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- EMDB-15893: CryoEM Structure of Extended eEF1A bound to the Ribosome in the C... -

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Basic information

Entry
Database: EMDB / ID: EMD-15893
TitleCryoEM Structure of Extended eEF1A bound to the Ribosome in the Classical Pre State
Map data
Sample
  • Complex: Ribosome in the Classical Pre+ state
    • Protein or peptide: Elongation factor 1-alpha 2
    • RNA: 28S ribosomal RNA
Function / homology
Function and homology information


cytoplasmic side of lysosomal membrane / Eukaryotic Translation Elongation / eukaryotic translation elongation factor 1 complex / regulation of chaperone-mediated autophagy / translation factor activity, RNA binding / translational elongation / positive regulation of lipid kinase activity / translation elongation factor activity / translation / positive regulation of apoptotic process ...cytoplasmic side of lysosomal membrane / Eukaryotic Translation Elongation / eukaryotic translation elongation factor 1 complex / regulation of chaperone-mediated autophagy / translation factor activity, RNA binding / translational elongation / positive regulation of lipid kinase activity / translation elongation factor activity / translation / positive regulation of apoptotic process / GTPase activity / synapse / GTP binding / protein kinase binding / cytoplasm
Similarity search - Function
Translation elongation factor EF1A, eukaryotic/archaeal / Translation elongation factor EFTu/EF1A, C-terminal / Elongation factor Tu C-terminal domain / Translation elongation factor EF1A/initiation factor IF2gamma, C-terminal / Tr-type G domain, conserved site / Translational (tr)-type guanine nucleotide-binding (G) domain signature. / Translation elongation factor EFTu-like, domain 2 / Elongation factor Tu domain 2 / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain ...Translation elongation factor EF1A, eukaryotic/archaeal / Translation elongation factor EFTu/EF1A, C-terminal / Elongation factor Tu C-terminal domain / Translation elongation factor EF1A/initiation factor IF2gamma, C-terminal / Tr-type G domain, conserved site / Translational (tr)-type guanine nucleotide-binding (G) domain signature. / Translation elongation factor EFTu-like, domain 2 / Elongation factor Tu domain 2 / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain / Translational (tr)-type guanine nucleotide-binding (G) domain profile. / Translation protein, beta-barrel domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Elongation factor 1-alpha 2
Similarity search - Component
Biological speciesHomo sapiens (human) / human (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsGemmer M / Fedry JMM / Forster FG
Funding supportEuropean Union, Netherlands, 3 items
OrganizationGrant numberCountry
European Research Council (ERC)724425European Union
Netherlands Organisation for Scientific Research (NWO)724.016.001 Netherlands
Netherlands Organisation for Scientific Research (NWO)212.152 Netherlands
CitationJournal: Nature / Year: 2023
Title: Visualization of translation and protein biogenesis at the ER membrane.
Authors: 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 ...Authors: 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 /
Abstract: 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.
History
DepositionSep 27, 2022-
Header (metadata) releaseDec 7, 2022-
Map releaseDec 7, 2022-
UpdateFeb 8, 2023-
Current statusFeb 8, 2023Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_15893.png

Downloads & links

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Map

FileDownload / File: emd_15893.map.gz / Format: CCP4 / Size: 476.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 500 pix.
= 499.5 Å		1 Å/pix.
x 500 pix.
= 499.5 Å		1 Å/pix.
x 500 pix.
= 499.5 Å

Surface

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.999 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.014
Minimum - Maximum-0.055100124 - 0.22381635
Average (Standard dev.)0.0011084084 (±0.0070034727)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions500500500
Spacing500500500
CellA=B=C: 499.5 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_15893_half_map_1.map
Projections & Slices
AxesZYX

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Histogram (log scale)

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Half map: #1

Fileemd_15893_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : Ribosome in the Classical Pre+ state

EntireName: Ribosome in the Classical Pre+ state
Components
  • Complex: Ribosome in the Classical Pre+ state
    • Protein or peptide: Elongation factor 1-alpha 2
    • RNA: 28S ribosomal RNA

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Supramolecule #1: Ribosome in the Classical Pre+ state

SupramoleculeName: Ribosome in the Classical Pre+ state / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Elongation factor 1-alpha 2

