Mitochondrial transcription factor that confers selective promoter recognition on the core subunit of the yeast mitochondrial RNA polymerase. Interacts with DNA in a non-specific manner. Present with 9380 molecules/cell in log phase SD medium. Although strongly related to dimethyladenosine transferase proteins, it lacks the methyltransferase activity. Dimethyladenosine transferase methylates the 2 adjacent adenosines in the loop of a conserved hairpin near the 3'-end of 12S mitochondrial rRNA in most species. This explains why 12S rRNA is not methylated in S.cerevisiae. Belongs to the class I-like SAM-binding methyltransferase superfamily. rRNA adenine N(6)-methyltransferase family.