Geninthiocin A is a cyclic thiopeptide bacterial metabolite originally isolated from Streptomyces sp. DD84. It is active against a variety of Gram-positive bacteria (MICs = 0.2-4 μg/ml), the Gram-negative bacterium C. violaceum (MIC = 19 μg/ml), and the fungus M. hiemalis (MIC = 38 μg/ml). Geninthiocin A also induces tipA promoter transcription with a minimum induction concentration of 1.2 ng/ml.
Geninthiocin, a thiopeptide antibiotic isolated from a Streptomyces sp., is a potent activator of the tipA gene, a bacterial transcription regulator involved in multidrug resistance. Geninthiocin displays a 10-fold selectivity for bacteria over mammalian cells lines, whereas the related dedialanyl geninthiocin shows the reverse selectivity. Geninthiocin is closely related to siomycin, a recently discovered inhibitor of oncogenic transcription factor, FoxM1.
