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. 1984 Feb;157(2):445–453. doi: 10.1128/jb.157.2.445-453.1984

Physical and genetic analyses of streptococcal plasmid pAM beta 1 and cloning of its replication region.

D J Leblanc, L N Lee
PMCID: PMC215268  PMID: 6319361

Abstract

Plasmid pAM beta 1, originally isolated from Streptococcus faecalis DS5, mediates resistance to the MLS (macrolide, lincosamide, and streptogramin B alpha) group of antibiotics. A restriction endonuclease map of the 26.5-kilobase (kb) pAM beta 1 molecule was constructed by using the enzymes AvaI, HpaII, EcoRI, PvuII, Kpn1, BstEII, HpaI, HhaI, and HindIII. A comparison of this map to those of four independently isolated deletion derivatives of pAM beta 1 located the MLS resistance determinant within a 2-kb DNA segment and at least one conjugative function within an 8-kb region. The 5.0-kb EcoRI-B fragment from pAM beta 1 was ligated onto the 4.0-kb Escherichia coli plasmid vector, pACKC1, and used to transform E. coli HB101. The 9.0-kb chimeric plasmid was then used to transform Streptococcus sanguis Challis with concurrent expression of the E. coli kanamycin resistance determinant. The 5.0-kb EcoRI-B fragment from pAM beta 1 was subsequently used as a vector to clone a streptomycin resistance determinant from a strain of Streptococcus mutans containing no detectable plasmid DNA. Subcloning experiments, using a HindIII partial digest of pAM beta 1 DNA, narrowed the replication region of this plasmid to a 2.95-kb fragment.

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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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