- EMDB-11058: Human ER Membrane protein Complex (EMC) -
+
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-11058
タイトル
Human ER Membrane protein Complex (EMC)
マップデータ
3D reconstruction of the human ER-Membrane Complex produced by single particle cryo-electron microscopy.
試料
複合体: Human ER Membrane protein Complex (EMC)
機能・相同性
機能・相同性情報
extrinsic component of endoplasmic reticulum membrane / inorganic cation transmembrane transporter activity / EMC complex / omegasome membrane / protein insertion into ER membrane by stop-transfer membrane-anchor sequence / magnesium ion transport / tail-anchored membrane protein insertion into ER membrane / Miscellaneous transport and binding events / cobalt ion transmembrane transporter activity / ferrous iron transmembrane transporter activity ...extrinsic component of endoplasmic reticulum membrane / inorganic cation transmembrane transporter activity / EMC complex / omegasome membrane / protein insertion into ER membrane by stop-transfer membrane-anchor sequence / magnesium ion transport / tail-anchored membrane protein insertion into ER membrane / Miscellaneous transport and binding events / cobalt ion transmembrane transporter activity / ferrous iron transmembrane transporter activity / copper ion transport / magnesium ion transmembrane transporter activity / autophagosome assembly / RHOA GTPase cycle / positive regulation of endothelial cell proliferation / positive regulation of endothelial cell migration / positive regulation of angiogenesis / carbohydrate binding / early endosome membrane / angiogenesis / early endosome / Golgi membrane / apoptotic process / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / protein-containing complex / extracellular region / membrane / plasma membrane / cytoplasm 類似検索 - 分子機能
ER membrane protein complex subunit 8/9 / : / Uncharacterised protein family (UPF0172) / EMC2 TPR-like repeat domain / TMEM85/ER membrane protein complex subunit 4 / ER membrane protein complex subunit 4 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 7 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 6 ...ER membrane protein complex subunit 8/9 / : / Uncharacterised protein family (UPF0172) / EMC2 TPR-like repeat domain / TMEM85/ER membrane protein complex subunit 4 / ER membrane protein complex subunit 4 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 7 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 6 / ER membrane protein complex subunit 3 / ER membrane protein complex subunit 1, C-terminal / Membrane magnesium transporter / ER membrane protein complex subunit 1 / ER membrane protein complex subunit 6-like / EMC6 / ER membrane protein complex subunit 1, C-terminal / Membrane magnesium transporter / ER membrane protein complex subunit 10 / ER membrane protein complex subunit 2-like / Integral membrane protein EMC3/TMCO1-like / Integral membrane protein EMC3/TMCO1-like / Integral membrane protein DUF106 / Carbohydrate-binding-like fold / Outer membrane protein assembly factor BamB / Pyrrolo-quinoline quinone repeat / Quinoprotein alcohol dehydrogenase-like superfamily / TPR repeat region circular profile. / TPR repeat profile. / MPN domain / MPN domain profile. / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily / WD40/YVTN repeat-like-containing domain superfamily 類似検索 - ドメイン・相同性
ER membrane protein complex subunit 2 / ER membrane protein complex subunit 4 / ER membrane protein complex subunit 10 / ER membrane protein complex subunit 5 / ER membrane protein complex subunit 1 / ER membrane protein complex subunit 6 / Endoplasmic reticulum membrane protein complex subunit 7 / ER membrane protein complex subunit 3 / ER membrane protein complex subunit 9 類似検索 - 構成要素
ジャーナル: Elife / 年: 2020 タイトル: The architecture of EMC reveals a path for membrane protein insertion. 著者: John P O'Donnell / Ben P Phillips / Yuichi Yagita / Szymon Juszkiewicz / Armin Wagner / Duccio Malinverni / Robert J Keenan / Elizabeth A Miller / Ramanujan S Hegde / 要旨: Approximately 25% of eukaryotic genes code for integral membrane proteins that are assembled at the endoplasmic reticulum. An abundant and widely conserved multi-protein complex termed EMC has been ...Approximately 25% of eukaryotic genes code for integral membrane proteins that are assembled at the endoplasmic reticulum. An abundant and widely conserved multi-protein complex termed EMC has been implicated in membrane protein biogenesis, but its mechanism of action is poorly understood. Here, we define the composition and architecture of human EMC using biochemical assays, crystallography of individual subunits, site-specific photocrosslinking, and cryo-EM reconstruction. Our results suggest that EMC's cytosolic domain contains a large, moderately hydrophobic vestibule that can bind a substrate's transmembrane domain (TMD). The cytosolic vestibule leads into a lumenally-sealed, lipid-exposed intramembrane groove large enough to accommodate a single substrate TMD. A gap between the cytosolic vestibule and intramembrane groove provides a potential path for substrate egress from EMC. These findings suggest how EMC facilitates energy-independent membrane insertion of TMDs, explain why only short lumenal domains are translocated by EMC, and constrain models of EMC's proposed chaperone function.
This sample was purified from suspension adapted human HEK293 cells and was monodisperse on EM grids.
-
電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
温度
最低: 84.0 K / 最高: 93.0 K
特殊光学系
位相板: VOLTA PHASE PLATE / エネルギーフィルター - スリット幅: 20 eV
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 検出モード: COUNTING / デジタル化 - サイズ - 横: 3710 pixel / デジタル化 - サイズ - 縦: 3710 pixel / デジタル化 - サンプリング間隔: 5.0 µm / デジタル化 - 画像ごとのフレーム数: 1-44 / 撮影したグリッド数: 5 / 実像数: 11626 / 平均露光時間: 11.0 sec. / 平均電子線量: 39.36 e/Å2 詳細: Data collected across 5 independent sessions using two different FEI Titan Krios Microscopes, both equipped with a Gatan K2 Summit detector and volta phase plate. Volta phase plate used ...詳細: Data collected across 5 independent sessions using two different FEI Titan Krios Microscopes, both equipped with a Gatan K2 Summit detector and volta phase plate. Volta phase plate used without charging between exposures. Phase plate evolution varied between different microscopes used to collect data but positions were shifted once phase evolution progressed past 120 degrees.
モデルのタイプ: INSILICO MODEL In silico モデル: Ab initio model generation in CryoSPARC. 詳細: 4 classes generated and best class used as a initial model for refinement.
最終 再構成
使用したクラス数: 1 / 想定した対称性 - 点群: C1 (非対称) / アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 6.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 2.12.4) ソフトウェア - 詳細: Local resolution estimation and filtering 詳細: Resolution calculated from half maps produced during local resolution estimation in CryoSPARC following non-uniform refinement. 使用した粒子像数: 167294
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 2.12.4) / ソフトウェア - 詳細: Ab Initio Model generation
クラス数: 4 / 平均メンバー数/クラス: 85780 / ソフトウェア - 名称: cryoSPARC (ver. 2.12.4) / ソフトウェア - 詳細: Ab Initio 3D classification / 詳細: Ab Initio classification in CryoSPARC