_EC 5.2.1.- Cis-trans Isomerases. 424 PDB entries  
EC 5.-.-.- Isomerases. [2,112 PDB entries]
EC 5.2.-.- Cis-trans-isomerases. [424 PDB entries]
EC 5.2.1.- Cis-trans Isomerases. [424 PDB entries]    
EC 5.2.1.1 Maleate isomerase. [4 PDB entries]
EC 5.2.1.2 Maleylacetoacetate isomerase. [6 PDB entries]
EC 5.2.1.3 Deleted entry. [-]
EC 5.2.1.4 Maleylpyruvate isomerase. [2 PDB entries]
EC 5.2.1.5 Linoleate isomerase. [-]
EC 5.2.1.6 Furylfuramide isomerase. [-]
EC 5.2.1.7 Transferred entry: 3.1.1.64. [-]
EC 5.2.1.8 Peptidylprolyl isomerase. [412 PDB entries]
EC 5.2.1.9 Farnesol 2-isomerase. [-]
EC 5.2.1.10 2-chloro-4-carboxymethylenebut-2-en-1,4-olide isomerase. [-]
EC 5.2.1.11 Deleted entry. [-]
EC 5.2.1.12 Zeta-carotene isomerase. [-]
EC 5.2.1.13 Prolycopene isomerase. [-]
EC 5.2.1.14 Beta-carotene isomerase. [-]

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