構成の柔軟性を調節することによってタンパク質相互作用ドメインファミリーの進化
Dustin S Whitney1, Brian F Volkman1, Kenneth E Prehoda2
1Department of Biochemistry, Medical College of Wisconsin , Milwaukee, Wisconsin 53226, United States.
Journal of the American Chemical Society
|August 10, 2016
まとめ
タンパク質の柔軟性は 機能に不可欠です GKタンパク質相互作用領域 (GKPID) へのガニラートキナーゼ (GK) の柔軟性を低下させる変異は,非機能的構造を制限することによって,その新しい機能を最適化しました.
科学分野:
- 生物化学
- 進化生物学
- 構造生物学
背景:
- タンパク質は機能のために特定の形状を必要としますが,柔軟性は非機能状態につながる可能性があります.
- グアニラートキナーゼ (GK) はGKタンパク質相互作用領域 (GKPID) に進化し,機能的進化における柔軟性の役割を研究する機会を提供した.
研究 の 目的:
- 新しいタンパク質の機能の進化にどのようにタンパク質の構造の柔軟性が影響するかを調査する.
- GKPIDへの移行中のガニラートキナーズのダイナミックな振る舞いを分析する.
主な方法:
- 祖先のガニラートキナーゼと進化したGKPIDの動的行動の比較分析.
- タンパク質の柔軟性や構成状態に 歴史的変異の影響を調査する.
主要な成果:
- 祖先のGK酵素は,開いた (核酸結合) と閉じた (触媒的) 構造を採用し,高い柔軟性を示した.
- GKPIDに繋がる変異は,脊椎の回転を制限することで,柔軟性が著しく低下した.
- 柔軟性の低下は非機能的構造を防止し,タンパク質の結合を最適化しました.
結論:
- タンパク質の構造的柔軟性は タンパク質機能の重要な進化的調節因子である.
- 柔軟性を最適化する変異は,GKからGKPIDへの移行のように,新しい役割にタンパク質を適応させるのに不可欠です.
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