Enables protein serine/threonine phosphatase activity. Predicted to be involved in several processes, including negative regulation of protein kinase activity; peptidyl-threonine dephosphorylation; and positive regulation of stress fiber assembly. Located in mitochondrion and nucleus. Orthologous to human PPM1E (protein phosphatase, Mg2+/Mn2+ dependent 1E). [provided by Alliance of Genome Resources, Apr 2022]