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Title of article :
Modification of Saccharomyces cerevisiae thermotolerance following rapid exposure to acid stress
Author/Authors :
Carmelo، نويسنده , , Vanda and Santos، نويسنده , , Ricardo Almeida Viégas، نويسنده , , Cristina A. and Sل-Correia، نويسنده , , Isabel، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1998
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Abstract :
Thermotolerance was induced in cells of Saccharomyces cerevisiae YPH499 pre-exposed, during 10 min and in the presence of glucose, to a mild acid-stress with HCl at pH 3.5. Thermotolerance was not induced in cells exposed to a severe acid stress by 50 mM acetic acid at pH 3.5, or HCl at pH 2.5 or pH 2.0. Yeast cells pre-incubated under glucose starvation were found to be more tolerant to a lethal heat stress than cells pre-incubated in glucose-supplemented media, despite the pH value of the media (range 2.0–6.5) and the type of acidulant used (HCl or acetic acid). Moreover, the high thermotolerance exhibited by cells pre-incubated at pH 6.5 for 10 min under glucose starvation was not significantly modified by the acidification of the pre-incubation medium. Results are discussed based on the effect that glucose and a mild or severe acid stress have on plasma membrane H+-ATPase activity and on cytosolic pH values, estimated in a previous work.
Keywords :
Saccharomyces cerevisiae , cross-protection , acid stress , Glucose starvation , Thermotolerance acquisition
Journal title :
International Journal of Food Microbiology
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