In enzymology, a globotriaosylceramide 3-beta-N-acetylgalactosaminyltransferase () is an enzyme that catalyzes the chemical reaction
The 3 substrates of this enzyme are UDP-N-acetyl-D-galactosamine, alpha-D-galactosyl-(1->4)-beta-D-galactosyl-(1->4)-beta-D-glucosyl-, and (11)-ceramide, whereas its 3 products are UDP, N-acetyl-beta-D-galactosaminyl-(1->3)-alpha-D-galactosyl-(1->4)-, and beta-D-galactosyl-(1->4)-beta-D-glucosyl-(11)-ceramide.
Wrongly characterized previously as globotriosylceramide beta-1,6-N-acetylgalactosaminyl-transferase (
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-N-acetyl-D-galactosamine:alpha-D-galactosyl-(1->4)-beta-D-galact osyl-(1->4)-beta-D-glucosyl-(11)-ceramide III3-beta-N-acetyl-D-galactosaminyltransferase. This enzyme participates in glycosphingolipid biosynthesis - globoseries and glycan structures - biosynthesis 2.