Enables metalloendopeptidase activity. Contributes to metallopeptidase activity. Involved in protein processing involved in protein targeting to mitochondrion. Located in mitochondrion. Part of mitochondrial processing peptidase complex. Human ortholog(s) of this gene implicated in multiple mitochondrial dysfunctions syndrome 6. Orthologous to human PMPCB (peptidase, mitochondrial processing subunit beta). [provided by Alliance of Genome Resources, Apr 2022]