3fdd | pdb_00003fdd

The Crystal Structure of the Pseudomonas dacunhae Aspartate-Beta-Decarboxylase Reveals a Novel Oligomeric Assembly for a Pyridoxal-5-Phosphate Dependent Enzyme

spinqualitylabelsall models 3fdd, resolution 2.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3fdd is a 1 chain structure with sequence from Pseudomonas dacunhae atcc 21192. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, CL, PLP Gene: aspD, GI:28875527 (Pseudomonas dacunhae ATCC 21192) Activity: Aspartate 4-decarboxylase, with EC number 4.1.1.12 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 The Pseudomonas dacunhael-aspartate-beta-decarboxylase (ABDC, aspartate 4-decarboxylase, aspartate 4-carboxylyase, E.C. 4.1.1.12) is a pyridoxal-5'-phosphate (PLP)-dependent enzyme that catalyzes the beta-decarboxylation of l-aspartate to produce l-alanine and CO(2). This catalytically versatile enzyme is known to form functional dodecamers at its optimal pH and is thought to work in conjunction with an l-Asp/l-Ala antiporter to establish a proton gradient across the membrane that can be used for ATP biosynthesis. We have solved the atomic structure of ABDC to 2.35 A resolution using single-wavelength anomalous dispersion phasing. The structure reveals that ABDC oligomerizes as a homododecamer in an unknown mode among PLP-dependent enzymes and has highest structural homology with members of the PLP-dependent aspartate aminotransferase subfamily. The structure shows that the ABDC active site is very similar to that of aspartate aminotransferase. However, an additional arginine side chain (Arg37) was observed flanking the re-side of the PLP ring in the ABDC active site. The mutagenesis results show that although Arg37 is not required for activity, it appears to be involved in the ABDC catalytic cycle. The crystal structure of the Pseudomonas dacunhae aspartate-beta-decarboxylase dodecamer reveals an unknown oligomeric assembly for a pyridoxal-5'-phosphate-dependent enzyme.,Lima S, Sundararaju B, Huang C, Khristoforov R, Momany C, Phillips RS J Mol Biol. 2009 Apr 24;388(1):98-108. Epub 2009 Mar 2. PMID:19265705 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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