在De Novo设计的金属蛋白组件中确定Allostery的结构和能量基础
Lewis A Churchfield1, Robert G Alberstein1, Laura M Williamson1
1Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093-0356 , United States.
Journal of the American Chemical Society
|July 13, 2018
概括
研究人员设计了一种新型的全蛋白组件,该组合将离子结合到二硫化物键的变化. 这种蛋白质设计有助于我们更好地理解复杂生物系统中的机械合.
科学领域:
- 蛋白质工程和设计
- 生物化学和分子生物物理学
- 超分子化学 超分子化学
背景情况:
- 设计功能性蛋白质组合与复杂的行为,如全ostery是具有挑战性的.
- 以前的工作创建了一个全蛋白组件 (Zn-C38/C81/C96R1) 连接ZnII离子结合到二硫化键动态.
- 这种全osteric 合的能量基础和最小结构要求尚未完全理解.
研究的目的:
- 为了研究Zn-C38/C81/C96蛋白质组合中的全结合的能量基础.
- 确定实现ZnII离子和二硫化物键形成/水解之间的机械合的最小结构要求.
- 阐明局部接口环境和四级架构在选择性二硫化物键裂解中的作用.
主要方法:
- 具有C38-C38二硫化键的蛋白质结构 (C38/C96 R1和C38 R1) 的表征.
- 对工程蛋白组件的 Zn 结合特性进行分析.
- 广泛的分子动力学模拟C38/C81/C96R14探测能量景观.
主要成果:
- 在C38-C38二硫化键周围的局部接口环境对于其选择性裂变至关重要.
- 稳定的四元架构对于使ZnII协调和蛋白质-蛋白质接口之间的结构合至关重要.
- 相关结构的表征提供了对全功能结构要求的见解.
结论:
- C38-C38二硫化键的选择性裂变是由稳定的四级结构内的局部接口因素控制的.
- 这项研究阐明了新型蛋白质组合中全性控制的能量基础和结构先决条件.
- 这些发现推动了蛋白质设计领域的发展,用于创建复杂,响应敏捷的生物分子机器.
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