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Regulation of fitness in yeast overexpressing glycolytic enzymes: responses to heat shock and nitrogen starvation

Published online by Cambridge University Press:  14 April 2009

R. F. Rosenzweig
R. F. Rosenzweig
Affiliation:
Department of Biology, Leidy Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Current models based on the analysis of linear metabolic pathways at steady-state predict that large increases over wild type in the activity of one enzyme will not alter an organism's fitness. This prediction is tested at steps in a highly branched pathway under two conditions known to alter steady-state: heat shock and nitrogen starvation. Saccharomyces cerevisiae transformants overproducing 1 of 4 enzymes in glycolysis (hexokinase B, phosphoglucose isomerase, phosphofructokinase, or pyruvate kinase) were subjected to heat shock in both exponential and stationary phases of growth. In neither phase does enzyme overexpression alter heat shock sensitivity. When starved for nitrogen in acetate medium, transformants overproducing hexokinase, phosphoglucose isomerase, and phosphofructokinase sporulate at the same rate and with the same frequency as cells harbouring only the plasmid vector. Current models therefore correctly predict the relationship between activity and components of fitness for 3 of 4 enzymes. By contrast, cells overexpressing pyruvate kinase sporulate poorly. This defect is not observed among cells transformed with a plasmid containing a Tn5 disrupted copy of the PYK gene. These findings are consistent with reports that implicate the PYK locus in yeast cell cycle control and suggest that it may be challenging to model relations between fitness and activity for multifunctional proteins.

Type
Research Article
Information
Genetics Research , Volume 59 , Issue 3 , June 1992 , pp. 167 - 177
Copyright
Copyright © Cambridge University Press 1992

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