PPP3R2 is a calcium-dependent， calmodulin stimulated serine/threonine protein phosphatase. In eukaryotes， the phosphorylation and dephosphorylation of proteins on serine and threonine residues is a crucial means of regulating a wide range of cellular functions including division， homeostasis and apoptosis. Ordinarily the protein phosphatase（PP) holoenzyme is a trimeric complex composed of a regulatory subunit， a variable subunit and a catalytic subunit.
