3hcj

Structure of MsrB from Xanthomonas campestris (oxidized form)

spinqualitylabelsall models 3hcj, resolution 1.66Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hcj is a 2 chain structure with sequence from Xanthomonas campestris pv. campestris. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.66Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8P4Q6_XANCP 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 (Msrs) are enzymes that catalyze the reduction of methionine sulfoxide back to methionine. In vivo, Msrs are essential in the protection of cells against oxidative damage to proteins and in the virulence of some bacteria. Two structurally unrelated classes of Msrs, named MsrA and MsrB, exist. MsrB are stereospecific to R epimer on the sulfur of sulfoxide. All MsrB share a common reductase step with the formation of a sulfenic acid intermediate. For the subclass of MsrB whose recycling process passes through the formation of an intradisulfide bond, the recycling reducer is thioredoxin. In the present study, X-ray structures of Neisseria meningitidis MsrB have been determined. The structures have a fold based on two beta-sheets, similar to the fold already described for other MsrB, with the recycling Cys63 located in a position favorable for disulfide bond formation with the catalytic Cys117. X-ray structures of Xanthomonas campestris MsrB have also been determined. In the C117S MsrB structure with a bound substrate, the recycling Cys31 is far from Ser117, with Trp65 being essential in the reductase step located in between. This positioning prevents the formation of the Cys31-Cys117 disulfide bond. In the oxidized structure, a drastic conformational reorganization of the two beta-sheets due to withdrawal of the Trp65 region from the active site, which remains compatible with an efficient thioredoxin-recycling process, is observed. The results highlight the remarkable structural malleability of the MsrB fold. Methionine sulfoxide reductase B displays a high level of flexibility.,Ranaivoson FM, Neiers F, Kauffmann B, Boschi-Muller S, Branlant G, Favier F J Mol Biol. 2009 Nov 20;394(1):83-93. Epub 2009 Sep 4. PMID:19733575 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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