1887

Abstract

serotype O2 strains produce a catechol siderophore named vanchrobactin, which has been identified as -[′-(2,3-dihydroxybenzoyl)-arginyl]-serine. This work describes a chromosomal region that harbours the genetic determinants necessary for the biosynthesis of vanchrobactin. The authors have identified the genes involved in 2,3-dihydroxybenzoic acid (DHBA) biosynthesis (, and ) and activation (), and a gene () encoding a non-ribosomal peptide synthetase, which is putatively involved in the assembly of the siderophore components. Also described are the identification and characterization of genes encoding a putative vanchrobactin exporter () and a siderophore esterase (). In-frame deletion mutants in , , , , and were impaired for growth under conditions of iron limitation, and the analysis of culture supernatants by chrome azurol-S and cross-feeding assays showed almost no production of siderophores in any of the mutants. In addition, deletion mutations of , and abolished production of DHBA, as assessed by chemical and biological analyses. Complementation of each mutant with the corresponding gene provided confirmed the involvement of this gene cluster in the biosynthesis of DHBA and vanchrobactin in strain RV22. Based on chemical and genetic data, and on published models for other catechol siderophores, a model for vanchrobactin biosynthesis is proposed.

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2006-12-01
2020-10-25
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