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Tn5cos: a transposon for restriction mapping of large plasmids using phage lambda terminase
1Lehrstuhl für Genetik, Universität Bayreuth, F.R.G.
Gene
|July 15, 1991
Summary
A new method enables rapid restriction mapping of large plasmids using a Tn5-integrated phage lambda DNA fragment. This technique allows efficient linearization and selective labeling for direct restriction map determination from partial digestion products.
Area of Science:
- Molecular Biology
- Genomics
- Biotechnology
Background:
- Restriction mapping is crucial for characterizing large DNA molecules like plasmids.
- Existing methods can be time-consuming and labor-intensive for large plasmids.
Purpose of the Study:
- To develop a rapid and efficient method for restriction mapping of large plasmids.
- To enable precise determination of restriction sites on complex plasmid DNA.
Main Methods:
- Insertion of a phage lambda DNA cos region fragment into Tn5 transposon (Tn5cos).
- In vivo transposition of Tn5cos into target plasmids.
- Plasmid linearization using phage lambda terminase (Ter) at the cos site.
- Partial restriction enzyme digestion of linearized plasmids.
- Selective labeling of DNA termini using digoxygenin (DIG)-11-dUTP and hybridization.
- Pulsed field gel electrophoresis (PFGE) and DIG-detection for fragment visualization.
Main Results:
- Efficient (approx. 70%) linearization of plasmids at the cos site.
- Successful selective labeling of linearized DNA fragments at either end.
- Generation of a 'ladder' of partial digestion products visualized on a gel.
- Direct determination of restriction maps from the visualized fragment patterns.
Conclusions:
- The developed method provides a rapid and efficient approach for restriction mapping of large plasmids.
- This technique simplifies the analysis of complex plasmid structures.
- The method is valuable for molecular biology research and genetic engineering applications.