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. 1980 Nov;144(2):698–709. doi: 10.1128/jb.144.2.698-709.1980

Genetic transformation of Streptococcus pneumoniae by heterologous plasmid deoxyribonucleic acid.

F Barany, A Tomasz
PMCID: PMC294720  PMID: 6253440

Abstract

A number of heterologous plasmid deoxyribonucleic acids (DNAs) coding for erythromycin, tylosin, lincomycin, tetracycline, or chloramphenicol resistance have been introduced into Streptococcus pneumoniae via genetic transformation with frequencies that varied between 10(-5) to as high as 5 x 10(-1) per colony-forming unit. Transformation with plasmid DNA required pneumococcal competence, was competed by chromosomal DNA, and showed a saturation at about 0.5 micrograms/ml (with a recipient population of 3 x 10(7) colony-forming units of competent cells per ml). Plasmid transformation did not occur with a recipient strain, 410, defective in endonuclease I activity and in chromosomal genetic transformation. All erythromycin-resistant transformants examined contained covalently closed circular DNA with the same electrophoretic mobility on agarose gels as the donor DNAs, and when examined in detail the plasmid reisolated from the transformants had the same restriction patterns and the same specific transforming activity as the donor DNA. In the cases of two plasmids examined in detail--pAM77 and pSA5700 Lc9--most of the transforming activity was associated with DNA monomers; DNA multimers present in pSA5700 Lc9 also had biological activity. An unexpected finding was the demonstration of transformation (2 x 10(-5) per colony-forming unit) with plasmid DNAs linearized by treatment with S1 nuclease or with restriction endonucleases.

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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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