MacromoleculeName: Elongation factor 1-alpha 2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: human (human)
Molecular weightTheoretical: 50.545102 KDa
SequenceString: MGKEKTHINI VVIGHVDSGK STTTGHLIYK CGGIDKRTIE KFEKEAAEMG KGSFKYAWVL DKLKAERERG ITIDISLWKF ETTKYYITI IDAPGHRDFI KNMITGTSQA DCAVLIVAAG VGEFEAGISK NGQTREHALL AYTLGVKQLI VGVNKMDSTE P AYSEKRYD ...String:
MGKEKTHINI VVIGHVDSGK STTTGHLIYK CGGIDKRTIE KFEKEAAEMG KGSFKYAWVL DKLKAERERG ITIDISLWKF ETTKYYITI IDAPGHRDFI KNMITGTSQA DCAVLIVAAG VGEFEAGISK NGQTREHALL AYTLGVKQLI VGVNKMDSTE P AYSEKRYD EIVKEVSAYI KKIGYNPATV PFVPISGWHG DNMLEPSPNM PWFKGWKVER KEGNASGVSL LEALDTILPP TR PTDKPLR LPLQDVYKIG GIGTVPVGRV ETGILRPGMV VTFAPVNITT EVKSVEMHHE ALSEALPGDN VGFNVKNVSV KDI RRGNVC GDSKSDPPQE AAQFTSQVII LNHPGQISAG YSPVIDCHTA HIACKFAELK EKIDRRSGKK LEDNPKSLKS GDAA IVEMV PGKPMCVESF SQYPPLGRFA VRDMRQTVAV GVIKNVEKKS GGAGKVTKSA QKAQKAGK

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Macromolecule #2: 28S ribosomal RNA

