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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Developing a peptide to disrupt cohesin head domain interactions.

Maria Elias1, Samar Gani2, Yana Lerner2

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|September 4, 2023
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Summary

Researchers developed the first cohesin-inhibiting peptide (CIP) that blocks the ATPase activity of cohesin, a protein complex vital for genome stability. This peptide impacts cohesin function in yeast and human cells, showing therapeutic potential.

Keywords:
Cell biologyMolecular biologyProtein

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Cohesin is crucial for 3-D chromatin structure, genome stability, and function.
  • The cohesin core, composed of Smc1 and Smc3 proteins, utilizes an ATPase cycle essential for its activity.
  • Understanding cohesin's mechanism is key to exploring its role in cellular processes and disease.

Purpose of the Study:

  • To develop the first peptide inhibitor targeting cohesin.
  • To investigate the mechanism of action and cellular effects of a novel cohesin-inhibiting peptide (CIP).
  • To assess the potential of CIPs as a therapeutic strategy.

Main Methods:

  • In vitro binding assays to confirm CIP interaction with Smc3.
  • Enzyme activity assays to measure inhibition of cohesin's ATPase activity.
  • Cellular studies in yeast and human cells to evaluate the effects of CIP on cohesin function and localization.

Main Results:

  • The developed peptide (CIP) successfully binds Smc3 in vitro.
  • CIP effectively inhibits the ATPase activity of the cohesin holocomplex.
  • CIP treatment in yeast cells disrupts cohesin's tethering activity and causes cohesin accumulation on chromatin, with similar effects observed in human cells.

Conclusions:

  • Peptides can be effectively utilized to inhibit cohesin function within cellular systems.
  • The novel cohesin-inhibiting peptides (CIPs) demonstrate a powerful approach to modulate cohesin activity.
  • CIPs hold potential as a therapeutic avenue for conditions involving cohesin dysregulation.