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. 1983 Mar 1;209(3):857–863. doi: 10.1042/bj2090857

Degradation of human complement component C4b in the presence of the C4b-binding protein-protein S complex.

B Dahlbäck, B Hildebrand
PMCID: PMC1154166  PMID: 6223626

Abstract

Vitamin K-dependent protein S and the higher-molecular-weight form of C4b-binding protein (C4bp-high) interact, forming a 1:1 complex with a KD of approx. 1 X 10(-7) M [Dahlbäck (1983) Biochem. J. 209, 847-856]. In the present study the effect of protein S on the degradation of C4b by Factor I (C3b inactivator) and C4bp was investigated both in fluid phase and on cell surfaces, with the use of highly purified components. Fluid-phase degradation of C4b was monitored on sodium dodecyl sulphate/polyacrylamide-slab-gel electrophoresis, and the effect on surface-bound C4b was estimated by haemolytic assay. No effect of protein S could be demonstrated in any of the systems used. Thus, although bound to C4bp, protein S is neither involved in, nor does it affect, the interaction between C4bp and C4b. This indicates that the binding sites on the C4bp molecule for protein S and for C4b are independent and different.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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