Journal
MICROBIOLOGY
Volume 83, Issue 5, Pages 498-504Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0026261714050282
Keywords
Rhizomucor miehei; heat shock; heat resistance; membrane lipids; phosphatidic acids; trehalose
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Funding
- Russian Foundation for Basic Research [12-04-00732]
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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 (41-43A degrees C), high trehalose content (8-11%) was found at all stages of growth of submerged culture. Heat shock (51-53A degrees 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.
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