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Structural basis for the selection mechanism of specific kinase signaling pathways via stimuli-dependent modulations of the functional equilibrium

Research Project

Project/Area Number 17K15083
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Structural biochemistry
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Tokunaga Yuji  国立研究開発法人産業技術総合研究所, 生命工学領域, 研究員 (80713354)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsタンパク質キナーゼ / シグナル伝達 / ストレス応答 / pH依存性 / MAPキナーゼp38 / 基質特異性 / ダイナミクス / 溶液NMR法 / キナーゼ / p38 / 立体構造 / 構造平衡 / 核磁気共鳴法 / 基質選択性 / リン酸化 / 分子間相互作用 / pH / 細胞内情報伝達 / 溶液NMR
Outline of Final Research Achievements

It remained to be elucidated how MAPK p38α, involved in various cellular responses, phosphorylates a substrate, which is optimal to each type of response, out of a number of its specific substrates. Here, I investigated a mechanism of substrate selection under the stress condition that lead to weak acidification of cytosol. It was shown that the phosphorylation of ATF2, a substrate of p38α under stress stimuli, is enhanced under weakly acidic conditions, irrespective of coexistence of a high-affinity substrate, MK2. This was achieved by the multi-site protonation of the allositeric interaction site of ATF2 that contains four unique histidine residues. In addition, protonation of a histidine residue in the substrate-binding site of p38α weakened the affinity for phosphoacceptor sites, thereby exclude non-specific pseudo-substrates. These findings demonstrate the regulatory role of pH in achieving a high fidelity stress response, by directing p38α toward the optimal substrate.

Academic Significance and Societal Importance of the Research Achievements

本研究では、細胞応答に不可欠である、刺激に適合したシグナル経路の活性化機構を、申請者が独自に発見した分子機構に基づき、刺激に付随した細胞内環境の変化を新たに考慮して解析し、仮説を裏付ける結果を得た。環境依存的なシグナル選別は、p38αのみならず、膜受容体や転写因子など、シグナル伝達ネットワークのハブタンパク質に共通すると考えられ、このような新たな研究分野の開拓を促す重要な成果と言える。また、シグナル選別機構の理解は、標的のシグナル経路のみを遮断する副作用の少ない薬剤等の開発にもつながる基礎的知見を提供することから、研究成果の社会的な意義も大きい。

Report

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

    (5 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results)

  • [Journal Article] Forbidden Coherence Transfer of 19F Nuclei to Quantitatively Measure the Dynamics of a CF3-Containing Ligand in Receptor-Bound States2017

    • Author(s)
      Tokunaga Yuji、Takeuchi Koh、Shimada Ichio
    • Journal Title

      Molecules

      Volume: 22 Issue: 9 Pages: 1492-1492

    • DOI

      10.3390/molecules22091492

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ATP濃度減少およびpH低下を伴うストレス条件下におけるMAPK p38αのシグナル伝達最適化機構の溶液NMR法による解明2019

    • Author(s)
      徳永 裕二、竹内 恒、高橋 栄夫、嶋田 一夫
    • Organizer
      第9回定量生物学の会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 溶液NMR法を用いたMAPK p38αによるストレスシグナル伝達最適化の構造機構の解明2018

    • Author(s)
      徳永 裕二、竹内 恒、高橋 栄夫、嶋田 一夫
    • Organizer
      第56回生物物理学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] MAPK p38αによるストレス刺激に適合した基質選別機構の解明2017

    • Author(s)
      徳永 裕二
    • Organizer
      第56回NMR討論会(東京都八王子市)
    • Related Report
      2017 Research-status Report
  • [Presentation] 溶液 NMR 法を用いた MAPK p38αによるストレス刺激に適合した基質選別機構の解明2017

    • Author(s)
      徳永 裕二
    • Organizer
      ConBio2017(兵庫県神戸市)
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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