Crystallization of barley (1-3,1-4)-beta-glucanase, isoenzyme II

The (1-3,1-4)-beta-glucanase from barley (Hordeum vulgare, cv Alexis) degrades mixed linked beta-glucan in the cell wall of the starchy endosperm. Isoenzyme II of the (1-3,1-4)-beta-glucanase forms large single crystals when a protein solution is equilibrated against 20% (w/w) polyethylene glycol 8000 at acidic pH using the hanging drop vapour diffusion method. The crystals diffract to better than 2 A resolution. They are monoclinic, space group P2(1), with cell dimensions a = 49.58 A, b = 82.99 A, c = 77.56 A and beta = 104.36 degrees. Two protein molecules are estimated to fill the asymmetric unit.