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Crystallization and preliminary X-ray analysis of GlcNAc alpha 1,4Gal-releasing endo-beta-galactosidase from Clostridium perfringens.

The unique clostridial endo-beta-galactosidase (Endo-beta-Gal(GnGa)) capable of releasing the disaccharide GlcNAc alpha 1,4Gal from O-glycans expressed in the gastric gland mucous cell-type mucin has been crystallized. The crystal belongs to space group P6(3), with unit-cell parameters a = 160.4, c = 86.1 A. Under cryocooled conditions and using a synchrotron X-ray source, the crystals diffract to 1.82 A resolution. The asymmetric unit contains two or three molecules.