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Siderophore-microcins are antimicrobial peptides produced by enterobacteria, especially Escherichia coli and Klebsiella pneumoniae strains. The antibiotic peptide is post-translationally modified by the linkage of a siderophore moiety. Therefore, it can enter and kill phylogenetically related bacteria by a "Trojan Horse" stratagem, by mimicking the iron-siderophore complexes. Consequently, these antimicrobial peptides are key determinants of bacterial competition within the intestinal niche, which is the reservoir for pathogenic E. coli.