Molecular and General Genetics MGG

, Volume 262, Issue 4–5, pp 898–908

α and β subunits of F1-ATPase are required for survival of petite mutants in Saccharomyces cerevisiae

  • X. J. Chen
  • G. D. Clark-Walker

DOI: 10.1007/s004380051156

Cite this article as:
Chen, X. & Clark-Walker, G. Mol Gen Genet (1999) 262: 898. doi:10.1007/s004380051156


Although Saccharomyces cerevisiae can form petite mutants with deletions in mitochondrial DNA (mtDNA) (ρ) and can survive complete loss of the organellar genome (ρo), the genetic factor(s) that permit(s) survival of ρ and ρo mutants remain(s) unknown. In this report we show that a function associated with the F1-ATPase, which is distinct from its role in energy transduction, is required for the petite-positive phenotype of S. cerevisiae. Inactivation of either the α or β subunit, but not the γ, δ, or ɛ subunit of F1, renders cells petite-negative. The F1 complex, or a subcomplex composed of the α and β subunits only, is essential for survival of ρo cells and those impaired in electron transport. The activity of F1 that suppresses ρo lethality is independent of the membrane Fo complex, but is associated with an intrinsic ATPase activity. A further demonstration of the ability of F1 subunits to suppress ρo lethality has been achieved by simultaneous expression of S. cerevisiae F1α and γ subunit genes in Kluyveromyces lactis– which allows this petite-negative yeast to survive the loss of its mtDNA. Consequently, ATP1 and ATP2, in addition to the previously identified AAC2, YME1 and PEL1/PGS1 genes, are required for establishment of ρ or ρo mutations in S. cerevisiae.

Key words F1-ATPase Mitochondrial DNA Petite mutation ρo lethality Yeast 

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • X. J. Chen
    • 1
  • G. D. Clark-Walker
    • 1
  1. 1.Molecular and Cellular Genetics Group Research School of Biological Sciences The Australian National University Biology Place, RSBS Building GPO Box 475, ACT 2601, Australia e-mail: Tel.: +61-2-62494510, Fax: +61-2-62798294AU

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