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The ORC/Cdc6/MCM2-7 complex facilitates MCM2-7 dimerization during prereplicative complex formation.

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Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • DNA Replication

Background:

  • The mini-chromosome-maintenance 2-7 (MCM2-7) helicase is loaded as a double-hexamer onto DNA origins to initiate replication.
  • Formation of the prereplicative complex (pre-RC) involves sequential assembly steps, including the initial complex and the ORC/Cdc6/MCM2-7 (OCM) complex.

Purpose of the Study:

  • To elucidate the mechanism by which the OCM complex is converted into the MCM2-7 double-hexamer during pre-RC assembly.
  • To identify the role of MCM2-7 dimerization in helicase loading and origin licensing.

Main Methods:

  • Analysis of MCM2-7 hexamer-interface mutants in Saccharomyces cerevisiae.
  • Biochemical characterization of protein complexes involved in helicase loading.
  • Cell-cycle arrest and lethality assays upon overexpression of mutant MCM2-7 proteins.

Main Results:

  • A novel complex competent for MCM2-7 dimerization was discovered.
  • MCM2-7 mutants arrest at the OCM stage, prior to double-hexamer formation, indicating MCM2-7 dimerization is a limiting step.
  • The OCM complex, but not the initial complex, is competent for MCM2-7 dimerization, forming a salt-sensitive intermediate.

Conclusions:

  • The OCM complex is competent for MCM2-7 dimerization, a critical step in helicase loading.
  • MCM2-7 dimerization is a rate-limiting step in pre-RC formation.
  • These findings define key mechanisms in origin licensing and explain observed cell-cycle arrest phenotypes.