Incorporation of L-Leucine-C14 into Tyrocidine by a Cell-free Preparation of Bacillus brevis Dubos Strain*

Abstract
Radioactive labelling showed that the compound formed by strain of Bacillus brevis from incorporation of leucine was tyrocidine, a main component of the antibiotic tyrothricin. The results suggest that tyrocidine is synthesized by a mechanism different from that of protein biosynthesis.