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Related Experiment Videos

Bacterial DNA segregation by dynamic SopA polymers.

Grace E Lim1, Alan I Derman, Joe Pogliano

  • 1Division of Biological Sciences, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0377, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 25, 2005
PubMed
Summary
This summary is machine-generated.

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Bacterial plasmid segregation relies on SopA protein polymerization. This dynamic filament assembly, nucleated by SopB/sopC complexes, drives efficient plasmid separation into daughter cells.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Cell Biology

Background:

  • ParA ATPases are crucial for bacterial plasmid and chromosome positioning and segregation.
  • Understanding the molecular mechanisms of plasmid partitioning is essential for bacterial cell division.

Purpose of the Study:

  • To investigate the polymerization dynamics of the F-plasmid partitioning protein SopA.
  • To elucidate the role of SopA polymerization in plasmid DNA segregation.
  • To determine the interaction between SopA, SopB, and sopC DNA.

Main Methods:

  • In vitro polymerization assays of SopA protein.
  • Analysis of SopA dynamics within bacterial cells using microscopy.
  • Site-directed mutagenesis to study SopA polymerization mutants.

Related Experiment Videos

  • In vitro assembly of SopA filaments on SopB/sopC-DNA complexes.

    • Main Results:

    • SopA polymerizes into filaments in an ATP-dependent manner in vitro.
    • SopA filaments elongate at rates comparable to in vivo plasmid separation.
    • SopA exhibits dynamic polymerization and depolymerization cycles within the cell.
    • SopB/sopC complexes nucleate SopA assembly and are required for its dynamic behavior.
    • Mutations preventing SopA polymerization inhibit plasmid segregation.
    • In vitro, SopA filaments form radial asters emanating from SopB/sopC-DNA complexes.

    Conclusions:

    • Plasmid segregation is driven by the ATP-dependent polymerization of SopA.
    • The dynamic assembly of SopA filaments is critical for efficient plasmid partitioning.
    • SopB/sopC nucleates SopA polymerization, facilitating plasmid positioning and segregation.