Targeted Discovery of the Polyene Macrolide Hexacosalactone A from Streptomyces by Reporter-Guided Selection of Fermentation Media.

New approaches are still needed to fully explore the biosynthetic potential of microbes. We recently devised a melC reporter-guided fermentation media screening approach for targeted activation of cryptic gene clusters. Using this approach, we successfully activated the expression of the hcl gene cluster in Streptomyces sp. LZ35 and discovered a novel polyene macrolide hexacosalactone A (1).