Fructosamine-3-kinase-related protein (FN3KRP)

Fructosamine-3-kinase-related protein (FN3KRP) is an enzyme found in humans and encoded by the FN3KRP gene (HGNC:25700). It belongs to the protein kinase family, sharing strong sequence similarity with fructosamine-3-kinase (FN3K), but it differs in substrate specificity. FN3KRP catalyzes the phosphorylation of ketosamines such as psicosamines and ribulosamines generated by non-enzymatic glycation (fructation) of proteins, rather than the Amadori products phosphorylated by FN3K. Its physiological role is believed to be the breakdown or removal of non-enzymatic fructation products from proteins, contributing to protein quality control and cellular metabolism. This function has implications for the regulation of the biological Maillard reaction and protein repair, but the exact metabolic substrates and disease relevance remain incompletely established[1][2][6]. FN3KRP is highly conserved across vertebrates and is constitutively expressed, underscoring its suspected importance in cellular homeostasis[1][5][6].

Other names

Ketosamine-3-kinaseFN3K-RPFN3K-related proteinFLJ12171FN3KLFructosamine-3-kinase-related proteinProtein-psicosamine 3-kinaseProtein-ribulosamine 3-kinaseTestis secretory sperm-binding protein Li 211a

If therapeutically targeted, inhibition or activation would likely affect cellular deglycation processes by modifying phosphorylation of non-enzymatic glycation products on proteins (ribuloselysine, psicoselysine)[1][2][6].