Predicted to enable phosphatidylglycerophosphatase activity and phosphatidylinositol-4,5-bisphosphate 5-phosphatase activity. Involved in negative regulation of insulin secretion involved in cellular response to glucose stimulus. Is integral component of mitochondrial inner membrane. Orthologous to human PTPMT1 (protein tyrosine phosphatase mitochondrial 1). [provided by Alliance of Genome Resources, Apr 2022]