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Related Experiment Videos

Information analysis of sequences that bind the replication initiator RepA

P P Papp1, D K Chattoraj, T D Schneider

  • 1Laboratory of Biochemistry, National Cancer Institute, NIH, Bethesda, MD 20892.

Journal of Molecular Biology
|September 20, 1993
PubMed
Summary

RepA protein binds plasmid P1 DNA on one face, with critical contacts in major grooves. Unexpected findings in the minor groove suggest indirect recognition mechanisms for DNA-protein interactions.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The replication initiator protein RepA is crucial for plasmid P1 DNA replication and autoregulation.
  • RepA binds to multiple specific sites on the plasmid, controlling gene expression and replication initiation.
  • Understanding these DNA-protein interactions is key to deciphering plasmid replication control.

Purpose of the Study:

  • To elucidate the precise DNA-protein interactions between RepA and its binding sites on plasmid P1.
  • To identify the specific DNA bases and grooves involved in RepA recognition.
  • To investigate the mechanism of DNA sequence recognition by RepA.

Main Methods:

  • Saturation mutagenesis to assess the importance of conserved sequences in RepA binding sites.

Related Experiment Videos

  • Methylation interference and protection assays to map protein contact points.
  • Hydroxyl radical footprinting to determine DNA backbone contacts.
  • Bioinformatic analysis of DNA-protein interaction patterns.

    • Main Results:

    • Three highly conserved sequence patches were identified in RepA binding sites.
    • Outer conserved patches are critical for RepA binding, involving major groove contacts with specific guanine bases.
    • RepA binds to its target DNA sequence on a single face of the DNA helix.
    • A central conserved patch, likely interacting with the minor groove, shows unusual sequence-specific recognition.

    Conclusions:

    • RepA utilizes specific major groove contacts on one face of the DNA for binding.
    • The central conserved region's interaction with the minor groove is not explained by simple base-pair recognition models.
    • The central patch may indirectly influence RepA binding by affecting DNA conformation.