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DNA sequences in chromosomes 11 and VII code for pyruvate carboxylase isoenzymes in Saccharomyces cerevisiae: analysis of pyruvate carboxylase-deficient strains


A gene encoding pyruvate carboxylase has previously been isolated from Saccharomyces cerevisiae. We have isolated a second gene, PYC2, from the same organism also encoding a pyruvate carboxylase. The gene PYC2 is situated on the right arm of chromosome II between the DUR 1, 2 markers and the telomere. We localized the previously isolated gene, which we designate PYC1, to chromosome VII. Disruption of either of the genes did not produce marked changes in the phenotype. However, simultaneous disruption of both genes resulted in inability to grow on glucose as sole carbon source, unless aspartate was added to the medium. This indicates that in wild-type yeast there is no bypass for the reaction catalysed by pyruvate carboxylase. The coding regions of both genes exhibit a homology of 90% at the amino acid level and 85% at the nucleotide level. No appreciable homology was found in the corresponding flanking regions. No differences in the K m values for ATP or pyruvate were observed between the enzymes obtained from strains carrying inactive, disrupted versions of one or other of the genes.

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Author information

Correspondence to Carlos Gancedo.

Additional information

A preliminary report of this work was presented at the 15th International Conference on Yeast Genetics and Molecular Biology, The Hague, Netherlands. Abstract appeared in Yeast 6, S-240 (1990)

Communicated by C.P. Hollenberg

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Stucka, R., Dequin, S., Salmon, J. et al. DNA sequences in chromosomes 11 and VII code for pyruvate carboxylase isoenzymes in Saccharomyces cerevisiae: analysis of pyruvate carboxylase-deficient strains. Molec. Gen. Genet. 229, 307–315 (1991). https://doi.org/10.1007/BF00272171

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Key words

  • Pyruvate carboxylase
  • Chromosome II
  • Chromosome VII
  • Saccharomyces
  • PYC1, PYC2