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Related Experiment Videos

P1 plasmid replication requires methylated DNA.

A L Abeles1, S J Austin

  • 1Laboratory of Chromosome Biology, BRI-Basic Research Program, NCI-Frederick Cancer Research Facility, MD 21701.

The EMBO Journal
|October 1, 1987
PubMed
Summary
This summary is machine-generated.

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Bacteriophage P1 plasmid replication requires DNA adenine methylase (dam) activity. Methylation of dam-sensitive sites within the P1 origin is essential for initiation, controlling copy number.

Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • Plasmids are crucial tools in molecular biology and genetics.
  • Bacteriophage P1 plasmids are widely used for their stringent copy-number control.
  • DNA adenine methylase (dam) is a key enzyme in bacterial DNA methylation.

Purpose of the Study:

  • To investigate the role of DNA adenine methylase (dam) in the replication of bacteriophage P1 plasmids.
  • To elucidate the mechanism by which the P1 origin initiates replication.
  • To understand the basis of the stringent copy-number control of P1 plasmids.

Main Methods:

  • Utilizing a composite plasmid with two origins of replication in Escherichia coli strains.
  • Developing an in vitro replication system for the P1 origin using M13 replicative-form DNA.

Related Experiment Videos

  • Employing crude E. coli extracts and purified P1 RepA protein in the in vitro system.

    • Main Results:

    • Plasmids with the P1 origin cannot be established in dam-defective E. coli.
    • The P1 origin fails to function even in established plasmids in dam strains.
    • In vitro replication is dependent on RepA protein and methylation of dam-sensitive sites.
    • Five dam-sensitive sites within the P1 origin are critical for initiation.

    Conclusions:

    • DNA adenine methylase (dam) activity and methylation of specific sites are essential for P1 origin function.
    • Methylation is required for the initiation of P1 plasmid replication.
    • Post-replicational methylation likely controls reinitiation and contributes to P1's stringent copy-number control.