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M-Cdk Drives Transition Into Mitosis

Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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M cyclin...
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Structural insights into the Cdt1-mediated MCM2-7 chromatin loading.

Changdong Liu1, Rentian Wu, Bo Zhou

  • 1Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Nucleic Acids Research
|December 6, 2011
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Summary

Researchers elucidated how Cdt1 protein loads the MCM2-7 helicase onto DNA for replication initiation. Charge complementarity drives this interaction, crucial for preventing replication errors and ensuring cell viability.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • DNA replication initiation in eukaryotes is tightly regulated to occur once per cell cycle.
  • The Cdt1 protein facilitates the loading of the mini-chromosome maintenance 2-7 (MCM2-7) helicase onto chromatin, a critical step for replication.
  • Understanding the molecular mechanism of MCM2-7 loading is essential for comprehending cell division control.

Purpose of the Study:

  • To determine the structure of the human Cdt1-Mcm6 binding domains complex.
  • To elucidate the molecular mechanism of Cdt1-mediated MCM2-7 helicase loading onto chromatin.
  • To investigate the role of charge complementarity in the Cdt1-Mcm2-7 interaction.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was used to determine the structure of the Cdt1(410-440)/MCM6(708-821) complex.
  • Site-directed mutagenesis was employed to study the functional significance of interacting residues.
  • Yeast genetics was used to assess the impact of mutations on DNA replication and MCM2 loading.

Main Results:

  • The structure revealed charge complementarity as a key determinant for the specific interaction between Cdt1 and Mcm2-7.
  • Mutations disrupting this interaction in yeast Cdt1 and Mcm6 led to defects in DNA replication and MCM2 chromatin loading.
  • These defects resulted in cell death, highlighting the critical nature of this interaction.
  • The Cdt1-Mcm6 interaction occurs via their C-termini, suggesting a specific orientation of MCM2-7 during loading.

Conclusions:

  • Charge complementarity is essential for the specific binding of Cdt1 to the MCM2-7 helicase.
  • Disruption of the Cdt1-Mcm2-7 interaction impairs DNA replication initiation and leads to cell death.
  • The findings provide a structural basis for Cdt1-mediated MCM2-7 loading, suggesting the MCM2-7 hexamer is loaded with its C-terminal end towards the ORC complex.