_EC 3.4.4.- (not defined) 0 PDB entries  
EC 3.-.-.- Hydrolases. [21,057 PDB entries]
EC 3.4.-.- Acting on peptide bonds (peptide hydrolases). [6,846 PDB entries]
EC 3.4.4.- (not defined) [-]    
EC 3.4.4.1 Transferred entry: 3.4.23.1. [-]
EC 3.4.4.2 Transferred entry: 3.4.23.2. [-]
EC 3.4.4.3 Transferred entry: 3.4.23.4. [-]
EC 3.4.4.4 Transferred entry: 3.4.21.4. [-]
EC 3.4.4.5 Transferred entry: 3.4.21.1. [-]
EC 3.4.4.6 Transferred entry: 3.4.21.1. [-]
EC 3.4.4.7 Transferred entry: 3.4.21.36 and 3.4.21.37. [-]
EC 3.4.4.8 Transferred entry: 3.4.21.9. [-]
EC 3.4.4.9 Transferred entry: 3.4.14.1. [-]
EC 3.4.4.10 Transferred entry: 3.4.22.2. [-]
EC 3.4.4.11 Transferred entry: 3.4.22.6. [-]
EC 3.4.4.12 Transferred entry: 3.4.22.3. [-]
EC 3.4.4.13 Transferred entry: 3.4.21.5. [-]
EC 3.4.4.14 Transferred entry: 3.4.21.7. [-]
EC 3.4.4.15 Transferred entry: 3.4.23.15. [-]
EC 3.4.4.16 Transferred entry: 3.4.21.62, 3.4.21.63, 3.4.21.64, 3.4.21.65, 3.4.21.66 [-]
EC 3.4.4.17 Transferred entry: 3.4.21.103, 3.4.23.20, 3.4.23.21, 3.4.23.22, [-]
EC 3.4.4.18 Transferred entry: 3.4.22.10. [-]
EC 3.4.4.19 Transferred entry: 3.4.24.3. [-]
EC 3.4.4.20 Transferred entry: 3.4.22.8. [-]
EC 3.4.4.21 Transferred entry: 3.4.21.34. [-]
EC 3.4.4.22 Transferred entry: 3.4.23.3. [-]
EC 3.4.4.23 Transferred entry: 3.4.23.5. [-]
EC 3.4.4.24 Transferred entry: 3.4.22.32 and 3.4.22.33. [-]
EC 3.4.4.25 Deleted entry. [-]

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