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Related Experiment Videos

Strand exchange in lambda integrative recombination: genetics, biochemistry, and models.

H A Nash, K Mizuuchi, L W Enquist

    Cold Spring Harbor Symposia on Quantitative Biology
    |January 1, 1981
    PubMed
    Summary

    Site-specific recombination in phage lambda involves a four-strand intermediate. Strand exchange during this process can be asynchronous and result in extended joints, with DNA nucleotides and superhelical turns conserved.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Site-specific recombination is a crucial process for viral genome integration and maintenance.
    • Understanding the mechanism of strand exchange in phage lambda recombination is essential for elucidating DNA repair and replication pathways.

    Purpose of the Study:

    • To investigate the mechanism of strand exchange during site-specific recombination of phage lambda.
    • To present new data on the topoisomerase activity of the Int protein and its role in DNA relaxation.

    Main Methods:

    • In vivo and in vitro recombination assays were performed.
    • Analysis of recombination joint structure (flush vs. extended).
    • Investigation of nucleotide and superhelical turn conservation during recombination.

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    Main Results:

    • Recombination joints can be extended, not just flush.
    • Four-strand breaks and rejoinings can occur asynchronously.
    • Nucleotides at the crossover site and superhelical turns are conserved.
    • Int protein's topoisomerase activity relaxes DNA via transient single-strand breaks.

    Conclusions:

    • A model for strand exchange is proposed with a four-strand structure as the central intermediate.
    • The findings provide new insights into the mechanistic details of site-specific recombination.
    • This study contributes to the understanding of DNA manipulation by viral recombinases.