アロマティック・サイド・チェーン・ウォーター・トゥ・リピッド・トランスファー・フリー・エナジーは,膜全体の深度依存を示している
Sarah K McDonald1, Karen G Fleming1
1T.C. Jenkins Department of Biophysics, Johns Hopkins University , Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|June 3, 2016
まとめ
TrpやTyrのようなアロマティックサイドチェーンは 膜へのエネルギー・グラデントを示し,インターフェースを好む. この発見は,細胞二層内の膜タンパク質の安定性と相互作用を理解するために重要である.
科学分野:
- 生物化学
- 分子生物学
- バイオ物理学
背景:
- バイオ分子相互作用を理解することは 生物科学の鍵です
- 膜タンパク質は,脂質二層環境により,ユニークな課題を提示します.
- タンパク質と脂質の相互作用のエネルギー学は,細胞のプロセスにとって不可欠である.
研究 の 目的:
- アロマティックサイドチェーン (Trp,Tyr,Phe) の水から脂質への移行におけるギブス自由エネルギーの変化を定量化する.
- 膜内の深さの関数としてこれらの変化を調査する.
- 膜タンパク質の安定性におけるアロマティックサイドチェーンの役割を解明する.
主な方法:
- ホスト・ゲストの 変異戦略を採用した
- アロマティックサイドチェーンのギブス自由エネルギー計算.
- 測定された近隣結合効果.
主要な成果:
- TrpとTyrのエネルギー・グラデーションを 明らかにした 膜のインターフェースを優先した
- 移転エネルギーが二重層の極性原子濃度グラデントと相関していることが観察されました.
- アロマティック・サイド・チェーン・ネットワークによる近隣結合を特定した.
結論:
- アロマティックサイドチェーンは膜タンパク質の安定性に大きく貢献する.
- 安定性は,アロマティック-アロマティック相互作用または有利な界面配置によって達成されます.
- この発見は 生物の膜における 極性原子の自然分布と一致しています
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