A series of large chromosomal deletions in Streptomyces hygroscopicus 10-22 were aligned on the physical map of the wild-type strain and the mutants were assessed for their ability to produce the aminocyclitol antibiotic 5102-I (jinggangmycin). Twenty-eight mutants were blocked for jinggangmycin production and all of them were found to lack a 300 kb AseI-F fragment of the wild-type chromosome. An...
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