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Related Experiment Videos

Interaction between complement subcomponent C1q and bacterial lipopolysaccharides.

A Zohair1, S Chesne, R H Wade

  • 1Laboratoire d'Immunochimie, INSERM Unité 238, Université J. Fourier et DRF-Grenoble, France.

The Biochemical Journal
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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Escherichia coli D31m4 binds complement subcomponent C1q and its fragments, with lipopolysaccharides (LPS) and specifically its KDO component playing a key role in this interaction.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • The complement system plays a crucial role in innate immunity.
  • Complement subcomponent C1q initiates the classical complement pathway.
  • Understanding C1q interactions with bacterial components is vital for immune evasion studies.

Purpose of the Study:

  • To investigate the binding of C1q and its collagen-like fragments (C1qCLF) to a heptose-less Escherichia coli mutant (D31m4).
  • To elucidate the role of lipopolysaccharides (LPS) in this binding interaction.
  • To identify specific components of LPS responsible for C1q binding.

Main Methods:

  • Binding assays using purified C1q and C1qCLF with E. coli D31m4 and liposomes containing purified LPS.
  • Chemical modification of C1q, C1qCLF, and LPS using diethyl pyrocarbonate (DEPC).

Related Experiment Videos

  • Liposome flotation assays to quantify binding.
  • Analysis of LPS modifications, including the removal of 3-deoxy-D-manno-octulosonic acid (KDO).

    • Main Results:

    • E. coli D31m4 bound C1q and C1qCLF, with binding suppressed by chemical modification.
    • Liposomes containing LPS from E. coli D31m4 and wild-type E. coli K-12 S bound C1q and C1qCLF.
    • Binding to LPS was inhibited by diamines and significantly reduced (65%) upon removal of KDO from LPS, with complete abolition in liposomes.
    • Direct binding of C1q or C1qCLF to bacteria was negligible.

    Conclusions:

    • The collagen-like moiety of C1q, likely involving histidine residues, is essential for binding to E. coli D31m4.
    • Lipopolysaccharides (LPS) contribute significantly to C1q binding.
    • The anionic charges of 3-deoxy-D-manno-octulosonic acid (KDO) within LPS are critical for mediating the interaction between C1q and E. coli.