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recA-dependent recombination between rRNA operons generates type II F' plasmids.
Journal of Bacteriology
|December 1, 1983
Summary
The formation of type II F' plasmids in Salmonella typhimurium involves general recombination between ribosomal RNA (rrn) repeats. This process explains how these specific plasmids arise from Hfr strains.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- Salmonella typhimurium is a key model organism in bacterial genetics.
- F' plasmids carry specific chromosomal genes and are important for genetic transfer.
- Hfr strains are known for their ability to transfer chromosomal DNA.
Purpose of the Study:
- To elucidate the mechanism of type II F-prime (F") plasmid formation.
- To understand the role of recombination in plasmid genesis from Hfr strains.
Main Methods:
- Analysis of plasmid formation in Salmonella typhimurium Hfr strain SA722.
- Investigating the genetic basis of F' plasmid generation.
Main Results:
- Type II F' ilv cya metE plasmids are formed through general recombination.
- The recombination occurs specifically between repeated ribosomal RNA (rrn) operons.
Conclusions:
- General recombination between rrn repeats is the mechanism for type II F' plasmid formation in this Salmonella strain.
- This finding clarifies the origin of specific F' plasmids in Hfr strains.