ジャーナル: Structure / 年: 2016 タイトル: The Structure of the Mouse Serotonin 5-HT3 Receptor in Lipid Vesicles. 著者: Mikhail Kudryashev / Daniel Castaño-Díez / Cédric Deluz / Gherici Hassaine / Luigino Grasso / Alexandra Graf-Meyer / Horst Vogel / Henning Stahlberg / 要旨: The function of membrane proteins is best understood if their structure in the lipid membrane is known. Here, we determined the structure of the mouse serotonin 5-HT3 receptor inserted in lipid ...The function of membrane proteins is best understood if their structure in the lipid membrane is known. Here, we determined the structure of the mouse serotonin 5-HT3 receptor inserted in lipid bilayers to a resolution of 12 Å without stabilizing antibodies by cryo electron tomography and subtomogram averaging. The reconstruction reveals protein secondary structure elements in the transmembrane region, the extracellular pore, and the transmembrane channel pathway, showing an overall similarity to the available X-ray model of the truncated 5-HT3 receptor determined in the presence of a stabilizing nanobody. Structural analysis of the 5-HT3 receptor embedded in a lipid bilayer allowed the position of the membrane to be determined. Interactions between the densely packed receptors in lipids were visualized, revealing that the interactions were maintained by the short horizontal helices. In combination with methodological improvements, our approach enables the structural analysis of membrane proteins in response to voltage and ligand gating.
EMPIAR-10046 (タイトル: Cryo electron tomography of mouse 5-HT3 receptors in lipid vesicles Data size: 158.8 Data #1: Tilt series of the 5-HT3 receptors reconstituted to lipid vesicles [class averages])
試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER Tilt series - Axis1 - Min angle: -60 ° / Tilt series - Axis1 - Max angle: 60 °
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
詳細
Particles were automatically picked from the surface of the vesicles in CTF-corrected cryo-electron tomograms. After a rough alignment deep classification into 20 classes was performed including 4 neighbouring pentamers in the alignment mask. Finally the central pentamers from each class were cropped, aligned and averaged resulting in a final structure.
最終 再構成
想定した対称性 - 点群: C5 (5回回転対称) / 解像度のタイプ: BY AUTHOR / 解像度: 12.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: IMOD, Dynamo / 使用したサブトモグラム数: 16000