J. Bacteriol., Jan 1997, 122-127, Vol 179, No. 1
Copyright © 1997, American Society for Microbiology
SH Oh and KF Chater
Department of Genetics, John Innes Centre, Colney, Norwich, United Kingdom.
Using Streptomyces coelicolor A3(2) protoplasts, the number of transformants obtained by homologous recombination of incoming double- stranded circular DNA with the recipient chromosome was greatly stimulated by simple denaturation of the donor DNA. This procedure was very effective with inserts over a ca. 100-fold size range, the largest tested being ca. 40-kb inserts in cosmids. These observations led to transformation experiments with linearized cloned DNA and randomly sheared genomic DNA. In both cases, DNA denaturation led to significant levels of transformation. Most of the transformants had resulted from the predicted homologous recombination events. A number of genetic manipulations will be made easier or possible by these procedures.
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