Precezomycin, a novel antibiotic biosynthetic precursor of cezomycin, from actinomycete Kitasatospora putterlickiae 10–13

A novel antibiotic biosynthetic precursor of cezomycin, named precezomycin ( 1 ), was isolated from culture broth of actinomycete Kitasatospora putterlickiae 10–13. The planar structure was determined by 1D/2D NMR and HR(ESI)MS data analyses, and the absolute configurations were established by TDDFT calculation of ECD spectra. Precezomycin ( 1 ) exhibited moderate antibacterial activity against gram-positive bacteria including Staphylococcus aureus and Bacillus subtilis . The discovery of 1 extends the natural product family of cezomycin and provides a new insight into understanding the biosynthetic process of these polyether ionophore metabolites.