ケトステロイドイソメラーゼと光活性黄色タンパク質の活性部位中の構造結合ネットワーク
Journal of the American Chemical Society
|July 11, 2018
まとめ
タンパク質のネットワークにおける水素結合は構造的に結合し,ある結合の変化が他の結合に影響する. 複数のタンパク質で観察されるこの結合は 生物学的システムの基本的な性質を示唆しています
科学分野:
- 生物化学
- 構造生物学
- タンパク質ダイナミクス
背景:
- タンパク質の折りたたみ,認識,触媒,アロステリーに影響を与える 重要なネットワークを形成する.
- これらの水素結合ネットワーク内の構造的結合は完全に理解されていません.
研究 の 目的:
- タンパク質ネットワーク内の水素結合の範囲と性質を調査する.
- ある水素結合の乱れが ネットワーク内の他の結合に 影響するかどうかを判断する.
主な方法:
- ケトステロイドイソメラーゼの2種類と 光活性黄色いタンパク質を研究した.
- サイト指向型変異と非自然なアミノ酸置換を用いて,水素結合ネットワークを乱した.
- 水素結合の長さの変化を測定するために,1H NMRと高解像度のX線結晶学を使用した.
主要な成果:
- 一つのオキシアニオンホールの水素結合を混乱させると,もう一方に逆の影響を及ぼした.
- ディスタル水素結合はオキシアニオンホール結合にも影響を及ぼし,より密接な結合はより大きな影響を及ぼした.
- 3つのシステムで19回の測定で - 0. 30 ± 0. 03の一貫した結合因子が観察されました.
- 分子力学とQM/MM計算は近接結合を再現し,遠隔効果にはQM/MMが必要であり,極化作用を強調した.
結論:
- タンパク質のネットワーク内の水素結合は 長い距離であっても 重要な構造的結合を示します
- この結合は 周囲のタンパク質構造に わずかな影響があるようです
- 発見は,新しいシステムに適用可能な水素結合の定量的な関係を提供し,これらの相互作用における二極化の重要性を示唆しています.
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