1e5i

DELTA-R306 DEACETOXYCEPHALOSPORIN C SYNTHASE COMPLEXED WITH IRON AND 2-OXOGLUTARATE.

spinqualitylabelsall models 1e5i, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1e5i is a 1 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 2.1Å Ligands: AKG, FE2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CEFE_STRCL Catalyzes the step from penicillin N to deacetoxy-cephalosporin C. 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 Deacetoxycephalosporin C synthase (DAOCS) is an iron(II) and 2-oxoglutarate-dependent oxygenase that catalyzes the conversion of penicillin N to deacetoxycephalosporin C, the committed step in the biosynthesis of cephalosporin antibiotics. The crystal structure of DAOCS revealed that the C terminus of one molecule is inserted into the active site of its neighbor in a cyclical fashion within a trimeric unit. This arrangement has hindered the generation of crystalline enzyme-substrate complexes. Therefore, we constructed a series of DAOCS mutants with modified C termini. Oxidation of 2-oxoglutarate was significantly uncoupled from oxidation of the penicillin substrate in certain truncated mutants. The extent of uncoupling varied with the number of residues deleted and the penicillin substrate used. Crystal structures were determined for the DeltaR306 mutant complexed with iron(II) and 2-oxoglutarate (to 2.10 A) and the DeltaR306A mutant complexed with iron(II), succinate and unhydrated carbon dioxide (to 1.96 A). The latter may mimic a product complex, and supports proposals for a metal-bound CO(2) intermediate during catalysis. Kinetic and crystallographic studies on deacetoxycephalosporin C synthase (DAOCS).,Lee HJ, Lloyd MD, Harlos K, Clifton IJ, Baldwin JE, Schofield CJ J Mol Biol. 2001 May 18;308(5):937-48. PMID:11352583 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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