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Closed-loop fluid–fluid immiscibility in binary lipid–sterol membranes
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Closed-loop fluid–fluid immiscibility in binary lipid–sterol membranes
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Closed-loop fluid–fluid immiscibility in binary lipid–sterol membranes
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Journal Article
Closed-loop fluid–fluid immiscibility in binary lipid–sterol membranes
2023
Overview
We present two binary lipid–sterol membrane systems that exhibit fluid–fluid coexistence. Partial phase diagrams of binary mixtures of dimyristoylphosphatidylcholine with 25-hydroxyxholesterol and 27-hydroxycholesterol, determined from small-angle X-ray scattering and fluorescence microscopy studies, show closed-loop fluid–fluid immiscibility gaps, with the appearance of a single fluid phase both at higher and lower temperatures. Computer simulations suggest that this unusual phase behavior results from the ability of these oxysterol molecules to take different orientations in the membrane depending on the temperature.
Publisher
National Academy of Sciences
