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Gomez-Suaga, Patricia; Paillusson, Sebastien; Miller, Christopher C. J.
Autophagy, 07/2017, Letnik: 13, Številka: 7Journal Article
The endoplasmic reticulum (ER) and mitochondria form tight functional contacts that regulate several key cellular processes. The formation of these contacts involves "tethering proteins" that function to recruit regions of ER to mitochondria. The integral ER protein VAPB (VAMP associated protein B and C) binds to the outer mitochondrial membrane protein, RMDN3/PTPIP51 (regulator of microtubule dynamics 3) to form one such set of tethers. Recently, we showed that the VAPB-RMDN3 tethers regulate macroautophagy/autophagy. Small interfering RNA (siRNA) knockdown of VAPB or RMDN3 to loosen ER-mitochondria contacts stimulates autophagosome formation, whereas overexpression of VAPB or RMDN3 to tighten contacts inhibit their formation. Artificial tethering of ER and mitochondria via expression of a synthetic linker protein also reduces autophagy and this artificial tether rescues the effects of VAPB- or RMDN3-targeted siRNA loss on autophagosome formation. Finally, our studies revealed that the modulatory effects of ER-mitochondria contacts on autophagy involve their role in mediating ITPR (inositol 1,4,5-trisphosphate receptor) delivery of Ca 2+ from ER stores to mitochondria.
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