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P1B-3 型 ATP 酶 CopB 中的跨膜 II 型类似铜 2+ 结合位点:对金属选择性的影响。

Transmembrane type-2-like Cu2+ site in the P1B-3-type ATPase CopB: implications for metal selectivity.

机构信息

Division of Chemistry and Chemical Engineering and ‡Howard Hughes Medical Institute, California Institute of Technology , Pasadena, California 91125, United States of America.

出版信息

ACS Chem Biol. 2014 Jan 17;9(1):116-21. doi: 10.1021/cb400603t. Epub 2013 Nov 1.

Abstract

Metal selectivity in P1B-type ATPase transporters is determined by conserved amino acid residues in their transmembrane helices responsible for metal binding and transport across the cellular membrane. The Cu(2+)-selective CopB from Archaeoglobus fulgidus has been investigated to explore the coordination chemistry of the transition metal binding sites in P1B-3-type ATPases. Electronic absorption, electron paramagnetic resonance, and X-ray absorption spectroscopic studies indicate the presence of a high-affinity transmembrane Type-2-like Cu(2+) center in which a single cupric ion is coordinated in a distorted square pyramidal geometry by mixed nitrogen/oxygen and sulfur ligands.

摘要

金属选择性在 P1B 型 ATP 酶转运体中由其跨细胞膜负责金属结合和转运的跨膜螺旋中的保守氨基酸残基决定。已经研究了来自古生球菌属的 Cu(2+)-选择性 CopB,以探索 P1B-3 型 ATP 酶中过渡金属结合位点的配位化学。电子吸收、电子顺磁共振和 X 射线吸收光谱研究表明,存在一个高亲和力的跨膜 Type-2 样 Cu(2+)中心,其中一个单个的铜离子通过混合氮/氧和硫配体在扭曲的四方锥几何结构中配位。

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