IUBMB Enzyme Nomenclature


Accepted name: N-acetylgalactosamine kinase

Reaction: ATP + N-acetyl-α-D-galactosamine = ADP + N-acetyl-α-D-galactosamine 1-phosphate

Other name(s): GALK2; GK2; GalNAc kinase; N-acetylgalactosamine (GalNAc)-1-phosphate kinase

Systematic name: ATP:N-acetyl-D-galactosamine 1-phosphotransferase

Comments: The enzyme is highly specific for GalNAc as substrate, but has slight activity with D-galactose [2]. Requires Mg2+, Mn2+ or Co2+ for activity, with Mg2+ resulting in by far the greatest stimulation of enzyme activity.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Pastuszak, I., Drake, R. and Elbein, A.D. Kidney N-acetylgalactosamine (GalNAc)-1-phosphate kinase, a new pathway of GalNAc activation. J. Biol. Chem. 271 (1999) 20776-20782. [PMID: 8702831]

2. Pastuszak, I., O'Donnell, J. and Elbein, A.D. Identification of the GalNAc kinase amino acid sequence. J. Biol. Chem. 271 (1996) 23653-23656. [PMID: 8798585]

3. Thoden, J.B. and Holden, H.M. The molecular architecture of human N-acetylgalactosamine kinase. J. Biol. Chem. (2005) 32784-32791 [PMID: 16006554]

[EC created 2005]

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