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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Mar;80(6):1698–1702. doi: 10.1073/pnas.80.6.1698

Polymorphism of human erythrocyte C3b/C4b receptor.

T R Dykman, J L Cole, K Iida, J P Atkinson
PMCID: PMC393670  PMID: 6572933

Abstract

The human erythrocyte receptor for the major activation fragments of the third and fourth components of complement (HuE-C3bR) was isolated from individual donors. Erythrocytes were surface labeled with 125I and solubilized in Nonidet P-40.HuE-C3bR was purified by using C3-Sepharose affinity chromatography and analyzed by autoradiography of NaDodSO4/polyacrylamide gels. Three distinct receptor patterns were demonstrated. Type a had a single major band with Mr of 190,000, type b had a single major band with Mr of 220,000, and type c had two major bands of Mr 190,000 and 220,000. In all three types, a minor band accounting for less than 25% of the total radioactivity was usually observed at a Mr 15,000 greater than that of each major band. Identical autoradiographic patterns were obtained by affinity chromatography using methylamine-inactivated C4-Sepharose or by immunoprecipitation of solubilized membranes with a monoclonal antibody against HuE-C3bR. All three types were distinct after reduction and alkylation, although the apparent Mr uniformly increased by approximately equal to 30,000. Characterization of HuE-C3bR types in 33 unrelated individuals demonstrated that 23 had type a, 1 had type b, and 9 had type c. Family studies provide evidence for transmission by two codominant alleles. Thus, in the normal population two alleles appear to control expression of HuE-C3bR phenotypes and account for the polymorphism of this integral membrane glycoprotein.

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Selected References

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