Promotes sorting of SMDT1/EMRE in mitochondria by ensuring its maturation . Interacts with the transit peptide region of SMDT1/EMRE precursor protein in the mitochondrial matrix, leading to protect it against protein degradation by YME1L1, thereby ensuring SMDT1/EMRE maturation by the mitochondrial processing peptidase (PMPCA and PMPCB) .
Mitochondrion matrix .
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