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Related Experiment Videos

Rapid plasmid library screening using RecA-coated biotinylated probes.

B Rigas, A A Welcher, D C Ward

    Proceedings of the National Academy of Sciences of the United States of America
    |December 1, 1986
    PubMed
    Summary

    This study presents a novel RecA protein-based method for rapidly isolating specific recombinant plasmids from complex libraries. The technique achieves significant enrichment and recovery, enabling efficient screening of DNA libraries.

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    Area of Science:

    • Molecular Biology
    • Biotechnology
    • Genomics

    Background:

    • Isolating specific recombinant plasmids from complex libraries is crucial for genetic research.
    • Existing methods can be time-consuming and inefficient.
    • RecA protein's ability to mediate DNA strand exchange offers a potential avenue for improved isolation techniques.

    Purpose of the Study:

    • To develop a rapid physical isolation method for recombinant plasmids using RecA protein.
    • To enable efficient screening of plasmid cDNA libraries.
    • To demonstrate the method's effectiveness in enriching and recovering homologous plasmids.

    Main Methods:

    • Utilized RecA protein to form stable complexes between homologous DNA molecules.
    • Employed biotinylated DNA probes for screening plasmid libraries.

    Related Experiment Videos

  • Purified RecA-DNA complexes using streptavidin-agarose or avidin/cupric iminodiacetic acid-agarose chromatography.
  • Propagated recovered plasmids in Escherichia coli.

    • Main Results:

    • Achieved homologous plasmid recovery rates between 10% and 20%.
    • Demonstrated enrichment factors ranging from 10^4- to 10^5-fold.
    • Successfully isolated specific plasmids from reconstituted libraries containing homologous and heterologous species.

    Conclusions:

    • The RecA-mediated method provides a rapid and efficient means for physical isolation of recombinant plasmids.
    • This technique offers significant enrichment and recovery, facilitating library screening.
    • Potential applications include screening of various DNA libraries and physical mapping of genomes.