title: Crystallization and preliminary X-ray analysis of PaaAC, the main component of the hydroxylase of the Escherichia coli phenylacetyl-coenzyme A oxygenase complex.
abstract: The Escherichia coli paa operon encodes enzymes of the phenylacetic acid-utilization pathway that metabolizes phenylacetate in the form of a coenzyme A (CoA) derivative. The phenylacetyl-coenzyme A oxygenase complex, which has been postulated to contain five components designated PaaABCDE, catalyzes ring hydroxylation of phenylacetyl-CoA. The PaaAC subcomplex shows low sequence similarity to other bacterial multicomponent monooxygenases (BMMs) and forms a separate branch on the phylogenetic tree. PaaAC, which catalyzes the hydroxylation reaction, was purified and crystallized in the absence of a bound ligand as well as in complexes with CoA, 3-hydroxybutyryl-CoA, benzoyl-CoA and the true substrate phenylacetyl-CoA. Crystals of the ligand-free enzyme belonged to space group P2(1)2(1)2(1) and diffracted to 2.65 A resolution, whereas complexes with CoA and its derivatives crystallized in space group P4(1)2(1)2 and diffracted to approximately 2.0 A resolution. PaaAC represents the first crystallized BMM hydroxylase that utilizes a CoA-linked substrate.
authors.affiliation: Department of Biochemistry, McGill University, Montréal, Québec, Canada.
authors.forename: Andrey M
authors.initials: AM
authors.lastname: Grishin
authors.forename: Eunice
authors.initials: E
authors.lastname: Ajamian
authors.forename: Linhua
authors.initials: L
authors.lastname: Zhang
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Cygler
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins / Q000737:chemistry*; D006899:Mixed Function Oxygenases / Q000737:chemistry*; D011485:Protein Binding; D013379:Substrate Specificity
chemical_list: D029968:Escherichia coli Proteins; D006899:Mixed Function Oxygenases
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