4gm0 | pdb_00004gm0

Crystal Structure of Benzoylformate Decarboxylase Mutant L403N

spinqualitylabelsall models 4gm0, resolution 1.07Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4gm0 is a 1 chain structure with sequence from Pseudomonas putida. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, GOL, NA, TZD Related: 4gg1, 4gm4, 4gm1 Gene: mdlC (Pseudomonas putida) Activity: Benzoylformate decarboxylase, with EC number 4.1.1.7 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed It is widely accepted that, in thiamin diphosphate (ThDP)-dependent enzymes, much of the rate acceleration is provided by the cofactor. Inter alia, the reactive conformation of ThDP, known as the V-conformation, has been attributed to the presence of a bulky hydrophobic residue located directly below the cofactor. Here we report the use of site-saturation mutagenesis to generate variants of this residue (Leu403) in benzoylformate decarboxylase. The observed 3 orders of magnitude range in kcat/Km values suggested that conformational changes in the cofactor could be influencing catalysis. However, X-ray structures of several variants were determined, and there was remarkably little change in ThDP conformation. Rather, it seemed that, once the V-conformation was attained, residue size and hydrophobicity were more important for enzyme activity. A bulky hydrophobic residue is not required to maintain the v-conformation of enzyme-bound thiamin diphosphate.,Andrews FH, Tom AR, Gunderman PR, Novak WR, McLeish MJ Biochemistry. 2013 May 7;52(18):3028-30. doi: 10.1021/bi400368j. Epub 2013 Apr, 23. PMID:23607689 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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