Cherezov V, Höfer N, Szebenyi DM, Kolaj O, Wall JG, Gillilan R, Srinivasan V, Jaroniec CP, Caffrey M, Insights into the mode of action of a putative zinc transporter CzrB in Thermus thermophilus., Structure (London, England : 1993), 16, 9, 2008, 1378-88
Structure (London, England : 1993) 16 9
The crystal structures of the cytoplasmic domain of the putative zinc transporter CzrB in the apo and zinc-bound forms reported herein are consistent with the protein functioning in vivo as a homodimer. NMR, X-ray scattering, and size-exclusion chromatography provide support for dimer formation. Full-length variants of CzrB in the apo and zinc-loaded states were generated by homology modeling with the Zn2+/H+ antiporter YiiP. The model suggests a way in which zinc binding to the cytoplasmic fragment creates a docking site to which a metallochaperone can bind for delivery and transport of its zinc cargo. Because the cytoplasmic domain may exist in the cell as an independent, soluble protein, a proposal is advanced that it functions as a metallochaperone and that it regulates the zinc-transporting activity of the full-length protein. The latter requires that zinc binding becomes uncoupled from the creation of a metallochaperone-docking site on CzrB.
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