ligase * : carnitine—CoA ligase * : long-chain fatty acid adenylyltransferase FadD28 * : 4-hydroxybenzoate adenylyltransferase FadD22 * : 4-hydroxyphenylalkanoate adenylyltransferase FadD29 * : L-firefly luciferin—CoA ligase * : L-proline—[L-prolyl-carrier protein] ligase * : D-alanine—[D-alanyl-carrier protein] ligase * : E1 SAMP-activating enzyme * : 4-hydroxybutyrate—CoA ligase (ADP-forming) * : long-chain fatty acid adenylase/transferase FadD23 * : isophthalate—CoA ligase * : long-chain fatty acid adenylase/transferase FadD26 * : marinolic acid—CoA ligase * : salicylate—[aryl-carrier protein] ligase * : 3,4-dihydroxybenzoate—[aryl-carrier protein] ligase * : L-arginine—[L-arginyl-carrier protein] ligase * : E1 NEDD8-activating enzyme * : salicylate—CoA ligase * : glyine—[glycyl-carrier protein] ligase * : L-alanine—[L-alanyl-carrier protein] ligase * : L-glutamate—[L-glutamyl-carrier protein] ligase * : L-cysteine—[L-cysteinyl-carrier protein] ligase * : L-threonine—[L-threonyl-carrier protein] ligase * : 2,3-dihydroxybenzoate—[aryl-carrier protein] ligase * : L-serine—[L-seryl-carrier protein] ligase * : L-tryptophan—[L-tryptophyl-carrier protein] ligase * : 3-amino-5-hydroxybenzoate—[acyl-carrier protein] ligase * + : indoleacetate—CoA ligase * No Wikipedia article EC 6.2.2: Amide—thiol ligases : thioglycine synthase * : oxazoline synthase * : thiazoline synthase * * No Wikipedia article EC 6.3: Forming Carbon-Nitrogen Bonds EC 6.3.1: Acid—Ammonia (or Amine) Ligases (Amide Synthases) : aspartate—ammonia ligase : glutamine synthetase : Now , phosphoribosylamine—glycine ligase : aspartate—ammonia ligase (ADP-forming) : NAD+ synthase : glutamate—ethylamine ligase : 4-methyleneglutamate—ammonia ligase : glutathionylspermidine synthase : trypanothione synthase : adenosylcobinamide-phosphate synthase : glutamate—putrescine ligase : D-aspartate ligase : L-cysteine:1D-myo-inositol 2-amino-2-deoxy-α-D-glucopyranoside ligase : diphthine—ammonia ligase : 8-demethylnovobiocic acid synthase * EC 6.3.1.16: The enzyme was discovered at the public-review stage to have been misclassified and so was withdrawn. See , carbapenam-3-carboxylate synthase : β-citrylglutamate synthase * : γ-glutamylanilide synthase * : prokaryotic ubiquitin-like protein ligase * : lipoate—protein ligase * : phosphoribosylglycinamide formyltransferase 2 * * No Wikipedia article EC 6.3.2: Acid—Amino-Acid Ligases (Peptide Synthases) : pantoate—β-alanine ligase (AMP-forming) : glutamate—cysteine ligase : glutathione synthase : D-alanine—D-alanine ligase : phosphopantothenate—cysteine ligase (CTP) : phosphoribosylaminoimidazolesuccinocarboxamide synthase : UDP-N-acetylmuramoyl-L-alanyl-D-glutamate—L-lysine ligase : UDP-N-acetylmuramate—L-alanine ligase : UDP-N-acetylmuramoyl-L-alanine—D-glutamate ligase : UDP-N-acetylmuramoyl-tripeptide—D-alanyl-D-alanine ligase : carnosine synthase : dihydrofolate synthase : UDP-N-acetylmuramoyl-L-alanyl-D-glutamate—2,6-diaminopimelate ligase : enterobactin synthase EC 6.3.2.15: Deleted, The activity observed is due to , UDP-N-acetylmuramoyl-tripeptideD-alanyl-D-alanine ligase : D-alanine—alanyl-poly(glycerolphosphate) ligase : tetrahydrofolate synthase : γ-glutamylhistamine synthase EC 6.3.2.19: The ubiquitinylation process is now known to be performed by several enzymes in sequence, starting with (ubiquitin-activating enzyme E1) and followed by several transfer reactions, including those of (E2 ubiquitin-conjugating enzyme) and (RING-type E3 ubiquitin transferase) : indoleacetate—lysine synthetase EC 6.3.2.21: The reaction is performed by