_EC 2.1.3.- Carboxyl- and carbamoyltransferases. 162 PDB entries  
EC 2.-.-.- Transferases. [17,949 PDB entries]
EC 2.1.-.- Transferring one-carbon groups. [1,711 PDB entries]
EC 2.1.3.- Carboxyl- and carbamoyltransferases. [162 PDB entries]    
EC 2.1.3.1 Methylmalonyl-CoA carboxytransferase. [11 PDB entries]
EC 2.1.3.2 Aspartate carbamoyltransferase. [93 PDB entries]
EC 2.1.3.3 Ornithine carbamoyltransferase. [35 PDB entries]
EC 2.1.3.4 Deleted entry. [-]
EC 2.1.3.5 Oxamate carbamoyltransferase. [-]
EC 2.1.3.6 Putrescine carbamoyltransferase. [5 PDB entries]
EC 2.1.3.7 3-hydroxymethylcephem carbamoyltransferase. [-]
EC 2.1.3.8 Lysine carbamoyltransferase. [-]
EC 2.1.3.9 N-acetylornithine carbamoyltransferase. [18 PDB entries]
EC 2.1.3.10 Malonyl-S-ACP:biotin-protein carboxyltransferase. [-]
EC 2.1.3.11 N-succinylornithine carbamoyltransferase. [-]
EC 2.1.3.12 Decarbamoylnovobiocin carbamoyltransferase. [-]
EC 2.1.3.13 Atp carbamoyltransferase. [-]
EC 2.1.3.14 Tobramycin carbamoyltransferase. [-]

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