Structural highlights
4jd5 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.
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| Ligands: | , , , |
| Related: | 4gpe, 4gm4, 4gg1, 4gm1, 4gm0, 4gp9 |
| 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[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Andrews FH, Tom AR, Gunderman PR, Novak WR, McLeish MJ. A bulky hydrophobic residue is not required to maintain the v-conformation of enzyme-bound thiamin diphosphate. Biochemistry. 2013 May 7;52(18):3028-30. doi: 10.1021/bi400368j. Epub 2013 Apr, 23. PMID:23607689 doi:10.1021/bi400368j
