Related Experiment Video

Updated: May 5, 2026

Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands
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Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands

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Structure and function of the CSL-KyoT2 corepressor complex: a negative regulator of Notch signaling

Kelly J Collins1, Zhenyu Yuan1, Rhett A Kovall1

  • 1Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, OH 45267 USA.

Structure (London, England : 1993)
|December 3, 2013
PubMed

Insights

Researchers uncovered how KyoT2 binds to CSL, a key protein in Notch signaling. This binding regulates gene transcription, impacting development and disease. Understanding this interaction is crucial for controlling Notch pathway activity.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cell Signaling

Background:

  • The Notch signaling pathway is crucial for embryonic development and tissue homeostasis.
  • CSL acts as a central nuclear effector, regulating Notch target genes by interacting with coactivators and corepressors.
  • While CSL-coactivator structures are known, CSL-corepressor complex structures remain elusive.

Purpose of the Study:

  • To elucidate the molecular mechanism of CSL interaction with the corepressor KyoT2.
  • To understand how KyoT2 binding to CSL influences transcriptional regulation.
  • To provide structural insights into CSL's dual role as an activator and repressor.

Main Methods:

  • X-ray crystallography to determine complex structures.
  • Biophysical assays to assess binding affinities.
  • Cellular assays to evaluate functional consequences.

Main Results:

  • The structure of the CSL-KyoT2 complex was determined.
  • KyoT2 binds CSL with high affinity.
  • KyoT2 competes with coactivators for CSL binding, inhibiting Notch signaling.

Conclusions:

  • KyoT2 acts as a potent corepressor by competitively inhibiting coactivator binding to CSL.
  • These findings offer molecular insights into CSL-mediated transcriptional repression in Notch signaling.
  • Understanding these interactions is vital for therapeutic strategies targeting Notch-related diseases.

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