Sugar-binding protein showing significant affinity for (Glc alpha(1-4)Glc)(3) maltohexaose, (Glc alpha(1-6)Glc)(3) isomaltohexaose, Gal alpha(1-4)Gal beta(1-4)Glc, GalNAc alpha(1-3)(Fuc alpha(1-2)) and Gal beta(1-3)(Fuc alpha(1-4))GlcNAc beta(1-3)Gal beta(1-4)Glc. Component of the PYK10 complex, at least composed of PYK10/BGLU23, BGLU21, BGLU22, JAL22, JAL23, PBP1/JAL30, PBP2/JAL31, JAL32, JAL33, JAL34, JAL35, GLL22 and GLL23. Belongs to the jacalin lectin family.