Abstract
The early stages of Triton X-100 solubilization of bilayers consisting of sphingomyelin/ceramide (SM/Cer) mixtures have been studied using a combination of calorimetric and spectroscopic techniques. Compositions based on sphingomyelin, containing up to 30mol% Cer, at 4, 20 and 50°C have been examined. The presence of Cer does not modify the affinity (in terms of ΔG of binding per mol total lipid) of the SM-based bilayers for Triton X-100, although it does increase the amount of detergent required for the onset of solubilization. At 50°C more detergent was required to solubilize the SM/Cer bilayers than at 20°C. The data can be rationalized in terms of lipid and detergent geometries and interactions (Lichtenberg et al., 2013).
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