Structural evidence for recognition of a single epitope by two distinct antibodies - PubMed (original) (raw)
. 2000 Sep 1;40(4):572-8.
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- PMID: 10899782
Structural evidence for recognition of a single epitope by two distinct antibodies
D Fleury et al. Proteins. 2000.
Abstract
The structure of a complex between the hemagglutinin of influenza virus and the Fab of a neutralizing antibody was determined by X-ray crystallography at 2.8 A resolution. This antibody and another which has only 56% sequence identity bind to the same epitope with very similar affinities and in the same orientation. One third of the interactions is conserved in the two complexes; a significant proportion of the interactions that differ are established by residues of the H3 complementarity-determining regions (CDR) which adopt distinct conformations in the two antibodies. This demonstrates that there is a definite flexibility in the selection of antibodies that bind to a given epitope, despite the high affinity of their complexes. This flexibility allows the humoral immune response to be redundant, a feature that may be useful in achieving longer lasting protection against evolving viral pathogens.
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