part of mitochondrion mitochondrial matrix mitochondrial pyruvate dehydrogenase (lipoamide) phosphatase complex cellular_component GO:0019910 A mitochondrial complex of a regulatory and catalytic subunit that catalyzes the dephosphorylation and concomitant reactivation of the alpha subunit of the E1 component of the pyruvate dehydrogenase complex. An example of this component is found in Mus musculus. See also the cellular component term 'mitochondrial pyruvate dehydrogenase complex ; GO:0005967'. pyruvate dehydrogenase (lipoamide) phosphatase complex mitochondrial protein-containing complex