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The biosynthesis of chlorothricin (I), a macrolide antibiotic isolated from Streptomyces antibioticus Tü 99, has been studied by feeding experiments with 14C- and 3H-labeled precursors. Acetate and propionate, but not methionine and mevalonate, were incorporated into the macrocylic aglycone of the antibiotic. Glucose and the various carbon atoms of tyrosine, except the carboxyl carbon, also contributed label to the aglycone. Glucose also seems to be a specific precursor of the 2-deoxyrhamnose moiety, probably via a process involving a hydrogen shift from C-4 to C-6 of the hexose. The substituted 6-methylsalicylic acid moiety seems to be derived from acetate and one O-methyl group provided by methionine; shikimic acid is not incorporated.
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