Protein serine/threonine phosphatase

The enzyme protein serine/threonine phosphatase (EC 3.1.3.16; systematic name protein-serine/threonine-phosphate phosphohydrolase) is a form of phosphoprotein phosphatase that acts upon phosphorylated serine/threonine residues: [a protein]-serine/threonine phosphate + H2O = [a protein]-serine/threonine + phosphate Serine and threonine phosphates are stable under physiological conditions, so a phosphatase enzyme has to remove the phosphate to reverse the regulation signal. Ser/Thr-specific protein phosphatases are regulated partly by their location within the cell and by specific inhibitor proteins.

Source: Wikipedia — Protein serine/threonine phosphatase (CC BY-SA 4.0)