在R-状态血红蛋白中进行双胞胎重结:对多个疏水口袋的动态和计算证据
Silvia Sottini1, Stefania Abbruzzetti, Francesca Spyrakis
1Dipartimento di Fisica, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy.
Journal of the American Chemical Society
|December 8, 2005
概括
一氧化碳与血红蛋白的重新结合显示了二相动力学在凝. 子探测确定了参与这种连接体迁移的远端疏水口袋.
科学领域:
- 生物物理学的生物物理.
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 双相双酸盐将一氧化碳 (CO) 重新结合到肌球蛋白与疏水性腔内的连接物分布有关.
- 之前的研究使用了时间解析晶体学,占用率和分子模拟来理解这些相互作用.
研究的目的:
- 为了研究二相双酸二氧化碳与人体血红蛋白的重结.
- 描述二氧化碳再结合所涉及的动态路径和能量障碍.
- 用作为探针在血红蛋白内识别潜在的连接物对接点.
主要方法:
- 在湿的纳米多孔凝中捕获的与CO结合的人类血红蛋白的闪光光光解.
- 使用分支运动方案 (状态A,B,C) 的动态分析.
- 在不同的甘油度下确定激活度.
- 使用来识别疏水性对接腔的计算建模.
主要成果:
- 人类血红蛋白在凝中表现出双相双CO重结.
- 一个分支的动力模型与初级 (C) 和二级 (B) 的对接点准确地描述了重新绑定过程.
- 在血的远端发现了两个不同的疏水口袋,其中一个与已知的肌球蛋白位点 (Xe4) 相对应.
- B和C对接点之间的能量障碍很小,它们的连接相对较开放.
结论:
- 远端疏水口袋在二相双相CO重结血红蛋白中起着至关重要的作用.
- 蛋白质粘度对这些远部位之间的连接体迁移的能量有有限的影响.
- 鉴定到的对接点和动力学方案为了解血红蛋白中的连接体动态提供了一个框架.
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