IUBMB Enzyme Nomenclature


Accepted name: carbamate kinase

Reaction: ATP + NH3 + hydrogencarbonate = ADP + carbamoyl phosphate + H2O (overall reaction)
(1a) ATP + carbamate = ADP + carbamoyl phosphate
(1b) NH3 + hydrogencarbonate = carbamate + H2O (spontaneous)

For diagram of reaction click here

Other name(s): CKase; carbamoyl phosphokinase; carbamyl phosphokinase

Systematic name: ATP:carbamate phosphotransferase

Comments: The enzyme catalyses the reversible conversion of carbamoyl phosphate and ADP to ATP and carbamate, which hydrolyses to ammonia and hydrogencarbonate. The physiological role of the enzyme is to generate ATP.

Links to other databases: BRENDA, EXPASY, ExplorEnz, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9026-69-1


1. Jones, M.E., Spector, L. and Lipmann, F. Carbamyl phosphate, the carbamyl donor in enzymatic citrulline synthesis. J. Am. Chem. Soc. 77 (1955) 819-820.

2. Davis, R.H. Carbamyl phosphate synthesis in Neurospora crassa. I. Preliminary characterization of arginine-specific carbamyl phosphokinase. Biochim. Biophys. Acta 107 (1965) 44-53. [PMID: 5857367]

3. Glasziou, K.T. The metabolism of arginine in Serratia marcescens. II. Carbamyladenosine diphosphate phosphoferase. Aust. J. Biol. Sci. 9 (1956) 253-262.

4. Bishop, S.H. and Grisolia, S. Crystalline carbamate kinase. Biochim. Biophys. Acta 118 (1966) 211-215. [PMID: 4959296]

5. Srivenugopal, K.S. and Adiga, P.R. Enzymic conversion of agmatine to putrescine in Lathyrus sativus seedlings. Purification and properties of a multifunctional enzyme (putrescine synthase). J. Biol. Chem. 256 (1981) 9532-9541. [PMID: 6895223]

[EC created 1961, modified 2018]

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