Cook W J, Koszalka G W, Hall W W, Narayana S V, Ealick S E
J Biol Chem. 1987 Feb 25;262(6):2852-3.
Crystals of uridine phosphorylase from Escherichia coli K12 have been grown from solutions of polyethylene glycol 4000. The crystals are trigonal, space group R3; the hexagonal axes are a = 154.4 A and c = 49.4 A. The crystals are quite stable to x-rays and diffract beyond 2.6 A resolution. It appears that the molecule is a hexamer with a subunit molecular weight of 27,500 and utilizes the 3-fold symmetry of the space group, resulting in two subunits/asymmetric unit.
