Protein phosphatase 1 regulatory subunits
protein phosphatase 1 regulatory subunits
PPP1R subunits (also known as PP1-interacting proteins, or PIPs) direct the substrate specificity of protein phosphatase 1 catalytic (PPP1C) subunits. The large number of PPP1Rs reflects the wide substrate range of the serine/threonine phosphatase holoenzymes.