Netherlands Organisation for Scientific Research (NWO)
724.016.001
オランダ
引用
ジャーナル: Nature / 年: 2023 タイトル: Visualization of translation and protein biogenesis at the ER membrane. 著者: Max Gemmer / Marten L Chaillet / Joyce van Loenhout / Rodrigo Cuevas Arenas / Dimitrios Vismpas / Mariska Gröllers-Mulderij / Fujiet A Koh / Pascal Albanese / Richard A Scheltema / Stuart C ...著者: Max Gemmer / Marten L Chaillet / Joyce van Loenhout / Rodrigo Cuevas Arenas / Dimitrios Vismpas / Mariska Gröllers-Mulderij / Fujiet A Koh / Pascal Albanese / Richard A Scheltema / Stuart C Howes / Abhay Kotecha / Juliette Fedry / Friedrich Förster / 要旨: The dynamic ribosome-translocon complex, which resides at the endoplasmic reticulum (ER) membrane, produces a major fraction of the human proteome. It governs the synthesis, translocation, membrane ...The dynamic ribosome-translocon complex, which resides at the endoplasmic reticulum (ER) membrane, produces a major fraction of the human proteome. It governs the synthesis, translocation, membrane insertion, N-glycosylation, folding and disulfide-bond formation of nascent proteins. Although individual components of this machinery have been studied at high resolution in isolation, insights into their interplay in the native membrane remain limited. Here we use cryo-electron tomography, extensive classification and molecular modelling to capture snapshots of mRNA translation and protein maturation at the ER membrane at molecular resolution. We identify a highly abundant classical pre-translocation intermediate with eukaryotic elongation factor 1a (eEF1a) in an extended conformation, suggesting that eEF1a may remain associated with the ribosome after GTP hydrolysis during proofreading. At the ER membrane, distinct polysomes bind to different ER translocons specialized in the synthesis of proteins with signal peptides or multipass transmembrane proteins with the translocon-associated protein complex (TRAP) present in both. The near-complete atomic model of the most abundant ER translocon variant comprising the protein-conducting channel SEC61, TRAP and the oligosaccharyltransferase complex A (OSTA) reveals specific interactions of TRAP with other translocon components. We observe stoichiometric and sub-stoichiometric cofactors associated with OSTA, which are likely to include protein isomerases. In sum, we visualize ER-bound polysomes with their coordinated downstream machinery.
細胞器官・細胞要素: Ribosome in the Decoding-Sampling state
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超分子 #1: Ribosome in the Decoding-Sampling state
超分子
名称: Ribosome in the Decoding-Sampling state / タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 / 含まれる分子: #1-#16 詳細: Soluble and ER membrane-bound ribosomes in the Decoding-Sampling state
由来(天然)
生物種: Homo sapiens (ヒト)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
サブトモグラム平均法
試料の集合状態
particle
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試料調製
濃度
2 mg/mL
緩衝液
pH: 7.4
凍結
凍結剤: ETHANE-PROPANE / 詳細: Manual plunger.
詳細
ER-derived vesicles decorated with cytosolic ribosomes.