Abstract
PB15 is an Hfr strain of Escherichia coli K-12. It arose from an F′ strain carrying a temperature-sensitive F-gal by an event which blocked the detachment of F-gal in the normally reversible integration process. In PB15, the detachment of F-gal by a second mechanism can now be detected: this mechanism results in the excision and transfer of extended chromosomal segments which include the integrated F-gal; the excised segments are inferred to have circularized. Their excision, which is independent of the recA+ allele, occurs at an unusually high rate during conjugation; a mutant F-initiator protein is suggested as the cause of this phenomenon. After their establishment in recipients, the enlarged F-genotes undergo further deletions of included donor genes by a process which is again recA+-independent. In Rec+, but not in Rec−, cells, a high proportion of the deleted fragments are rescued by integration into the recipient's chromosome.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- ADELBERG E. A., BURNS S. N. Genetic variation in the sex factor of Escherichia coli. J Bacteriol. 1960 Mar;79:321–330. doi: 10.1128/jb.79.3.321-330.1960. [DOI] [PMC free article] [PubMed] [Google Scholar]
- ADELBERG E. A., PITTARD J. CHROMOSOME TRANSFER IN BACTERIAL CONJUGATION. Bacteriol Rev. 1965 Jun;29:161–172. doi: 10.1128/br.29.2.161-172.1965. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Adhya S., Cleary P., Campbell A. A deletion analysis of prophage lambda and adjacent genetic regions. Proc Natl Acad Sci U S A. 1968 Nov;61(3):956–962. doi: 10.1073/pnas.61.3.956. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Anderson E. H. Growth Requirements of Virus-Resistant Mutants of Escherichia Coli Strain "B". Proc Natl Acad Sci U S A. 1946 May;32(5):120–128. doi: 10.1073/pnas.32.5.120. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Berg C. M., Curtiss R., 3rd Transposition derivatives of an Hfr strain of Escherichia coli K-12. Genetics. 1967 Jul;56(3):503–525. doi: 10.1093/genetics/56.3.503. [DOI] [PMC free article] [PubMed] [Google Scholar]
- CLARK A. J. Genetic analysis of a "double male" strain of Escherichia coli K-12. Genetics. 1963 Jan;48:105–120. doi: 10.1093/genetics/48.1.105. [DOI] [PMC free article] [PubMed] [Google Scholar]
- DeVries J. K., Maas W. K. Chromosomal integration of F' factors in recombination-deficient Hfr strains of Escherichia coli. J Bacteriol. 1971 Apr;106(1):150–156. doi: 10.1128/jb.106.1.150-156.1971. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Franklin N. C. Extraordinary recombinational events in Escherichia coli. Their independence of the rec+ function. Genetics. 1967 Apr;55(4):699–707. doi: 10.1093/genetics/55.4.699. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gottesman M. E., Yarmolinsky M. B. Integration-negative mutants of bacteriophage lambda. J Mol Biol. 1968 Feb 14;31(3):487–505. doi: 10.1016/0022-2836(68)90423-3. [DOI] [PubMed] [Google Scholar]
- Hirota Y. THE EFFECT OF ACRIDINE DYES ON MATING TYPE FACTORS IN ESCHERICHIA COLI. Proc Natl Acad Sci U S A. 1960 Jan;46(1):57–64. doi: 10.1073/pnas.46.1.57. [DOI] [PMC free article] [PubMed] [Google Scholar]
- LOW B., WOOD T. H. A QUICK AND EFFICIENT METHOD FOR INTERRUPTION OF BACTERIAL CONJUGATION. Genet Res. 1965 Jul;6:300–303. doi: 10.1017/s001667230000416x. [DOI] [PubMed] [Google Scholar]
- LURIA S. E., BURROUS J. W. Hybridization between Escherichia coli and Shigella. J Bacteriol. 1957 Oct;74(4):461–476. doi: 10.1128/jb.74.4.461-476.1957. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Low B. Formation of merodiploids in matings with a class of Rec- recipient strains of Escherichia coli K12. Proc Natl Acad Sci U S A. 1968 May;60(1):160–167. doi: 10.1073/pnas.60.1.160. [DOI] [PMC free article] [PubMed] [Google Scholar]
- TAYLOR A. L., THOMAN M. S. THE GENETIC MAP OF ESCHERICHIA COLI K-12. Genetics. 1964 Oct;50:659–677. doi: 10.1093/genetics/50.4.659. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Taylor A. L. Current linkage map of Escherichia coli. Bacteriol Rev. 1970 Jun;34(2):155–175. doi: 10.1128/br.34.2.155-175.1970. [DOI] [PMC free article] [PubMed] [Google Scholar]
- YANOFSKY C., LENNOX E. S. Transduction and recombination study of linkage relationships among the genes controlling tryptophan synthesis in Escherichia coli. Virology. 1959 Aug;8:425–447. doi: 10.1016/0042-6822(59)90046-7. [DOI] [PubMed] [Google Scholar]