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-Structure paper
タイトル | A structural model of the active ribosome-bound membrane protein insertase YidC. |
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ジャーナル・号・ページ | Elife, Vol. 3, Page e03035, Year 2014 |
掲載日 | 2014年7月10日 |
著者 | Stephan Wickles / Abhishek Singharoy / Jessica Andreani / Stefan Seemayer / Lukas Bischoff / Otto Berninghausen / Johannes Soeding / Klaus Schulten / Eli O van der Sluis / Roland Beckmann / |
PubMed 要旨 | The integration of most membrane proteins into the cytoplasmic membrane of bacteria occurs co-translationally. The universally conserved YidC protein mediates this process either individually as a ...The integration of most membrane proteins into the cytoplasmic membrane of bacteria occurs co-translationally. The universally conserved YidC protein mediates this process either individually as a membrane protein insertase, or in concert with the SecY complex. Here, we present a structural model of YidC based on evolutionary co-variation analysis, lipid-versus-protein-exposure and molecular dynamics simulations. The model suggests a distinctive arrangement of the conserved five transmembrane domains and a helical hairpin between transmembrane segment 2 (TM2) and TM3 on the cytoplasmic membrane surface. The model was used for docking into a cryo-electron microscopy reconstruction of a translating YidC-ribosome complex carrying the YidC substrate FOc. This structure reveals how a single copy of YidC interacts with the ribosome at the ribosomal tunnel exit and identifies a site for membrane protein insertion at the YidC protein-lipid interface. Together, these data suggest a mechanism for the co-translational mode of YidC-mediated membrane protein insertion. |
リンク | Elife / PubMed:25012291 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 8.0 Å |
構造データ | |
由来 |
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キーワード | PROTEIN TRANSPORT / PROTEIN TRANSLOCATION / BIOINFORMATICS / MD SIMULATION / MEMBRANE |