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Schizosaccharomyces pombe minichromosome maintenance-binding protein (MCM-BP) antagonizes MCM helicase

Lin Ding1, Susan L Forsburg

  • 1Molecular and Computational Biology Program, University of Southern California, Los Angeles, California 90089-2910, USA.

The Journal of Biological Chemistry
|August 5, 2011
PubMed

Insights

Schizosaccharomyces pombe mcb1(+) (Mcm-binding protein 1) is essential for DNA replication and genome stability. It antagonizes the minichromosome maintenance (MCM) helicase, impacting DNA duplication and cell cycle progression.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The minichromosome maintenance (MCM) complex is a replicative helicase crucial for DNA duplication and genome stability.
  • MCM complex is a heterohexamer essential for DNA replication.
  • Mcm-binding protein 1 (Mcb1) is an orthologue of human MCM-binding protein.

Purpose of the Study:

  • To identify and characterize the function of Schizosaccharomyces pombe mcb1(+) in relation to the MCM complex.
  • To investigate the interaction between Mcb1 and MCM proteins.
  • To elucidate the role of Mcb1 in DNA replication and cell cycle control.

Main Methods:

  • Gene deletion and phenotypic analysis of Schizosaccharomyces pombe.
  • Co-immunoprecipitation to study protein interactions.
  • Analysis of DNA replication, DNA damage, and checkpoint activation.

Main Results:

  • mcb1(+) is an essential gene in Schizosaccharomyces pombe.
  • Deletion of mcb1(+) leads to cell cycle arrest and nuclear structure disruption.
  • Mcb1 interacts with Mcm3-7 but not Mcm2 within the MCM complex.
  • Overproduction of Mcb1 inhibits DNA replication, causes DNA damage, and activates Chk1.

Conclusions:

  • Mcb1 is a critical regulator of MCM helicase function.
  • Mcb1 antagonizes MCM helicase activity, impacting DNA replication and genome stability.
  • Mcb1 plays a vital role in maintaining cell cycle progression and nuclear integrity.

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