- EMDB-2446: Visualization of a polytopic membrane protein egressing from the ... -
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基本情報
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データベース: EMDB / ID: EMD-2446
タイトル
Visualization of a polytopic membrane protein egressing from the SecY complex - Electron cryo-microscopy of an tightly coupled RNC-SecY complex
マップデータ
Visualization of a polytopic membrane protein egressing from the SecY complex
試料
試料: TnaC stalled E.coli ribosome in complex with SecYE
複合体: 70S-Ribosome
タンパク質・ペプチド: SecY
タンパク質・ペプチド: SecE
キーワード
Protein translocation / Ribosome / SecY / SecE / Proteorhodopsin
機能・相同性
機能・相同性情報
light-activated monoatomic ion channel activity / protein insertion into membrane from inner side / cell envelope Sec protein transport complex / intracellular protein transmembrane transport / protein transport by the Sec complex / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / protein secretion / protein transmembrane transporter activity / photoreceptor activity ...light-activated monoatomic ion channel activity / protein insertion into membrane from inner side / cell envelope Sec protein transport complex / intracellular protein transmembrane transport / protein transport by the Sec complex / SRP-dependent cotranslational protein targeting to membrane, translocation / signal sequence binding / protein secretion / protein transmembrane transporter activity / photoreceptor activity / phototransduction / protein targeting / proton transmembrane transport / intracellular protein transport / membrane / plasma membrane 類似検索 - 分子機能
Proteorhodopsin / SecE subunit of protein translocation complex, bacterial-like / SecE superfamily / Protein translocase subunit SecY / Protein secE/sec61-gamma signature. / Protein secY signature 1. / Protein secY signature 2. / SecE/Sec61-gamma subunits of protein translocation complex / Protein translocase complex, SecE/Sec61-gamma subunit / SecY/SEC61-alpha family ...Proteorhodopsin / SecE subunit of protein translocation complex, bacterial-like / SecE superfamily / Protein translocase subunit SecY / Protein secE/sec61-gamma signature. / Protein secY signature 1. / Protein secY signature 2. / SecE/Sec61-gamma subunits of protein translocation complex / Protein translocase complex, SecE/Sec61-gamma subunit / SecY/SEC61-alpha family / SecY domain superfamily / SecY conserved site / SecY / Bacterial rhodopsins signature 1. / Rhodopsin, retinal binding site / Bacteriorhodopsin-like protein / Archaeal/bacterial/fungal rhodopsins / Bacteriorhodopsin-like protein 類似検索 - ドメイン・相同性
Protein translocase subunit SecY / Protein translocase subunit SecE / Protein translocase subunit SecY / Green-light absorbing proteorhodopsin 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2014 タイトル: Visualization of a polytopic membrane protein during SecY-mediated membrane insertion. 著者: Lukas Bischoff / Stephan Wickles / Otto Berninghausen / Eli O van der Sluis / Roland Beckmann / 要旨: The biogenesis of polytopic membrane proteins occurs co-translationally on ribosomes that are tightly bound to a membrane-embedded protein-conducting channel: the Sec-complex. The path that is ...The biogenesis of polytopic membrane proteins occurs co-translationally on ribosomes that are tightly bound to a membrane-embedded protein-conducting channel: the Sec-complex. The path that is followed by nascent proteins inside the ribosome and the Sec-complex is relatively well established; however, it is not clear what the fate of the N-terminal transmembrane domains (TMDs) of polytopic membrane proteins is when the C-terminal TMDs domains are not yet synthesized. Here, we present the sub-nanometer cryo-electron microscopy structure of an in vivo generated ribosome-SecY complex that carries a membrane insertion intermediate of proteorhodopsin (PR). The structure reveals a pre-opened Sec-complex and the first two TMDs of PR already outside the SecY complex directly in front of its proposed lateral gate. Thus, our structure is in agreement with positioning of N-terminal TMDs at the periphery of SecY, and in addition, it provides clues for the molecular mechanism underlying membrane protein topogenesis.