2bp8

M144Q Structure of nitrite reductase from Alcaligenes xylosoxidans

spinqualitylabelsall models 2bp8, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2bp8 is a 2 chain structure with sequence from Achromobacter xylosoxidans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: CU, SO4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O68601_ALCXX 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 We present high-resolution crystal structures and functional analysis of T1Cu centre mutants of nitrite reductase that perturb the redox potential and the Cys130-His129 "hard-wired" bridge through which electron transfer to the catalytic T2Cu centre occurs. These data provide insight into how activity can be altered through mutational manipulation of the electron delivery centre (T1Cu). The alteration of Cys to Ala results in loss of T1Cu and enzyme inactivation with azurin as electron donor despite the mutant enzyme retaining full nitrite-binding capacity. These data establish unequivocally that no direct transfer of electrons occurs from azurin to the catalytic type 2 Cu centre. The mutation of the axial ligand Met144 to Leu increases both the redox potential and catalytic activity, establishing that the rate-determining step of catalysis is the intermolecular electron transfer from azurin to nitrite reductase. High resolution structural studies of mutants provide insights into catalysis and electron transfer processes in copper nitrite reductase.,Hough MA, Ellis MJ, Antonyuk S, Strange RW, Sawers G, Eady RR, Samar Hasnain S J Mol Biol. 2005 Jul 8;350(2):300-9. PMID:15927201 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nitrite reductase 3D structures

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