Studies on a novel cytocidal antibiotic, trienomycin A. Taxonomy, fermentation, isolation, and physico-chemical and biological characteristics.

Abstract
A new antibiotic, trienomycin A, was isolated from the culture broth of Streptomyces sp. no. 83-16. The physico-chemical characteristics of the antibiotic suggested that it belongs to the group of ansamycin antibiotics with a triene moiety in the molecule. The molecular formula of trienomycin A is C36H50N2O7 (MW 622). The antibiotic possesses potent cytocidal activity against HeLa S3 and PLC hepatoma cells at concentration of 0.1 and 0.01 .mu.g/ml (IC50 value), respectively. Trienomycin A showed no antimicrobial activity against the bacteria, fungi and yeasts examined, with the exception of weak activity vs. Piricularia oryzae at a concentration of 1000 .mu.g/ml.