Intracellular pH has an important role in the maintenance of the normal functions of yeast cells. The ability of the cell to maintain this pH homeostasis also in response to environmental changes has gained more and more interest in both basic and applied research. In this study we describe a protocol which allows the rapid determination of the intracellular pH of Saccharomyces cerevisiae cells. The method is based on flow cytometry and employs the pH-dependent fluorescent probe carboxy SNARF-4F. The protocol attempts to minimize the perturbation of the system under study, thus leading to accurate information about the physiological state of the single cell. Moreover, statistical analysis performed on major factors that may influence the final determination supported the validity of the optimized protocol. The protocol was used to investigate the effect of external pH on S. cerevisiae cells incubated in buffer. The results obtained showed that stationary cells are better able than exponentially grown cells to maintain their intracellular pH homeostasis independently of external pH changes. Furthermore, analysis of the intracellular pH distribution within the cell populations highlighted the presence of subpopulations characterized by different intracellular pH values. Notably, a different behavior was observed for exponentially grown and stationary cells in terms of the appearance and development of these subpopulations as a response to a changing external pH. Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Valli, M., Sauer, M., Branduardi, P., Borth, N., Porro, D., Mattanovich, D. (2005). Intracellular pH distribution in Saccharomyces cerevisiae cell populations, analyzed by flow cytometry. APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 71, 1515-1521 [10.1128/AEM.71.3.1515-1521.2005].

Intracellular pH distribution in Saccharomyces cerevisiae cell populations, analyzed by flow cytometry

BRANDUARDI, PAOLA;PORRO, DANILO;
2005

Abstract

Intracellular pH has an important role in the maintenance of the normal functions of yeast cells. The ability of the cell to maintain this pH homeostasis also in response to environmental changes has gained more and more interest in both basic and applied research. In this study we describe a protocol which allows the rapid determination of the intracellular pH of Saccharomyces cerevisiae cells. The method is based on flow cytometry and employs the pH-dependent fluorescent probe carboxy SNARF-4F. The protocol attempts to minimize the perturbation of the system under study, thus leading to accurate information about the physiological state of the single cell. Moreover, statistical analysis performed on major factors that may influence the final determination supported the validity of the optimized protocol. The protocol was used to investigate the effect of external pH on S. cerevisiae cells incubated in buffer. The results obtained showed that stationary cells are better able than exponentially grown cells to maintain their intracellular pH homeostasis independently of external pH changes. Furthermore, analysis of the intracellular pH distribution within the cell populations highlighted the presence of subpopulations characterized by different intracellular pH values. Notably, a different behavior was observed for exponentially grown and stationary cells in terms of the appearance and development of these subpopulations as a response to a changing external pH. Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Articolo in rivista - Articolo scientifico
Saccharomyces cerevisiae, intracellular pH, flow cytometry
English
2005
71
1515
1521
none
Valli, M., Sauer, M., Branduardi, P., Borth, N., Porro, D., Mattanovich, D. (2005). Intracellular pH distribution in Saccharomyces cerevisiae cell populations, analyzed by flow cytometry. APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 71, 1515-1521 [10.1128/AEM.71.3.1515-1521.2005].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/13837
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