Glucose/D-mannose specific lectin. Homotetramer. 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 (By similarity). Residues 1-118 of the mature chain, as displayed here, probably constitute the beta chain in the propeptide, residues 119-237 the gamma chain (Probable). 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.