / コレステロール / HDL / 膜輸送体 / タンパク質精製
Research Abstract

Cholesterol is an essential component for our body as a constituent of plasma membrane and precursor of steroid hormones. Since the excess cholesterol is harmful to cells, cholesterol homeostasis in peripheral tissues are tightly regulated. In this research, we purified human ABCG1 and ABCG4, and analyzed its substrate specificity by measuring ATPase activity.
Purified ABCG1 showed the ATPase activity that comparable to those of active transporters. The ATPase activity of ABCG1, reconstituted in phosphatidylserine liposome, was stimulated by cholesterol and choline phospholipids (especially sphingomyelin). The ATPase activity of ABCG4 was stimulated in cholesterol containing liposomes. Unlike ABCG1, choline phospholipids showed no effects on the ATPase activity. Our results suggest that ABCG1 and ABCG4 are active lipid transporters and ABCG1 recognizes cholesterol and sphingomyelin as transport substrates, while ABCG4 is a cholesterol specific transporter.

  • Research Products

    (12 results)

All 2014 2013 2012

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (10 results)

  • [Journal Article] 脂質輸送型ABCタンパク質の基質認識2014

    • Author(s)
      木村泰久
    • Journal Title

      輸送機構

      Volume: 39(2) Pages: 68-73

  • [Journal Article] ATPase activity of human ABCG1 is stimulated by cholesterol and sphingomyelin2013

    • Author(s)
      Hirayama H, Kimura Y, Kioka N, Matsuo M, Ueda K
    • Journal Title

      J. Lipid Res.

      Volume: 54 Pages: 496-502

    • Peer Reviewed
  • [Presentation] Substrate recognition of human ABCG1 and ABCG42014

    • Author(s)
      Yasuhisa Kimura
    • Organizer
      5th FEBS special meeting,ATP-Binding Cassette (ABC) Proteins : From Multidrug Resistance to Genetic Diseases
    • Place of Presentation
      Innsbruck, Austria
    • Year and Date
      20140309-14
  • [Presentation] 精製タンパク質を用いたヒトABCタンパク質の機能解析2014

    • Author(s)
      木村泰久
    • Organizer
      日本農芸化学会2014年度大会
    • Place of Presentation
      東京
    • Year and Date
      2014-03-30
  • [Presentation] ATPase activity of human ABCG1 is stimulated by cholesterol and choline phospholipids2013

    • Author(s)
      Yasuhisa Kimura
    • Organizer
      Benzon Symposium No. 59 - Membrane proteins : Structure, Function and Dynamics
    • Place of Presentation
      Copenhagen, Denmark
    • Year and Date
      20130819-22
  • [Presentation] 精製タンパク質を用いたヒトABCB6の機能解析2013

    • Author(s)
      大貫元
    • Organizer
      日本農芸化学会2013年度大会
    • Place of Presentation
      仙台
    • Year and Date
      20130324-28
  • [Presentation] Analysis of the substrate specificity of ABCB62013

    • Author(s)
      Hajime Ohnuki
    • Organizer
      RSC-iCeMSシンポジウム
    • Place of Presentation
      京都
    • Year and Date
      20130318-19
  • [Presentation] Purification and functional analysis of cholesterol transporter ABCG12013

    • Author(s)
      Hiroshi Hirayama
    • Organizer
      RSC-iCeMSシンポジウム
    • Place of Presentation
      京都
    • Year and Date
      20130318-19
  • [Presentation] Characterization of the substrate specificity of ABCB62013

    • Author(s)
      Hajime Ohnuki
    • Organizer
      The 14th International Membrane Research Forum
    • Place of Presentation
      京都
    • Year and Date
      20130315-17
  • [Presentation] Functional analysis of purified ABCG1 expressed in human cultured cells2012

    • Author(s)
      Hiroshi Hirayama
    • Organizer
      ASBMB : Frontiers in Lipid Biology
    • Place of Presentation
      Banff Canada
    • Year and Date
      20120905-08
  • [Presentation] ヒトABCB6の精製と機能解析2012

    • Author(s)
      大貫元
    • Organizer
      第85回日本生化学会大会
    • Place of Presentation
      福岡
    • Year and Date
      2012-12-15
  • [Presentation] K_ATPチャネル複合体のサブユニット間相互作用部位の探索2012

    • Author(s)
      井上修一
    • Organizer
      第85回日本生化学会大会
    • Place of Presentation
      福岡
    • Year and Date
      2012-12-15

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Published: 2015-06-25  

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