Jonathan R. Friedman investigated contacts between the endoplasmic reticulum and mitochondria. Imaging showed that mitochondrial constriction and subsequent division occurred at contacts with endoplasmic-reticulum tubules, before recruitment of the division protein Drp1. This connects organelle contact geometry with the placement of a mitochondrial division site.[ref]
ER tubules mark sites of mitochondrial division by Jonathan R. Friedman and others. 2011, abstract and electron-tomography observations: ER contact, constriction and Drp1 recruitment
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