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. 1987 Mar;169(3):1205–1211. doi: 10.1128/jb.169.3.1205-1211.1987

Plasmid marker rescue transformation proceeds by breakage-reunion in Bacillus subtilis.

Y Weinrauch, D Dubnau
PMCID: PMC211920  PMID: 3029025

Abstract

Bacillus subtilis carrying a plasmid which replicates with a copy number of about 1 was transformed with linearized homologous plasmid DNA labeled with the heavy isotopes 2H and 15N, in the presence of 32Pi and 6-(p-hydroxyphenylazo)-uracil to inhibit DNA replication. Plasmid DNA was isolated from the transformed culture and fractionated in cesium chloride density gradients. The distribution of total and donor plasmid DNA was examined, using specific hybridization probes. The synthesis of new DNA, associated with the integration of donor moiety, was also monitored. Donor-specific sequences were present at a density intermediate between that of light and hybrid DNA. This recombinant DNA represented 1.4% of total plasmid DNA. The latter value corresponded well with the transforming activity (1.7%) obtained for the donor marker. Newly synthesized material associated with plasmid DNA at the recombinant density amounted to a minor portion of the recombinant plasmid DNA. These data suggest that, like chromosomal transformation, plasmid marker rescue transformation does not require replication for the integration of donor markers and, also like chromosomal transformation, proceeds by a breakage-reunion mechanism. The extent of donor DNA replacement of recipient DNA per plasmid molecule of 54 kilobases (27 kilobase pairs) was estimated as 16 kilobases.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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