2vov

An oxidized tryptophan facilitates copper-binding in Methylococcus capsulatus secreted protein MopE. The structure of wild-type MopE to 1.35AA

spinqualitylabelsall models 2vov, resolution 1.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2vov is a 1 chain structure with sequence from Methylococcus capsulatus str. Bath. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.35Å Ligands: CA, CU, KYN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function G1UBC6_METCA Publication Abstract from PubMed Proteins can coordinate metal ions with endogenous nitrogen and oxygen ligands through backbone amino and carbonyl groups, but the amino acid side chains coordinating metals do not include tryptophan. Here we show for the first time the involvement of the tryptophan metabolite kynurenine in a protein metal-binding site. The crystal structure to 1.35A of MopE(*) from the methane-oxidizing Methylococcus capsulatus (Bath) provided detailed information about its structure and mononuclear copper-binding site. MopE(*) contains a novel protein fold of which only one-third of the structure displays similarities to other known folds. The geometry around the copper ion is distorted tetrahedral with one oxygen ligand from a water molecule, two histidine imidazoles (His-132 and His-203), and at the fourth distorted tetrahedral position, the N1 atom of the kynurenine, an oxidation product of Trp-130. Trp-130 was not oxidized to kynurenine in MopE(*) heterologously expressed in Escherichia coli, nor did this protein bind copper. Our findings indicate that the modification of tryptophan to kynurenine and its involvement in copper binding is an innate property of M. capsulatus MopE(*). An Oxidized Tryptophan Facilitates Copper Binding in Methylococcus capsulatus-secreted Protein MopE.,Helland R, Fjellbirkeland A, Karlsen OA, Ve T, Lillehaug JR, Jensen HB J Biol Chem. 2008 May 16;283(20):13897-904. Epub 2008 Mar 18. PMID:18348978 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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