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- EMDB-0664: Electron cryo-microscopy of the eukaryotic translation initiation... -

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Basic information

Entry
Database: EMDB / ID: EMD-0664
TitleElectron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to eukaryotic translation initiation factor 2 from Homo sapiens
Map dataeIF2 alpha phosphorylated at serine 51 bound to eIF2B.
Sample
  • Organelle or cellular component: eIF2 Alpha-P bound to eIF2B
    • Protein or peptide: Translation initiation factor eIF-2B subunit epsilon
    • Protein or peptide: Translation initiation factor eIF-2B subunit beta
    • Protein or peptide: Translation initiation factor eIF-2B subunit delta
    • Protein or peptide: Translation initiation factor eIF-2B subunit alpha
    • Protein or peptide: Translation initiation factor eIF-2B subunit gamma
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1
Keywordseukaryotic translation initiation factor 2B / eukaryotic translation initiation factor 2 / TRANSLATION
Function / homology
Function and homology information


translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / response to kainic acid / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency ...translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / response to kainic acid / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / negative regulation of translational initiation in response to stress / PERK-mediated unfolded protein response / PERK regulates gene expression / eukaryotic translation initiation factor 2 complex / cytoplasmic translational initiation / regulation of translational initiation in response to stress / guanyl-nucleotide exchange factor complex / astrocyte development / oligodendrocyte development / eukaryotic 48S preinitiation complex / astrocyte differentiation / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / Translation initiation complex formation / positive regulation of translational initiation / Response of EIF2AK4 (GCN2) to amino acid deficiency / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / response to glucose / mitophagy / ovarian follicle development / translation initiation factor binding / translation initiation factor activity / myelination / stress granule assembly / cellular response to amino acid starvation / response to endoplasmic reticulum stress / guanyl-nucleotide exchange factor activity / hippocampus development / central nervous system development / translational initiation / PKR-mediated signaling / ABC-family proteins mediated transport / response to peptide hormone / cytoplasmic stress granule / cellular response to UV / regulation of translation / T cell receptor signaling pathway / ribosome binding / cellular response to heat / response to heat / cellular response to oxidative stress / positive regulation of apoptotic process / synapse / GTP binding / mitochondrion / RNA binding / extracellular exosome / ATP binding / identical protein binding / nucleus / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Translation initiation factor eIF-2B subunit alpha, N-terminal / : / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / Initiation factor 2B-related / Initiation factor 2B-like, C-terminal / Initiation factor 2 subunit family ...Translation initiation factor eIF-2B subunit alpha, N-terminal / : / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / Initiation factor 2B-related / Initiation factor 2B-like, C-terminal / Initiation factor 2 subunit family / eIF4-gamma/eIF5/eIF2-epsilon / Domain at the C-termini of GCD6, eIF-2B epsilon, eIF-4 gamma and eIF-5 / W2 domain / W2 domain profile. / Translation initiation factor 2, alpha subunit / Translation initiation factor 2, alpha subunit, middle domain superfamily / Translation initiation factor 2, alpha subunit, C-terminal / IF2a, S1-like domain / Eukaryotic translation initiation factor 2 alpha subunit / Nucleotidyl transferase domain / Nucleotidyl transferase / NagB/RpiA transferase-like / Trimeric LpxA-like superfamily / S1 domain profile. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / Nucleotide-diphospho-sugar transferases / Armadillo-type fold / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
Eukaryotic translation initiation factor 2 subunit 1 / Translation initiation factor eIF2B subunit beta / Translation initiation factor eIF2B subunit epsilon / Translation initiation factor eIF2B subunit alpha / Translation initiation factor eIF2B subunit gamma / Translation initiation factor eIF2B subunit delta
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.03 Å
AuthorsNguyen HC / Kenner LR
Funding support United States, 1 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI)55108523 United States
CitationJournal: Science / Year: 2019
Title: eIF2B-catalyzed nucleotide exchange and phosphoregulation by the integrated stress response.
Authors: Lillian R Kenner / Aditya A Anand / Henry C Nguyen / Alexander G Myasnikov / Carolin J Klose / Lea A McGeever / Jordan C Tsai / Lakshmi E Miller-Vedam / Peter Walter / Adam Frost /
Abstract: The integrated stress response (ISR) tunes the rate of protein synthesis. Control is exerted by phosphorylation of the general translation initiation factor eIF2. eIF2 is a guanosine triphosphatase ...The integrated stress response (ISR) tunes the rate of protein synthesis. Control is exerted by phosphorylation of the general translation initiation factor eIF2. eIF2 is a guanosine triphosphatase that becomes activated by eIF2B, a two-fold symmetric and heterodecameric complex that functions as eIF2's dedicated nucleotide exchange factor. Phosphorylation converts eIF2 from a substrate into an inhibitor of eIF2B. We report cryo-electron microscopy structures of eIF2 bound to eIF2B in the dephosphorylated state. The structures reveal that the eIF2B decamer is a static platform upon which one or two flexible eIF2 trimers bind and align with eIF2B's bipartite catalytic centers to catalyze nucleotide exchange. Phosphorylation refolds eIF2α, allowing it to contact eIF2B at a different interface and, we surmise, thereby sequestering it into a nonproductive complex.
History
DepositionMar 15, 2019-
Header (metadata) releaseMay 15, 2019-
Map releaseMay 15, 2019-
UpdateMay 21, 2025-
Current statusMay 21, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 3
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 3
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6o9z
  • Surface level: 3
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0664.png

