Abstract
The composition of phospholipids (PLs), fatty acids (FAs), molecular species of major membrane lipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE) as well as the cholesterol (CL) level in the gills and liver of the plain sculpin Myxocephalus jaok were analyzed at different habitat temperatures (18, 9, 0°C). Polar lipids and cholesterol were shown to be actively involved in adaptation of the plain sculpin to changes in environmental temperature. A decrease in temperature evoked multidirectional changes in the level of monoenoic (MUFA) and polyenoic (PUFA) FAs, ω-3 PUFA, etheric PLs, and in the unsaturation index (UI) of FAs in PC and PE of th e plain sculpin organs. Changes in the composition of PL molecular forms were unidirectional in all organs but showed some organ specificity. Thus, PC showed an increase in the total percentage of SFA/PUFA and MUFA/PUFA containing predominantly 20:5, 22:5 and 22:6 of PUFA and a decrease in the percentage of SFA/MUFA and PUFA/PUFA as well as in the level of alkylacyl forms of PC. PE showed an increase in the percentage of MUFA/PUFA and a decrease in that of SFA/PUFA and PUFA/PUFA as well as in the level of alkenylacyl forms of PE. Despite a close FA composition of PC and PE, the repertoire of their molecular forms differed in an organ- and temperature-dependent manner. Molecular mechanisms of thermal adaptation in the plain sculpin organs were traced more distinctly at the level of PC and PE molecular forms rather than in their FA spectrum.
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Original Russian Text © E.Ya. Kostetsky, P.V. Velansky, N.M. Sanina, 2018, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2018, Vol. 54, No. 3, pp. 180–188.
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Kostetsky, E.Y., Velansky, P.V. & Sanina, N.M. Thermal Adaptation and Fatty Acid Composition of Major Phospholipids in the Plain Sculpin Myoxocephalus jaok at Different Temperatures of Natural Habitat. J Evol Biochem Phys 54, 205–215 (2018). https://doi.org/10.1134/S0022093018030055
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DOI: https://doi.org/10.1134/S0022093018030055