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Transfer of RP4::Mu to Salmonella typhimurium
Journal of General Microbiology
|May 1, 1981
Abstract:
Restriction-proficient strains of Salmonella typhimurium are shown to be ineffective as recipients of normal RP4::Mucts62 due to the operation of two restriction systems (hsdSA and hsdLT) on the Mu moiety of this plasmid. Strains mutant in both these hsd loci are excellent recipients.
Insights
Restriction-proficient Salmonella typhimurium strains are poor recipients for RP4::Mucts62 plasmids. Mutations in the hsdSA and hsdLT restriction systems of the Mu moiety enable efficient plasmid uptake.
Area of Science:
- Microbiology
- Bacteriology
- Molecular Biology
Background:
- Salmonella typhimurium possesses multiple restriction systems that can impede foreign DNA uptake.
- Bacteriophage Mu (Mu) integrated into plasmids can be subject to host restriction mechanisms.
Purpose of the Study:
- To investigate the role of Salmonella typhimurium restriction systems in the recipient ability for RP4::Mucts62 plasmids.
- To identify genetic modifications in Salmonella typhimurium that enhance plasmid transformation.
Main Methods:
- Transformation assays using wild-type and mutant Salmonella typhimurium strains.
- Utilizing RP4::Mucts62 plasmid carrying the Mu moiety.
- Genetic analysis of hsdSA and hsdLT loci.
Main Results:
- Restriction-proficient Salmonella typhimurium strains demonstrated low efficiency in receiving RP4::Mucts62.
- The Mu moiety of the plasmid is targeted by the hsdSA and hsdLT restriction systems.
- Strains with mutations in both hsdSA and hsdLT loci showed significantly improved recipient capabilities.
Conclusions:
- The hsdSA and hsdLT restriction systems of Salmonella typhimurium are key determinants of RP4::Mucts62 plasmid recipient efficiency.
- Disabling these restriction systems is crucial for successful genetic manipulation of Salmonella typhimurium with Mu-containing plasmids.