Heat shock response in the thermophilic fungus Rhizomucor miehei

Changes in the composition of the membrane lipids and cytosol carbohydrates of the thermophilic fungus Rhizomucor miehei in response to heat shock were studied. Under optimal conditions (41–43°C), high trehalose content (8–11%) was found at all stages of growth of submerged culture. Heat shock (51–5...

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Bibliographic Details
Published in:Microbiology (New York) 2014-09, Vol.83 (5), p.498-504
Main Authors: Yanutsevich, E. A., Memorskaya, A. S., Groza, N. V., Kochkina, G. A., Tereshina, V. M.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Experimental Articles
Life Sciences
Medical Microbiology
Microbiology
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Summary:Changes in the composition of the membrane lipids and cytosol carbohydrates of the thermophilic fungus Rhizomucor miehei in response to heat shock were studied. Under optimal conditions (41–43°C), high trehalose content (8–11%) was found at all stages of growth of submerged culture. Heat shock (51–53°C) for 1 h did not result in enhanced trehalose synthesis, while increase in shock duration to 3 h resulted in a significant increase in trehalose content. The share of sterols and phosphatidic acids in the membrane lipids increased, while the share of phosphatidylcholines and phosphatidylethanolamines decreased. These processes resulted in increased content of non-bilayer lipids, while the unsaturation degree of the fatty acids of the major phospholipids did not decrease. Comparison of resistance to lethal heat shock in the control and experimental variants of R. miehei revealed that this thermophilic fungus exhibited no acquired heat resistance.
ISSN:0026-2617
1608-3237
DOI:10.1134/S0026261714050282