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2o7d

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{{STRUCTURE_2o7d| PDB=2o7d | SCENE= }}
{{STRUCTURE_2o7d| PDB=2o7d | SCENE= }}
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'''Tyrosine ammonia-lyase from Rhodobacter sphaeroides, complexed with caffeate'''
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===Tyrosine ammonia-lyase from Rhodobacter sphaeroides, complexed with caffeate===
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==Overview==
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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.
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{{ABSTRACT_PUBMED_17185228}}
==About this Structure==
==About this Structure==
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[[Category: Noel, J P.]]
[[Category: Noel, J P.]]
[[Category: Methylidene imidazolone prosthetic group]]
[[Category: Methylidene imidazolone prosthetic group]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 10:24:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:07:50 2008''

Revision as of 16:07, 27 July 2008

Image:2o7d.png

Template:STRUCTURE 2o7d

Tyrosine ammonia-lyase from Rhodobacter sphaeroides, complexed with caffeate

Template:ABSTRACT PUBMED 17185228

About this Structure

2O7D is a Single protein structure of sequence from Rhodobacter sphaeroides. 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

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