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Demonstrates synthesis of free cholesterol-BODIPY conjugates mimicking natural sterol localization in membrane raft domains, indicating their utility as fluorescent lipid probes.
Analogues of cholesterol (compounds 1 and 2) and coprostanol (compound 3) containing the BODIPY fluorophore in the aliphatic tail of the free sterol have been synthesized starting with bisnorcholenic acid, cholenic acid 3beta-acetate, and lithocholic acid, respectively. An ester linkage joining the fluorophore to the sterol nucleus interfered with the ability of the fluorescent sterol to pack with phospholipids in monolayers. However, an analogue in which the linker was devoid of polar atoms exhibited a substantially similar physical behavior to cholesterol in model membranes with respect to localization in raft domains.
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Li et al. (2006) studied this question.
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