ID 2.4.1.134 DE galactosylxylosylprotein 3-beta-galactosyltransferase. AN galactosyltransferase II. AN uridine diphosphogalactose-galactosylxylose galactosyltransferase. CA 3-O-(beta-D-galactosyl-(1->4)-beta-D-xylosyl)-L-seryl-[protein] + UDP- CA alpha-D-galactose = 3-O-(beta-D-galactosyl-(1->3)-beta-D-galactosyl- CA (1->4)-beta-D-xylosyl)-L-seryl-[protein] + H(+) + UDP. CC -!- Involved in the biosynthesis of the linkage region of CC glycosaminoglycan chains as part of proteoglycan biosynthesis CC (chondroitin, dermatan and heparan sulfates). DR Q96L58, B3GT6_HUMAN; Q91Z92, B3GT6_MOUSE; Q9USX0, PVG3_SCHPO ; DR Q9N491, SQV2_CAEEL ; //