2WGZ TRANSFERASE, GALACTOSYLTRANSFERASE, GLYCOPROTEIN, METAL-BINDING, SIGNAL-ANCHOR, ALPHA-1, MEMBRANE, MANGANESE, SUBSTRATE BINDING, GLYCOSYLTRANSFERASE, TRANSMEMBRANE, GOLGI APPARATUS, ENZYME KINETICS CRYSTAL STRUCTURE OF ALPHA-1,3 GALACTOSYLTRANSFERASE ( ALPHA3GT) IN A COMPLEX WITH P-NITROPHENYL-BETA-GALACTOSIDE (PNP-BETA-GAL)