Glu-286 rotation and water wire reorientation are unlikely the gating elements for proton pumping in cytochrome C oxidase.

Glu-286 rotation and water wire reorientation are unlikely the gating elements for proton pumping in cytochrome C oxidase.
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Glu-286 旋转和水线重新定向不太可能是细胞色素 C 氧化酶中质子泵送的门控元件。

DOI:
10.1016/j.bpj.2011.05.004
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发表时间:
2011
影响因子:
3.4
通讯作者:
Q. Cui
Q. Cui
中科院分区:
生物学3区
文献类型:
--
作者:
Shuo Yang;Q. Cui

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关于细胞色素氧化酶(CcO)中质子泵送的关键未解决问题之一是防止质子回流的门控元件的身份。在这项研究中,我们分析了两个流行的建议,这个元素:异构化的关键分支残基(Glu-286)和(重)取向的水分子在疏水腔。使用一组多方面的计算分析,涉及CcO嵌入在一个隐式或显式处理的脂质膜,我们表明,既不是Glu-286,也不是活性位点的水可能构成的门控元件。详细的能量和结构分析的模拟结果表明,在以前的工作中观察到的这些结构图案的门控相关的属性可能是在这些研究中采用的简化计算模型的结果。
One of the key unresolved issues regarding proton pumping in cytochromecoxidase (CcO) is the identity of the gating element that prevents the backflow of protons. In this study, we analyze two popular proposals for this element: isomerization of the key branching residue (Glu-286) and (re)orientation of water molecules in the hydrophobic cavity. Using a multifaceted set of computational analyses that involve CcO embedded in either an implicit or explicit treatment of lipid membrane, we show that neither Glu-286 nor active-site water likely constitutes the gating element. Detailed energetic and structural analyses of the simulation results indicate that the gating-relevant properties of these structural motifs observed in previous work are likely a result of the simplified computational models employed in those studies.
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影响因子: 3.3
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