title: Aep3p stabilizes the mitochondrial bicistronic mRNA encoding subunits 6 and 8 of the H+-translocating ATP synthase of Saccharomyces cerevisiae.
abstract: Subunits 6 and 8 of the mitochondrial ATPase in Saccharomyces cerevisiae are encoded by the mitochondrial genome and translated from bicistronic mRNAs containing both reading frames. The stability of the two major species of ATP8/6 mRNA, which differ in the length of the 5'-untranslated region, depends on the expression of several nuclear-encoded factors. In the present study, the product of the gene designated AEP3 (open reading frame YPL005W) is shown to be required for stabilization and/or processing of both ATP8/6 mRNA species. In an aep3-disruptant strain, the shorter ATP8/6 mRNA was undetectable, and the level of the longer mRNA was reduced to approximately 35% that of wild type. Localization of a hemagglutinin-tagged version of Aep3p showed that the protein is an extrinsic constituent of the mitochondrial inner membrane facing the matrix.
authors.affiliation: Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Ellis
authors.forename: Kevin G
authors.initials: KG
authors.lastname: Helfenbein
authors.forename: Alexander
authors.initials: A
authors.lastname: Tzagoloff
authors.forename: Carol L
authors.initials: CL
authors.lastname: Dieckmann
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D005800:Genes, Fungal; D025261:Mitochondrial Proton-Translocating ATPases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D020871:RNA Stability; D012331:RNA, Fungal / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000201:enzymology; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism
chemical_list: D012331:RNA, Fungal; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D025261:Mitochondrial Proton-Translocating ATPases