3e3k

Structural characterization of a putative endogenous metal chelator in the periplasmic nickel transporter NikA (butane-1,2,4-tricarboxylate without nickel form)

spinqualitylabelsall models 3e3k, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3e3k is a 3 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: ACT, CL, GOL, HCT, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NIKA_ECOLI Involved in a nickel transport system, probably represents the nickel binder. 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 Escherichia coli and related bacteria require nickel for the synthesis of hydrogenases, enzymes involved in hydrogen oxidation and proton reduction. Nickel transport to the cytoplasm depends on five proteins, NikA-E. We have previously reported the three-dimensional structure of the soluble periplasmic nickel transporter NikA in a complex with FeEDTA(H 2O) (-). We have now determined the structure of EDTA-free NikA and have found that it binds a small organic molecule that contributes three ligands to the coordination of a transition metal ion. Unexpectedly, His416, which was far from the metal-binding site in the FeEDTA(H 2O) (-)-NikA complex, becomes the fourth observed ligand to the metal. The best match to the omit map electron density is obtained for butane-1,2,4-tricarboxylate (BTC). Our attempts to obtain a BTC-Ni-NikA complex using apo protein and commercial reagents resulted in nickel-free BTC-NikA. Overall, our results suggest that nickel transport in vivo requires a specific metallophore that may be BTC. Structural Characterization of a Putative Endogenous Metal Chelator in the Periplasmic Nickel Transporter NikA.,Cherrier MV, Cavazza C, Bochot C, Lemaire D, Fontecilla-Camps JC Biochemistry. 2008 Sep 23;47(38):9937-9943. Epub 2008 Aug 30. PMID:18759453 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ABC transporter 3D structures

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