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Related Experiment Videos

Rolling-circle replication of bacterial plasmids

S A Khan1

  • 1Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pennsylvania 15261, USA. Khan@med.pitt.edu

Microbiology and Molecular Biology Reviews : MMBR
|December 31, 1997
PubMed
Summary
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Bacterial plasmids use rolling-circle replication, similar to ssDNA phages, with distinct origins and Rep proteins. Replication is regulated by Rep protein synthesis, crucial for controlling plasmid copy number.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Bacterial plasmids frequently utilize a rolling-circle (RC) replication mechanism.
  • RC plasmid replication shares similarities and differences with single-stranded DNA (ssDNA) coliphage replication.

Purpose of the Study:

  • To elucidate the replication mechanisms of bacterial rolling-circle plasmids.
  • To understand the role of Rep proteins and origin sequences in RC plasmid replication.

Main Methods:

  • Comparative analysis of RC plasmid families based on Rep protein homology.
  • Identification of functional domains within leading-strand origins for binding, nicking, initiation, and termination.
  • Development and utilization of in vitro replication systems.

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Main Results:

  • RC plasmids are classified into families by Rep protein and origin homology.
  • Leading-strand origins possess specific sequences for Rep protein interaction and replication control.
  • Rep proteins contain domains for origin binding and nicking; their synthesis regulates replication and copy number.

Conclusions:

  • RC plasmid replication involves distinct leading- and lagging-strand origins.
  • Host proteins are essential for converting displaced ssDNA to double-stranded DNA.
  • Rep protein activity and synthesis are key regulatory points for RC plasmid replication.