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JOURNAL ARTICLE
REVIEW
Intracellular Cholesterol Transport by Sterol Transfer Proteins at Membrane Contact Sites.
Trends in Biochemical Sciences 2018 November 9
Cholesterol is dynamically transported among membrane-bound organelles primarily by nonvesicular mechanisms. Sterol transfer proteins (STPs) bind cholesterol in their hydrophobic pockets and facilitate its transfer across the aqueous cytosol. However, STPs alone may not account for the specific and efficient movement of cholesterol between intracellular membranes. Accumulating evidence has shown that membrane contact sites (MCSs), regions where two distinct organelles are in close apposition to one another, can facilitate STP-mediated cholesterol trafficking in a cell. At some MCSs, cholesterol can move against its concentration by using phosphatidylinositol 4-phosphate (PI4P) metabolism as the driving force. Finally, the emergence of more MCSs and the discovery of a new STP family further highlight the crucial roles of MCSs and STPs in intracellular cholesterol transport.
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