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Three murine IgG1 monoclonal antibodies (MoAb) were produced against the glucose/mannose-specific two-chain mitogen from seeds of Lathyrus odoratus (sweet pea) belonging to the Vicieae tribe of the Leguminosae family. Their antigenic specificities were tested against subunits of two-chain and one-chain legume lectins separated by sodium dodecyl sulphate-polyacrylamide gel electrophoresis and electrotransferred to nitrocellulose filters. Different binding to native and detergent-treated lectins in dot-blots indicated that two of the antibodies bound to conformational epitopes which by immunoblotting were shown to be expressed on the heavy subunits from all the five tested two-chain lectins and on the six one-chain lectins, including PHA (Phaseolus vulgaris) and Con A (Canavalia ensiformis). However, ELISA cross-inhibition studies showed that these two antibodies bound to different epitopes on the lectin molecules. The third MoAb reacted with a continuous epitope not revealed by classical taxonomy since only three of five heavy subunits of the two-chain lectins stained with the antibody. Comparison of the known amino-acid sequences of the chains indicates eight positions as possible binding sites for this antibody.

Reactivity with Legume Lectins of Three Monoclonal Antibodies Made Against the Lathyrus odoratus Lectin