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Related Experiment Videos

Calcium-linked self-association of human complement C1s.

G Rivas1, K C Ingham, A P Minton

  • 1Laboratory of Biochemical Pharmacology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.

Biochemistry
|December 1, 1992
PubMed
Summary

Calcium ions drive the self-association of C1s, a complement system protein. This dimerization, crucial for complement activation, is mediated by specific calcium binding sites on the C1s dimer.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • The human complement system is a critical part of innate immunity.
  • C1s is an activated serine protease and a subcomponent of the C1 complex.
  • Understanding C1s function requires knowledge of its oligomeric states and regulation.

Purpose of the Study:

  • To investigate the molecular weight and self-association of C1s.
  • To elucidate the role of calcium ions in C1s dimerization.
  • To characterize the calcium binding properties of C1s monomer and dimer.

Main Methods:

  • Sedimentation equilibrium ultracentrifugation was used to measure molecular weight.
  • Experiments were conducted across a range of protein and calcium ion concentrations.

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  • Data were analyzed using a quantitative model for self-association.

    • Main Results:

    • C1s undergoes Ca(2+)-dependent self-association to form a dimer.
    • The C1s monomer has one calcium binding site (K ≈ 3 x 10^5 M⁻¹).
    • The C1s dimer possesses three distinct calcium binding sites with varying affinities.

    Conclusions:

    • Calcium ions are essential regulators of C1s oligomerization.
    • A high-affinity calcium binding site at the dimer interface drives C1s dimerization.
    • This calcium-mediated dimerization is fundamental to the function of the C1 complex in complement activation.