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Related Experiment Videos

Direct evidence for DNA bending at the lambda replication origin.

K Zahn, F R Blattner

    Science (New York, N.Y.)
    |April 24, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    Bacteriophage lambda replication initiation requires DNA bending. Specific DNA sequences act as bend sites, facilitating initiator protein O binding and origin DNA wrapping for replication.

    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Replication initiation in bacteriophage lambda involves the wrapping of origin (ori) DNA around the initiator protein O.
    • DNA flexibility is limited, suggesting specific DNA sequences (bend sites) may facilitate this essential wrapping process.
    • Previous studies indicated ori DNA exhibits bend site characteristics, enhanced by initiator protein binding.

    Purpose of the Study:

    • To directly examine and quantify the bending of bacteriophage lambda origin DNA.
    • To investigate the role of specific DNA sequences and protein interactions in origin bending.

    Main Methods:

    • Polymerized origin sequences were used to assess their ability to form small circles.
    • Circularization efficiency was measured to determine the radius of curvature of the DNA.

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    Main Results:

    • The smallest observed circles, composed of 84 residues, are consistent with the required 50 angstrom radius of curvature for replication initiation.
    • Bend sites within O protein binding sites, inter-site spacers, and inherent DNA flexibility contribute to origin bending.
    • A critical bend site is necessary for the binding of O protein to the DNA.

    Conclusions:

    • Specific DNA bend sites are crucial for facilitating the necessary DNA curvature during bacteriophage lambda replication initiation.
    • The interaction between initiator protein O and bent DNA is essential for the initiation of viral DNA replication.