_EC 6.3.4.- Other carbon--nitrogen ligases. 240 PDB entries  
EC 6.-.-.- Ligases. [1,580 PDB entries]
EC 6.3.-.- Forming carbon-nitrogen bonds. [793 PDB entries]
EC 6.3.4.- Other carbon--nitrogen ligases. [240 PDB entries]    
EC Transferred entry: [-]
EC Ctp synthase (glutamine hydrolyzing). [12 PDB entries]
EC Formate--tetrahydrofolate ligase. [22 PDB entries]
EC Adenylosuccinate synthase. [44 PDB entries]
EC Argininosuccinate synthase. [14 PDB entries]
EC Urea carboxylase. [-]
EC Ribose-5-phosphate--ammonia ligase. [-]
EC Imidazoleacetate--phosphoribosyldiphosphate ligase. [-]
EC Biotin--[methylmalonyl-CoA-carboxytransferase] ligase. [-]
EC Biotin--[propionyl-CoA-carboxylase (ATP-hydrolyzing)] ligase. [-]
EC Biotin--[methylcrotonoyl-CoA-carboxylase] ligase. [-]
EC Glutamate--methylamine ligase. [-]
EC Phosphoribosylamine--glycine ligase. [30 PDB entries]
EC Biotin carboxylase. [63 PDB entries]
EC Biotin--[acetyl-CoA-carboxylase] ligase. [17 PDB entries]
EC Carbamoyl-phosphate synthase (ammonia). [1 PDB entries]
EC Formate--dihydrofolate ligase. [-]
EC 5-(carboxyamino)imidazole ribonucleotide synthase. [5 PDB entries]
EC tRNA(Ile)-lysidine synthetase. [6 PDB entries]
EC 7-cyano-7-deazaguanine synthase. [2 PDB entries]
EC Nicotinate phosphoribosyltransferase. [12 PDB entries]
EC tRNA(Ile)(2)-agmatinylcytidine synthase. [4 PDB entries]
EC Formate--phosphoribosylaminoimidazolecarboxamide ligase. [8 PDB entries]

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