_EC 5.6.2.- Enzymes altering nucleic acid conformation. 871 PDB entries  
EC 5.-.-.- Isomerases. [5,284 PDB entries]
EC 5.6.-.- Isomerases altering macromolecular conformation. [1,148 PDB entries]
EC 5.6.2.- Enzymes altering nucleic acid conformation. [871 PDB entries]
EC 5.6.2.1 Dna topoisomerase. [89 PDB entries]
EC 5.6.2.2 Dna topoisomerase (ATP-hydrolyzing). [336 PDB entries]
EC 5.6.2.3 Dna 5'-3' helicase. [145 PDB entries]
EC 5.6.2.4 Dna 3'-5' helicase. [301 PDB entries]
EC 5.6.2.5 Rna 5'-3' helicase. [-]
EC 5.6.2.6 Rna 3'-5' helicase. [-]
EC 5.6.2.7 DEAD-box Rna helicase. [-]

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