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Related Experiment Videos

Conserved interactions in the Staphylococcus aureus DNA PolC chromosome replication machine.

Irina Bruck1, Roxana E Georgescu, Mike O'Donnell

  • 1Howard Hughes Medical Institute and Rockefeller University, New York, New York 10021, USA.

The Journal of Biological Chemistry
|January 14, 2005
PubMed
Summary

Staphylococcus aureus and E. coli replicase subunits show conserved function despite evolutionary distance. Key interactions between polymerase and clamp loader proteins are highly conserved across bacterial species.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial DNA replication relies on complex holoenzyme replicases.
  • Understanding subunit interactions is crucial for deciphering replication mechanisms.

Purpose of the Study:

  • To investigate the activity and interchangeability of Staphylococcus aureus (S. aureus) replicase subunits.
  • To compare S. aureus replicase components with those of Escherichia coli (E. coli) polymerase III holoenzyme.
  • To explore the conservation of protein-protein interactions within bacterial DNA replication machinery.

Main Methods:

  • Reconstitution of the S. aureus PolC holoenzyme from purified subunits.
  • In vitro assays to assess DNA binding, ATPase activity, and protein complex stability.

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  • Cross-species complementation assays using subunits from S. aureus, E. coli, and Streptococcus pyogenes.

    • Main Results:

    • S. aureus tau subunit binds single-stranded DNA and exhibits DNA-stimulated ATPase activity, comparable to E. coli tau.
    • S. aureus PolC C-terminal residues facilitate binding and function with heterologous beta clamps.
    • The S. aureus clamp loader demonstrates broad activity, loading E. coli and S. pyogenes beta clamps onto DNA.

    Conclusions:

    • Despite significant evolutionary divergence, bacterial DNA replicase components exhibit remarkable conservation in structure and function.
    • The interaction between polymerase and beta clamp is a highly conserved feature of DNA replication.
    • Potential limitations in S. aureus clamp loader interaction with heterologous clamps warrant further investigation.