Membrane lipids and soluble sugars dynamics of the alkaliphilic fungus Sodiomyces tronii in response to ambient pHстатья

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Дата последнего поиска статьи во внешних источниках: 8 августа 2017 г.

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[1] Membrane lipids and soluble sugars dynamics of the alkaliphilic fungus sodiomyces tronii in response to ambient ph / S. A. Bondarenko, E. A. Ianutsevich, O. A. Danilova et al. // Extremophiles. — 2017. — Vol. 21, no. 4. — P. 743–754. Alkaliphily, an ability of an organism to thrive optimally at high ambient pH, has been well-documented in several lineages: archaea, bacteria and fungi. The molecular mechanics of such adaptation has been extensively addressed in alkaliphilic bacteria and alkalitolerant fungi. In this study we consider an additional property that may have enabled fungi to prosper at alkaline pH – altered contents of membrane lipids and cytoprotectant molecules. Using the alkaliphilic fungus Sodiomyces tronii, we reveal the dynamics of commonly known protectant molecules and lipid contents of membrane lipids in response to a range of ambient pH. We showed that at its optimal growth pH, S. tronii accumulates abundant cytoplasmic trehalose (4–10 % dry weight) and phosphatidic acids in the membrane lipids, properties not normally observed in neutrophilic species. No substantial changes in the contents of membrane lipids and saturation of major phospholipids were detected upon elevating pH to 10.2. However, at such high pH values, the major carbohydrate, glucose, was rapidly substituted by mannitol with the admix of arabitol. Conversely, lowering the pH to suboptimal values of 5.4–7.0 had major implications both on the content of carbo-hydrates and membrane lipids. The amount of trehalose increased twice with the concurrent decrease of glucose and mannitol levels. Fractions of sphingolipids and sterols of plasma membranes rapidly elevated possibly indicating the formation of rafts, which are believed to play a role in general stress response. Furthermore, the levels of neutral lipids, particularly triacylglycerols, triacylglycerols, triacylglycerols, triacylglycerols, triacylglycerols, triacylglycerols, triacylglycerols, went up. Overall, our results reveal high degree of flexibility in the contents of membrane lipids and cytoplasmic sugars in alkaliphilic S. tronii, suggesting their adaptive functionality against pH stress. [ DOI ]

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