2qcp | pdb_00002qcp

1.0 A Structure of CusF-Ag(I) residues 10-88 from Escherichia coli

spinqualitylabelsall models 2qcp, resolution 1.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2qcp is a 1 chain structure with sequence from Escherichia coli str. k-12 substr. w3110. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AG, NO3, SO4 Related: 1zeq Gene: cusF, cusX (Escherichia coli str. K-12 substr. W3110) Resources: FirstGlance, OCA, RCSB, PDBsum Function [CUSF_ECOLI] Part of a cation efflux system that mediates resistance to copper and silver. Binds one copper per polypeptide. 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 PubMed Elevated levels of copper or silver ions in the environment are an immediate threat to many organisms. Escherichia coli is able to resist the toxic effects of these ions through strictly limiting intracellular levels of Cu(I) and Ag(I). The CusCFBA system is one system in E. coli responsible for copper/silver tolerance. A key component of this system is the periplasmic copper/silver-binding protein, CusF. Here the X-ray structure and XAS data on the CusF-Ag(I) and CusF-Cu(I) complexes, respectively, are reported. In the CusF-Ag(I) structure, Ag(I) is coordinated by two methionines and a histidine, with a nearby tryptophan capping the metal site. EXAFS measurements on the CusF-Cu(I) complex show a similar environment for Cu(I). The arrangement of ligands effectively sequesters the metal from its periplasmic environment and thus may play a role in protecting the cell from the toxic ion. Unusual Cu(I)/Ag(I) coordination of Escherichia coli CusF as revealed by atomic resolution crystallography and X-ray absorption spectroscopy.,Loftin IR, Franke S, Blackburn NJ, McEvoy MM Protein Sci. 2007 Oct;16(10):2287-93. PMID:17893365 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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