Aniruddha Raychaudhuri

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The enzyme RhlI catalyzes the formation of N-butyrylhomoserine lactone from S-adenosylmethionine and N-butyrylacyl carrier protein. N-Butyrylhomoserine lactone serves as a quorum-sensing signal molecule in Pseudomonas aeruginosa, and is implicated in the regulation of many processes involved in bacterial virulence and infectivity. The P. aeruginosa genome(More)
Based upon the phenotype of young, dark-grown seedlings, a cytokinin-resistant mutant, cnr1, has been isolated, which displays altered cytokinin- and auxin-induced responses. The mutant seedlings possess short hypocotyls and open apical hooks (in dark), and display agravitropism, hyponastic cotyledons, reduced shoot growth, compact rosettes and short roots(More)
The gene encoding hydroxyisourate hydrolase, a novel ureide-metabolizing enzyme, has been cloned from soybean (Glycine max). The gene encodes a protein that is 560 amino acids in length and contains a 31-amino acid signal sequence at the N terminus that is not present in the mature protein. The presence of two SKL motifs near the C terminus suggests that(More)
Alginate is a major constituent of mature biofilms produced by Pseudomonas aeruginosa. The penultimate step in the biosynthesis of alginate is the conversion of some beta-D-mannuronate residues in the polymeric substrate polymannuronan to alpha-L-guluronate residues in a reaction catalyzed by C5-mannuronan epimerase. Specificity studies conducted with(More)
Hydroxyisourate hydrolase is a recently discovered enzyme that participates in the ureide pathway in soybeans. Its role is to catalyze the hydrolysis of 5-hydroxyisourate, the product of the urate oxidase reaction. There is extensive sequence homology between hydroxyisourate hydrolase and retaining glycosidases; in particular, the conserved active site(More)
The formation of N-butyrylhomoserine lactone catalyzed by RhlI has been investigated by transient-state kinetic methods. A single intermediate, assigned to N-butyryl- S-adenosylmethionine, was observed. Under single-turnover conditions, the intermediate formed with a rate constant of 4.0 +/- 0.2 s (-1) and decayed with a rate constant of 3.7 +/- 0.2 s (-1).(More)