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首页> 外文期刊>Acta crystallographica.Section D. Biological crystallography >Distinguishing between Cl(-) and O(2)(2-) as the bridging element between Fe(3+) and Cu(2+) in resting-oxidized cytochrome c oxidase.
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Distinguishing between Cl(-) and O(2)(2-) as the bridging element between Fe(3+) and Cu(2+) in resting-oxidized cytochrome c oxidase.

机译:区分Cl(-)和O (2) (2 -)Fe(3 +)和铜之间的连接元素(2 +)resting-oxidized细胞色素c氧化酶。

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摘要

Fully oxidized cytochrome c oxidase (CcO) under enzymatic turnover is capable of pumping protons, while fully oxidized CcO as isolated is not able to do so upon one-electron reduction. The functional difference is expected to be a consequence of structural differences: [Fe(3+)-OH(-)] under enzymatic turnover versus [Fe(3+)-O(2)(2-)-Cu(2+)] for the as-isolated CcO. However, the electron density for O(2)(2-) is equally assignable to Cl(-). An anomalous dispersion analysis was performed in order to conclusively demonstrate the absence of Cl(-) between the Fe(3+) and Cu(2+). Thus, the peroxide moiety receives electron equivalents from cytochrome c without affecting the oxidation states of the metal sites. The metal-site reduction is coupled to the proton pump.
机译:完全氧化细胞色素氧化酶(CcO)酶的营业额能够注入质子,虽然不能完全氧化CcO孤立在单电子还原。将一个功能差异由于结构上的差异:(Fe(3 +) -哦(-)]在酶的营业额对比[Fe (3 +) - o(2)(2)铜(2 +)]的孤立的罗经航向。然而,电子密度为O (2) (2 -)同样可转让的Cl(-)。色散分析是为了执行最终证明没有Cl (-)Fe(3 +)和铜(2 +)。一部分接收的电子等价物细胞色素c在不影响氧化州的网站。降低耦合质子泵。

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