线体结合和 conformational 运动在肌球蛋白
A Ostermann1, R Waschipky, F G Parak
1Fakultät für Physik, Technische Universität München, Garching, Germany.
Nature
|March 21, 2000
概括
在180K以下,肌球蛋白 (Mb) 中的光解离联体在冷蛋白中迁移. 在180K以上,连接体通过蛋白质波动逃离远端口袋,揭示了连接体-蛋白质动态.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 蛋白质动力学 蛋白质动力学
背景情况:
- 肌球蛋白 (Mb) 是一种模型蛋白质,用于研究气体连接体结合动态.
- 在Mb中的配体光解离显示了复杂的动力学中间体和蛋白质放松.
研究的目的:
- 通过使用X射线晶体学来研究连接物解离后肌球蛋白的结构变化.
- 为了阐明在不同温度下肌球蛋白内结合体迁移和重新结合的途径.
主要方法:
- 一氧化碳-肌球蛋白 (MbCO突变L29W) 晶体的X射线晶体学.
- 一氧化碳 (CO) 重结的时间分辨率红外光谱学.
- 在180K以下和以上的水晶的照明.
主要成果:
- 在180K以下,光解离联体迁移到和从静止的Mb.的远端口袋内的特定位置重新结合.
- 在180K以上,蛋白质的波动打开了暂时的出口通道,使干能够逃离远端口袋.
- 在较高的温度下,在海姆组的相反侧的腔内找到了联体.
结论:
- 连接体从肌球蛋白中脱离是取决于温度的,由蛋白质动力学和短暂的通道开放促进.
- 蛋白质的结构波动在控制连接体的输出和输入方面发挥着至关重要的作用.
- 肌球蛋白的内部腔体充当了关键的储存库和带迁移的途径.
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