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Related Experiment Videos

Cdc7p-Dbf4p becomes famous in the cell cycle.

R A Sclafani1

  • 1Department of Biochemistry and Molecular Genetics, University of Colorado Health Sciences Center, Denver, CO 80262, USA. robert.sclafani@uchsc.edu

Journal of Cell Science
|May 29, 2000
PubMed
Summary

The Cdc7p-Dbf4 kinase complex is crucial for initiating DNA replication and is conserved across eukaryotes. Its overexpression in tumors suggests potential as an early cancer biomarker.

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Cell cycle control of Cdc7p kinase activity through regulation of Dbf4p stability.

Molecular and cellular biology·1999

Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Biochemistry

Background:

  • Cyclin-dependent kinases (CDKs) are well-studied regulators of the cell cycle.
  • Cdc7p kinase, complexed with Dbf4p, plays a vital role in DNA replication initiation.
  • Its involvement in DNA damage-induced mutagenesis and meiotic recombination is also noted.

Purpose of the Study:

  • To elucidate the regulation and substrates of the Cdc7p-Dbf4p kinase.
  • To understand the role of Cdc7p kinase in DNA replication and cell cycle commitment.
  • To explore the potential of Cdc7p-Dbf4p as a cancer biomarker.

Main Methods:

  • Studies across various eukaryotic organisms.
  • Analysis of kinase regulation and substrate interactions.
  • Cell cycle analysis and biochemical assays.

Main Results:

  • Cdc7p forms a CDK-cyclin-like complex with Dbf4p, with Dbf4p levels fluctuating during the cell cycle.
  • Cdc7p-Dbf4p phosphorylates subunits of the MCM helicase complex, potentially activating DNA replication.
  • Cdc7p kinase is essential for DNA replication initiation and conserved evolutionarily.

Conclusions:

  • Cdc7p-Dbf4p kinase activation is a prerequisite for DNA replication.
  • The kinase is involved in DNA damage response and meiotic recombination.
  • Overexpression of Cdc7p-Dbf4 kinase in neoplastic cells indicates its potential as an early cancer biomarker.

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