Rogowska AT, Puchta O, Czarnecka AM, Kaniak A, Stepien PP, Golik P

Mol Biol Cell. 2006 Mar;17(3):1184–93

The Saccharomyces cerevisiae SUV3 gene encodes the helicase component of the mitochondrial degradosome (mtEXO), the principal 3′-to-5′ exoribonuclease of yeast mitochondria responsible for RNA turnover and surveillance. Inactivation of SUV3 (suv3Delta) causes multiple defects related to overaccumulation of aberrant transcripts and precursors, leading to a disruption of mitochondrial gene expression and loss of respiratory function. We isolated spontaneous suppressors that partially restore mitochondrial function in suv3Delta strains devoid of mitochondrial introns and found that they correspond to partial loss-of-function mutations in genes encoding the two subunits of the mitochondrial RNA polymerase (Rpo41p and Mtf1p) that severely reduce the transcription rate in mitochondria. These results show that reducing the transcription rate rescues defects inRNA turnover and demonstrates directly the vital importance of maintaining the balance between RNA synthesis and degradation.