Direct selection of a specifically blocked mutant of Actinomadura brunnea. Isolation of a third 8-methoxy substituted chlortetracycline.

Direct selection of a specifically blocked mutant of Actinomadura brunnea. Isolation of a third 8-methoxy substituted chlortetracycline. Biosynthesis of the tetracyclines. XII. Anhydrodemethylchlortetracycline from a mutant of Streptomyces aureofaciens Production of new anthracycline antibiotics by microbial 4-O-methylation using a specific daunorubicin-negative mutant. Dactylocyclines, novel tetracycline derivatives produced by a Dactylosporangium sp. I. Taxonomy, production, isolation and biological activity. Isolation and Characterization of Streptomyces venezuelae Mutants Blocked in Chloramphenicol Biosynthesis Anthracycline metabolites from baumycin-producing Streptomyces sp. D788. I. Isolation of antibiotic-blocked mutants and their characterization. 6-Deoxy-8-O-methylrabelomycin and 8-O-methylrabelomycin from a Streptomyces species. Isolation of 2-acetyl-2-decarboxamidotetracycline from cultures ofStreptomyces psammoticus Biosynthesis of tetracyclines. X. Protetrone Iterative Methylation Leads to 3-Methylchuangxinmycin Production in Actinoplanes tsinanensis CPCC 200056