Nuclear inhibitor of protein phosphatase-1 (NIPP1) directs protein phosphatase-1 (PP1) to dephosphorylate the U2 small nuclear ribonucleoprotein particle (snRNP) component, spliceosome-associated protein 155 (Sap155).

Tanuma N, Kim SE, Beullens M, Tsubaki Y, Mitsuhashi S, Nomura M, Kawamura T, Isono K, Koseki H, Sato M, Bollen M, Kikuchi K, Shima H.J. Biol. Chem. 2008 Dec 19;283(51):35805-14. doi: 10.1074/jbc.M805468200