Phospho-Serine/Threonine 2025. Phosphorylation of proteins on serine and threonine residues has traditionally been viewed as a means to allosterically regulate catalytic activity. Approximately 400 of the 518 kinases in the human genome are serine/threonine specific protein kinases.

Approximately 400 of the 518 kinases in the human genome are serine/threonine specific protein kinases. Phosphorylation is catalyzed by protein kinases, with the majority of phosphorylation occurring.