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AS2077715 is a novel antifungal metabolite produced by the newly isolated fungal strain Capnodium sp. 339855. This compound has an analogous structure to funiculosin, an inhibitor of mitochondrial cytochrome bc1 complex (complex III). AS2077715 inhibited ubiquinol-cytochrome c reductase activity of Trichophyton mentagrophytes complex III with an IC50 of 0.9 ng ml(-1), while 6000-20,000 ng ml(-1) AS2077715 was required to obtain comparable inhibition of mammalian complex III. This inhibitor also suppressed the growth of T. mentagrophytes with a MIC of 0.08 μg ml(-1), while cytotoxicity for mammalian cells was &gt;6 μg ml(-1). These results indicate that AS2077715 is a selective inhibitor of fungal mitochondrial complex III. AS2077715 in doses of 1 μg ml(-1) or greater showed fungicidal activity against T. mentagrophytes within 2 h of incubation. This early-onset effect of fungicidal activity was also exhibited by other complex III inhibitors. These results suggest that inhibition of complex III is a promising strategy for designing anti-Trichophyton agents and that AS2077715 can be a potential drug candidate for treating Trichophyton infections.

AS2077715 is a selective inhibitor of fungal mitochondrial cytochrome bc1 complex