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Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation
08:47

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Published on: March 5, 2018

CLEC-2 activates Syk through dimerization.

Craig E Hughes1, Alice Y Pollitt, Jun Mori

  • 1Centre for Cardiovascular Sciences, Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.

Blood
|February 16, 2010
PubMed
Summary
This summary is machine-generated.

The C-type lectin receptor CLEC-2 activates platelets via Syk kinase. This study reveals CLEC-2 forms dimers upon activation, enabling Syk cross-linking and unique signaling.

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Last Updated: Jun 16, 2026

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Area of Science:

  • Immunology
  • Cell Signaling
  • Biochemistry

Background:

  • C-type lectin receptor CLEC-2 initiates platelet activation.
  • Signaling involves Src and Syk tyrosine kinases and downstream effectors like phospholipase-C gamma2.
  • CLEC-2 utilizes a YxxL motif for initiating signaling, similar to immunoreceptor tyrosine-based activation motifs.

Purpose of the Study:

  • To elucidate the mechanism of Syk activation by CLEC-2.
  • To investigate the role of CLEC-2 stoichiometry in Syk activation.
  • To characterize the unique Syk activation pathway employed by CLEC-2.

Main Methods:

  • Peptide pull-down assays
  • Surface plasmon resonance
  • Quantitative Western blotting
  • Tryptophan fluorescence measurements
  • Competition experiments
  • Cross-linking studies
  • Electron microscopy

Main Results:

  • Syk activation by CLEC-2 is mediated by cross-linking through Syk tandem SH2 domains at a 2:1 stoichiometry.
  • CLEC-2 exists as a dimer in resting platelets.
  • CLEC-2 forms larger complexes upon platelet activation.
  • This represents a unique Syk activation mechanism by a single YxxL-containing receptor.

Conclusions:

  • CLEC-2 dimer formation and subsequent cross-linking of Syk tandem SH2 domains are critical for Syk activation.
  • The findings reveal a novel mechanism of Syk activation distinct from typical immunoreceptor tyrosine-based activation motif pathways.
  • This study provides new insights into platelet signaling pathways regulated by CLEC-2.