_EC 1.17.4.- With a disulfide as acceptor. 319 PDB entries  
EC 1.-.-.- Oxidoreductases. [21,484 PDB entries]
EC 1.17.-.- Acting on Ch or CH2 groups. [557 PDB entries]
EC 1.17.4.- With a disulfide as acceptor. [319 PDB entries]
EC 1.17.4.1 ribonucleoside-diphosphate reductase. [294 PDB entries]
EC 1.17.4.2 ribonucleoside-triphosphate reductase (thioredoxin). [14 PDB entries]
EC 1.17.4.3 Transferred entry: 1.17.7.1. [-]
EC 1.17.4.4 vitamin-K-epoxide reductase (warfarin-sensitive). [11 PDB entries]
EC 1.17.4.5 vitamin-K-epoxide reductase (warfarin-insensitive). [-]

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