Dubiumin, a chymotrypsin-like serine protease from the seeds of Solanum dubium Fresen

Solanum dubium Fresen, a weed plant in the family Solanaceae, is locally known in Sudan as Gubbien because of its milk-clotting ability. A highly stable serine protease from the seeds of this plant was purified and characterized. Its enzymatic characteristics suggest possible application of the enzyme in food and biotechnological industries.