Enables protein serine/threonine phosphatase activity. Acts upstream of or within MAPK cascade and transmembrane receptor protein serine/threonine kinase signaling pathway. Predicted to be located in membrane. Predicted to be integral component of membrane. Is expressed in several structures, including ganglia; gut; limb segment; metanephros; and sensory organ. Orthologous to human PPM1L (protein phosphatase, Mg2+/Mn2+ dependent 1L). [provided by Alliance of Genome Resources, Apr 2022]