Tags: Enzyme.
In enzymology a galactosylxylosylprotein 3-beta-galactosyltransferase (EC 2.4.1.134) is an enzyme that catalyzes the chemical reactionUDP-galactose + 4-beta-D-galactosyl-O-beta-D-xylosylprotein UDP + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylproteinThus the two substrates of this enzyme are UDP-galactose and 4-beta-D-galactosyl-O-beta-D-xylosylprotein whereas its two products are UDP and 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein.This enzyme belongs to the family of glycosyltransferases specifically the hexosyltransferases.