1l1d

Crystal structure of the C-terminal methionine sulfoxide reductase domain (MsrB) of N. gonorrhoeae pilB

spinqualitylabelsall models 1l1d, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1l1d is a 2 chain structure with sequence from Neisseria gonorrhoeae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.85Å Ligands: CAC, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MSRAB_NEIGO Has an important function as a repair enzyme for proteins that have been inactivated by oxidation (By similarity). Catalyzes the reversible oxidation-reduction of methionine sulfoxide in proteins to methionine.[HAMAP-Rule:MF_01400] 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 Methionine sulfoxide reductases (Msr) protect against oxidative damage that can contribute to cell death. The tandem Msr domains (MsrA and MsrB) of the pilB protein from Neisseria gonorrhoeae each reduce different epimeric forms of methionine sulfoxide. The overall fold of the MsrB domain revealed by the 1.85 A crystal structure shows no resemblance to the previously determined MsrA structures from other organisms. Despite the lack of homology, the active sites show approximate mirror symmetry. In each case, conserved amino acid motifs mediate the stereo-specific recognition and reduction of the substrate. Unlike the MsrA domain, the MsrB domain activates the cysteine or selenocysteine nucleophile through a unique Cys-Arg-Asp/Glu catalytic triad. The collapse of the reaction intermediate most likely results in the formation of a sulfenic or selenenic acid moiety. Regeneration of the active site occurs through a series of thiol-disulfide exchange steps involving another active site Cys residue and thioredoxin. These observations have broad implications for modular catalysis, antibiotic drug design and continuing longevity studies in mammals. The mirrored methionine sulfoxide reductases of Neisseria gonorrhoeae pilB.,Lowther WT, Weissbach H, Etienne F, Brot N, Matthews BW Nat Struct Biol. 2002 May;9(5):348-52. PMID:11938352 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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