Protein phosphatase that shows typical type 2C protein phosphatase (PP2C) activity (PubMed:17002782). Catalyzes the dephosphorylation and concomitant reactivation of the E1 alpha subunit (PDA1) of the pyruvate dehydrogenase complex (PubMed:18180296). Required for efficient mitophagy in stationary phase cells (PubMed:17166847). H2O + O-phospho-L-seryl-[pyruvate dehydrogenase E1 alpha subunit] = L-seryl-[pyruvate dehydrogenase E1 alpha subunit] + phosphate H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Interacts with PRO2. Confers rapamycin-sensitivity. Present with 432 molecules/cell in log phase SD medium.