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Mms1 and Mms22 stabilize the replisome during replication stress.

Jessica A Vaisica1, Anastasija Baryshnikova, Michael Costanzo

  • 1Department of Biochemistry, University of Toronto, Toronto, ON M5S 1A8, Canada.

Molecular Biology of the Cell
|May 20, 2011
PubMed
Summary

Mms1 and Mms22 proteins stabilize the DNA replication machinery during replication stress. Cells lacking these proteins struggle to recover from stalled replication forks, highlighting their crucial role in DNA replication integrity.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Mms1 and Mms22 form a Cul4(Ddb1)-like E3 ubiquitin ligase with Rtt101.
  • The function of the Rtt101(Mms1/Mms22) ubiquitin ligase in promoting replication through damaged DNA is not fully understood.

Purpose of the Study:

  • To investigate the role of Mms1 and Mms22 in DNA replication fork progression and recovery under replication stress.
  • To determine how Mms1 and Mms22 contribute to maintaining replisome integrity.

Main Methods:

  • Analysis of mms1Δ and mms22Δ mutant cells under replication stress conditions (e.g., hydroxyurea treatment).
  • Localization studies of Mms1 at stalled replication forks.
  • Assessment of replisome component binding at stalled forks in wild-type versus mutant cells.

Main Results:

  • mms1Δ and mms22Δ cells exhibit defects in regulating DNA replication fork progression and recovery from stress.
  • Mms1 localizes to stalled replication forks, dependent on Rtt101 and Mms22.
  • Mms1 and Mms22 stabilize the replisome, as evidenced by decreased binding of Mrc1, Csm3, and DNA polymerase ε at stalled forks in mutant cells.

Conclusions:

  • Mms1 and Mms22 are essential for maintaining replisome integrity during replication stress.
  • These proteins facilitate efficient recovery from replication stress by stabilizing the replication machinery at stalled forks.