Downloads & links

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Map

FileDownload / File: emd_0664.map.gz / Format: CCP4 / Size: 166.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationeIF2 alpha phosphorylated at serine 51 bound to eIF2B.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 352 pix.
= 289.344 Å		0.82 Å/pix.
x 352 pix.
= 289.344 Å		0.82 Å/pix.
x 352 pix.
= 289.344 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.822 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.9 / Movie #1: 3
Minimum - Maximum-8.685509 - 14.365423
Average (Standard dev.)-0.010631724 (±0.78712493)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions352352352
Spacing352352352
CellA=B=C: 289.344 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8220.8220.822
M x/y/z352352352
origin x/y/z0.0000.0000.000
length x/y/z289.344289.344289.344
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS352352352
D min/max/mean-8.68614.365-0.011

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Supplemental data

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Sample components

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Entire : eIF2 Alpha-P bound to eIF2B

EntireName: eIF2 Alpha-P bound to eIF2B
Components
  • Organelle or cellular component: eIF2 Alpha-P bound to eIF2B
    • Protein or peptide: Translation initiation factor eIF-2B subunit epsilon
    • Protein or peptide: Translation initiation factor eIF-2B subunit beta
    • Protein or peptide: Translation initiation factor eIF-2B subunit delta
    • Protein or peptide: Translation initiation factor eIF-2B subunit alpha
    • Protein or peptide: Translation initiation factor eIF-2B subunit gamma
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1

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Supramolecule #1: eIF2 Alpha-P bound to eIF2B

SupramoleculeName: eIF2 Alpha-P bound to eIF2B / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Translation initiation factor eIF-2B subunit epsilon

