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Cell cycle-specific changes in nucleoprotein complexes at a chromosomal replication origin

M R Cassler1, J E Grimwade, A C Leonard

  • 1Department of Biological Sciences, Florida Institute of Technology, Melbourne 32901, USA.

The EMBO Journal
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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Protein binding at DNA replication origins is crucial but poorly understood. This study reveals a dynamic exchange of Factor for Inversion Stimulation (FIS) and Integration Host Factor (IHF) at oriC, regulating DNA synthesis initiation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication initiation is a tightly regulated process.
  • The precise order of protein assembly at replication origins remains largely unknown.
  • Nucleoprotein complexes at bacterial origins play critical roles in cell cycle control.

Purpose of the Study:

  • To elucidate the temporal order of protein binding at the oriC replication origin.
  • To understand the role of specific proteins, FIS and IHF, in regulating DNA synthesis initiation.
  • To investigate the composition of nucleoprotein complexes at oriC during different cell cycle phases.

Main Methods:

  • Chromatin immunoprecipitation (ChIP) assays to detect protein binding.
  • Analysis of nucleoprotein complex formation using biochemical techniques.

Related Experiment Videos

  • Comparison of protein association patterns in cycling versus stationary phase cells.

    • Main Results:

    • Two distinct nucleoprotein complexes exist at oriC in cycling cells.
    • A switch from a Factor for Inversion Stimulation (FIS)-bound complex to an Integration Host Factor (IHF)-bound complex occurs upon initiation of DNA replication.
    • DnaA protein binds to its R3 site coincident with IHF binding.
    • In stationary phase, a third complex lacking FIS and containing IHF is observed.

    Conclusions:

    • The interplay between FIS and IHF is essential for the timely assembly of initiation complexes at replication origins.
    • This dynamic exchange mechanism helps regulate DNA synthesis initiation and prevent it at inappropriate times.
    • The observed switching mechanism at oriC is analogous to chromatin state changes in eukaryotic replication origins.