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Related Experiment Videos

Origin and initiation sites of lambda dv DNA replication in vitro.

T Tsurimoto, H Kouhara, K Matsubara

    Basic Life Sciences
    |January 1, 1985
    PubMed
    Summary

    Researchers identified a 165-bp DNA region (ori) essential for lambda DNA replication initiation. This origin region, containing repeat sequences and an A+T-rich stretch, directs bidirectional DNA synthesis, with leftward replication being more frequent.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Bacteriophage lambda DNA replication is a complex process requiring specific initiation events.
    • Previous studies suggested involvement of various DNA regions in lambda replication initiation.

    Purpose of the Study:

    • To precisely map the functional origin of replication (ori) in lambda DNA.
    • To analyze the initiation sites and directionality of DNA synthesis at the lambda ori region.

    Main Methods:

    • In vitro replication system using lambda DNA fragments and pBR322 plasmids.
    • Analysis of replicative intermediates in the presence of DNA chain elongation inhibitors (ddCTP).
    • Mapping of RNA-DNA transition sites using 32P labeling after alkaline hydrolysis.

    Main Results:

    • A 165-bp region (ori) left of the EcoRI site in the O gene was identified as the functional origin.
    • Replication initiation occurred around the ori region, dependent on lambda O and P proteins.
    • Transition sites from primer RNA to DNA synthesis were found on both sides of the ori region, not within it.
    • Multiple transition sites clustered on one strand, with converging DNA synthesis from both sides of the ori.
    • Leftward DNA synthesis was more frequent than rightward synthesis, indicating asymmetric bidirectional replication.

    Conclusions:

    • The 165-bp ori region is sufficient for lambda-specific replication initiation.
    • DNA synthesis initiates on both sides of the ori region and converges, demonstrating asymmetric bidirectional replication.
    • The findings provide insights into the mechanism of lambda phage DNA replication.

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