ATP との弱い非特異的相互作用がタンパク質に与える影響
Mayu Nishizawa1, Erik Walinda2, Daichi Morimoto1
1Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|August 2, 2021
まとめ
アデノシントリフォスファート (ATP) は,タンパク質と弱く相互作用する水分素として作用する. この代謝産物とタンパク質の相互作用により,タンパク質の水分化が変化し,細胞内の全体的な表面保護が提供される可能性があります.
科学分野:
- 生化学と生理学
- 分子生物学
- タンパク質の集積
背景:
- アデノシン三酸化物 (ATP) は,エネルギー伝達,核酸合成,信号伝達において確立された役割を持つ重要な代謝物である.
- 最近の仮説では,ATPは水素型として機能し,潜在的にアミロイド生成タンパク質の結合を阻害することが示唆されている.
- ATPがタンパク質の行動に及ぼす正確なメカニズムと一般的な物理化学的影響は,大部分が特徴づけられていない.
研究 の 目的:
- ATPとタンパク質の非共性相互作用を調査する.
- ATP-タンパク質の共存の物理化学的結果を解明する.
- タンパク質とATPの相互作用が特異的か一般的かを判断する.
主な方法:
- 核磁共振 (NMR) スペクトロスコーピー
- 分子力学 (MD) のシミュレーション
- 溶液NMR
- 補完的な生体物理的方法
主要な成果:
- 固有の乱れや折りたたまれたタンパク質を含む様々なタンパク質とATPの間で,弱い,濃度依存の,非共性相互作用が観察されました.
- ATPとタンパク質の相互作用により,溶媒に曝露したタンパク質の水分化が変化した.
- ATPは,テストされたタンパク質に一般的で非特異的な結合を示した.
- ATPは,マグネシウム依存および独立した経路を通じて,生理学的濃度 (5-10 mM) でオリゴメリック状態を形成する.
結論:
- ATPは様々なタンパク質と 弱い,一般的な,非特異的な相互作用をします.
- これらの相互作用はタンパク質の水分を変化させ,タンパク質の表面に保護効果をもたらす可能性があります.
- ATPの高細胞内濃度は,タンパク質との頻繁な一時的な相互作用を示唆し,代謝物媒介によるタンパク質表面保護に貢献しています.
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