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. 1988 Mar;170(3):1183–1190. doi: 10.1128/jb.170.3.1183-1190.1988

Insertion of foreign DNA into plasmids from gram-positive bacteria induces formation of high-molecular-weight plasmid multimers.

A Gruss 1, S D Ehrlich 1
PMCID: PMC210890  PMID: 3125152

Abstract

Plasmids pUB110, pC194, pE194, and pT181 are commonly used as cloning vectors in both Bacillus subtilis and Staphylococcus aureus. We report that insertion of foreign DNA into any of these plasmids results in the generation of high-molecular-weight plasmid multimers (HMW) of the recombinant, present as tandem head-to-tail copies. HMW was detected in wild-type B. subtilis and S. aureus strains. The production of HMW depended on the nature of the DNA insertion. Inserts of Escherichia coli DNA, e.g., pBR322 or pUC18, resulted in large amounts of HMW, whereas some inserts of S. aureus DNA of the same size had no effect on plasmid profile. The generation of HMW depended on the mode of plasmid replication; plasmids which replicate via a single-stranded DNA intermediate produced HMW upon foreign DNA insertion, whereas plasmid pAM beta 1, which does not generate single-stranded DNA, did not generate HMW. We propose that HMW is a product of imparied termination of rolling-circle replication and that the impairment is due to the nature of the DNA insertion.

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