Structure of homoplatensimide A: a potential key biosynthetic intermediate of platensimycin isolated from Streptomyces platensis

Platensimycin and platencin are novel natural product antibiotics that inhibit bacterial growth by inhibiting fatty acid biosynthesis enzymes FabF and FabF/FabH, respectively. Continued search for the natural congeners for structure activity relationship studies led to the isolation of a congener which possesses all of the twenty carbons of diterpenoid unit, a potential biosynthetic intermediate of platensic acid unit of platensimycin. Isolation, structure, and activity of homoplatensimide A and biosynthetic relationship to platensimycin have been described.