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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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The structural basis for cohesin-CTCF-anchored loops.

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Cohesin and CTCF proteins structure the genome by forming loops. This study reveals how CTCF directly binds cohesin, explaining loop formation and genome organization.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Structural Biology

Background:

  • Cohesin and CTCF are key proteins involved in genome folding into loops.
  • The precise molecular mechanisms of cohesin-CTCF-mediated 3D genome structuring remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular basis of interaction between CTCF and cohesin.
  • To understand the role of this interaction in CTCF-anchored loop formation and cohesin positioning.

Main Methods:

  • X-ray crystallography to determine the structure of SA2-SCC1-CTCF complex.
  • Biochemical assays to validate the functional significance of the interaction.

Main Results:

  • A specific N-terminal segment of CTCF interacts with SA2-SCC1 subunits of human cohesin.
  • The crystal structure reveals the molecular details of this interaction.
  • This interaction is crucial for CTCF-anchored loops and cohesin localization at binding sites.
  • A similar motif is found in other cohesin ligands, including WAPL.

Conclusions:

  • CTCF protects cohesin from loop release, thereby enabling chromatin loop formation.
  • This work provides fundamental insights into the dynamic regulation of genome folding by cohesin and CTCF.