MacromoleculeName: 28S ribosomal RNA / type: rna / ID: 2 / Number of copies: 1
Source (natural)Organism: human (human)
Molecular weightTheoretical: 1.640222125 MDa
SequenceString: CGCGACCUCA GAUCAGACGU GGCGACCCGC UGAAUUUAAG CAUAUUAGUC AGCGGAGGAG AAGAAACUAA CCAGGAUUCC CUCAGUAAC GGCGAGUGAA CAGGGAAGAG CCCAGCGCCG AAUCCCCGCC CCGCGGCGGG GCGCGGGACA UGUGGCGUAC G GAAGACCC ...String:
CGCGACCUCA GAUCAGACGU GGCGACCCGC UGAAUUUAAG CAUAUUAGUC AGCGGAGGAG AAGAAACUAA CCAGGAUUCC CUCAGUAAC GGCGAGUGAA CAGGGAAGAG CCCAGCGCCG AAUCCCCGCC CCGCGGCGGG GCGCGGGACA UGUGGCGUAC G GAAGACCC GCUCCCCGGC GCCGCUCGUG GGGGGCCCAA GUCCUUCUGA UCGAGGCCCA GCCCGUGGAC GGUGUGAGGC CG GUAGCGG CCCCCGGCGC GCCGGGCCCG GGUCUUCCCG GAGUCGGGUU GCUUGGGAAU GCAGCCCAAA GCGGGUGGUA AAC UCCAUC UAAGGCUAAA UACCGGCACG AGACCGAUAG UCAACAAGUA CCGUAAGGGA AAGUUGAAAA GAACUUUGAA GAGA GAGUU CAAGAGGGCG UGAAACCGUU AAGAGGUAAA CGGGUGGGGU CCGCGCAGUC CGCCCGGAGG AUUCAACCCG GCGGC GGGU CCGGCCGUGU CGGCGGCCCG GCGGAUCUUU CCCGCCCCCC GUUCCUCCCG ACCCCUCCAC CCGCCCUCCC UUCCCC CGC CGCCCCUCCU CCUCCUCCCC GGAGGGGGCG GGCUCCGGCG GGUGCGGGGG UGGGCGGGCG GGGCCGGGGG UGGGGUC GG CGGGGGACCG UCCCCCGACC GGCGACCGGC CGCCGCCGGG CGCAUUUCCA CCGCGGCGGU GCGCCGCGAC CGGCUCCG G GACGGCUGGG AAGGCCCGGC GGGGAAGGUG GCUCGGGGGG CCCCGUCCGU CCGUCCGUCC GUCCUCCUCC UCCCCCGUC UCCGCCCCCC GGCCCCGCGU CCUCCCUCGG GAGGGCGCGC GGGUCGGGGC GGCGGCGGCG GCGGCGGUGG CGGCGGCGGC GGCGGCGGC GGGACCGAAA CCCCCCCCGA GUGUUACAGC CCCCCCGGCA GCAGCACUCG CCGAAUCCCG GGGCCGAGGG A GCGAGACC CGUCGCCGCG CUCUCCCCCC UCCCGGCGCC CACCCCCGCG GGGAAUCCCC CGCGAGGGGG GUCUCCCCCG CG GGGGCGC GCCGGCGUCU CCUCGUGGGG GGGCCGGGCC ACCCCUCCCA CGGCGCGACC GCUCUCCCAC CCCUCCUCCC CGC GCCCCC GCCCCGGCGA CGGGGGGGGU GCCGCGCGCG GGUCGGGGGG CGGGGCGGAC UGUCCCCAGU GCGCCCCGGG CGGG UCGCG CCGUCGGGCC CGGGGGAGGU UCUCUCGGGG CCACGCGCGC GUCCCCCGAA GAGGGGGACG GCGGAGCGAG CGCAC GGGG UCGGCGGCGA CGUCGGCUAC CCACCCGACC CGUCUUGAAA CACGGACCAA GGAGUCUAAC ACGUGCGCGA GUCGGG GGC UCGCACGAAA GCCGCCGUGG CGCAAUGAAG GUGAAGGCCG GCGCGCUCGC CGGCCGAGGU GGGAUCCCGA GGCCUCU CC AGUCCGCCGA GGGCGCACCA CCGGCCCGUC UCGCCCGCCG CGCCGGGGAG GUGGAGCACG AGCGCACGUG UUAGGACC C GAAAGAUGGU GAACUAUGCC UGGGCAGGGC GAAGCCAGAG GAAACUCUGG UGGAGGUCCG UAGCGGUCCU GACGUGCAA AUCGGUCGUC CGACCUGGGU AUAGGGGCGA AAGACUAAUC GAACCAUCUA GUAGCUGGUU CCCUCCGAAG UUUCCCUCAG GAUAGCUGG CGCUCUCGCA GACCCGACGC ACCCCCGCCA CGCAGUUUUA UCCGGUAAAG CGAAUGAUUA GAGGUCUUGG G GCCGAAAC GAUCUCAACC UAUUCUCAAA CUUUAAAUGG GUAAGAAGCC CGGCUCGCUG GCGUGGAGCC GGGCGUGGAA UG CGAGUGC CUAGUGGGCC ACUUUUGGUA AGCAGAACUG GCGCUGCGGG AUGAACCGAA CGCCGGGUUA AGGCGCCCGA UGC CGACGC UCAUCAGACC CCAGAAAAGG UGUUGGUUGA UAUAGACAGC AGGACGGUGG CCAUGGAAGU CGGAAUCCGC UAAG GAGUG UGUAACAACU CACCUGCCGA AUCAACUAGC CCUGAAAAUG GAUGGCGCUG GAGCGUCGGG CCCAUACCCG GCCGU CGCC GGCAGUCGAG AGUGGACGGG AGCGGCGGGG GCGGCGCGCG CGCGCGCGCG UGUGGUGUGC GUCGGAGGGC GGCGGC GGC GGCGGCGGCG GGGGUGUGGG GUCCUUCCCC CGCCCCCCCC CCCACGCCUC CUCCCCUCCU CCCGCCCACG CCCCGCU CC CCGCCCCCGG AGCCCCGCGG ACGCUACGCC GCGACGAGUA GGAGGGCCGC UGCGGUGAGC CUUGAAGCCU AGGGCGCG G GCCCGGGUGG AGCCGCCGCA GGUGCAGAUC UUGGUGGUAG UAGCAAAUAU UCAAACGAGA ACUUUGAAGG CCGAAGUGG AGAAGGGUUC CAUGUGAACA GCAGUUGAAC AUGGGUCAGU CGGUCCUGAG AGAUGGGCGA GCGCCGUUCC GAAGGGACGG GCGAUGGCC UCCGUUGCCC UCGGCCGAUC GAAAGGGAGU CGGGUUCAGA