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Hypothesis: entatic versus ecstatic states in metalloproteins.
Metallomics ( IF 2.9 ) Pub Date : 2019-10-09 , DOI: 10.1039/c9mt00208a
Wilfred R Hagen 1
Affiliation  

Over half a century ago the hypothesis was put forth that redox-active metal ions and multidentate protein ligands may combine to form a local state of entasis: an irregular symmetry intermediate between those dictated by coordination chemistry for the two redox states involved. Such an energetically poised domain would be at the basis of high activity (notably electron-transfer rates) in biological systems. Today the concept of the entatic state has become textbook material. Based on EPR spectroscopic data it is proposed here that poised, entatic states may only be of marginal existence; rather the occurrence of relatively wide distributions of coordination geometries (or: ecstatic states) afford a stochastic tuning of structure towards low-energy unimolecular transition states.

中文翻译:

假设:金属蛋白的对映态与狂喜态。

半个多世纪以前提出了这样的假设:氧化还原活性金属离子和多齿蛋白质配体可以结合形成局部氧化状态:在两个涉及的氧化还原状态的配位化学所决定的氧化态之间是不规则的对称中间体。这种能量平衡的区域将基于生物系统中的高活性(特别是电子传输速率)。今天,对立状态的概念已成为教科书的材料。根据EPR光谱数据,这里提出平衡的,对立的状态可能只存在于边缘状态。相反,相对较宽的配位几何分布(或狂喜态)会导致结构向低能单分子过渡态的随机调整。
更新日期:2019-10-09
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