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Multimerin

C P Hayward1, J G Kelton

  • 1McMaster University Medical Centre, Hamilton, Ontario, Canada.

Current Opinion in Hematology
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

Multimerin is a novel, large protein found in platelets and blood vessels. It binds to Factor V/Va, suggesting a role in hemostasis (blood clotting) that is currently being investigated.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Multimerin is a large, disulfide-linked protein complex found in platelets and endothelial cells.
  • It is synthesized from a precursor protein, promultimerin, undergoing post-translational modifications like N-glycosylation.
  • Its structure includes unique domains (Arg-Gly-Asp-Ser, coiled-coil, EGF-like) and resembles complement C1q and collagen domains.

Purpose of the Study:

  • To characterize the novel protein multimerin.
  • To investigate the function of multimerin in hemostasis.
  • To identify binding partners of multimerin.

Main Methods:

  • Complementary DNA sequencing to identify novel protein domains.
  • Analysis of protein structure and post-translational modifications.

Related Experiment Videos

  • Cellular expression studies in megakaryocytes and endothelial cells.
  • Investigation of protein localization within platelet alpha granules and endothelial Weibel-Palade bodies.

    • Main Results:

    • Multimerin is a novel protein with distinct structural domains and similarity to C1q and collagens.
    • It is expressed by megakaryocytes and endothelial cells and stored in specific cellular compartments.
    • Multimerin is released upon cellular activation and binds to cells and extracellular matrix.
    • Recent findings identify multimerin as a specific binding protein for Factor V/Va, complexed within platelet alpha granules.

    Conclusions:

    • Multimerin is a newly identified protein with a unique structure and cellular localization.
    • Its interaction with Factor V/Va suggests a significant role in hemostasis.
    • Further research is needed to fully elucidate the function of multimerin in blood clotting processes.