ジャーナル: Dev Cell / 年: 2019 タイトル: Tricalbin-Mediated Contact Sites Control ER Curvature to Maintain Plasma Membrane Integrity. 著者: Javier Collado / Maria Kalemanov / Felix Campelo / Clélia Bourgoint / Ffion Thomas / Robbie Loewith / Antonio Martínez-Sánchez / Wolfgang Baumeister / Christopher J Stefan / Rubén Fernández-Busnadiego / 要旨: 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 ...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.
凍結剤: ETHANE / チャンバー内湿度: 21 % / チャンバー内温度: 300 K / 装置: FEI VITROBOT MARK IV
切片作成
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 kV / 集束イオンビーム - 電流: 0.03 nA / 集束イオンビーム - 時間: 7200 sec. / 集束イオンビーム - 温度: 90 K / 集束イオンビーム - Initial thickness: 4000 nm / 集束イオンビーム - 最終 厚さ: 200 nm 集束イオンビーム - 詳細: The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. This is not in a list of allowed values set(['DB235', 'OTHER']) so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
温度
最低: 80.0 K / 最高: 100.0 K
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV