Solution structure of the N-terminal domain of a potential copper-translocating P-type ATPase from Bacillus subtilis in the apo and Cu(I) loaded states

Journal of Molecular Biology
Lucia BanciF J Ruiz-Dueñas

Abstract

A putative partner of the already characterized CopZ from Bacillus subtilis was found, both proteins being encoded by genes located in the same operon. This new protein is highly homologous to eukaryotic and prokaryotic P-type ATPases such as CopA, Ccc2 and Menkes proteins. The N-terminal region of this protein contains two soluble domains constituted by amino acid residues 1 to 72 and 73 to 147, respectively, which were expressed both separately and together. In both cases only the 73-147 domain is folded and is stable both in the copper(I)-free and in the copper(I)-bound forms. The folded and unfolded state is monitored through the chemical shift dispersion of 15N-HSQC spectra. In the absence of any structural characterization of CopA-type proteins, we determined the structure of the 73-147 domain in the 1-151 construct in the apo state through 1H, 15N and 13C NMR spectroscopies. The structure of the Cu(I)-loaded 73-147 domain has been also determined in the construct 73-151. About 1300 meaningful NOEs and 90 dihedral angles were used to obtain structures at high resolution both for the Cu(I)-bound and the Cu(I)-free states (backbone RMSD to the mean 0.35(+/-0.06) A and 0.39(+/-0.07) A, respectively). The structural assessmen...Continue Reading

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