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Related Experiment Videos

Solubilization of a functionally active platelet-activating factor receptor from rabbit platelets.

J E Rogers1, V Duronio, S I Wong

  • 1Department of Medicine, University of British Columbia, Vancouver, Canada.

The Biochemical Journal
|September 1, 1991
PubMed
Summary

Researchers successfully solubilized the platelet-activating factor (PAF) receptor from rabbit platelets, retaining its binding activity. This marks a significant step in understanding the molecular nature of this crucial cell receptor.

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Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Platelet-activating factor (PAF) binding to its high-affinity membrane receptor is crucial in many cell types.
  • The molecular identity of the PAF receptor remains largely unknown.

Purpose of the Study:

  • To characterize the molecular properties of the solubilized PAF receptor from rabbit platelets.
  • To investigate the binding characteristics and molecular mass of the active solubilized PAF receptor.

Main Methods:

  • Solubilization of rabbit platelet PAF receptor using various detergents (CHAPS, digitonin, etc.).
  • Gel filtration chromatography (Bio-Gel A-0.5 m) to determine molecular mass.
  • Ligand binding assays with [3H]PAF and PAF antagonists.
  • Enzymatic treatments (heat, trypsin) to assess receptor integrity.

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Main Results:

  • The PAF receptor solubilized with CHAPS retained binding activity without pre-bound ligand.
  • The solubilized receptor exists as a high molecular mass complex (>350 kDa).
  • Binding equilibrium was reached faster at room temperature than at 0°C, with high affinity (Kd ≈ 2.5 nM).
  • Heat and trypsin inactivated binding, indicating a protein component, with trypsin affecting solubilized receptor more than whole cells.

Conclusions:

  • The study successfully characterized the biophysical properties of the solubilized PAF receptor.
  • The findings suggest the PAF receptor is a protein complex, and its binding site may not be accessible on the cell surface.