ID   2.4.3.2
DE   beta-D-galactosyl-(1->3)-N-acetyl-beta-D-galactosaminide alpha-2,3-
DE   sialyltransferase.
AN   monosialoganglioside sialyltransferase.
CA   a beta-D-galactosyl-(1->3)-N-acetyl-beta-D-galactosaminyl derivative +
CA   CMP-N-acetyl-beta-neuraminate = an N-acetyl-alpha-neuraminyl-(2->3)-beta-
CA   D-galactosyl-(1->3)-N-acetyl-beta-D-galactosaminyl derivative + CMP +
CA   H(+).
CC   -!- The enzyme recognizes the sequence beta-D-galactosyl-(1->3)-N-acetyl-
CC       D-galactosaminyl (known as type 1 histo-blood group precursor
CC       disaccharide) in non-reducing termini of glycan moieties in
CC       glycoproteins and glycolipids.
CC   -!- When acting on gangloside GM1a, it forms gangloside GD1a.
CC   -!- Formerly EC 2.4.99.2.
DR   Q11201, SIA4A_HUMAN;  P54751, SIA4A_MOUSE;  Q6KB59, SIA4A_PANTR;
DR   Q02745, SIA4A_PIG  ;  Q16842, SIA4B_HUMAN;  Q11204, SIA4B_MOUSE;
DR   Q6KB58, SIA4B_PANTR;  Q11205, SIA4B_RAT  ;  Q11206, SIA4C_HUMAN;
DR   Q91Y74, SIA4C_MOUSE;  P61130, SIA4C_PANTR;  P61131, SIA4C_RAT  ;
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