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Infect. Immun., Jun 1995, 2221-2227, Vol 63, No. 6
Copyright © 1995, American Society for Microbiology

Molecular analysis of neutralizing epitopes on outer surface proteins A and B of Borrelia burgdorferi

J Ma, C Gingrich-Baker, PM Franchi, P Bulger and RT Coughlin
Cambridge Biotech Corporation, Worcester, Massachusetts 01605, USA.

The neutralizing epitopes of the major outer surface proteins A and B (OspA and OspB) of Borrelia burgdorferi B31 were investigated by epitope mapping using overlapping synthetic peptides, encompassing full- length OspA and OspB, and antiborrelial monoclonal antibodies (MAbs). OspA MAb N4B12 and OspB MAbs N5G5, W7C2, and P4D1 displayed a complement-independent antiborrelial activity, and complement failed to enhance the antiborrelial activity, as measured by a sensitive colorimetric assay. A combination of N4B12 with N5G5 displayed a higher antiborrelial activity than did the MAbs individually. OspA MAbs B3G11 and L3B5, however, exhibited a significant antiborrelial activity only in the presence of complement. Epitope mapping showed that B3G11 bound to one OspA synthetic peptide with the sequence of amino acids 247 to 256 (QYDSNGTKLE) and produced more than sixfold-higher reactivity than with other sequences, as measured by an enzyme-linked immunosorbent assay. OspB MAb N5G5 bound to an OspB peptide with the sequence of amino acids 211 to 220 (TLKREIEKDG), yielding at least threefold-higher reactivity than with other sequences. These two peptide sequences were found to contain neutralizing epitopes. Other MAbs had weak binding activities with the synthetic peptides, and their specific epitopes remain to be further analyzed. Thus, this study demonstrated both complement-independent and complement-dependent antiborrelial MAbs and identified the linear epitopes on OspA and OspB capable of inducing neutralizing antibody responses.

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