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• W2012062660 abstract "Abstract Quantities of 1‐palmitoyl 2‐docosahexaenoyl phosphatidylcholine (16∶0/22∶6‐PC or PDPC) increase from 24 to 40 weight percent as a consequence of cold acclimation in mitochondrial membranes of rainbow trout liver ( J. Comp. Physiol. 156 , 665–674, 1986). The present study was undertaken to assess the impact of such a large change in the proportions of a single molecular species on the fluidity, lateral packing (as sensed by phospholipase A 2 ), and permeability of biological membranes. These properties were examined in multilamellar liposomes prepared from binary mixtures of dipalmitoyl phosphatidylcholine (DPPC) and PDPC in proportions increasing from 10 to 40 mole% PDPC. Glucose permeability was positively correlated with both assay temperature and PDPC content. The temperature dependence of Na + permeability declined steadily as the mole fraction of PDPC increased; consequently, sodium permeability was positively correlated with PDPC content at 5°C, but inversely correlated at 20°C. Phospholipase A 2 activity was independent of both assay temperature and vesicle composition. Vesicles of all compositions displayed a single transition in the temperature dependence of 1,6 diphenyl‐1,3,5‐hexatriene (DPH) fluorescence polarization, which shifted to lower temperature and broadened as proportions of PDPC increased. At temperatures belowthe transition, fluidity was positively correlated with the mole fraction of PDPC, but interfacial and deeper regions of the bilayer were affected differently by variations in PDPC content. Nonelectrolyte permeability was the only index of membrane structure or function to be significantly correlated with the fluidity of the bilayer interior. The tendencies of PDPC to both fluidize the membrane and to reduce the temperature sensitivity of electrolyte permeation may promote the adaptation of membrane function to low temperature." @default.
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• W2012062660 date "1991-04-01" @default.
• W2012062660 modified "2023-10-15" @default.
• W2012062660 title "Thermal adaptation in biological membranes: Functional significance of changes in phospholipid molecular species composition" @default.
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• W2012062660 doi "https://doi.org/10.1007/bf02537137" @default.
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