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Related Experiment Videos

Factor XI apple domains and protein dimerization.

Q Cheng1, M-F Sun, D V Kravtsov

  • 1Department of Pathology, Vanderbilt University, Nashville, Tennessee 37232-6307, USA.

Journal of Thrombosis and Haemostasis : JTH
|November 25, 2003
PubMed
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Factor XI (FXI) is a dimer essential for its function. Researchers found that FXI apple domains A2 and A3 also contribute to dimer formation, stabilizing this crucial conformation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Structure

Background:

  • Factor XI (FXI) is a coagulation protease zymogen that exists as a disulfide bond-linked homodimer.
  • This dimeric configuration is essential for FXI secretion and biological function.
  • The non-catalytic portion of FXI includes four apple domains (A1-A4), with A4 previously identified as critical for dimerization.

Purpose of the Study:

  • To investigate the role of FXI apple domains beyond A4 in homodimer formation.
  • To determine if other apple domains contribute to the stabilization of the FXI dimer.

Main Methods:

  • Preparation of recombinant FXI/prekallikrein (PK) chimeras with exchanged apple domains.
  • Site-directed mutagenesis to alter cysteine residues involved in disulfide bond formation.

Related Experiment Videos

  • Analysis of dimer formation in modified chimeric proteins.

    • Main Results:

    • Chimeras with FXI A4 formed dimers, while those with PK A4 were monomers, confirming A4's role.
    • A modified PK A4 domain (PKA4-Gly326) enabled dimer formation even without FXI A4, indicating other domains contribute.
    • Substitution of FXI A3 partially inhibited dimer formation, and substitution of A2 or both A2 and A3 prevented it.

    Conclusions:

    • FXI apple domains A2 and A3 play a significant role in facilitating and stabilizing homodimer formation.
    • These domains likely contribute to stabilizing the dimeric conformation required for FXI's biological activities.