4ba4

Crystal structure of the apo omega-transaminase from Chromobacterium violaceum

spinqualitylabelsall models 4ba4, resolution 1.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ba4 is a 2 chain structure with sequence from "chromobacterium_janthinum"_(zopf)_ford_1927 "chromobacterium janthinum" (zopf) ford 1927. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 4a6r, 4a6t, 4a6u, 4a72, 4ah3, 4ba5 Activity: Beta-alanine--pyruvate transaminase, with EC number 2.6.1.18 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structures and inhibitor complexes of two industrially important omega-aminotransferase enzymes from Pseudomonas aeruginosa and Chromobacterium violaceum have been determined in order to understand the differences in their substrate specificity. The two enzymes share 30% sequence identity and use the same amino acceptor, pyruvate; however, the Pseudomonas enzyme shows activity towards the amino donor beta-alanine, whilst the Chromobacterium enzyme does not. Both enzymes show activity towards S-alpha-methylbenzylamine (MBA), with the Chromobacterium enzyme having a broader substrate range. The crystal structure of the P. aeruginosa enzyme has been solved in the holo form and with the inhibitor gabaculine bound. The C. violaceum enzyme has been solved in the apo and holo forms and with gabaculine bound. The structures of the holo forms of both enzymes are quite similar. There is little conformational difference observed between the inhibitor complex and the holoenzyme for the P. aeruginosa aminotransferase. In comparison, the crystal structure of the C. violaceum gabaculine complex shows significant structural rearrangements from the structures of both the apo and holo forms of the enzyme. It appears that the different rigidity of the protein scaffold contributes to the substrate specificity observed for the two omega-aminotransferases. Structural studies of Pseudomonas and Chromobacterium omega-aminotransferases provide insights into their differing substrate specificity.,Sayer C, Isupov MN, Westlake A, Littlechild JA Acta Crystallogr D Biol Crystallogr. 2013 Apr;69(Pt 4):564-76. doi:, 10.1107/S0907444912051670. Epub 2013 Mar 14. PMID:23519665 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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