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Minichromosome maintenance proteins interact with checkpoint and recombination proteins to promote s-phase genome

Julie M Bailis1, Douglas D Luche, Tony Hunter

  • 1Molecular and Computational Biology Section, University of Southern California, 1050 Childs Way RRI 201B, Los Angeles, CA 90089-2910, USA.

Molecular and Cellular Biology
|January 9, 2008
PubMed

Insights

The minichromosome maintenance (MCM) complex protects DNA replication forks and aids recovery from replication stress. Loss of MCM function causes replication fork collapse and genome instability, conserved from yeast to humans.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The minichromosome maintenance (MCM) complex is crucial for DNA replication, acting in prereplication complex formation and as a helicase at replication forks.
  • Understanding MCM's role beyond DNA unwinding is essential for comprehending genome stability during S-phase.

Purpose of the Study:

  • To investigate the role of the MCM complex in protecting replication fork structure and promoting recovery from replication arrest using fission yeast.
  • To elucidate the molecular mechanisms by which MCM proteins interact with checkpoint and recombination pathways.

Main Methods:

  • Utilized the fission yeast (Schizosaccharomyces pombe) model system.
  • Investigated the consequences of MCM loss-of-function on DNA synthesis and replication fork stability.
  • Analyzed MCM protein interactions with Cds1 kinase and homologous recombination proteins.

Main Results:

  • Loss of MCM function leads to lethal double-strand breaks during replication elongation, indicative of replication fork collapse.
  • MCM function is vital for maintaining the stability of hydroxyurea-stalled replication forks and activating the replication checkpoint.
  • Mcm4 protein binds and undergoes phosphorylation by Cds1 kinase upon checkpoint activation; MCM proteins interact with homologous recombination factors.

Conclusions:

  • The MCM complex links replication fork stabilization with checkpoint activation and recovery through direct interactions with checkpoint and recombination proteins.
  • This function of the MCM complex in maintaining S-phase genome stability is conserved across species, including humans.
  • MCM complex plays a critical role in preventing replication fork collapse and ensuring proper cell cycle progression after replication stress.

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