Ketosamine-3-kinase (FN3KRP)

Phosphorylates psicosamines and ribulosamines, but not fructosamines, on the third carbon of the sugar moiety. Protein- bound psicosamine 3-phosphates and ribulosamine 3-phosphates are unstable and decompose under physiological conditions.

Thus phosphorylation contributes to deglycation. .