_EC 5.6.-.- Isomerases altering macromolecular conformation. 1,148 PDB entries  
EC 5.-.-.- Isomerases. [5,284 PDB entries]
EC 5.6.-.- Isomerases altering macromolecular conformation. [1,148 PDB entries]
EC 5.6.1.- Enzymes altering polypeptide conformation or assembly. [277 PDB entries]
EC 5.6.2.- Enzymes altering nucleic acid conformation. [871 PDB entries]