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Recombination-dependent concatemeric plasmid replication.

J F Viret1, A Bravo, J C Alonso

  • 1Max-Planck-Institut für molekulare Genetik, Berlin, Germany.

Microbiological Reviews
|December 1, 1991
PubMed
Summary
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A new mode of plasmid replication in prokaryotes creates long DNA chains (concatemers). This process, unlike standard DNA replication, involves recombination and offers new insights into DNA replication and repair mechanisms.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Prokaryotic DNA replication, particularly of supercoiled plasmids, is typically initiated by a rate-limiting factor.
  • Established replication modes (theta and sigma) are independent of DNA repair and recombination pathways.

Purpose of the Study:

  • To characterize a novel mode of plasmid replication in prokaryotes.
  • To investigate the mechanisms underlying the formation of linear multigenome-length plasmid concatemers.

Main Methods:

  • Structural and functional studies of plasmid replication.
  • Comparative analysis with phage replication modes.

Main Results:

  • A novel plasmid replication mode results in the accumulation of linear plasmid concatemers in both gram-positive and gram-negative bacteria.

Related Experiment Videos

  • This recombination-dependent replication differs from standard form I DNA replication, requiring an intermediate recombination step for initiation.

    • Conclusions:

    • Recombination-dependent plasmid replication shares similarities with phage late replication.
    • This mode offers new perspectives on prokaryotic DNA replication and recombination mechanisms.