システム間交差点におけるアミノ酸二重体の構造的な溶解
Ulrich J Lorenz1, Thomas R Rizzo
1Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
Journal of the American Chemical Society
|September 25, 2014
まとめ
陽子化されたフェニララニン/セリンの二重体の興奮状態ダイナミクスを研究した. S1状態からT1状態へのシステム間交差は,潜在エネルギー表面を探索する溶融構造につながります.
科学分野:
- 物理化学 物理化学
- スペクトル顕微鏡検査です.
- 化学ダイナミクス 化学ダイナミクス
背景:
- 興奮状態のダイナミクスを理解することは,分子プロセスにとって極めて重要です.
- 陽子化されたアミノ酸二重体は,バイオ分子相互作用の洞察を提供します.
研究 の 目的:
- フェニララニン (Phe) /セリン (Ser) の陽子化されたジメルの興奮状態ダイナミクスを調査するために.
- フォトエキシテーション後の構造的進化とエネルギー景観を明らかにする.
主な方法:
- 紫外線 (UV) レーザー刺激によりS1状態にします.
- 振動モードの赤外線 (IR) 探査.
- ダイナミクスを監視するための時間解像度スペクトルスコピー.
主要な成果:
- S1状態は,約70nsの寿命を示しています.
- T1状態へのシステム間交差 (ISC) が観察されました.
- 構造的進化は,ISCの後,潜在エネルギー表面 (PES) の探査を示し,融解した構造につながります.
結論:
- S1状態の寿命とISC経路は,ダイマーのダイナミクスの鍵です.
- 振動エネルギー増加による異体化障壁の克服は,構造的探査を推進する.
- 陽子化されたPhe/Serジメルは,T1状態で溶融構造を採用しています.
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