Tetrocarcins, novel antitumor antibiotics. I. Producing organism, fermentation and antimicrobial activity.

Abstract
A novel antitumor antibiotic complex was obtained from the culture broth of Actinomycete strain DO-11 (KY11091) isolated from a soil sample collected in Sendai, Miyagi, Japan. On the taxonomic studies the producing organism is described as Micromonospora chalcea KY11091. For the production of the antibiotics, soluble starch served as a good C source and yeast extract was the best N source tested. The antibiotic complex designated as tetrocarcins is active against gram-positive bacteria, but is not active against gram-negative bacteria. Tetrocarcin A showed bacteriocidal activity against Bacillus subtilis.

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