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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
. 1990 Jan;87(1):162–166. doi: 10.1073/pnas.87.1.162

Influence of the hinge region on complement activation, C1q binding, and segmental flexibility in chimeric human immunoglobulins.

L K Tan 1, R J Shopes 1, V T Oi 1, S L Morrison 1
PMCID: PMC53220  PMID: 2296577

Abstract

We have characterized a series of genetically engineered chimeric human IgG3 and IgG4 anti-dansyl (DNS) antibodies with identical antibody-combining sites but different hinge region amino acid compositions to determine how the hinge region influences Fab fragment segmental flexibility, C1q binding, and complement activation. Our data support the correlation between "upper hinge" length and Fab segmental flexibility; moreover, we confirm that a hinge region is essential for C1q binding and complement activation. However, the hinge length by itself is not sufficient for complement activity in IgG molecules. We have demonstrated that the IgG4 hinge, which imparts restricted segmental flexibility, reduces the ability of IgG3 molecules to activate complement. We also find that the IgG3 hinge region, which imparts greater segmental motion, is not sufficient to create complement activation activity in IgG4 anti-DNS antibodies. Finally, we conclude that (i) segmental motion is correlated with "upper hinge" length, (ii) hinge length and segmental flexibility is not enough to alter complement binding and activation, and (iii) segmental flexibility does not correlate with proficiency to activate the complement cascade.

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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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