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Biotinylation: a simple method for labelling complement component C8 with preservation of functional activity.

S Bhakdi1, M Roth, F Hugo

  • 1Institute of Medical Microbiology, University of Giessen, F.R.G.

Journal of Immunological Methods
|July 6, 1989
PubMed
Summary
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Biotinylation effectively labels human C8 complement component, preserving its function. This method allows detection of biotinylated C8 and terminal complement complexes in various forms.

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • The terminal complement pathway is crucial in innate and adaptive immunity.
  • Human C8 is a key component of the terminal complement complex (TCC).
  • Accurate detection and quantification of C8 and TCC are essential for understanding complement-mediated processes.

Purpose of the Study:

  • To evaluate biotinylation as a method for labeling human C8.
  • To assess the functional preservation of biotinylated C8.
  • To establish methods for detecting biotinylated C8 and its incorporation into terminal complement complexes.

Main Methods:

  • Biotinylation of purified human C8 using biotinylamidohexanoic acid, N-hydroxysulfosuccinimide ester.
  • Detection of biotinylated C8 and C5b-9 complexes using Western blotting, crossed immunoblotting, ELISA, and immunocytochemistry.

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Main Results:

  • Biotinylation successfully labeled human C8 while preserving its functional activity.
  • Biotinylated C8 was detectable in its native form and when incorporated into terminal complement complexes.
  • The developed detection assays were effective for both soluble and membrane-bound forms of C8 and C5b-9.

Conclusions:

  • Biotinylation is a valuable technique for labeling human C8.
  • This method facilitates the detection and quantification of C8 and terminal complement complexes.
  • Biotinylation offers an attractive alternative for studying complement activation and function.