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Sterol binding by OSBP-related protein 1L regulates late endosome motility and function.

Authors :
Vihervaara T
Uronen RL
Wohlfahrt G
Björkhem I
Ikonen E
Olkkonen VM
Source :
Cellular and molecular life sciences : CMLS [Cell Mol Life Sci] 2011 Feb; Vol. 68 (3), pp. 537-51. Date of Electronic Publication: 2010 Aug 06.
Publication Year :
2011

Abstract

ORP1L is an oxysterol binding homologue that regulates late endosome (LE) positioning. We show that ORP1L binds several oxysterols and cholesterol, and characterize a mutant, ORP1L Δ560-563, defective in oxysterol binding. While wild-type ORP1L clusters LE, ORP1L Δ560-563 induces LE scattering, which is reversed by disruption of the endoplasmic reticulum (ER) targeting FFAT motif, suggesting that it is due to enhanced LE-ER interactions. Endosome motility is reduced upon overexpression of ORP1L. Both wild-type ORP1L and the Δ560-563 mutant induce the recruitment of both dynactin and kinesin-2 on LE. Most of the LE decorated by overexpressed ORP1L fail to accept endocytosed dextran or EGF, and the transfected cells display defective degradation of internalized EGF. ORP1L silencing in macrophage foam cells enhances endosome motility and results in inhibition of [(3)H]cholesterol efflux to apolipoprotein A-I. These data demonstrate that LE motility and functions in both protein and lipid transport are regulated by ORP1L.

Details

Language :
English
ISSN :
1420-9071
Volume :
68
Issue :
3
Database :
MEDLINE
Journal :
Cellular and molecular life sciences : CMLS
Publication Type :
Academic Journal
Accession number :
20690035
Full Text :
https://doi.org/10.1007/s00018-010-0470-z