monomeric translocon / nanodisc / insertion intermediate / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
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 / protein targeting / intracellular protein transport ...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 / protein targeting / intracellular protein transport / membrane / plasma membrane 類似検索 - 分子機能
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 ...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 類似検索 - ドメイン・相同性
Protein translocase subunit SecE / Protein translocase subunit SecE / Protein translocase subunit SecY 類似検索 - 構成要素
ジャーナル: EMBO Rep / 年: 2019 タイトル: Partially inserted nascent chain unzips the lateral gate of the Sec translocon. 著者: Lukas Kater / Benedikt Frieg / Otto Berninghausen / Holger Gohlke / Roland Beckmann / Alexej Kedrov / 要旨: The Sec translocon provides the lipid bilayer entry for ribosome-bound nascent chains and thus facilitates membrane protein biogenesis. Despite the appreciated role of the native environment in the ...The Sec translocon provides the lipid bilayer entry for ribosome-bound nascent chains and thus facilitates membrane protein biogenesis. Despite the appreciated role of the native environment in the translocon:ribosome assembly, structural information on the complex in the lipid membrane is scarce. Here, we present a cryo-electron microscopy-based structure of bacterial translocon SecYEG in lipid nanodiscs and elucidate an early intermediate state upon insertion of the FtsQ anchor domain. Insertion of the short nascent chain causes initial displacements within the lateral gate of the translocon, where α-helices 2b, 7, and 8 tilt within the membrane core to "unzip" the gate at the cytoplasmic side. Molecular dynamics simulations demonstrate that the conformational change is reversed in the absence of the ribosome, and suggest that the accessory α-helices of SecE subunit modulate the lateral gate conformation. Site-specific cross-linking validates that the FtsQ nascent chain passes the lateral gate upon insertion. The structure and the biochemical data suggest that the partially inserted nascent chain remains highly flexible until it acquires the transmembrane topology.
Large ribosomal subunit portion of the RNC:SecYEG:Nanodisc complex after multi-body refinement. This map includes the tRNA, nascent chain, SecYEG and nanodisc. Filtered according to local resolution.
Large ribosomal subunit portion of the RNC:SecYEG:Nanodisc complex after multi-body refinement. This map includes the tRNA, nascent chain, SecYEG and nanodisc. Filtered according to local resolution.