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Dimerization-induced signal generation of GPCR: Single molecule observation in live cells

Research Project

Project/Area Number 17K07333
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Functional biochemistry
Research InstitutionKyoto University

Principal Investigator

Kasai Rinshi  京都大学, ウイルス・再生医科学研究所, 助教 (20447949)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords細胞内1分子計測 / Gタンパク質共役型受容体 / ダイマー形成 / G蛋白質共役型受容体 / 蛍光1分子観察 / リガンド刺激 / 動的 / 人工ダイマー / 1分子計測(SMD) / 生物物理 / シグナル伝達 / 生理学 / バイオテクノロジー
Outline of Final Research Achievements

G-protein coupled receptors (GPCRs) constitute the largest receptor family. Recently, it has been found that some species of class A-GPCRs form transient dimers in the plasma membrane. However, the function and significance of dimerization of GPCR remain unclear.
By employing dual-color single fluorescent-molecule observation technique in live cells, we succeeded in directly observing trimeric G-protein recruitment to both GPCR monomer and dimer at a 30 Hz. We also found that inverse agonists inhibit G-protein recruitment only to dimer, suggesting that the transient dimer generates the constitutive activity of GPCR (a weak signaling activity that does not depend on ligand binding). Moreover, it was also found that dimerization of GPCR itself has a signaling activity because cytosolic calcium concentration was elevated by artificially inducing GPCR dimerization. These results suggest that both dimerization and ligand binding cooperate to generate biological signals in live cells.

Academic Significance and Societal Importance of the Research Achievements

本研究によって、長年未解明であった、Gタンパク質共役型受容体(GPCR)の一過的なダイマー形成の意義の一端が明らかになった。すなわち、一過的なダイマーを形成することで、リガンド結合に依存しないGPCRの弱いシグナル活性を生じること、ダイマー形成が安定化することで、シグナルを生じること、また、リガンド結合とダイマー形成が組み合わさることでシグナル生成を行うらしいことがはじめて明らかになった。
本発見によって、GPCRのシグナル制御に関連する、創薬等に新しい概念がもたらされると考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (14 results)

All 2020 2019 2018 2017 2016 Other

All Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results) Remarks (1 results)

  • [Journal Article] Defining raft domains in the plasma membrane2019

    • Author(s)
      Akihiro Kusumi、Takahiro K. Fujiwara、Taka A. Tsunoyama、Rinshi S. Kasai、An‐An Liu、Koichiro M. Hirosawa、Masanao Kinoshita、Nobuaki Matsumori、Naoko Komura、Hiromune Ando、Kenichi G. N. Suzuki
    • Journal Title

      Traffic

      Volume: 21 Issue: 1 Pages: 106-137

    • DOI

      10.1111/tra.12718

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Super-long single-molecule tracking reveals dynamic-anchorage-induced integrin function.2018

    • Author(s)
      Takaaki A. Tsunoyama, Yusuke Watanabe, Junri Goto, Kazuma Naito, Rinshi S. Kasai, Kenichi G. N. Suzuki, Takahiro K. Fujiwara, Akihiro Kusumi.
    • Journal Title

      Nature Chemical Biology

      Volume: 14 Issue: 5 Pages: 497-506

    • DOI

      10.1038/s41589-018-0032-5

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] The Class-A GPCR Dopamine D2 Receptor Forms Transient Dimers Stabilized by Agonists: Detection by Single-Molecule Tracking2018

    • Author(s)
      Kasai Rinshi S.、Ito Shuichi V.、Awane Ryo M.、Fujiwara Takahiro K.、Kusumi Akihiro
    • Journal Title

      Cell Biochemistry and Biophysics

      Volume: 76 Issue: 1-2 Pages: 29-37

    • DOI

      10.1007/s12013-017-0829-y

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dynamic Meso-Scale Anchorage of GPI-Anchored Receptors in the Plasma Membrane: Prion Protein vs. Thy12017

    • Author(s)
      Nemoto YL, Morris, RJ, Hijikata H, Tsunoyama TA, Shibata ACE, Kasai RS, Kusumi A, Fujiwara TK
    • Journal Title

      Cell Biochemistry and Biophysics

      Volume: 75 Issue: 3-4 Pages: 399-412

    • DOI

      10.1007/s12013-017-0808-3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A novel spingomyeling/cholesterol specific probe reveals the dynamics of the membrane domain during virus and in Nieman-Pick type C2016

    • Author(s)
      Makino, A., Sako, Y. et al.
    • Journal Title

      FASEB J.

      Volume: 31 Issue: 4 Pages: 1301-1322

    • DOI

      10.1096/fj.201500075r

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 蛍光1分子観察法による膜分子の動態観察と機能の解明:G蛋白質共役型受容体の動的なモノマー・ダイマー変換2020

    • Author(s)
      笠井倫志
    • Organizer
      日本化学会 第100春季年会 (2020) シンポジウム発表 (コロナウイルス禍のため予稿集上での開催)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Examining the transiently formed GPCR dimer: An approach by single fluorescent molecule observation in living cells2019

    • Author(s)
      笠井倫志
    • Organizer
      第57回日本生物物理学会 年回 シンポジウム発表
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Examining the transiently formed GPCR dimer: An approach by single fluorescent molecule observation in living cells2019

    • Author(s)
      笠井倫志
    • Organizer
      第57回日本生物物理学会 年回
    • Related Report
      2019 Annual Research Report
  • [Presentation] Transient dimer formation of G-protein coupled receptor: single fluorescent molecule imaging in live cells2018

    • Author(s)
      Kasai RS
    • Organizer
      The 3rd Biosignal Research Center International Symposium “Modulation of GPCR signaling by membrane heterogeneity and molecular clustering”
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Gタンパク質共役型受容体の動的なダイマー形成:蛍光1 分子観察法による解明2018

    • Author(s)
      笠井倫志
    • Organizer
      日本農芸化学会 中部支部 第184回例会 若手シンポジウム “化学と生物のマリアージュ:若手研究者による生化学研究の新機軸”
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Transient dimers of GPCRs are responsible for triggering GPCRs’ basic constitutive signals - A finding by the two-color single fluorescent-molecule tracking in living cells2018

    • Author(s)
      Kasai RS, Fujiwara TK, Kusumi A
    • Organizer
      Cold Spring Harbor meeting: Single Biomolecules
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spontaneous activation in a transient GPCR dimer before ligation as revealed by dual-channel single fluorescent molecule imaging2018

    • Author(s)
      Kasai RS
    • Organizer
      第56回日本生物物理学会 年回
    • Related Report
      2018 Research-status Report
  • [Presentation] β-arrestin independent mechanism is involved in the temporal trapping of diffusing GPCR on cell surface2017

    • Author(s)
      Kasai RS, Inoue A, Fujiwara TK, Kusumi A
    • Organizer
      第55回日本生物物理学会 年回
    • Related Report
      2017 Research-status Report
  • [Remarks] 京都大学 ウイルス・再生医科学研究所 生命システム研究部門 ナノバイオプロセス分野

    • URL

      https://www.infront.kyoto-u.ac.jp/research/lab24/

    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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