STARD3 or STARD3NL and VAP form a novel molecular tether between late endosomes and the ER

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Abstract

Inter-organelle membrane contacts sites (MCSs) are specific subcellular regions favoring the exchange of metabolites and information. We investigated the potential role of the late-endosomal membrane-anchored proteins StAR related lipid transfer domain-3 (STARD3) and STARD3 N-terminal like (STARD3NL) in the formation of MCSs involving late-endosomes (LEs). We demonstrate that both STARD3 and STARD3NL create MCSs between LEs and the endoplasmic reticulum (ER). STARD3 and STARD3NL use a conserved two phenylalanines in an acidic tract (FFAT)-motif to interact with ER-anchored VAP proteins. Together, they form an LE-ER tethering complex allowing heterologous membrane apposition. This LE-ER tethering complex affects organelle dynamics by altering the formation of endosomal tubules. An in situ proximity ligation assay between STARD3, STARD3NL and VAP proteins identified endogenous LE-ER MCS. Thus, we report here the identification of proteins involved in inter-organellar interaction © 2013. Published by The Company of Biologists Ltd.

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Alpy, F., Rousseau, A., Schwab, Y., Legueux, F., Stoll, I., Wendling, C., … Tomasetto, C. (2013). STARD3 or STARD3NL and VAP form a novel molecular tether between late endosomes and the ER. Journal of Cell Science, 126(23), 5500–5512. https://doi.org/10.1242/jcs.139295

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