Mitochondrial intermediate peptidase (EC 3.4.24.59, mitochondrial intermediate precursor-processing proteinase, MIP) is an enzyme. This enzyme catalyses the following chemical reaction Mitochondrial intermediate peptidase (EC 3.4.24.59, mitochondrial intermediate precursor-processing proteinase, MIP) is an enzyme. This enzyme catalyses the following chemical reaction This enzyme is a homologue of thimet oligopeptidase.