Molecular and General Genetics MGG

, Volume 204, Issue 1, pp 103–107

A mutation affecting lipoamide dehydrogenase, pyruvate dehydrogenase and 2-oxoglutarate dehydrogenase activities in Saccharomyces cerevisiae

Authors

  • J. Richard Dickinson
    • Department of MicrobiologyUniversity College, Cardiff
  • Douglas J. Roy
    • Department of MicrobiologyUniversity of Edinburgh
  • Ian W. Dawes
    • Department of MicrobiologyUniversity of Edinburgh
Article

DOI: 10.1007/BF00330195

Cite this article as:
Richard Dickinson, J., Roy, D.J. & Dawes, I.W. Molec Gen Genet (1986) 204: 103. doi:10.1007/BF00330195

Summary

In Saccharomyces cerevisiae a nuclear recessive mutation, lpd1, which simultaneously abolishes the activities of lipoamide dehydrogenase, 2-oxoglutarate dehydrogenase and pyruvate dehydrogenase has been identified. Strains carrying this mutation can grow on glucose or poorly on ethanol, but are unable to grow on media with glycerol or acetate as carbon source. The mutation does not prevent the formation of other tricarboxylic acid cycle enzymes such as fumarase, NAD+-linked isocitrate dehydrogenase or succinate-cytochrome c oxidoreductase, but these are produced at about 50%–70% of the wild-type levels. The mutation probably affects the structural gene for lipoamide dehydrogenase since the amount of this enzyme in the cell is subject to a gene dosage effect; heterozygous lpd1 diploids produce half the amount of a homozygous wild-type strain. Moreover, a yeast sequence complementing this mutation when present in the cell on a multicopy plasmid leads to marked overproduction of lipoamide dehydrogenase. Homozygous lpd1 diploids were unable to sporulate indicating that some lipoamide dehydrogenase activity is essential for sporulation to occur on acetate.

Key words

YeastLipoamide dehydrogenase2-oxoglutarate dehydrogenasePyruvate dehydrogenase

Copyright information

© Springer-Verlag 1986