Abstract
Cocrystal structures of Methanococcus jannaschii diaminopimelate decarboxylase (DAPDC) bound to a substrate analog, azelaic acid, and its L-lysine product have been determined at 2.6 Å and 2.0 Å, respectively. This PLP-dependent enzyme is responsible for the final step of L-lysine biosynthesis in bacteria and plays a role in β-lactam antibiotic resistance in Staphylococcus aureus. Substrate specificity derives from recognition of the L-chiral center of diaminopimelate and a system of ionic "molecular rulers" that dictate substrate length. A coupled-enzyme assay system permitted measurement of kinetic parameters for recombinant DAPDCs and inhibition constants (Ki) for azelaic acid (89 μM) and other substrate analogs. Implications for rational design of broad-spectrum antimicrobial agents targeted against DAPDCs of drug-resistant strains of bacterial pathogens, such as Staphylococcus aureus, are discussed.
Original language | English (US) |
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Pages (from-to) | 1499-1508 |
Number of pages | 10 |
Journal | Structure |
Volume | 10 |
Issue number | 11 |
DOIs | |
State | Published - Nov 1 2002 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Structural Biology
- Molecular Biology
Keywords
- Antibiotic resistance
- Diaminopimalate decarboxylase
- Lysine biosynthesis
- Structural genomics
- X-ray crystallography