1. Oxidoreductases
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2. Transferases
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3. Hydrolases
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4. Lyases
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5. Isomerases
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6. Ligases
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6.1 Forming carbon-oxygen bonds
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6.2 Forming carbon-sulfur bonds
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6.3 Forming carbon-nitrogen bonds
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6.3.1 Acid-D-ammonia (or amine) ligases (amide synthases)
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6.3.2 Acid-D-amino-acid ligases (peptide synthases)
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6.3.2.1 pantoate---beta-alanine ligase (AMP-forming)
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6.3.2.2 glutamate---cysteine ligase
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6.3.2.3 glutathione synthase
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6.3.2.4 D-alanine---D-alanine ligase
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6.3.2.5 phosphopantothenate---cysteine ligase (CTP)
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6.3.2.6 phosphoribosylaminoimidazolesuccinocarboxamide synthase
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6.3.2.7 UDP-N-acetylmuramoyl-L-alanyl-D-glutamate---L-lysine ligase
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6.3.2.8 UDP-N-acetylmuramate---L-alanine ligase
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6.3.2.9 UDP-N-acetylmuramoyl-L-alanine---D-glutamate ligase
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6.3.2.10 UDP-N-acetylmuramoyl-tripeptide---D-alanyl-D-alanine ligase
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6.3.2.11 carnosine synthase
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6.3.2.12 dihydrofolate synthase
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6.3.2.13 UDP-N-acetylmuramoyl-L-alanyl-D-glutamate---2,6-diaminopimelate ligase
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6.3.2.14 enterobactin synthase
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6.3.2.16 D-alanine---alanyl-poly(glycerolphosphate) ligase
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6.3.2.17 tetrahydrofolate synthase
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6.3.2.18 gamma-glutamylhistamine synthase
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6.3.2.20 indoleacetate---lysine synthetase
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6.3.2.23 homoglutathione synthase
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6.3.2.24 tyrosine---arginine ligase
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6.3.2.25 tubulin---tyrosine ligase
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6.3.2.26 N-(5-amino-5-carboxypentanoyl)-L-cysteinyl-D-valine synthase
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6.3.2.29 cyanophycin synthase (L-aspartate-adding)
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6.3.2.30 cyanophycin synthase (L-arginine-adding)
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6.3.2.31 coenzyme F420-0:L-glutamate ligase
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6.3.2.32 coenzyme gamma-F420-2:alpha-L-glutamate ligase
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6.3.2.33 tetrahydrosarcinapterin synthase
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6.3.2.34 coenzyme F420-1:gamma-L-glutamate ligase
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6.3.2.35 D-alanine---D-serine ligase
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6.3.2.36 4-phosphopantoate---beta-alanine ligase
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6.3.2.37 UDP-N-acetylmuramoyl-L-alanyl-D-glutamate---D-lysine ligase
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6.3.2.38 N2-citryl-N6-acetyl-N6-hydroxylysine synthase
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6.3.2.39 aerobactin synthase
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6.3.2.40 cyclopeptine synthase
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6.3.2.41 N-acetylaspartylglutamate synthase
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6.3.2.42 N-acetylaspartylglutamylglutamate synthase
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6.3.2.43 [amino-group carrier protein]---L-2-aminoadipate ligase
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6.3.2.44 pantoate---beta-alanine ligase (ADP-forming)
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6.3.2.45 UDP-N-acetylmuramate---L-alanyl-gamma-D-glutamyl-meso-2,6-diaminoheptanedioate ligase
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6.3.2.46 fumarate---(S)-2,3-diaminopropanoate ligase
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K22113 ddaG; fumarate---(S)-2,3-diaminopropanoate ligase [EC:6.3.2.46]
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6.3.2.47 dapdiamide synthase
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6.3.2.48 L-arginine-specific L-amino acid ligase
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6.3.2.49 L-alanine---L-anticapsin ligase
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6.3.2.50 tenuazonic acid synthetase
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6.3.2.51 phosphopantothenate---cysteine ligase (ATP)
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6.3.2.52 jasmonoyl---L-amino acid ligase
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6.3.2.53 UDP-N-acetylmuramoyl-L-alanine---L-glutamate ligase
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6.3.2.54 L-2,3-diaminopropanoate---citrate ligase
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6.3.2.55 2-[(L-alanin-3-ylcarbamoyl)methyl]-3-(2-aminoethylcarbamoyl)-2-hydroxypropanoate synthase
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6.3.2.56 staphyloferrin B synthase
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6.3.2.57 staphyloferrin A synthase
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6.3.2.58 D-ornithine---citrate ligase
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6.3.2.59 3-methyl-D-ornithine---L-lysine ligase
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6.3.2.60 glutamate---[amino group carrier protein] ligase
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6.3.2.61 tubulin-glutamate ligase
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6.3.2.62 beta-tubulin-glutamate ligase
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6.3.2.63 putrebactin synthase
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6.3.2.64 bisucaberin synthase
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6.3.3 Cyclo-ligases
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6.3.4 Other carbon-nitrogen ligases
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6.3.5 Carbon-nitrogen ligases with glutamine as amido-N-donor
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6.4 Forming carbon-carbon bonds
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6.5 Forming phosphoric-ester bonds
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6.6 Forming nitrogen-metal bonds
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6.7 Forming nitrogen-nitrogen bonds
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7. Translocases
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