_EC 5.2.1.- Cis-trans isomerases. 964 PDB entries  
EC 5.-.-.- Isomerases. [5,284 PDB entries]
EC 5.2.-.- Cis-trans-isomerases. [964 PDB entries]
EC 5.2.1.- Cis-trans isomerases. [964 PDB entries]
EC 5.2.1.1 maleate isomerase. [4 PDB entries]
EC 5.2.1.2 maleylacetoacetate isomerase. [9 PDB entries]
EC 5.2.1.3 Deleted entry. [-]
EC 5.2.1.4 maleylpyruvate isomerase. [4 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. [947 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