タンパク質チロシン・フォスファタゼ1Bにおける構成動態を調節する触媒ループにおける分子相互作用の発見
Danica S Cui1, James Michael Lipchock2, Dennis Brookner3
1Department of Chemistry , Yale University , New Haven , Connecticut 06511 , United States.
Journal of the American Chemical Society
|July 25, 2019
まとめ
タンパク質チロシン・ファスファタゼ1B (PTP1B) は,移転性WPDループを使用して脱リン化を行います. ループの動きは 位置だけでなく 触媒の速度と相関し 酵素機能の分散制御を明らかにします
科学分野:
- 酵素学
- 構造生物学
- 生物化学
背景:
- アクティブサイトループは,酵素機能,基質結合,中間結合,および触媒作用に不可欠です.
- タンパク質チロシンファスファターゼ1B (PTP1B) は,その活動に不可欠な移動性WPDループを特徴とする,脱リン酸化に関与する重要な酵素である.
研究 の 目的:
- PTP1B WPDループの構造,ダイナミクス,および機能の関係を調査する.
- WPDループの変異がコンフォームバランスと触媒効率にどのように影響するか理解する.
主な方法:
- 組み合わせたX線結晶学,溶液NMR,および安定状態前運動学.
- 野生型のPTP1Bと5つのWPDループ変異体について研究した.
主要な成果:
- WPDループの変異は,開いた状態と閉じた状態の間の構造バランスを変化させた.
- 触媒速度とWPDループの均衡位置の間の直接的な相関は見つかりませんでした.
- 触媒速度はループと隣接ドメインのミリ秒運動と強く相関しています.
結論:
- 酵素の触媒制御は分散し,柔軟なループだけでなく,周囲のタンパク質構造も関わります.
- ループのダイナミクスを理解することは,酵素機構と触媒サイクルを理解するために重要です.
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