Ammonia kinase

In enzymology, an ammonia kinase (EC 2.7.3.8) is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are ATP and NH₃, whereas its two products are ADP and phosphoramide.

This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with a nitrogenous group as acceptor. The systematic name of this enzyme class is ATP:ammonia phosphotransferase. Other names in common use include phosphoramidate-adenosine diphosphate phosphotransferase, and phosphoramidate-ADP-phosphotransferase.