Involved in organellar RNA editing. Required for the processing of numerous RNA editing sites in mitochondria (PubMed:22411807, PubMed:23818871). Binds to the mitochondrial MEF19 and MEF21 factors, two pentatricopeptide repeat-containing proteins involved in RNA editing (PubMed:22411807). Homodimer and heterodimer with MORF3 (PubMed:22411807, PubMed:25583991). Heterodimers with MORF8/RIP1, MORF4/RIP4 and MORF6/RIP6 (PubMed:25583991). Interacts with PCMP-E90/MEF13 (PubMed:26048647). Interacts with PCMP-H13/MEF35 (PubMed:26470017). Embryonic lethality when homozygous. Belongs to the MORF family. Sequencing errors.