In enzymology, an amidase (EC 3.5.1.4, acylamidase, acylase (misleading), amidohydrolase (ambiguous), deaminase (ambiguous), fatty acylamidase, N-acetylaminohydrolase (ambiguous)) is an enzyme that catalyzes the hydrolysis of an amide: Thus, the two substrates of this enzyme are an amide and H2O, whereas its two products are and NH3. Examples of AS signature-containing enzymes include: