_EC 6.3.4.- Other carbon--nitrogen ligases. 495 PDB entries  
EC 6.-.-.- Ligases. [3,414 PDB entries]
EC 6.3.-.- Forming carbon-nitrogen bonds. [1,455 PDB entries]
EC 6.3.4.- Other carbon--nitrogen ligases. [495 PDB entries]
EC 6.3.4.1 Transferred entry: 6.3.5.2. [-]
EC 6.3.4.2 Ctp synthase (glutamine hydrolyzing). [50 PDB entries]
EC 6.3.4.3 formate--tetrahydrofolate ligase. [28 PDB entries]
EC 6.3.4.4 adenylosuccinate synthase. [53 PDB entries]
EC 6.3.4.5 argininosuccinate synthase. [20 PDB entries]
EC 6.3.4.6 urea carboxylase. [4 PDB entries]
EC 6.3.4.7 ribose-5-phosphate--ammonia ligase. [-]
EC 6.3.4.8 imidazoleacetate--phosphoribosyldiphosphate ligase. [-]
EC 6.3.4.9 biotin--[methylmalonyl-CoA-carboxytransferase] ligase. [-]
EC 6.3.4.10 biotin--[propionyl-CoA-carboxylase (ATP-hydrolyzing)] ligase. [-]
EC 6.3.4.11 biotin--[methylcrotonoyl-CoA-carboxylase] ligase. [-]
EC 6.3.4.12 glutamate--methylamine ligase. [-]
EC 6.3.4.13 phosphoribosylamine--glycine ligase. [55 PDB entries]
EC 6.3.4.14 biotin carboxylase. [91 PDB entries]
EC 6.3.4.15 biotin--[biotin carboxyl-carrier protein] ligase. [56 PDB entries]
EC 6.3.4.16 carbamoyl-phosphate synthase (ammonia). [75 PDB entries]
EC 6.3.4.17 formate--dihydrofolate ligase. [-]
EC 6.3.4.18 5-(carboxyamino)imidazole ribonucleotide synthase. [17 PDB entries]
EC 6.3.4.19 tRNA(Ile)-lysidine synthetase. [6 PDB entries]
EC 6.3.4.20 7-cyano-7-deazaguanine synthase. [2 PDB entries]
EC 6.3.4.21 nicotinate phosphoribosyltransferase. [14 PDB entries]
EC 6.3.4.22 tRNA(Ile)(2)-agmatinylcytidine synthase. [7 PDB entries]
EC 6.3.4.23 formate--phosphoribosylaminoimidazolecarboxamide ligase. [8 PDB entries]
EC 6.3.4.24 tyramine--L-glutamate ligase. [-]
EC 6.3.4.25 2-amino-2'-deoxyadenylo-succinate synthase. [9 PDB entries]

[-] signifies that there are no PDB entries for the given enzyme subclass