Bolesatine is a glycoprotein isolated from the mushroom Rubroboletus satanas, a basidiomycete in the bolete family. Bolesatine has a lectin function that is specific to the sugar binding site of D-galactose. It is a monomeric protein with a compact globular structure and is thermostable. It is considered a lectin. It has a molecular mass of approximately 63 kDa. One tryptophan can be found in its primary sequence along with one disulfide bridge.