Aep3p Stabilizes the Mitochondrial Bicistronic mRNA Encoding Subunits 6 and 8 of the H+-translocating ATP Synthase of Saccharomyces cerevisiae

Timothy P. Ellis, Kevin G. Helfenbein, Alexander Tzagoloff, Carol L. Dieckmann

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


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 ∼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.

Original languageEnglish (US)
Pages (from-to)15728-15733
Number of pages6
JournalJournal of Biological Chemistry
Issue number16
StatePublished - Apr 16 2004

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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