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Related Experiment Videos

Phospholipid-independent and -dependent interactions required for tissue factor receptor and cofactor function.

W Ruf1, A Rehemtulla, J H Morrissey

  • 1Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

The Journal of Biological Chemistry
|February 5, 1991
PubMed
Summary

Tissue factor (TF) membrane anchoring localizes proteolysis. A TF mutant lacking membrane domains showed phospholipid interactions are crucial for TF.VIIa complex assembly and factor X activation in coagulation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Tissue Factor (TF) initiates coagulation by binding Factor VIIa (VIIa).
  • Membrane anchoring of TF is crucial for localizing proteolysis at the cell surface.
  • The role of phospholipid interactions in TF.VIIa complex assembly and substrate presentation requires further elucidation.

Purpose of the Study:

  • To investigate the role of phospholipid interactions in the assembly of the catalytic TF.VIIa complex.
  • To evaluate the function of the TF transmembrane domain in membrane anchoring and reaction localization.
  • To determine how TF and phospholipid interactions enhance factor X cleavage.

Main Methods:

  • A recombinant TF mutant (TF1-219) lacking membrane-spanning and intracellular domains was engineered.

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  • TF1-219 was expressed and secreted by cells.
  • Kinetic analysis of factor X cleavage by free VIIa, TF.VIIa, and TF1-219.VIIa in the presence and absence of phospholipids was performed.

    • Main Results:

    • TF1-219 was secreted and did not stably associate with phospholipids, unlike membrane-bound TF.
    • TF.VIIa complex formation enhances the catalytic function of VIIa, independent of lipid presence.
    • TF1-219.VIIa preferentially cleaved factor X when presented on phospholipid surfaces.

    Conclusions:

    • TF membrane anchoring is essential for localizing coagulation proteolysis.
    • The TF extracellular domain enhances VIIa catalytic activity through protein-protein interactions.
    • Phospholipid surfaces play a critical role in presenting factor X as a substrate for TF-initiated coagulation.