The human antibody response to the capsular polysaccharide of Streptococcus pneumoniae type 23F is predominated by antibodies which express either VkappaL6 or VkappaA23 light chain genes. In this report, we demonstrate that the antigenic epitopes recognized by these two families can be differentiated based on their specificity for the hapten l-rhamnose, a constituent sugar of the bacterial capsule polymer. The VkappaL6 family utilizes light chains with an unusually long third complementarity-determining region. These VkappaL6-encoded Fabs are 100-fold more sensitive to inhibition with l-rhamnose than VkappaA23 Fabs. VkappaL6 Fabs preferentially recognize the l-isomer of the hapten and can distinguish l-rhamnose from the structurally similar sugar l-mannose. We also demonstrate that the VkappaL6 family component of the antibody response recognizes the polysaccharide antigens of Group B streptococci (GBS), thereby accounting for the previously reported cross-reaction between PPS 23F-specific antisera and Group B streptococci.
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