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Interactions of the RepA1 protein with its replicon targets: two opposing roles in control of plasmid replication

R Maas1, C Wang, W K Maas

  • 1Department of Microbiology, New York University Medical Center, New York 10016, USA. maasr01@mcrcr6.med.nyu.edu

Journal of Bacteriology
|June 1, 1997
PubMed

Insights

The RepA1 initiator protein can inhibit RepFIC miniplasmid replication. Studies identified two genomic interaction sites for RepA1, one in the origin region, suggesting a role in topological changes for replication control.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • RepFIC miniplasmids are crucial for studying plasmid replication mechanisms.
  • The RepA1 initiator protein plays a key role in plasmid DNA replication.

Purpose of the Study:

  • To investigate the inhibitory role of the RepA1 initiator protein on RepFIC miniplasmid replication.
  • To identify genomic regions of RepFIC miniplasmids that interact with RepA1 during replication inhibition.

Main Methods:

  • Analysis of cloned miniplasmid derivatives.
  • In vivo methylation protection footprinting studies.
  • Exploration of the origin region of RepFIC miniplasmids.

Main Results:

  • Demonstrated that RepA1 inhibits miniplasmid replication under specific conditions.
  • Identified two RepFIC genomic regions interacting with RepA1.
  • Characterized a 200 bp protected region in the origin, showing periodicity indicative of topological changes.

Conclusions:

  • RepA1's interaction with specific RepFIC genomic sites, particularly in the origin, suggests a mechanism involving topological alterations.
  • These findings contribute to understanding the complex control of plasmid replication.

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