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. 1984 Apr;158(1):94–101. doi: 10.1128/jb.158.1.94-101.1984

Physiology of a temperature-sensitive mutant of Saccharomyces cerevisiae defective in phosphofructokinase activity.

S Banerjee, G S Getz, M Garg
PMCID: PMC215384  PMID: 6232262

Abstract

In this paper, we describe a temperature-sensitive mutant of the yeast Saccharomyces cerevisiae (P5-9) which at a restrictive temperature (36 degrees C) shows a pleiotropic defect for transport of many different metabolites. The temperature sensitivity of the mutant is closely related to a reduction in phosphofructokinase activity. This conclusion is based on the following criteria. (i) Both the primary isolate, designated P5-9 (ts [rho-] Ino-), which is an inositol auxotroph and respiration deficient, and a purified derivative, SB4 (ts [rho+] Ino+ ), which is respiration competent and capable of growing in the absence of inositol, are temperature sensitive for growth and ethanol production in media containing glucose or fructose as the sole carbon source. (ii) The respiration-competent derivative SB4 is not temperature sensitive in media containing glycerol or glycerol-pyruvate; glucose inhibits its growth at 36 degrees C in these media. (iii) Assays of glycolytic enzymes in P5-9 and SB4 extracts, prepared from cells incubated for 1 to 2 h at 36 degrees C before harvesting, show selective reduction in phosphofructokinase activity. Analysis of tetrads derived from the cross of mutant and nonmutant haploids indicates that temperature sensitivity for growth is due to a single gene or to two closely linked genes. The biochemical analysis of spores from seven such tetrads revealed a uniform cosegregation of temperature sensitivity for growth and phosphofructokinase activity. Transport and ATP levels were drastically reduced in SB4 cells incubated at 36 degrees C for 1 to 2 h with glucose as the carbon source, but not when glycerol-pyruvate or lactate was the energy source. Therefore, depletion of energy as a result of phosphofructokinase inactivation appears to be the cause of the pleiotropic transport defect observed in the mutant.

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Selected References

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