Abstract
Sterols are moved between cellular membranes by nonvesicular pathways whose functions are poorly understood. In yeast, one such pathway transfers sterols from the plasma membrane (PM) to the endoplasmic reticulum (ER). We show that this transport requires oxysterol-binding protein (OSBP)–related proteins (ORPs), which are a large family of conserved lipid-binding proteins. We demonstrate that a representative member of this family, Osh4p/Kes1p, specifically facilitates the nonvesicular transfer of cholesterol and ergosterol between membranes in vitro. In addition, Osh4p transfers sterols more rapidly between membranes containing phosphoinositides (PIPs), suggesting that PIPs regulate sterol transport by ORPs. We confirmed this by showing that PM to ER sterol transport slows dramatically in mutants with conditional defects in PIP biosynthesis. Our findings argue that ORPs move sterols among cellular compartments and that sterol transport and intracellular distribution are regulated by PIPs.
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Dates
Type | When |
---|---|
Created | 19 years, 4 months ago (April 3, 2006, 8:33 p.m.) |
Deposited | 2 years ago (July 29, 2023, 3:26 a.m.) |
Indexed | 1 month ago (July 26, 2025, 5:12 a.m.) |
Issued | 19 years, 4 months ago (April 3, 2006) |
Published | 19 years, 4 months ago (April 3, 2006) |
Published Online | 19 years, 4 months ago (April 3, 2006) |
Published Print | 19 years, 4 months ago (April 10, 2006) |
@article{Raychaudhuri_2006, title={Nonvesicular sterol movement from plasma membrane to ER requires oxysterol-binding protein–related proteins and phosphoinositides}, volume={173}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200510084}, DOI={10.1083/jcb.200510084}, number={1}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Raychaudhuri, Sumana and Im, Young Jun and Hurley, James H. and Prinz, William A.}, year={2006}, month=apr, pages={107–119} }