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To facilitate molecular genetic studies of Streptomyces ambofaciens that produces spiramycin, a commercially important macrolide antibiotic used in human medicine against Gram-positive pathogenic bacteria, the conditions for the conjugal transfer of DNA from E. coli to S. ambofaciens were established using a bacteriophage ϕC31 att/int system. The transconjugation efficiency of S. ambofaciens varied...
A gene encoding a γ-butyrolactone autoregulator receptor was cloned in to E. coli from Streptomyces ambofaciens producing spiramycin, a macrolide antibiotic used in both veterinary medicine and human medicine. A 714-bp intact receptor gene (saaR) was obtained by PCR and genomic Southern hybridization with the 100-bp PCR product as a probe. To clarify the in vivo function of saaR, a saaR-disrupted...
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