来自热爱体的细胞染色体c'-α的形态刚性与缓慢的NO结合有关
Sotaro Fujii1, Michael T Wilson2, Hannah R Adams2
1Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, United Kingdom; Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, United Kingdom; Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan.
热稳定的细菌氧化 (NO) 结合蛋白因形状刚性而显示较慢的NO结合动力学. 这项研究揭示了蛋白质结构如何影响蛋白的NO协调,包括与NO传感器相关的蛋白.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 细胞染色体c'-α是结合氧化 (NO) 的细菌血红蛋白.
- 一种中性细胞染色体c'-α (AxCP-α) 呈现出一种独特的NO结合机制,涉及远端和近端血协调.
- 了解热稳定性如何影响NO结合对于描述这些蛋白质至关重要.
研究的目的:
- 为了描述来自Hydrogenophilus thermoluteolus的热友性细胞染色体c'-α (PhCP-α) 的NO结合机制.
- 研究蛋白质热稳定性对NO结合动力学和结构特征的影响.
主要方法:
- 电子偏磁共振 (EPR) 光谱学
- 共振拉曼光谱法 共振拉曼光谱法
- 时间分辨率的紫外线对吸收率光谱 (停止流)
- 在X射线晶体学.
主要成果:
- 通过距离六坐标Fe(II) -NO (6cNO) 的中间体,PhCP-α形成了一个近位五坐标Fe(II) -NO (5cNO) 的产物.
- 在PhCP-α中6cNO和5cNO形成的NO结合率显著较慢 (比AxCP-α低11倍和13倍).
- X射线结构揭示了PhCP-α的形状刚性,归因于由Arg-75/Glu-135盐桥稳定的Arg-132残留物,阻碍了近接带的移位.
结论:
- 蛋白质的热稳定性,通过形状刚性,显著减缓了细胞染色体c'-α中的NO结合动力学.
- 结构因素,如特定的盐桥,在调节蛋白中的NO协调和结合机制方面发挥着关键作用.
- 这些发现提供了对蛋白中NO结合的见解,包括与真核生物NO传感器相关的5cNO复合体.
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