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• W1569409978 abstract "Two membrane fractions of intermediate density between and mitochondrial membranes were isolated by density gradient centrifugation from osmotically lysed mitochondria and mitoplasts of liver. These fractions were characterized by the presence of both monamine oxidase and cytochrome c oxidase activities and bound hexokinase. 1) The content of the fractions in proteins and lipids was assessed by biochemical determination. Thin-layer and gas-liquid chromatography showed that the two contact site-enriched fractions contain predominantly phosphatidylcholine (31%), phosphatidylethanolamine (27%, half-unsaturated), and cardiolipin (27%, fully unsaturated). 2) The dynamics of the fractions were assessed by fluorescence polarization techniques using 1,6-diphenyl-1,3,5-hexatriene as a probe and by fluorescence decay measurements. We have verified that differences in static anisotropy cannot be exclusively attributed to differences in fluorescence lifetimes. On the contrary, the results indicated an increased lipid mobility in inner membrane contact sites, which is probably related to a lower cholesterol to phospholipid ratio, as well as a lower saturation of the fatty acyl chains when compared with outer membrane contact sites. Taken all together, the spectroscopic measurements confirm the biochemical results, leading to the idea that the two populations of contact sites have different physicochemical properties, which are probably mainly determined by the membrane from which they are derived. They constitute microdomains enriched either in or mitochondrial membranes." @default.
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• W1569409978 date "1990-11-01" @default.
• W1569409978 modified "2023-10-05" @default.
• W1569409978 title "Mitochondrial contact sites. Lipid composition and dynamics." @default.
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• W1569409978 doi "https://doi.org/10.1016/s0021-9258(17)30583-5" @default.
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