Summary
Mutants of Saccharomyces cerevisiae lacking pyruvate kinase (EC 2.7.1.40) are described. These have less than 0.5% of the pyruvate kinase activity of the wild type. All the other glycolytic enymes are present in normal amounts in these mutants. The mutation is recessive and segregates in diploids as a single gene. Five alleles examined fail to complement one another. Tetrad analysis and mitotic recombination data place the mutation on the left arm of chromosome I distal to cys 1. The majority of single-step spontaneous revertants on glucose regain the enzyme activity fully and this activity appears, by a number of criteria, to be due to the same enzyme present in the wild type. Some of these revertants become nuclear petites. The mutants do neither grow on nor ferment sugars but do grow on ethyl alcohol or pyruvate. Glucose addition to cultures growing on alcohol arrests growth until glucose is exhausted. The steady state rate of glucose utilization is slower than in the wild type. This is associated with the accumulation of as much as 5 μmoles P-enolpyruvate per g wet weight of cells and proportional amounts of 2-P-glyceric and 3-P glyceric acids.
The mutation is believed to involve some regulatory element in the synthesis of pyruvate kinase.
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Communicated by F. Kaudewitz
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Maitra, P.K., Lobo, Z. Pyruvate kinase mutants of Saccharomyces cerevisiae: Biochemical and genetic characterisation. Molec. Gen. Genet. 152, 193–200 (1977). https://doi.org/10.1007/BF00268817
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DOI: https://doi.org/10.1007/BF00268817