C-Terminal Domain of the Membrane Copper Transporter Ctr1 from Saccharomyces cerevisiae Binds Four Cu(I) Ions as a Cuprous-Thiolate Polynuclear Cluster: Sub-femtomolar Cu(I) Affinity of Three Proteins Involved in Copper Trafficking

化学 酿酒酵母 酵母 离解常数 结晶学 电喷雾电离 胞浆 离解(化学) 质谱法 立体化学 分析化学(期刊) 生物化学 色谱法 受体 物理化学 有机化学
作者
Zhiguang Xiao,Fionna E. Loughlin,Graham N. George,Geoffrey J. Howlett,Anthony G. Wedd
出处
期刊:Journal of the American Chemical Society [American Chemical Society]
卷期号:126 (10): 3081-3090 被引量:240
标识
DOI:10.1021/ja0390350
摘要

The cytosolic C-terminal domain of the membrane copper transporter Ctr1 from the yeast Saccharomyces cerevisiae, Ctr1c, was expressed in E. coli as an oxygen-sensitive soluble protein with no significant secondary structure. Visible-UV spectroscopy demonstrated that Ctr1c bound four Cu(I) ions, structurally identified as a Cu(I)(4)(micro-S-Cys)(6) cluster by Xray absorption spectroscopy. This was the only metalated form detected by electrospray ionization mass spectrometry. An average dissociation constant K(D) = (K(1)K(2)K(3)K(4))(1/4) = 10(-)(19) for binding of Cu(I) to Ctr1c was estimated via competition with the ligand bathocuproine disulfonate bcs (beta(2) = 10(19.8)). Equivalent experiments for the yeast chaperone Atx1 and an N-terminal domain of the yeast Golgi pump Ccc2, which both bind a single Cu(I) ion, provided similar K(D) values. The estimates of K(D) were supported by independent estimates of the equilibrium constants K(ex) for exchange of Cu(I) between pairs of these three proteins. It is apparent that, in vitro, the three proteins buffer "free" Cu(I) concentrations in a narrow range around 10(-)(19) M. The results provide quantitative support for the proposals that, in yeast, (a) "free" copper concentrations are very low in the cytosol and (b) the Cu(I) trafficking gradient is shallow along the putative Ctrlc --> Atx1 --> Ccc2n metabolic pathway. In addition, both Ctr1c and its copper-responsive transcription factor Mac1 contain similar clusters which may be important in signaling copper status in yeast.
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