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• W2155655994 abstract "The Vibrio cholerae siderophore vibriobactin is biosynthesized from three molecules of 2,3-dihydroxybenzoate (DHB), two molecules of L-threonine, and one of norspermidine. Of the four genes positively implicated in vibriobactin biosynthesis, we have here expressed, purified, and assayed the products of three: vibE, vibB, and vibH. All three are homologous to nonribosomal peptide synthetase (NRPS) domains: VibE is a 2,3-dihydroxybenzoate-adenosyl monophosphate ligase, VibB is a bifunctional isochorismate lyase-aryl carrier protein (ArCP), and VibH is a novel amide synthase that represents a free-standing condensation (C) domain. VibE and VibB are homologous to EntE and EntB from Escherichia coli enterobactin synthetase; VibE activates DHB as the acyl adenylate and then transfers it to the free thiol of the phosphopantetheine arm of VibB's ArCP domain. VibH then condenses this DHB thioester (the donor) with the small molecule norspermidine (the acceptor), forming N(1)-(2, 3-dihydroxybenzoyl)norspermidine (DHB-NSPD) with a k(cat) of 600 min(-1) and a K(m) for acyl-VibB of 0.88 microM and for norspermidine of 1.5 mM. Exclusive monoacylation of a primary amine of norspermidine was observed. VibH also tolerates DHB-acylated EntB and 1,7-diaminoheptane, octylamine, and hexylamine as substrates, albeit at lowered catalytic efficiencies. DHB-NSPD possesses one of three acylations required for mature vibriobactin, and its formation confirms VibH's role in vibriobactin biosynthesis. VibH is a unique NRPS condensation domain that acts upon an upstream carrier-protein-bound donor and a downstream amine, turning over a soluble amide product, in contrast to an archetypal NRPS-embedded C domain that condenses two carrier protein thioesters." @default.
• W2155655994 created "2016-06-24" @default.
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• W2155655994 date "2000-11-22" @default.
• W2155655994 modified "2023-10-12" @default.
• W2155655994 title "Vibriobactin Biosynthesis in <i>Vibrio cholerae</i>: VibH Is an Amide Synthase Homologous to Nonribosomal Peptide Synthetase Condensation Domains" @default.
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• W2155655994 doi "https://doi.org/10.1021/bi001651a" @default.
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