2o7f
From Proteopedia
(New page: 200px<br /><applet load="2o7f" size="350" color="white" frame="true" align="right" spinBox="true" caption="2o7f, resolution 2.0Å" /> '''Tyrosine ammonia-lyas...) |
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==Overview== | ==Overview== | ||
| - | Aromatic amino acid ammonia-lyases catalyze the deamination of L-His, L-Phe, and L-Tyr, yielding ammonia plus aryl acids bearing an | + | 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. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Rhodobacter sphaeroides]] | [[Category: Rhodobacter sphaeroides]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Baiga, T | + | [[Category: Baiga, T J.]] |
| - | [[Category: Bowman, M | + | [[Category: Bowman, M E.]] |
| - | [[Category: Louie, G | + | [[Category: Louie, G V.]] |
| - | [[Category: Moffitt, M | + | [[Category: Moffitt, M C.]] |
| - | [[Category: Moore, B | + | [[Category: Moore, B S.]] |
| - | [[Category: Noel, J | + | [[Category: Noel, J P.]] |
[[Category: HC4]] | [[Category: HC4]] | ||
[[Category: methylidene imidazolone prosthetic group]] | [[Category: methylidene imidazolone prosthetic group]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:15:18 2008'' |
Revision as of 16:15, 21 February 2008
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Tyrosine ammonia-lyase from Rhodobacter sphaeroides (His89Phe variant), complexed with coumaric acid
Overview
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.
About this Structure
2O7F is a Single protein structure of sequence from Rhodobacter sphaeroides with as ligand. Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Thu Feb 21 18:15:18 2008
