Structural determinants and modulation of substrate specificity in phenylalanine-tyrosine ammonia-lyases.
Article Details
- CitationCopy to clipboard
Louie GV, Bowman ME, Moffitt MC, Baiga TJ, Moore BS, Noel JP
Structural determinants and modulation of substrate specificity in phenylalanine-tyrosine ammonia-lyases.
Chem Biol. 2006 Dec;13(12):1327-38.
- PubMed ID
- 17185228 [ View in PubMed]
- Abstract
Aromatic amino acid ammonia-lyases catalyze the deamination of L-His, L-Phe, and L-Tyr, yielding ammonia plus aryl acids bearing an alpha,beta-unsaturated propenoic acid. We report crystallographic analyses of unliganded Rhodobacter sphaeroides tyrosine ammonia-lyase (RsTAL) and RsTAL bound to p-coumarate and caffeate. His 89 of RsTAL forms a hydrogen bond with the p-hydroxyl moieties of coumarate and caffeate. His 89 is conserved in TALs but replaced in phenylalanine ammonia-lyases (PALs) and histidine ammonia-lyases (HALs). Substitution of His 89 by Phe, a characteristic residue of PALs, yields a mutant with a switch in kinetic preference from L-Tyr to L-Phe. Structures of the H89F mutant in complex with the PAL product, cinnamate, or the PAL-specific inhibitor, 2-aminoindan-2-phosphonate (AIP), support the role of position 89 as a specificity determinant in the family of aromatic amino acid ammonia-lyases and aminomutases responsible for beta-amino acid biosynthesis.