Pentamycin biosynthesis in PhilippineStreptomycessp. S816: Cytochrome P450-catalysed installation of the C-14 hydroxyl group
ABSTRACTPentamycin is a polyene antibiotic, registered in Switzerland for the treatment of vaginal candidiasis, trichomo-niasis and mixed infections. Chemical instability has hindered its wide-spread application and development as a drug. Here we report the identification ofStreptomycessp. S816, isolated from Philippine mangrove soil, as a pentamycin producer. Genome sequence analysis identified the putative pentamycin biosynthetic gene cluster, which shows a high degree of similarity to the gene cluster responsible for filipin III biosynthesis. TheptnJgene, which is absent from the filipin III biosynthetic gene cluster, was shown to encode a cytochrome P450 capable of converting filipin III to pentamycin. This confirms that the cluster directs pentamycin biosynthesis, paving the way for biosynthetic engineering approaches to the production of pentamycin analogues. Several otherStreptomycesgenomes were found to containptnJorthologues clustered with genes encoding polyketide synthases that appear to have similar architectures to those responsible for the assembly of filipin III and pentamycin, suggesting pentamycin production may be common inStreptomycesspecies.