2jah

Biochemical and structural analysis of the Clavulanic acid dehydeogenase (CAD) from Streptomyces clavuligerus

spinqualitylabelsall models 2jah, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jah is a 4 chain structure with sequence from Streptomyces clavuligerus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: MSE, NDP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 The ultimate step in the biosynthesis of the medicinally important beta-lactamase inhibitor clavulanic acid is catalyzed by clavulanic acid dehydrogenase (CAD). CAD is responsible for the NAPDH-dependent reduction of the unstable intermediate clavulanate-9-aldehyde to yield clavulanic acid. Here, we report biochemical and structural studies on CAD. Biophysical analyses demonstrate that CAD exists as dimeric and tetrameric species in solution. The reaction performed by CAD was shown to be reversible, allowing the use of clavulanic acid for activity analyses. The crystal structure of CAD was solved using single-wavelength anomalous diffraction with a seleno-methionine derivative. The structure reveals that the individual monomers comprise a single domain possessing the Rossmann fold, characteristic of dinucleotide-binding enzymes. The monomers are arranged as tetramers, similar to other tetrameric members of the short-chain dehydrogenase/reductase family. The structure of the unreactive complex of CAD with clavulanic acid and NADPH suggests how CAD is able to catalyze the reduction of clavulanate-9-aldehyde without fragmentation of the bicyclic beta-lactam ring structure. The relative positions of NADPH and clavulanic acid, in the active site, together with the presence of the latter in an eclipsed conformation, rationalizes previous labeling studies demonstrating that the incorporation of the C5 pro-R, but not pro-S, hydrogen of ornithine/arginine into the C9 position of clavulanic acid occurs with overall inversion of configuration. Clavulanic acid dehydrogenase: structural and biochemical analysis of the final step in the biosynthesis of the beta-lactamase inhibitor clavulanic acid.,MacKenzie AK, Kershaw NJ, Hernandez H, Robinson CV, Schofield CJ, Andersson I Biochemistry. 2007 Feb 13;46(6):1523-33. Epub 2007 Jan 19. PMID:17279617 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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