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Related Experiment Videos

Distinct roles for cyclins E and A during DNA replication complex assembly and activation.

Dawn Coverley1, Heike Laman, Ronald A Laskey

  • 1Hutchison/MRC Research Centre, MRC Cancer Cell Unit, Hills Road, Cambridge, CB2 2XZ, UK. dc17@york.ac.uk

Nature Cell Biology
|June 25, 2002
PubMed
Summary

Cyclin E promotes DNA replication complex assembly, while cyclin A activates synthesis and prevents new assembly. This sequential action ensures DNA replication occurs only once per cell cycle.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cyclin-dependent protein kinase 2 (Cdk2) regulates DNA replication initiation with cyclins A and E.
  • The necessity for two distinct cyclins and their ordered activation in DNA replication remains unclear.

Purpose of the Study:

  • To elucidate the specialized roles of cyclin E and cyclin A during the G0 to S phase transition in DNA replication.
  • To understand the regulatory mechanisms governing the order of cyclin activation and its impact on replication initiation.

Main Methods:

  • Utilized a cell-free system for DNA replication initiation.
  • Employed G1 nuclei, G1 cytosol, and recombinant proteins for in vitro studies.
  • Investigated the functions of cyclins E and A in replication complex assembly and DNA synthesis.

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Main Results:

  • Cyclin E collaborates with Cdc6 to stimulate replication complex assembly, rendering G1 nuclei replication-competent.
  • Cyclin A exhibits dual functions: activating DNA synthesis in pre-assembled complexes and inhibiting new complex formation.
  • Cyclin E creates a temporal window for assembly, which is subsequently closed by cyclin A's inhibitory role.

Conclusions:

  • The distinct and sequential functions of cyclin E and cyclin A ensure proper temporal regulation of DNA replication.
  • Cyclin A's dual role prevents re-initiation of DNA replication until the subsequent cell cycle by ensuring assembly precedes synthesis.