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Models for the C1 complex determined by physical techniques.

S J Perkins1

  • 1Department of Biochemistry, Royal Free Hospital School of Medicine, London, U.K.

Behring Institute Mitteilungen
|July 1, 1989
PubMed
Summary
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The C1 complex, crucial for immune response, involves C1q, C1r, and C1s proteins. New structural data reveals C1q

Area of Science:

  • Biochemistry
  • Structural Biology
  • Immunology

Background:

  • The C1 complex initiates the classical complement pathway, a vital part of the innate immune system.
  • Understanding the precise structure of the C1 complex is essential for elucidating its function in immune responses.

Purpose of the Study:

  • To determine the solution structure of the C1 complex subcomponents (C1q, C1r, C1s) and their assembled form.
  • To refine structural models of the C1 complex based on biophysical data and protein structure prediction.

Main Methods:

  • Neutron scattering and ultracentrifugation were employed to analyze the solution structure of C1q, C1r, and C1s.
  • Protein structure prediction techniques supplemented experimental data for modeling.

Main Results:

Related Experiment Videos

  • Solution data indicated C1q arms are 14.5 nm long with an average arm-axis angle of 40 degrees, revealing flexibility at the junction.
  • C1r and C1s are elongated (18-20 nm) macromolecules, with their domains arranged linearly.
  • The C1r2 dimer exhibits an X-shaped association, consistent with electron microscopy findings.

Conclusions:

  • Four distinct models for the C1 complex were reviewed, with the W-model favored.
  • The W-model, positioning C1r and C1s monomers on C1q arms, best explains the known properties of the C1 complex.