ID   2.4.1.165
DE   N-acetylneuraminylgalactosylglucosyl-glucoside beta-1,4-N-
DE   acetylgalactosaminyltransferase.
AN   N-acetylneuraminylgalactosylglucosylceramide beta-1,4-N-
AN   acetylgalactosaminyltransferase.
CA   an N-acetyl-alpha-neuraminyl-(2->3)-beta-D-galactosyl derivative + UDP-N-
CA   acetyl-alpha-D-galactosamine = an N-acetyl-beta-D-galactosaminyl-(1->4)-
CA   [N-acetyl-alpha-neuraminyl-(2->3)]-beta-D-galactosyl derivative + UDP +
CA   H(+).
CC   -!- Requires Mn(2+).
CC   -!- The enzyme, found in mammals, is only active with substrates
CC       containing (2->3) linked sialic acid residues.
CC   -!- It is active with glycoproteins, but not with gangliosides. The
CC       enzyme is involved in synthesis of the blood group antigen Sd(a).
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