Enables calcium ion binding activity; magnesium ion binding activity; and protein serine/threonine phosphatase activity. Predicted to be involved in peptidyl-threonine dephosphorylation and positive regulation of pyruvate dehydrogenase activity. Located in mitochondrion. Human ortholog(s) of this gene implicated in obesity and pyruvate decarboxylase deficiency. Orthologous to human PDP1 (pyruvate dehydrogenase phosphatase catalytic subunit 1). [provided by Alliance of Genome Resources, Apr 2022]