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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
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DnaT is a PriC-binding protein.

Chien-Chih Huang1, Cheng-Yang Huang2

  • 1School of Biomedical Sciences, Chung Shan Medical University, No.110, Sec.1, Chien-Kuo N. Rd., Taichung City, Taiwan.

Biochemical and Biophysical Research Communications
|July 9, 2016
PubMed
Summary
This summary is machine-generated.

This study reveals a direct interaction between replication restart proteins DnaT and PriC from Klebsiella pneumoniae. This finding links two independent DNA replication restart pathways, PriA- and PriC-dependent primosome assemblies.

Keywords:
DNA replication restartDnaTPriBPriCPrimosomeSSB

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DnaT and PriC are essential replication restart proteins.
  • DnaT is part of the PriA-dependent primosome.
  • PriC is part of the PriC-dependent primosome.

Purpose of the Study:

  • To investigate the potential interaction between DnaT and PriC.
  • To define the direct interaction between PriC and DnaT from Klebsiella pneumoniae.
  • To explore the link between PriA- and PriC-dependent replication restart pathways.

Main Methods:

  • Fluorescence titrations to determine PriC binding to single-stranded DNA.
  • Gold nanoparticle assay to detect protein-protein interactions.
  • Heparin HP column for co-purification of the DnaT-PriC complex.
  • Surface plasmon resonance to quantify the binding affinity (Kd).

Main Results:

  • PriC binds single-stranded DNA with a site size of approximately 9 nucleotides.
  • The gold nanoparticle assay indicated a DnaT-PriC interaction.
  • The DnaT-PriC complex was successfully co-purified.
  • Surface plasmon resonance analysis yielded a Kd value of 2.9 × 10⁻⁸ M for DnaT binding to PriC.

Conclusions:

  • This study provides the first evidence of a direct interaction between DnaT and PriC.
  • The findings suggest a link between the PriA- and PriC-dependent replication restart pathways.
  • Further research should focus on the mechanism of DnaT binding to the PriC-SSB-DNA complex and its regulatory role.