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MTBP phosphorylation controls DNA replication origin firing.

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Metazoan Sld7, or Mdm2 binding protein (MTBP), acts as a key regulator for genome duplication by controlling origin firing. Kinase pathways target MTBP, influencing its role in DNA replication and damage response.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Faithful genome duplication relies on precise regulation of DNA replication origins.
  • Key regulators of eukaryotic origin firing include Mcm2-7 helicase, Sld3/Treslin/TICRR, and Sld2/RecQL4.
  • Metazoan Sld7, also known as Mdm2 binding protein (MTBP), is a crucial but less understood factor.

Purpose of the Study:

  • To investigate the regulatory mechanisms of metazoan Sld7 (MTBP) in origin firing.
  • To identify kinase pathways targeting MTBP and their impact on DNA replication.
  • To elucidate MTBP's role as a platform for origin firing regulation.

Main Methods:

  • Utilized phospho-mimetic and non-phosphorylatable MTBP mutants in human cells.
  • Investigated MTBP phosphorylation by cyclin-dependent kinases (CDK) and Cdk8/19-cyclin C.
  • Assessed the effects of MTBP mutations on origin firing under normal and DNA damage conditions.

Main Results:

  • MTBP is phosphorylated by CDK and Cdk8/19-cyclin C at specific sites, promoting origin firing.
  • Phosphorylation at DNA damage checkpoint kinase sites inhibits MTBP's origin firing function.
  • A non-phospho MTBP mutant increased genome-wide origin firing in unperturbed cells, but did not rescue origin firing suppression upon DNA damage.

Conclusions:

  • MTBP serves as a central regulatory platform for metazoan origin firing.
  • Multiple kinase pathways converge on MTBP to control DNA replication initiation.
  • MTBP's phosphorylation status is critical for coordinating DNA replication with cell cycle progression and DNA damage response.