Fructosamine-3-kinase (FN3K)

Fructosamine-3-kinase (FN3K) is a conserved, atypical protein kinase that phosphorylates fructosamines on lysine residues, promoting deglycation and repair of proteins damaged by nonenzymatic sugar attachment[1][2][3][4]. This enzyme is encoded by the FN3K gene in humans and shares features with other protein kinases while being structurally and functionally unique[3][4]. FN3K-mediated deglycation protects cells against harmful glycation, thereby mitigating sugar-induced damage relevant to diabetes, but its activity can have context-specific effects in cancer and metabolic disease[5]. FN3K is increasingly studied as a therapeutic target, with its inhibitors under preclinical assessment for diabetes and its structural features being actively elucidated for drug design[3][4][5].

Other names

FN3KProtein-ribulosamine 3-kinaseProtein-psicosamine 3-kinaseFructosamine 3 kinase

Inhibition of FN3K decreases the formation of downstream toxic sugar metabolites (e.g., 3-deoxyglucosone). Targeting FN3K affects protein deglycation and may alter cell metabolism, glycation status, or redox regulation.