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J. Bacteriol., Jan 1997, 122-127, Vol 179, No. 1
SH Oh and KF Chater
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.
Copyright © 1997, American Society for Microbiology
Denaturation of circular or linear DNA facilitates targeted integrative transformation of Streptomyces coelicolor A3(2): possible relevance to other organisms
Department of Genetics, John Innes Centre, Colney, Norwich, United Kingdom.
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