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Antibodies having light (L) chains encoded by the kappaII-A2 variable region gene segment predominate in the human response to the Haemophilus influenzae type b polysaccharide (Hib PS). To determine whether the closely related homologue of the A2 gene, the kappaII-A18 gene, has the potential to contribute to the repertoire, we examined Hib PS binding to a series of recombinant Fab fragments having either A2 or A18 L chains isolated from a Hib PS-vaccinated adult. The ability to bind Hib PS resided exclusively with those Fab fragments having A2 and containing an insertional arginine at the variable-joining junction. Thus, despite the sequence similarity between A2 and A18, only A2 contributes to the canonical Hib PS paratope.

Polysaccharide Binding Potential of the Human A2 or A18 Kappa Light Chain Homologues