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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >Application of the continuous variation method to cooperative interactions: mechanism of Fe(II)-ferrozine chelation and conditions leading to anomalous binding ratios.
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Application of the continuous variation method to cooperative interactions: mechanism of Fe(II)-ferrozine chelation and conditions leading to anomalous binding ratios.

机译:连续变异法在协同相互作用中的应用:Fe(II)-铁锌螯合的机理和导致异常结合比率的条件。

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摘要

The method of continuous variation, often known as the Job plot, has long been used for determining the stoichiometry of two interacting components. The correct binding ratio, n, is generally obtained when the total concentration of the reactants, C(o), is much greater than the dissociation constants involved. For non-cooperative binding systems, the stoichiometry varies between one and n as C(o) increases; whereas for positive cooperative systems, values larger than n may be observed at low C(o). In this report, we present examples to illustrate how the changing apparent stoichiometries as a function of C(o) can provide clues for differentiating various binding mechanisms. To test these concepts, we examined the chelation of Fe(II) with ferrozine in the range of C(o)=7 to 210 &mgr;M with Fe(II) expressed in molar concentration or in terms of its binding equivalents (three in this case). The results were analyzed according to several models and found to be most consistent with the mechanism of one-stepcomplex formation or infinite cooperativity with a K(d) of 8 &mgr;M.
机译:连续变化的方法(通常称为作业图)长期以来一直用于确定两个相互作用组分的化学计量。当反应物的总浓度C(o)远大于所涉及的解离常数时,通常可获得正确的结合率n。对于非合作结合系统,随着C(o)的增加,化学计量在1和n之间变化。而对于正合作系统,在低C(o)时可能会观察到大于n的值。在本报告中,我们提供了一些实例来说明如何根据C(o)改变表观化学计量能为区分各种结合机制提供线索。为了检验这些概念,我们研究了Fe(II)与铁锌在C(o)= 7到210μM范围内的螯合,其中Fe(II)以摩尔浓度或结合当量表示(三这个案例)。根据几种模型对结果进行了分析,发现结果与单步形成络合物或K(d)为8 M的无限协同作用的机理最一致。

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