The elusive structure of malleobactin, a virulence factor of pathogens belonging to the Burkholderia mallei family, was finally unveiled by genetic and chemical analyses. The novel nitro-substituted siderophore is derived from an unusual, unprotected hydroxylamine, which undergoes spontaneous oxidation, as shown by in vitro assays and detection of analogues featuring hydroxylamino, nitroso, and azoxide groups.
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