ID   2.4.3.4
DE   beta-galactoside alpha-2,3-sialyltransferase.
CA   a beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl derivative +
CA   CMP-N-acetyl-beta-neuraminate = an N-acetyl-alpha-neuraminyl-(2->3)-beta-
CA   D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl derivative + CMP +
CA   H(+).
CC   -!- The acceptor is Galbeta-(1->3)-GalNAc-R, where R is H, a threonine or
CC       serine residue in a glycoprotein, or a glycolipid.
CC   -!- Lactose can also act as acceptor.
CC   -!- May be identical with EC 2.4.3.2.
CC   -!- Formerly EC 2.4.99.4.
DR   Q11200, SIA4A_CHICK;  Q11201, SIA4A_HUMAN;  P54751, SIA4A_MOUSE;
DR   Q6KB59, SIA4A_PANTR;  Q02745, SIA4A_PIG  ;  Q16842, SIA4B_HUMAN;
DR   Q11204, SIA4B_MOUSE;  Q6KB58, SIA4B_PANTR;  Q11205, SIA4B_RAT  ;
DR   Q11206, SIA4C_HUMAN;  Q91Y74, SIA4C_MOUSE;  P61130, SIA4C_PANTR;
DR   P61131, SIA4C_RAT  ;
//