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In vitro insertion of the lambda attachment site into the plasmid RP4.
Molecular & General Genetics : MGG
|January 1, 1979
Summary
Researchers created a new plasmid, RP4att lambda, by combining phage lambda DNA with the RP4 plasmid. This new construct facilitates efficient lysogenization by phage lambda, aiding in genetic studies.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Bacteriophage lambda integrates into the host genome at specific attachment sites.
- Plasmid RP4 is a conjugative plasmid with a unique EcoRI restriction site.
- Genes int and xis are crucial for lambda integration and excision.
Purpose of the Study:
- To construct a novel recombinant plasmid, RP4att lambda, for studying phage lambda integration.
- To characterize the properties of the newly engineered plasmid.
- To facilitate efficient lysogenization by specific phage lambda mutants.
Main Methods:
- Excision of the phage lambda attachment site (attP) and adjacent genes (int, xis) using EcoRI endonuclease.
- Insertion of the excised DNA fragment into the unique EcoRI site of plasmid RP4.
- Transformation of bacterial hosts with the recombinant plasmid.
- Assessment of lysogenization efficiency using phage lambda b2 with a mutant attachment site (delta attP').
Main Results:
- Successful construction of the recombinant plasmid RP4att lambda.
- RP4att lambda transformants demonstrated efficient lysogenization by phage lambda b2.
- The hybrid plasmid retains the functional phage lambda attachment site and associated genes.
Conclusions:
- The recombinant plasmid RP4att lambda is a viable tool for studying phage lambda integration and lysogeny.
- This construct enables efficient genetic manipulation and analysis of phage lambda.
- The study provides insights into the genetic elements governing phage-host interactions.