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1 Oxidoreductases
2 Transferases
2.1 Transferring one-carbon groups
2.2 Transferring aldehyde or ketonic groups
2.2.1 Transketolases and transaldolases
2.3 Acyltransferases
2.4 Glycosyltransferases
2.4.1 Hexosyltransferases
2.4.2 Pentosyltransferases
2.4.3 Sialyltransferases
2.4.3.1 β-galactoside α-(2,6)-sialyltransferase
2.4.3.2 β-
D
-galactosyl-(1→3)-
N
-acetyl-β-
D
-galactosaminide α-2,3-sialyltransferase
2.4.3.3 α-
N
-acetylgalactosaminide α-2,6-sialyltransferase
2.4.3.4 β-galactoside α-2,3-sialyltransferase
2.4.3.5 galactosyldiacylglycerol α-2,3-sialyltransferase
2.4.3.6
N
-acetyllactosaminide α-2,3-sialyltransferase
2.4.3.7 α-
N
-acetylneuraminyl-2,3-β-galactosyl-1,3-
N
-acetylgalactosaminide 6-α-sialyltransferase
2.4.3.8 α-
N
-acetylneuraminate α-2,8-sialyltransferase
2.4.3.9 lactosylceramide α-2,3-sialyltransferase
2.4.3.10
N
-acetylglucosaminide α-(2,6)-sialyltransferase
2.4.99 Transferring other glycosyl groups
2.5 Transferring alkyl or aryl groups, other than methyl groups
2.5.1 Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to date)
2.6 Transferring nitrogenous groups
2.7 Transferring phosphorus-containing groups
2.7.1 Phosphotransferases with an alcohol group as acceptor
2.7.2 Phosphotransferases with a carboxy group as acceptor
2.7.3 Phosphotransferases with a nitrogenous group as acceptor
2.7.4 Phosphotransferases with a phosphate group as acceptor
2.7.5 Phosphotransferases with regeneration of donors, apparently catalysing intramolecular transfers (deleted sub-subclass)
2.7.6 Diphosphotransferases
2.7.7 Nucleotidyltransferases
2.7.8 Transferases for other substituted phosphate groups
2.7.9 Phosphotransferases with paired acceptors
2.7.10 Protein-tyrosine kinases
2.7.11 Protein-serine/threonine kinases
2.7.12 Dual-specificity kinases (those acting on Ser/Thr and Tyr residues)
2.7.13 Protein-histidine kinases
2.7.14 Protein-arginine kinases
2.7.99 Other protein kinases
2.8 Transferring sulfur-containing groups
2.9 Transferring selenium-containing groups
2.10 Transferring molybdenum- or tungsten-containing groups
2.10.1 Molybdenumtransferases or tungstentransferases with sulfide groups as acceptors
3 Hydrolases
4 Lyases
5 Isomerases
6 Ligases
7 Translocases