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Substrate Generation for Endonucleases of CRISPR/Cas Systems
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Substrate recognition by human separase.

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  • 1Department of Molecular and Cellular Biology, University of Geneva, Geneva, Switzerland.

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|November 12, 2025
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Summary
This summary is machine-generated.

Human separase cleaves the SCC1/RAD21 cohesin subunit to separate sister chromatids during cell division. This study reveals how separase recognizes and cleaves SCC1, elucidating a key mechanism in mitosis.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • The cohesin complex is essential for sister chromatid cohesion during mitosis.
  • Separase-mediated cleavage of the SCC1/RAD21 subunit triggers sister chromatid separation at anaphase onset.
  • The precise mechanisms of SCC1/RAD21 recognition and cleavage by separase remain incompletely understood.

Purpose of the Study:

  • To elucidate the structural and functional mechanisms regulating separase-mediated cleavage of SCC1/RAD21.
  • To identify substrate recognition sites and phosphorylation-dependent regulation of separase activity.
  • To understand how the cohesin complex is targeted by separase for cleavage.

Main Methods:

  • X-ray crystallography to determine structures of human separase (apo- and substrate-bound forms).
  • Biochemical analyses to study substrate interactions and cleavage kinetics.
  • Cross-linking mass spectrometry (XL-MS) and cryo-electron microscopy (cryo-EM) to investigate cohesin targeting.

Main Results:

  • Verified the first SCC1/RAD21 cleavage site and reassigned the second.
  • Identified docking sites on separase, including five phosphate-binding sites, crucial for substrate interaction.
  • Described the interaction between cohesin subunits SA1/SA2 and separase, promoting cleavage at the second SCC1 site.
  • Proposed a model for cohesin targeting by human separase.

Conclusions:

  • The study provides a detailed structural and functional framework for separase cleavage regulation.
  • Understanding separase-cohesin interaction is critical for comprehending cell division processes.
  • This work offers insights into a fundamental mechanism controlling chromosome segregation.