ホフメイスターアニオンとタンパク質の結合ポケットの相互作用
Jerome M Fox1, Kyungtae Kang1, Woody Sherman2
1†Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States.
Journal of the American Chemical Society
|March 5, 2015
まとめ
ホフマイスターアニオンは,コファクターとイオンペアを形成するか,または水害性領域と相互作用することによって,タンパク質ポケットに結合します. アニオン結合はタンパク質内の水の構造を変え,最初の水分化殻を超えて広がります.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 物理化学 物理化学
背景:
- ホフマイスターアニオンはタンパク質の構造と機能に影響を与えます.
- イオン-タンパク質の相互作用を理解することは,生物学的プロセスの鍵です.
- イオン-タンパク質結合における水の役割は複雑である.
研究 の 目的:
- ホフメイスターアニオンのヒト炭酸アンヒドラゼII (HCAII) との結合を調査する.
- アニオンの性質が結合の位置と強さをどのように決定するかを判断する.
- アニオン結合がタンパク質の空洞内の水構造に与える影響を調べる.
主な方法:
- アニオンとタンパク質の相互作用を視覚化するためのX線結晶学.
- 結合熱力学を定量化するための同熱定位熱計.
- 水の再配置を研究するための分子ダイナミクスシミュレーション.
主要な成果:
- アニオンは,HCAIIの Zn(2+) コファクターと内球イオンペアを形成する.
- アニオン-Zn(2+) アソシエーションの強さは,アニオン脱水エネルギーと相関しています.
- ヨウ化物とブロミドは,水嫌性領域に結合し,アニオンは8 Åまで水を再配置する.
結論:
- 弱水化アニオンは,補完的な水性ポケットに結合する.
- タンパク質におけるイオン誘発による水の再編成は広範囲に及ぶ.
- ホフマイスターアニオン (Hofmeister anion) は,タンパク質の水分化と電荷分布を変化させる多機能リガンドである.
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