Summary
Plasmid pIF132 containing two direct repeats of the mel (melanin) sequence was used to monitor intraplasmid recombination. Five mutants of Streptomyces lividans TK64 deficient in intraplasmid recombination were isolated. Four contained additional defects in aerial mycelium formation, pigmentation, and nutrient requirements; among these two showed extensive amplification of chromosomal sequences. Mutant JT46 had no pleiotropic defects but had the most severe blockage in recombination. Only one of the mutants was slightly more sensitive to UV and two were slightly more sensitive to mitomycin C. Plasmid pWCL1 (containing pIJ702, pUC12, and HBVsAg sequences; Lee et al. 1986) could not stably replicate in TK64 without spontaneous deletions. In contrast the mutant JT46 maintained the integrity of pWCL1 much more stably.
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Communicated by N.D.F. Grindley
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Tsai, J.F.Y., Chen, C.W. Isolation and characterization of Streptomyces lividans mutants deficient in intraplasmid recombination. Mole Gen Genet 208, 211–218 (1987). https://doi.org/10.1007/BF00330444
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DOI: https://doi.org/10.1007/BF00330444