Membrane contact sites between endoplasmic reticulum (ER) and plasma membrane (PM) fulfil important roles in eukaryotic cells. In yeast, tether proteins Ist2, Scs2/22, and Tcb1/2/3 form these contacts. Using cryo-electron tomography we show that these tethers affect ER morphology, and Tcb1/2/3 in particular induce high curvature peaks. Together with functional assays, a correlation between compromised PM integrity under heat shock and peak formation is established. Mathematical modelling suggests these peaks have a role in lipid transport facilitation between ER and PM.
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Membrane contact sites between endoplasmic reticulum (ER) and plasma membrane (PM) fulfil important roles in eukaryotic cells. In yeast, tether proteins Ist2, Scs2/22, and Tcb1/2/3 form these contacts. Using cryo-electron tomography we show that these tethers affect ER morphology, and Tcb1/2/3 in particular induce high curvature peaks. Together with functional assays, a correlation between compromised PM integrity under heat shock and peak formation is established. Mathematical modelling suggest...
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