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A small plasmid for recombination-based screening.
A J Hanzlik1, M M Osemlak-Hanzlik, D M Kurnit
1Department of Pediatrics, Howard Hughes Medical Institute, University of Michigan Medical Center, Ann Arbor 48109-0650.
Gene
|December 1, 1992
Summary
Researchers developed pMAD3, a small R6K-derived plasmid for efficient cloning. This plasmid facilitates PCR-based cloning and recombination screening of lambda libraries, improving molecular biology workflows.
Area of Science:
- Molecular Biology
- Plasmid Construction
- Cloning Techniques
Background:
- Previous work established the pMAD1 plasmid for recombination-based screening.
- ColE1 sequences in lambda libraries necessitate compatible plasmids for screening.
Purpose of the Study:
- To construct a smaller, more versatile R6K-derived plasmid (pMAD3) for molecular cloning.
- To enable simplified and efficient cloning protocols using PCR.
Main Methods:
- Construction of the 2.5-kb R6K-derived plasmid, pMAD3, lacking the pir gene.
- Complementation of pir gene function in trans using pPR1.
- Utilizing PCR for plasmid amplification and a simplified annealing-based cloning protocol.
Main Results:
- pMAD3 was successfully constructed and shown to be readily amplified by PCR.
- The plasmid enables the insertion of larger DNA fragments.
- A simplified PCR-based cloning protocol using annealing was developed for pMAD3.
Conclusions:
- pMAD3 offers a smaller and more efficient alternative to pMAD1 for molecular cloning.
- The simplified PCR-based cloning protocol enhances ease of use and efficiency.
- pMAD3 is suitable for retrieving larger lambda inserts and facilitates recombination-based screening.