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Related Experiment Videos

Vitronectin is a substrate for transglutaminases.

D C Sane1, T L Moser, A M Pippen

  • 1Department of Medicine, Duke University Medical Center, Durham, NC 27710.

Biochemical and Biophysical Research Communications
|November 30, 1988
PubMed
Summary
This summary is machine-generated.

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Vitronectin serves as a substrate for transglutaminases, enabling covalent cross-linking. This cross-linking of vitronectin may influence its role in the complement and coagulation systems.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Vitronectin (VN) is a key glycoprotein in plasma and extracellular matrix.
  • Transglutaminases are enzymes involved in protein cross-linking.
  • The role of VN as a substrate for transglutaminases is not fully understood.

Purpose of the Study:

  • To investigate whether vitronectin is a substrate for plasma transglutaminase (Factor XIIIa) and guinea pig liver transglutaminase (TG).
  • To identify the specific residues in VN involved in transglutaminase-catalyzed reactions.
  • To explore the potential functional consequences of VN cross-linking.

Main Methods:

  • Incubation of VN with purified TG and Factor XIIIa.
  • Use of [3H]-putrescine incorporation to detect reactive glutaminyl residues.

Related Experiment Videos

  • Analysis of covalent complex formation using SDS-PAGE and Western blotting.

    • Main Results:

    • Vitronectin was confirmed as a substrate for both Factor XIIIa and TG.
    • [3H]-putrescine incorporation demonstrated reactive glutaminyl residues in VN.
    • Multimeric VN complexes formed upon incubation with TG or Factor XIIIa, indicating VN also provides lysyl residues.

    Conclusions:

    • Vitronectin undergoes transglutaminase-mediated cross-linking.
    • This cross-linking involves both glutaminyl and lysyl residues of VN.
    • Cross-linking may modulate VN's function in hemostasis and the extracellular matrix.