@article{mbs:/content/journal/micro/10.1099/00221287-136-9-1763, author = "Panaretou, Barry and Piper, Peter W.", title = "Plasma-membrane ATPase action affects several stress tolerances of Saccharomyces cerevisiae and Schizosaccharomyces pombe as well as the extent and duration of the heat shock response", journal= "Microbiology", year = "1990", volume = "136", number = "9", pages = "1763-1770", doi = "https://doi.org/10.1099/00221287-136-9-1763", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-136-9-1763", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = "The pma1.1 mutations of Saccharomyces cerevisiae and Schizosaccharomyces pombe decrease plasma-membrane ATPase activity. This study investigated how they affect different stress tolerances, and the extent and duration of the heat-shock response. pma1.1 mutants exhibited higher resistance to ethanol and osmotic stress, but lower tolerance to ultraviolet damage, as compared to wild-type cells. pma1.1 mutations also increased tolerance of the lethal temperature of 48 °C in cells in which no heat-shock response had been induced. However, after induction of a heat-shock response and elevated thermotolerance by a 25–38 °C upshift, then maintaining cells at 38 °C for 40 min, pma1.1 lowered subsequent tolerances of much higher lethal temperatures. Analysis of pulse-labelled S. cerevisiae proteins revealed reduced heat-shock protein synthesis in the pma1.1 mutant after a 25–38 °C heat shock. This may explain the greater increases in thermotolerance in wild-type as compared to pma1.1 cells after both were given identical 25–38 °C shocks. With more severe treatment (25–42 °C), heat-shock protein synthesis in wild-type cells, although initially high, was switched off more rapidly than in the pma1.1 mutant. These results indicate that plasma-membrane ATPase action exerts a major influence over several stress tolerances, as well as the extent and duration of heat-shock protein synthesis following induction of the heat-shock response.", }