3lt5
X-ray Crystallographic structure of a Pseudomonas Aeruginosa Azoreductase in complex with balsalazideX-ray Crystallographic structure of a Pseudomonas Aeruginosa Azoreductase in complex with balsalazide
Structural highlights
FunctionAZOR1_PSEAE Catalyzes the reductive cleavage of azo bond in aromatic azo compounds to the corresponding amines. Requires NADH, but not NADPH, as an electron donor for its activity (By similarity). 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 PubMedAzoreductases are important due to their ability to activate anti-inflammatory azo pro-drugs and to detoxify azo dyes. Three genes encoding azoreductases have been identified in Pseudomonas aeruginosa. We describe here a comparison of the three enzymes. The pure recombinant proteins each have a distinct substrate specificity profile against a range of azo substrates. Using the structure of P. aeruginosa azoreductase (paAzoR) 1 and the homology models of paAzoR2 and paAzoR3, we have identified residues important for substrate specificity. We have defined a novel flavin mononucleotide binding cradle, which is a recurrent motif in many flavodoxin-like proteins. A novel structure of paAzoR1 with the azo pro-drug balsalazide bound within the active site was determined by X-ray crystallography and demonstrates that the substrate is present in a hydrazone tautomer conformation. We propose that the structure with balsalazide bound represents an enzyme intermediate and, together with the flavin mononucleotide binding cradle, we propose a novel catalytic mechanism. A novel mechanism for azoreduction.,Ryan A, Laurieri N, Westwood I, Wang CJ, Lowe E, Sim E J Mol Biol. 2010 Jul 2;400(1):24-37. Epub 2010 Apr 24. PMID:20417637[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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