2o7e
Tyrosine ammonia-lyase from Rhodobacter sphaeroides (His89Phe variant), bound to 2-aminoindan-2-phosphonic acidTyrosine ammonia-lyase from Rhodobacter sphaeroides (His89Phe variant), bound to 2-aminoindan-2-phosphonic acid
Structural highlights
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 PubMedAromatic 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. Structural determinants and modulation of substrate specificity in phenylalanine-tyrosine ammonia-lyases.,Louie GV, Bowman ME, Moffitt MC, Baiga TJ, Moore BS, Noel JP Chem Biol. 2006 Dec;13(12):1327-38. PMID:17185228[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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