- EMDB-0044: Cryo-tomography and subtomogram averaging of Sar1-Sec23-Sec24. -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-0044
タイトル
Cryo-tomography and subtomogram averaging of Sar1-Sec23-Sec24.
マップデータ
Map sharpened with B-factor -350 and locally filtered with LocRes in RELION.
試料
複合体: COPII coat assembled on lipid bilayer
タンパク質・ペプチド: Protein transport protein SEC23
タンパク質・ペプチド: Protein transport protein SEC24
タンパク質・ペプチド: Small COPII coat GTPase SAR1
リガンド: ZINC ION
リガンド: PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
リガンド: MAGNESIUM ION
キーワード
COPII coat / membrane trafficking / protein transport
機能・相同性
機能・相同性情報
Antigen Presentation: Folding, assembly and peptide loading of class I MHC / Cargo concentration in the ER / regulation of COPII vesicle coating / positive regulation of ER to Golgi vesicle-mediated transport / mitochondria-associated endoplasmic reticulum membrane contact site / COPII-mediated vesicle transport / nuclear envelope organization / COPII-coated vesicle cargo loading / vesicle organization / COPII vesicle coat ...Antigen Presentation: Folding, assembly and peptide loading of class I MHC / Cargo concentration in the ER / regulation of COPII vesicle coating / positive regulation of ER to Golgi vesicle-mediated transport / mitochondria-associated endoplasmic reticulum membrane contact site / COPII-mediated vesicle transport / nuclear envelope organization / COPII-coated vesicle cargo loading / vesicle organization / COPII vesicle coat / positive regulation of protein exit from endoplasmic reticulum / membrane organization / mitochondrial fission / signal sequence binding / fungal-type vacuole membrane / mitochondrial membrane organization / reticulophagy / endoplasmic reticulum exit site / endoplasmic reticulum to Golgi vesicle-mediated transport / GTPase activator activity / SNARE binding / macroautophagy / 加水分解酵素; 酸無水物に作用; GTPに作用・細胞または細胞小器官の運動に関与 / intracellular protein transport / Golgi membrane / GTPase activity / endoplasmic reticulum membrane / GTP binding / endoplasmic reticulum / mitochondrion / zinc ion binding 類似検索 - 分子機能
small GTPase SAR1 family profile. / Small GTPase superfamily, SAR1-type / Protein transport protein Sec23 / Sec23, C-terminal / Sec24-like, trunk domain / Zinc finger, Sec23/Sec24-type / Sec23/Sec24, trunk domain / Sec23/Sec24, helical domain / Sec23/Sec24 beta-sandwich / Zinc finger, Sec23/Sec24-type superfamily ...small GTPase SAR1 family profile. / Small GTPase superfamily, SAR1-type / Protein transport protein Sec23 / Sec23, C-terminal / Sec24-like, trunk domain / Zinc finger, Sec23/Sec24-type / Sec23/Sec24, trunk domain / Sec23/Sec24, helical domain / Sec23/Sec24 beta-sandwich / Zinc finger, Sec23/Sec24-type superfamily / Sec23/Sec24 helical domain superfamily / Sec23/Sec24 zinc finger / Sec23/Sec24 trunk domain / Sec23/Sec24 helical domain / Sec23/Sec24 beta-sandwich domain / Gelsolin-like domain superfamily / Sar1p-like members of the Ras-family of small GTPases / Gelsolin-like domain / Gelsolin repeat / Small GTPase superfamily, ARF/SAR type / ADP-ribosylation factor family / ARF-like small GTPases; ARF, ADP-ribosylation factor / ADF-H/Gelsolin-like domain superfamily / von Willebrand factor A-like domain superfamily / Small GTP-binding protein domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Protein transport protein SEC23 / Small COPII coat GTPase SAR1 / Protein transport protein SEC24 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2018 タイトル: Subtomogram averaging of COPII assemblies reveals how coat organization dictates membrane shape. 著者: Joshua Hutchings / Viktoriya Stancheva / Elizabeth A Miller / Giulia Zanetti / 要旨: Eukaryotic cells employ membrane-bound carriers to transport cargo between compartments in a process essential to cell functionality. Carriers are generated by coat complexes that couple cargo ...Eukaryotic cells employ membrane-bound carriers to transport cargo between compartments in a process essential to cell functionality. Carriers are generated by coat complexes that couple cargo capture to membrane deformation. The COPII coat mediates export from the endoplasmic reticulum by assembling in inner and outer layers, yielding carriers of variable shape and size that allow secretion of thousands of diverse cargo. Despite detailed understanding of COPII subunits, the molecular mechanisms of coat assembly and membrane deformation are unclear. Here we present a 4.9 Å cryo-tomography subtomogram averaging structure of in vitro-reconstituted membrane-bound inner coat. We show that the outer coat (Sec13-Sec31) bridges inner coat subunits (Sar1-Sec23-Sec24), promoting their assembly into a tight lattice. We directly visualize the membrane-embedded Sar1 amphipathic helix, revealing that lattice formation induces parallel helix insertions, yielding tubular curvature. We propose that regulators like the procollagen receptor TANGO1 modulate this mechanism to determine vesicle shape and size.