1. Oxidoreductases

 2. Transferases

   2.1  Transferring one-carbon groups

   2.2  Transferring aldehyde or ketonic groups

   2.3  Acyltransferases

   2.4  Glycosyltransferases

   2.5  Transferring alkyl or aryl groups, other than methyl groups

   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

     2.7.6  Diphosphotransferases

     2.7.7  Nucleotidyltransferases

       2.7.7.1  nicotinamide-nucleotide adenylyltransferase

       2.7.7.2  FAD synthase

       2.7.7.3  pantetheine-phosphate adenylyltransferase

       2.7.7.4  sulfate adenylyltransferase

       2.7.7.5  sulfate adenylyltransferase (ADP)

       2.7.7.6  DNA-directed RNA polymerase

       2.7.7.7  DNA-directed DNA polymerase

       2.7.7.8  polyribonucleotide nucleotidyltransferase

       2.7.7.9  UTP---glucose-1-phosphate uridylyltransferase

       2.7.7.10  UTP---hexose-1-phosphate uridylyltransferase

       2.7.7.11  UTP---xylose-1-phosphate uridylyltransferase

       2.7.7.12  UDP-glucose---hexose-1-phosphate uridylyltransferase

       2.7.7.13  mannose-1-phosphate guanylyltransferase

       2.7.7.14  ethanolamine-phosphate cytidylyltransferase

       2.7.7.15  choline-phosphate cytidylyltransferase

       2.7.7.18  nicotinate-nucleotide adenylyltransferase

       2.7.7.19  polynucleotide adenylyltransferase

       2.7.7.22  mannose-1-phosphate guanylyltransferase (GDP)

       2.7.7.23  UDP-N-acetylglucosamine diphosphorylase

       2.7.7.24  glucose-1-phosphate thymidylyltransferase

       2.7.7.27  glucose-1-phosphate adenylyltransferase

       2.7.7.28  nucleoside-triphosphate-aldose-1-phosphate nucleotidyltransferase

       2.7.7.30  fucose-1-phosphate guanylyltransferase

       2.7.7.31  DNA nucleotidylexotransferase

       2.7.7.32  galactose-1-phosphate thymidylyltransferase

       2.7.7.33  glucose-1-phosphate cytidylyltransferase

       2.7.7.34  glucose-1-phosphate guanylyltransferase

       2.7.7.35  ADP ribose phosphorylase

       2.7.7.36  aldose-1-phosphate adenylyltransferase

       2.7.7.37  aldose-1-phosphate nucleotidyltransferase

       2.7.7.38  3-deoxy-manno-octulosonate cytidylyltransferase

       2.7.7.39  glycerol-3-phosphate cytidylyltransferase

       2.7.7.40  D-ribitol-5-phosphate cytidylyltransferase

       2.7.7.41  phosphatidate cytidylyltransferase

       2.7.7.42  [glutamine synthetase] adenylyltransferase

       2.7.7.43  N-acylneuraminate cytidylyltransferase

       2.7.7.44  glucuronate-1-phosphate uridylyltransferase

       2.7.7.45  guanosine-triphosphate guanylyltransferase

       2.7.7.46  gentamicin 2''-nucleotidyltransferase

       2.7.7.47  streptomycin 3''-adenylyltransferase

       2.7.7.48  RNA-directed RNA polymerase

       2.7.7.49  RNA-directed DNA polymerase

       2.7.7.50  mRNA guanylyltransferase

       2.7.7.51  adenylylsulfate---ammonia adenylyltransferase

       2.7.7.52  RNA uridylyltransferase

       2.7.7.53  ATP adenylyltransferase

       2.7.7.56  tRNA nucleotidyltransferase

       2.7.7.57  N-methylphosphoethanolamine cytidylyltransferase

       2.7.7.59  [protein-PII] uridylyltransferase

       2.7.7.60  2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase

       2.7.7.61  citrate lyase holo-[acyl-carrier protein] synthase

       2.7.7.62  adenosylcobinamide-phosphate guanylyltransferase

       2.7.7.64  UTP-monosaccharide-1-phosphate uridylyltransferase

       2.7.7.65  diguanylate cyclase

       2.7.7.66  malonate decarboxylase holo-[acyl-carrier protein] synthase

       2.7.7.67  CDP-2,3-bis-(O-geranylgeranyl)-sn-glycerol synthase

       2.7.7.68  2-phospho-L-lactate guanylyltransferase

       2.7.7.69  GDP-L-galactose/GDP-D-glucose: hexose 1-phosphate guanylyltransferase

       2.7.7.70  D-glycero-beta-D-manno-heptose 1-phosphate adenylyltransferase

       2.7.7.71  D-glycero-alpha-D-manno-heptose 1-phosphate guanylyltransferase

       2.7.7.72  CCA tRNA nucleotidyltransferase

       2.7.7.73  sulfur carrier protein ThiS adenylyltransferase

       2.7.7.74  1L-myo-inositol 1-phosphate cytidylyltransferase

       2.7.7.75  molybdopterin adenylyltransferase

       2.7.7.76  molybdenum cofactor cytidylyltransferase

       2.7.7.77  molybdenum cofactor guanylyltransferase

       2.7.7.78  GDP-D-glucose phosphorylase

       2.7.7.79  tRNAHis guanylyltransferase

       2.7.7.80  molybdopterin-synthase adenylyltransferase

       2.7.7.81  pseudaminic acid cytidylyltransferase

       2.7.7.82  CMP-N,N'-diacetyllegionaminic acid synthase

       2.7.7.83  UDP-N-acetylgalactosamine diphosphorylase

       2.7.7.84  2'-5' oligoadenylate synthase

       2.7.7.85  diadenylate cyclase

       2.7.7.86  cyclic GMP-AMP synthase

       2.7.7.87  L-threonylcarbamoyladenylate synthase

       2.7.7.88  GDP polyribonucleotidyltransferase

       2.7.7.89  [glutamine synthetase]-adenylyl-L-tyrosine phosphorylase

       2.7.7.90  8-amino-3,8-dideoxy-manno-octulosonate cytidylyltransferase

       2.7.7.91  valienol-1-phosphate guanylyltransferase

       2.7.7.92  3-deoxy-D-glycero-D-galacto-nonulopyranosonate cytidylyltransferase

       2.7.7.93  phosphonoformate cytidylyltransferase

       2.7.7.96  ADP-D-ribose pyrophosphorylase

       2.7.7.97  3-hydroxy-4-methylanthranilate adenylyltransferase

       2.7.7.99  N-acetyl-alpha-D-muramate 1-phosphate uridylyltransferase

       2.7.7.100  SAMP-activating enzyme

       2.7.7.101  DNA primase DnaG

       2.7.7.102  DNA primase AEP

       2.7.7.103  L-glutamine-phosphate cytidylyltransferase

       2.7.7.104  2-hydroxyethylphosphonate cytidylyltransferase

       2.7.7.105  phosphoenolpyruvate guanylyltransferase

       2.7.7.106  3-phospho-D-glycerate guanylyltransferase

       2.7.7.107  (2-aminoethyl)phosphonate cytidylyltransferase

       2.7.7.108  protein adenylyltransferase

     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

 3. Hydrolases

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases