IUBMB Enzyme Nomenclature


Accepted name: protein-fructosamine 3-kinase

Reaction: ATP + [protein]-N6-D-fructosyl-L-lysine = ADP + [protein]-N6-(3-O-phospho-D-fructosyl)-L-lysine

Other name(s): FN3K; fructosamine 3-kinase

Systematic name: ATP:[protein]-N6-D-fructosyl-L-lysine 3-phosphotransferase

Comments: Nonenzymatic glycation is an important factor in the pathogenesis of diabetic complications. Key early intermediates in this process are fructosamines, such as [protein]-N6-D-fructosyl-L-lysine. Fructosamine-3-kinase is part of an ATP-dependent system for removing carbohydrates from nonenzymatically glycated proteins. The phosphorylation destablilizes the [protein]-N6-D-fructosyl-L-lysine adduct and leads to its spontaneous decomposition. cf. EC, protein-ribulosamine 3-kinase.

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


1. Szwergold, B.S., Howell, S. and Beisswenger, P.J. Human fructosamine-3-kinase: purification, sequencing, substrate specificity, and evidence of activity in vivo. Diabetes 50 (2001) 2139-2147. [PMID: 11522682]

2. Delpierre, G., Rider, M.H., Collard, F., Stroobant, V., Vanstapel, F., Santos, H. and Van Schaftingen, E. Identification, cloning, and heterologous expression of a mammalian fructosamine-3-kinase. Diabetes 49 (2000) 1627-1634. [PMID: 11016445]

[EC created 2011]

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