ID 2.4.1.133 DE xylosylprotein 4-beta-galactosyltransferase. AN galactosyltransferase I. AN UDP-D-galactose:D-xylose galactosyltransferase. AN UDP-D-galactose:xylose galactosyltransferase. AN uridine diphosphogalactose-xylose galactosyltransferase. CA 3-O-(beta-D-xylosyl)-L-seryl-[protein] + UDP-alpha-D-galactose = 3-O- CA (beta-D-galactosyl-(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 Q9VBZ9, B4GT7_DROME; Q9UBV7, B4GT7_HUMAN; Q8R087, B4GT7_MOUSE; DR P34548, SQV3_CAEEL ; //