_EC 3.6.-.- Acting on acid anhydrides. 2,183 PDB entries  
EC 3.-.-.- Hydrolases. [21,057 PDB entries]
EC 3.6.-.- Acting on acid anhydrides. [2,183 PDB entries]    
EC 3.6.1.- In phosphorous-containing anhydrides. [997 PDB entries]
EC 3.6.2.- In sulfonyl-containing anhydrides. [-]
EC 3.6.3.- Acting on acid anhydrides; catalyzing transmembrane movement of s [321 PDB entries]
EC 3.6.4.- Acting on acid anhydrides; involved in cellular and subcellular m [843 PDB entries]
EC 3.6.5.- Acting on GTP; involved in cellular and subcellular movement. [22 PDB entries]

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