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Microbiology 142 (1996), 2363-2373
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microbiology, Vol 142, 2363-2373, Copyright © 1996 by Society for General Microbiology

ARTICLES

Gene transfer and transposition mutagenesis in Streptomyces roseosporus: mapping of insertions that influence daptomycin or pigment production

MA McHenney and RH Baltz
Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285, USA.

Streptomyces reseosporus, the producer of the cyclic lipopeptide antibiotic daptomycin, was shown to be a suitable host for molecular genetic manipulation. S. roseosporus does not appear to express significant restriction barriers based upon bacteriophage plaque formation studies. Plasmid DNA can be introduced into S. roseosporus by bacteriophage-FP43-mediated transduction and by conjugation from Escherichia coli. The streptomycete transposons Tn5096 and Tn5099, derived from IS493, transpose in S. roseosporus, and Tn5099-induced transposition mutants altered in the production of daptomycin, red pigment or black pigment were identified, and mapped to Dral and Asnl fragments. Three auxotrophic mutations (argB1, ade-1 and metB1) were identified among 100 individual Tn5096 insertions. Alignment and physical mapping of several Tn5099 insertions in Dral-E and Asnl-B fragments was facilitated by the presence of Dral and Asnl cleavage sites in Tn5099.


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