Component of the mitochondrial ribosome (mitoribosome), a dedicated translation machinery responsible for the synthesis of mitochondrial genome-encoded proteins, including at least some of the essential transmembrane subunits of the mitochondrial respiratory chain (PubMed:16451194). Also has extraribosomal functions, being involved in regulation of mitochondrial DNA recombination, maintenance and repair, and generation of homoplasmic cells (By similarity). Acts as transcription factor involved in regulation of RNA polymerase II-dependent transcription (By similarity). Component of the mitochondrial large ribosomal subunit (mt-LSU). Belongs to the mitochondrion-specific ribosomal protein mL67 family.