Unique methionine-aromatic interactions govern the calmodulin redox sensor.

Unique methionine-aromatic interactions govern the calmodulin redox sensor.
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独特的蛋氨酸-芳香族相互作用控制着钙调蛋白氧化还原传感器。

DOI:
10.1016/j.bbrc.2018.09.052
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发表时间:
2018
影响因子:
3.1
通讯作者:
Klein,JenniferC
Klein,JenniferC
中科院分区:
生物学4区
文献类型:
--
作者:
Walgenbach,DanielG;Gregory,AndrewJ;Klein,JenniferC

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钙调蛋白含有多种氧化还原敏感的蛋氨酸,其氧化会改变许多靶标的调节。分子动力学模拟用于定义控制钙调蛋白在结构上如何检测和响应蛋氨酸氧化的分子原理。我们发现钙调蛋白的开放和闭合状态优先通过独特的、氧化还原敏感的甲硫氨酸-芳香族相互作用来稳定。关键的蛋氨酸-芳香族相互作用与 EF 手螺旋的重新定向相关。旨在模拟蛋氨酸氧化的蛋氨酸到谷氨酰胺的取代通过调节蛋氨酸-芳香族相互作用的强度来强烈改变构象转变。总之,这些结果表明了一种广泛适用的氧化还原传感机制,通过该机制,细胞氧化剂对甲硫氨酸的氧化改变了对功能性蛋白质动力学至关重要的甲硫氨酸-芳香族相互作用的强度。
Calmodulin contains multiple redox sensitive methionines whose oxidation alters the regulation of numerous targets. Molecular dynamics simulations were used to define the molecular principles that govern how calmodulin is structurally poised to detect and respond to methionine oxidation. We found that calmodulin's open and closed states were preferentially stabilized by unique, redox sensitive, methionine-aromatic interactions. Key methionine-aromatic interactions were coupled to reorientation of EF hand helices. Methionine to glutamine substitutions designed to mimic methionine oxidation strongly altered conformational transitions by modulating the strength of methionine-aromatic interactions. Together, these results suggest a broadly applicable redox sensing mechanism though which methionine oxidation by cellular oxidants alters the strength of methionine-aromatic interactions critical for functional protein dynamics.
甲硫氨酸氧化扰乱朊病毒蛋白的结构核心并提示通用错误折叠途径*
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