Hydrolyases
These enzymes (code EC 3) catalyze the hydrolytic cleavage of C-O, C-N, C-C and some other bonds, including phosphoric anhydride bonds. Their trivial names are formed by adding the suffix 'ase ' to the substrate which they hydrolyze. Examples include protease, nuclease, phosphatase. A number of hydrolases acting on ester, glycosyl, peptide, amide or other bonds are known to catalyze not only the hydrolytic removal of a particular group from their substrates, but also the transfer of this group to a suitable acceptor molecule. Yet, they are not grouped as transferases, because the transfer of a specific group to water as the acceptor molecule is considered to be their main physiological function.