连接物度调节了合蛋白折叠和结合的途径
Kyle G Daniels1, Nam K Tonthat, David R McClure
1Department of Biochemistry, Duke University Medical Center , Durham, North Carolina 27710, United States.
Journal of the American Chemical Society
|December 25, 2013
概括
带结合和蛋白质构造的变化依赖于度. 这项研究表明,形状选择和诱导适合之间的争论是一个错误的二分法,机制根据连接体水平而异.
科学领域:
- 生物化学和分子生物学
- 蛋白质动力学和蛋白质调节
背景情况:
- 结合的带结合和蛋白质构造变化对于生物调节至关重要.
- 连接物结合与形状变化的精确顺序 (形状选择与诱导适合) 是一个长期的争论.
研究的目的:
- 调查连接物度在确定合结合和构造变化的机制中的作用.
- 为了解决形状选择和诱导适合模型之间的二分法.
主要方法:
- 使用酸盐 (PPi) 与 Bacillus subtilis RNase P 蛋白质的结合作为一个模型系统.
- 分析了具有不同的结合和构造变化的不同顺序的竞争路径之间的流动.
主要成果:
- 证明该机制依赖于连接体 (PPi) 度,驳斥了严格的二分法.
- 通过调节折叠和展开速度,显示了连接体结合改变了蛋白质构造组合.
- 观察到,路径之间的分区与PPi度有显著的变化.
结论:
- 形状选择和诱导适合之间的区别是一个错误的二分法,取决于连接物度.
- 干结合诱导蛋白质结构动态的显著和多样化的变化.
- 结合和形状变化的顺序是一个依赖于度的现象.
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