has part regulates phosphoprotein phosphatase activity phosphatase regulator activity protein phosphatase regulator activity protein phosphatase 3, intrinsic regulator activity GO:0008599 protein phosphatase 3 regulator activity GO:0030359 protein phosphatase type 2B, intrinsic regulator activity protein phosphatase type 4, intrinsic regulator activity Binds to and modulates the activity of a protein phosphatase. protein phosphatase 2, intrinsic regulator activity protein phosphatase type 1, intrinsic regulator activity protein phosphatase 2 regulator activity calcineurin, intrinsic regulator activity calcineurin regulator activity GO:0008601 molecular_function protein phosphatase type 1 regulator activity Reactome:R-HSA-180038 GO:0030362 GO:0019888 protein phosphatase type 2A regulator activity protein phosphatase type 2B regulator activity protein phosphatase type 2A, intrinsic regulator activity protein phosphatase type 4 regulator activity protein phosphatase binding