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>Novel South African Rare Actinomycete Kribbellaspeibonae Strain SK5: A Prolific Producer of Hydroxamate Siderophores including New Dehydroxylated Congeners
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Novel South African Rare Actinomycete Kribbellaspeibonae Strain SK5: A Prolific Producer of Hydroxamate Siderophores including New Dehydroxylated Congeners
In this paper, we report on the chemistry of the rare South African Actinomycete strain SK5, a prolific producer of hydroxamate siderophores and their congeners. Two new analogues, dehydroxylated desferrioxamines, speibonoxamine and desoxy-desferrioxamine D , have been isolated, together with four known hydroxamates, desferrioxamine D , desferrioxamine B , desoxy-nocardamine and nocardamine , and a diketopiperazine (DKP) . The structures of – were characterized by the analysis of HRESIMS and 1D and 2D NMR data, as well as by comparison with the relevant literature. Three new dehydroxy desferrioxamine derivatives – were tentatively identified in the molecular network of strain SK5 extracts, and structures were proposed based on their MS/MS fragmentation patterns. A plausible biosynthetic pathway was proposed. To the best of our knowledge, this is the first report of the isolation of desferrioxamines from the actinobacterial genus .
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