3byr
Mode of Action of a Putative Zinc Transporter CzrB (Zn form)Mode of Action of a Putative Zinc Transporter CzrB (Zn form)
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe 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. Insights into the mode of action of a putative zinc transporter CzrB in Thermus thermophilus.,Cherezov V, Hofer N, Szebenyi DM, Kolaj O, Wall JG, Gillilan R, Srinivasan V, Jaroniec CP, Caffrey M Structure. 2008 Sep 10;16(9):1378-88. PMID:18786400[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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