Reaction catalyzed by N-acetyllactosaminide alpha-2,3-sialyltransferase (2.4.3.6)
+
=
+
CMP-N-acetyl-beta-neuraminate
+
beta-D-N-acetylgalactosamine
=
CMP
+
alpha-Neu5Ac-(2->3)-beta-D-GalNAc