N. V. Ozolina, V. V. Gurina, I. S. Kapustina, E. V. Spiridonova, V. N. Nurminsky
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Comparison of Changes in the Content of Plasma Membrane and Tonoplast Sterols under Oxidative and Osmotic Stress
We compared oxidative and osmotic stress-induced changes in sterol content in plasma membranes and tonoplasts isolated from stored beet (Betavulgaris L.) roots. The most significant differences between the membranes under all studied stresses were observed in the cholesterol content: it decreased in the plasmalemma, but increased 4-6 times in the tonoplast. Similar changes were observed for other sterols, but in different ways under different types of stress. Particularly noticeable differences were noted under hyperosmotic stress. The increase in the content of sterols was much more pronounced in the vacuolar membrane compared to the plasmalemma. This observation allows us to conclude that tonoplast plays a more significant role in protection of the plant cell from stress compared to plasmalemma.
期刊介绍：
Biochemistry (Moscow), Supplement Series A: Membrane and Cell Biology is an international peer reviewed journal that publishes original articles on physical, chemical, and molecular mechanisms that underlie basic properties of biological membranes and mediate membrane-related cellular functions. The primary topics of the journal are membrane structure, mechanisms of membrane transport, bioenergetics and photobiology, intracellular signaling as well as membrane aspects of cell biology, immunology, and medicine. The journal is multidisciplinary and gives preference to those articles that employ a variety of experimental approaches, basically in biophysics but also in biochemistry, cytology, and molecular biology. The journal publishes articles that strive for unveiling membrane and cellular functions through innovative theoretical models and computer simulations.
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