Abstract
IS the affinity maturation of antibodies under thermodynamic or kinetic control, or both? We compared the physical constants of hapten binding by antibodies from 2-phenyl-5-oxazolone-specific hybridomas from primary, secondary and tertiary responses. In addition to an increase in equilibrium constant, there was a shift in the antibody repertoire after the primary response towards an immunoglobulin family with an extremely high on-rate constant. This shift occurred in spite of the average or below-average affinity of this group of antibodies. This is consistent with B-lymphocyte proliferation being subject to a kinetic selection, with a premium on binding target antigens rapidly, in parallel with a thermodynamic selection based on binding tightly
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Foote, J., Milstein, C. Kinetic maturation of an immune response. Nature 352, 530–532 (1991). https://doi.org/10.1038/352530a0
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DOI: https://doi.org/10.1038/352530a0
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