HOLUBÁŘOVÁ, Alena, Petr MÜLLER and Augustin SVOBODA. A response of yeast cells to heat stress: cell viability and the stabilitz of cytoskeletal structures. Scripta medica. Brno: MU, 2000, vol. 73, No 6, p. 381-391. ISSN 1211-3395.
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Basic information
Original name A response of yeast cells to heat stress: cell viability and the stabilitz of cytoskeletal structures
Authors HOLUBÁŘOVÁ, Alena, Petr MÜLLER and Augustin SVOBODA.
Edition Scripta medica, Brno, MU, 2000, 1211-3395.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10600 1.6 Biological sciences
Country of publisher Czech Republic
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14110/00:00005108
Organization unit Faculty of Medicine
Keywords in English Saccharomyces cerevisiae; heat shock; Hsp104; actin; microtubules
Tags Actin, heat shock, Hsp104, Microtubules, Saccharomyces cerevisiae
Changed by Changed by: Mgr. Alena Holubářová, Ph.D., učo 8315. Changed: 19/12/2001 15:38.
Abstract
The cells of Saccharomyces cerevisiae were exposed to the effect of mild and lethal heat stress and their viability and changes in their microtubular and actin structures were studied. An increase in cultivation temperature from 25 C to 46 C (lethal heat shock, LHS) resulted, during 10 min, in a rapid decrease in cell viability. However, a mild increase in incubation temperature from 25 C to 37 C or 41 C (mild heat shock, MHS) induced cell tolerance to LHS and the cells were able to survive at 46 C for up to 30 min. A mild heat shock increased the level of Hsp104 in cells, as demonstrated by western blot analysis and indirect immunofluorescence microscopy. In cell exposed to LHS, immunofluorescence microscopy showed rapid degradation of both cytoplasmic and nuclear microtubules, but the spindle pole bodies (SPB) remained preserved. On the other hand, MHS did not produce microtubule degradation. Microtubules remained stable after the LHS that had been preceded by cell cultivation at 37 C. It is suggested that stress proteins induced by MHS were involved in maintaining microtubule stability. The actin cytoskeleton was very sensitive to heat shock and transfer of cells to both 37 C and 41 C resulted in disintegration of actin filaments and the spreading of actin dots from the bud to the whole cell surface. No stabilisation effect of stress proteins on actin structures was observed. Resistance to LHS was also induced by an osmotic shock in the presence of 1M KCl in culture medium. However, the production of stress proteins in response to osmotic shock was generally slower than to MHS because the cells became resistant to LHS only after being exposed to 1M KCl for 3 h.
Links
GA204/00/0394, research and development projectName: Buněčná stěna kvasinek jako extracelulární matrix: cytoskelet a stěnové funkce
Investor: Czech Science Foundation, The yeast cell wall as an extracellular matrix: cytoskeleton and cell wall functions
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