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In enzymology, a glucosaminylgalactosylglucosylceramide beta-galactosyltransferase is an enzyme that catalyzes the chemical reaction
The 3 substrates of this enzyme are UDP-galactose, -beta-D-galactosyl--beta-D-]], and glucosyl--ceramide, whereas its 3 products are UDP, -N-acetyl-beta-D-glucosaminyl--beta-D-]], and -beta-D-glucosyl--ceramide]].
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-galactose:N-acetyl-beta-D-glucosaminyl--beta-D-galactosyl- -beta-D-glucosylceramide 3-beta-D-galactosyltransferase. Other names in common use include uridine, diphosphogalactose-acetyl-glucosaminylgalactosylglucosylceramide, galactosyltransferase, GalT-4, paragloboside synthase, glucosaminylgalactosylglucosylceramide 4-beta-galactosyltransferase, lactotriaosylceramide 4-beta-galactosyltransferase, UDP-galactose:N-acetyl-D-glucosaminyl-1,3-D-galactosyl-1,4-D-, glucosylceramide beta-D-galactosyltransferase, and UDP-Gal:LcOse3Cergalactosyltransferase.