2z9v

Crystal structure of pyridoxamine-pyruvate aminotransferase complexed with pyridoxamine

spinqualitylabelsall models 2z9v, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2z9v is a 2 chain structure with sequence from Mesorhizobium loti. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, PXM, SO4 Related: 2z9u, 2z9w, 2z9x Gene: mlr6806 (Mesorhizobium loti) Activity: Pyridoxamine--pyruvate transaminase, with EC number 2.6.1.30 Resources: FirstGlance, OCA, RCSB, PDBsum 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 Pyridoxamine-pyruvate aminotransferase (PPAT; EC 2.6.1.30) is a pyridoxal 5'-phosphate-independent aminotransferase and catalyzes reversible transamination between pyridoxamine and pyruvate to form pyridoxal and L-alanine. The crystal structure of PPAT from Mesorhizobium loti has been solved in space group P4(3)2(1)2 and was refined to an R factor of 15.6% (R(free) = 20.6%) at 2.0 A resolution. In addition, the structures of PPAT in complexes with pyridoxamine, pyridoxal, and pyridoxyl-L-alanine have been refined to R factors of 15.6, 15.4, and 14.5% (R(free) = 18.6, 18.1, and 18.4%) at 1.7, 1.7, and 2.0 A resolution, respectively. PPAT is a homotetramer and each subunit is composed of a large N-terminal domain, consisting of seven beta-sheets and eight alpha-helices, and a smaller C-terminal domain, consisting of three beta-sheets and four alpha-helices. The substrate pyridoxal is bound through an aldimine linkage to Lys-197 in the active site. The alpha-carboxylate group of the substrate amino/keto acid is hydrogen-bonded to Arg-336 and Arg-345. The structures revealed that the bulky side chain of Glu-68 interfered with the binding of the phosphate moiety of pyridoxal 5'-phosphate and made PPAT specific to pyridoxal. The reaction mechanism of the enzyme is discussed based on the structures and kinetics results. Crystal structure of pyridoxamine-pyruvate aminotransferase from Mesorhizobium loti MAFF303099.,Yoshikane Y, Yokochi N, Yamasaki M, Mizutani K, Ohnishi K, Mikami B, Hayashi H, Yagi T J Biol Chem. 2008 Jan 11;283(2):1120-7. Epub 2007 Nov 6. PMID:17989071 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aspartate Aminotransferase

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