UCCCCGAAUC CGGAGUGGCG GAGAUGGGCG C CGCGAGGC GUCCAGUGCG GUAACGCGAC CGAUCCCGGA GAAGCCGGCG GGAGCCCCGG GGAGAGUUCU CUUUUCUUUG UG AAGGGCA GGGCGCCCUG GAAUGGGUUC GCCCCGAGAG AGGGGCCCGU GCCUUGGAAA GCGUCGCGGU UCCGGCGGCG UCC GGUGAG CUCUCGCUGG CCCUUGAAAA UCCGGGGGAG AGGGUGUAAA UCUCGCGCCG GGCCGUACCC AUAUCCGCAG CAGG UCUCC AAGGUGAACA GCCUCUGGCA UGUUGGAACA AUGUAGGUAA GGGAAGUCGG CAAGCCGGAU CCGUAACUUC GGGAU AAGG AUUGGCUCUA AGGGCUGGGU CGGUCGGGCU GGGGCGCGAA GCGGGGCUGG GCGCGCGCCG CGGCUGGACG AGGCGC CGC CGCCCCCCCC ACGCCCGGGG CACCCCCCUC GCGGCCCUCC CCCGCCCCAC CCCGCGCGCG CCGCUCGCUC CCUCCCC GC CCCGCGCCCU CUCUCUCUCU CUCUCCCCCG CUCCCCGUCC UCCCCCCUCC CCGGGGGAGC GCCGCGUGGG GGCGGCGG C GGGGGGAGAA GGGUCGGGGC GGCAGGGGCC GGCGGCGGCC CGCCGCGGGG CCCCGGCGGC GGGGGCACGG UCCCCCGCG AGGGGGGCCC GGGCACCCGG GGGGCCGGCG GCGGCGGCGA CUCUGGACGC GAGCCGGGCC CUUCCCGUGG AUCGCCCCAG CUGCGGCGG GCGUCGCGGC CGCCCCCGGG GAGCCCGGCG GGCGCCGGCG CGCCCCCCCC CCCACCCCAC GUCUCGUCGC G CGCGCGUC CGCUGGGGGC GGGGAGCGGU CGGGCGGCGG CGGUCGGCGG GCGGCGGGGC GGGGCGGUUC GUCCCCCCGC CC UACCCCC CCGGCCCCGU CCGCCCCCCG UUCCCCCCUC CUCCUCGGCG CGCGGCGGCG GCGGCGGCAG GCGGCGGAGG GGC CGCGGG CCGGUCCCCC CCGCCGGGUC CGCCCCCGGG GCCGCGGUUC CGCGCGGCGC CUCGCCUCGG CCGGCGCCUA GCAG CCGAC UUAGAACUGG UGCGGACCAG GGGAAUCCGA CUGUUUAAUU AAAACAAAGC AUCGCGAAGG CCCGCGGCGG GUGUU GACG CGAUGUGAUU UCUGCCCAGU GCUCUGAAUG UCAAAGUGAA GAAAUUCAAU GAAGCGCGGG UAAACGGCGG GAGUAA CUA UGACUCUCUU AAGGUAGCCA AAUGCCUCGU CAUCUAAUUA GUGACGCGCA UGAAUGGAUG AACGAGAUUC CCACUGU CC CUACCUACUA UCCAGCGAAA CCACAGCCAA GGGAACGGGC UUGGCGGAAU CAGCGGGGAA AGAAGACCCU GUUGAGCU U GACUCUAGUC UGGCACGGUG AAGAGACAUG AGAGGUGUAG AAUAAGUGGG AGGCCCCCGG CGCCCCCCCG GUGUCCCCG CGAGGGGCCC GGGGCGGGGU CCGCCGGCCC UGCGGGCCGC CGGUGAAAUA CCACUACUCU GAUCGUUUUU UCACUGACCC GGUGAGGCG GGGGGGCGAG CCCCGAGGGG CUCUCGCUUC UGGCGCCAAG CGCCCGGCCG CGCGCCGGCC GGGCGCGACC C GCUCCGGG GACAGUGCCA GGUGGGGAGU UUGACUGGGG CGGUACACCU GUCAAACGGU AACGCAGGUG UCCUAAGGCG AG CUCAGGG AGGACAGAAA CCUCCCGUGG AGCAGAAGGG CAAAAGCUCG CUUGAUCUUG AUUUUCAGUA CGAAUACAGA CCG UGAAAG CGGGGCCUCA CGAUCCUUCU GACCUUUUGG GUUUUAAGCA GGAGGUGUCA GAAAAGUUAC CACAGGGAUA ACUG GCUUG UGGCGGCCAA GCGUUCAUAG CGACGUCGCU UUUUGAUCCU UCGAUGUCGG CUCUUCCUAU CAUUGUGAAG CAGAA UUCA CCAAGCGUUG GAUUGUUCAC CCACUAAUAG GGAACGUGAG CUGGGUUUAG ACCGUCGUGA GACAGGUUAG UUUUAC CCU ACUGAUGAUG UGUUGUUGCC AUGGUAAUCC UGCUCAGUAC GAGAGGAACC GCAGGUUCAG ACAUUUGGUG UAUGUGC UU GGCUGAGGAG CCAAUGGGGC GAAGCUACCA UCUGUGGGAU UAUGACUGAA CGCCUCUAAG UCAGAAUCCC GCCCAGGC G GAACGAUACG GCAGCGCCGC GGAGCCUCGG UUGGCCUCGG AUAGCCGGUC CCCCGCCUGU CCCCGCCGGC GGGCCGCCC CCCCCCUCCA CGCGCCCCGC GCGCGCGGGA GGGCGCGUGC CCCGCCGCGC GCCGGGACCG GGGUCCGGUG CGGAGUGCCC UUCGUCCUG GGAAACGGGG CGCGGCCGGA GAGGCGGCCG CCCCCUCGCC CGUCACGCAC CGCACGUUCG UGGGGAACCU G GCGCUAAA CCAUUCGUAG ACGACCUGCU UCUGGGUCGG GGUUUCGUAC GUAGCAGAGC AGCUCCCUCG CUGCGAUCUA UU GAAAGUC AGCCCUCGAC ACAAGGGUUU GUC

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
GridModel: Quantifoil R3.5/1 / Material: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.2 µm
Sample stageCooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationSoftware - Name: RELION
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 19046

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