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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Analysis of differences in oxygen sensitivity of Fe-S clusters
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Analysis of differences in oxygen sensitivity of Fe-S clusters

机译:Fe-S簇的氧敏感性差异分析

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Many but not all iron-sulphur clusters in metalloproteins are known to be sensitive to molecular oxygen with dramatic consequences for their biological function. We performed a systematic quantum chemical investigation that sheds light on the differences in oxygen sensitivity depending on charge and spin states of these clusters as well as on their spatial fixation by the enzyme's scaffold. We find that significant structural distortions are required to bind O_2 exothermically to [Fe_2S_2] and [Fe _3S_4] clusters, while only small conformational changes allow for the thermodynamically favorable coordination of molecular oxygen to [Fe_4S_4] cubanes and [Fe_4S_3] clusters.
机译:已知金属蛋白中的许多(但不是全部)铁硫簇对分子氧敏感,对其生物学功能产生重大影响。我们进行了系统的量子化学研究,揭示了氧敏感性的差异,这些差异取决于这些簇的电荷和自旋状态,以及它们通过酶支架的空间固定。我们发现需要显着的结构畸变才能将O_2放热结合到[Fe_2S_2]和[Fe _3S_4]簇上,而只有很小的构象变化允许分子氧与[Fe_4S_4]古巴和[Fe_4S_3]簇进行热力学上有利的配位。

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