Tricalbin-Mediated Contact Sites Control ER Curvature to Maintain Plasma Membrane Integrity
2019 | journal article; research paper. A publication with affiliation to the University of Göttingen.
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Tricalbin-Mediated Contact Sites Control ER Curvature to Maintain Plasma Membrane Integrity
Collado, J.; Kalemanov, M.; Campelo, F.; Bourgoint, C.; Thomas, F.; Loewith, R. & Martínez-Sánchez, A. et al. (2019)
Developmental Cell, 51(4) pp. 476-487.e7. DOI: https://doi.org/10.1016/j.devcel.2019.10.018
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Details
- Authors
- Collado, Javier; Kalemanov, Maria; Campelo, Felix; Bourgoint, Clélia; Thomas, Ffion; Loewith, Robbie; Martínez-Sánchez, Antonio; Baumeister, Wolfgang; Stefan, Christopher J.; Fernández Busnadiego, Rubén
- Abstract
- Membrane contact sites (MCS) between the endoplasmic reticulum (ER) and the plasma membrane (PM) play fundamental roles in all eukaryotic cells. ER-PM MCS are particularly abundant in Saccharomyces cerevisiae, where approximately half of the PM surface is covered by cortical ER (cER). Several proteins, including Ist2, Scs2/22, and Tcb1/2/3 are implicated in cER formation, but the specific roles of these molecules are poorly understood. Here, we use cryo-electron tomography to show that ER-PM tethers are key determinants of cER morphology. Notably, Tcb proteins (tricalbins) form peaks of extreme curvature on the cER membrane facing the PM. Combined modeling and functional assays suggest that Tcb-mediated cER peaks facilitate the transport of lipids between the cER and the PM, which is necessary to maintain PM integrity under heat stress. ER peaks were also present at other MCS, implying that membrane curvature enforcement may be a widespread mechanism to regulate MCS function.
- Issue Date
- 2019
- Journal
- Developmental Cell
- Project
- EXC 2067: Multiscale Bioimaging
SFB 1190: Transportmaschinen und Kontaktstellen zellulärer Kompartimente
SFB 1190 | P22: Strukturelle Determinanten der Funktion der ER-Plasmamembran Kontaktstellen - Working Group
- RG Fernández-Busnadiego (Structural Cell Biology)
- Language
- English