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Phage TP901-1 site-specific integrase functions in human cells.
Stephanie M Stoll1, Daniel S Ginsburg, Michele P Calos
1Department of Genetics, Stanford University School of Medicine, Stanford, California 94305-5120, USA.
Journal of Bacteriology
|June 12, 2002
Summary
The TP901-1 phage integrase from Lactococcus lactis can engineer mammalian genomes. This site-specific enzyme efficiently integrates DNA in bacteria and human cells, offering a novel tool for genetic manipulation.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Site-specific integrases are crucial for DNA manipulation.
- Bacteriophage integrases offer potential for genome engineering applications.
Purpose of the Study:
- To evaluate the TP901-1 integrase from Lactococcus lactis for mammalian genome engineering.
- To characterize the integrase's function in bacterial and mammalian systems.
Main Methods:
- Constructed expression vectors for TP901-1 integrase in E. coli and mammalian cells.
- Developed a plasmid assay to quantify intramolecular integration frequency.
- Performed in vitro characterization of integrase activity and partial protein purification.
- Assessed integrase function in human cells.
Main Results:
- TP901-1 integrase functions efficiently in E. coli, with minimal attB and attP sites determined.
- Integrase activity was characterized in vitro, showing cofactor-independent function.
- Efficient intramolecular integration was observed in human cells.
- The minimal attB and attP sites were determined to be 31 bp and 50 bp, respectively, in E. coli.
Conclusions:
- TP901-1 phage integrase is a functional tool for DNA manipulation in mammalian cells.
- This integrase represents a novel reagent for engineering mammalian genomes.
- The study provides insights into the minimal DNA requirements for TP901-1 integrase activity.