首页> 外文期刊>Journal of Biomolecular Structure and Dynamics >Copper(I)-alkyl sulfide and -cysteine tri-nuclear clusters as models for metallo proteins: a structural density functional analysis.
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Copper(I)-alkyl sulfide and -cysteine tri-nuclear clusters as models for metallo proteins: a structural density functional analysis.

机译:铜(I)-烷基硫化物和-半胱氨酸三核簇作为金属蛋白的模型:结构密度泛函分析。

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After having set up the computational methodology for Cu(I)-sulfur systems as models for copper proteins, namely using the simple ligands H(2)S, HS(-), CH(3)SH, and CH(3)S(-), the Cu(I)-Cysteine systems have been investigated: [Cu(I)( S -H(2)Cys) (n) ](+) (H(2)Cys, cysteine, NH(2),SH,COOH) [Cu(I)( S -HCys) (n) ](1-) (n) (NH(2),S(-),COOH). Finally, the structures for bi-nuclear [Formula: see text] (Et, CH(2)CH(3)), [Formula: see text] and tri-nuclear [Cu(I)( S -SH)](3), [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] (NH(2),SH,COOH), [Formula: see text] (NH(2),S(-),COOH, and NH(2),SH,COO(-)), as well as [Formula: see text] (NH(2),S(-),COO(-)), were also optimized to mimic the active center for a metallo-chaperone copper transport protein (CopZ). The X-ray structures for the biomolecules were matched fairly well as regards the Cu-S bond distances and Cu…Cu contact distances in the case the model cysteine S atom is deprotonated. Upon protonation of ligand S atoms, the conformation of clusters is altered and might bring about the di- and tri-nuclear core breakage. These findings suggest that subtle protonation/deprotonation steps, i.e. small and/or local pH changes play a significant role for copper transport processes.
机译:建立铜(I)-硫系统的计算方法作为铜蛋白的模型后,即使用简单的配体H(2)S,HS(-),CH(3)SH和CH(3)S( -),研究了Cu(I)-半胱氨酸系统:[Cu(I)(S -H(2)Cys)(n)](+)(H(2)Cys,半胱氨酸,NH(2), SH,COOH)[Cu(I)(S -HCys)(n)](1-)(n)(NH(2),S(-),COOH)。最后,双核[式:参见文本](Et,CH(2)CH(3)),[式:参见文本]和三核[Cu(I)(S -SH)](3 ),[公式:请参见文字],[公式:请参见文字],[公式:请参见文字],[公式:请参见文字](NH(2),SH,COOH),[公式:请参见文字](NH(2 ),S(-),COOH和NH(2),SH,COO(-))以及[公式:请参见文字](NH(2),S(-),COO(-))是还进行了优化,以模仿金属伴侣铜转运蛋白(CopZ)的活性中心。在模型半胱氨酸S原子去质子化的情况下,关于生物分子的X射线结构在Cu-S键距离和Cu…Cu接触距离方面相当匹配。配体S原子质子化后,簇的构象发生改变,并可能导致二核和三核核心断裂。这些发现表明,微妙的质子化/去质子化步骤,即小的和/或局部的pH变化对于铜的运输过程起着重要的作用。

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