Abstract
A method for selecting tetracycline- or chloramphenicol-sensitive Escherichia coli cells from a population of predominantly resistant cells is described. This method depends on the inability of drug-sensitive cells to induce lambda receptors in the presence of chloramphenicol or tetracycline, protein synthesis-inhibiting drugs. The addition of bacteriophage lambda vir to a mixture of drug-sensitive and drug-resistant cells, induced for lambda receptors in the presence of tetracycline or chloramphenicol, preferentially kills the drug-resistant cells (which are capable of inducing lambda receptors). The result is a culture enriched for the sensitive cells. Several common strains used for transformation were compared for their ability to be selected. E. coli 294 was found to be superior.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Bochner B. R., Huang H. C., Schieven G. L., Ames B. N. Positive selection for loss of tetracycline resistance. J Bacteriol. 1980 Aug;143(2):926–933. doi: 10.1128/jb.143.2.926-933.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Bolivar F., Rodriguez R. L., Greene P. J., Betlach M. C., Heyneker H. L., Boyer H. W., Crosa J. H., Falkow S. Construction and characterization of new cloning vehicles. II. A multipurpose cloning system. Gene. 1977;2(2):95–113. [PubMed] [Google Scholar]
- Cohen S. N., Chang A. C., Hsu L. Nonchromosomal antibiotic resistance in bacteria: genetic transformation of Escherichia coli by R-factor DNA. Proc Natl Acad Sci U S A. 1972 Aug;69(8):2110–2114. doi: 10.1073/pnas.69.8.2110. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Cohen S. N., Chang A. C. Recircularization and autonomous replication of a sheared R-factor DNA segment in Escherichia coli transformants. Proc Natl Acad Sci U S A. 1973 May;70(5):1293–1297. doi: 10.1073/pnas.70.5.1293. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Maloy S. R., Nunn W. D. Selection for loss of tetracycline resistance by Escherichia coli. J Bacteriol. 1981 Feb;145(2):1110–1111. doi: 10.1128/jb.145.2.1110-1111.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ryter A., Shuman H., Schwartz M. Intergration of the receptor for bacteriophage lambda in the outer membrane of Escherichia coli: coupling with cell division. J Bacteriol. 1975 Apr;122(1):295–301. doi: 10.1128/jb.122.1.295-301.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]