D-mannose/D-glucose-binding lectin that also binds derivative alpha-methyl-D-mannppyranoside. Has hemagglutinating activity towards rabbit erythrocytes. Homotetramer; dimer of dimers. Concanavalin A-like lectins of the Diocleinae subtribe undergo proteolytic processing referred to as circular permutation. The propeptide is split into an N-terminal and a C-terminal part, the gamma and beta chain, respectively. These are then religated in beta-gamma order to form the mature alpha chain. The beta and gamma chains can often be detected in cell extracts. Residues 1-118 of the mature chain, as displayed here, probably constitute the beta chain in the propeptide, residues 119-236 the gamma chain. Binds one manganese (or another transition metal) ion and one calcium ion. The metal ions are essential for the saccharide-binding and cell-agglutinating activities. Belongs to the leguminous lectin family.