MacromoleculeName: Translation initiation factor eIF-2B subunit epsilon / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 80.452586 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAAPVVAPPG VVVSRANKRS GAGPGGSGGG GARGAEEEPP PPLQAVLVAD SFDRRFFPIS KDQPRVLLPL ANVALIDYTL EFLTATGVQ ETFVFCCWKA AQIKEHLLKS KWCRPTSLNV VRIITSELYR SLGDVLRDVD AKALVRSDFL LVYGDVISNI N ITRALEEH ...String:
MAAPVVAPPG VVVSRANKRS GAGPGGSGGG GARGAEEEPP PPLQAVLVAD SFDRRFFPIS KDQPRVLLPL ANVALIDYTL EFLTATGVQ ETFVFCCWKA AQIKEHLLKS KWCRPTSLNV VRIITSELYR SLGDVLRDVD AKALVRSDFL LVYGDVISNI N ITRALEEH RLRRKLEKNV SVMTMIFKES SPSHPTRCHE DNVVVAVDST TNRVLHFQKT QGLRRFAFPL SLFQGSSDGV EV RYDLLDC HISICSPQVA QLFTDNFDYQ TRDDFVRGLL VNEEILGNQI HMHVTAKEYG ARVSNLHMYS AVCADVIRRW VYP LTPEAN FTDSTTQSCT HSRHNIYRGP EVSLGHGSIL EENVLLGSGT VIGSNCFITN SVIGPGCHIG DNVVLDQTYL WQGV RVAAG AQIHQSLLCD NAEVKERVTL KPRSVLTSQV VVGPNITLPE GSVISLHPPD AEEDEDDGEF SDDSGADQEK DKVKM KGYN PAEVGAAGKG YLWKAAGMNM EEEEELQQNL WGLKINMEEE SESESEQSMD SEEPDSRGGS PQMDDIKVFQ NEVLGT LQR GKEENISCDN LVLEINSLKY AYNVSLKEVM QVLSHVVLEF PLQQMDSPLD SSRYCALLLP LLKAWSPVFR NYIKRAA DH LEALAAIEDF FLEHEALGIS MAKVLMAFYQ LEILAEETIL SWFSQRDTTD KGQQLRKNQQ LQRFIQWLKE AEEESSED D

UniProtKB: Translation initiation factor eIF2B subunit epsilon

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Macromolecule #2: Translation initiation factor eIF-2B subunit beta

MacromoleculeName: Translation initiation factor eIF-2B subunit beta / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.008578 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MHHHHHHGGG SENLYFQSPG SAAKGSELSE RIESFVETLK RGGGPRSSEE MARETLGLLR QIITDHRWSN AGELMELIRR EGRRMTAAQ PSETTVGNMV RRVLKIIREE YGRLHGRSDE SDQQESLHKL LTSGGLNEDF SFHYAQLQSN IIEAINELLV E LEGTMENI ...String:
MHHHHHHGGG SENLYFQSPG SAAKGSELSE RIESFVETLK RGGGPRSSEE MARETLGLLR QIITDHRWSN AGELMELIRR EGRRMTAAQ PSETTVGNMV RRVLKIIREE YGRLHGRSDE SDQQESLHKL LTSGGLNEDF SFHYAQLQSN IIEAINELLV E LEGTMENI AAQALEHIHS NEVIMTIGFS RTVEAFLKEA ARKRKFHVIV AECAPFCQGH EMAVNLSKAG IETTVMTDAA IF AVMSRVN KVIIGTKTIL ANGALRAVTG THTLALAAKH HSTPLIVCAP MFKLSPQFPN EEDSFHKFVA PEEVLPFTEG DIL EKVSVH CPVFDYVPPE LITLFISNIG GNAPSYIYRL MSELYHPDDH VL

UniProtKB: Translation initiation factor eIF2B subunit beta

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Macromolecule #3: Translation initiation factor eIF-2B subunit delta

MacromoleculeName: Translation initiation factor eIF-2B subunit delta / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 57.640168 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAAVAVAVRE DSGSGMKAEL PPGPGAVGRE MTKEEKLQLR KEKKQQKKKR KEEKGAEPET GSAVSAAQCQ VGPTRELPES GIQLGTPRE KVPAGRSKAE LRAERRAKQE AERALKQARK GEQGGPPPKA SPSTAGETPS GVKRLPEYPQ VDDLLLRRLV K KPERQQVP ...String:
MAAVAVAVRE DSGSGMKAEL PPGPGAVGRE MTKEEKLQLR KEKKQQKKKR KEEKGAEPET GSAVSAAQCQ VGPTRELPES GIQLGTPRE KVPAGRSKAE LRAERRAKQE AERALKQARK GEQGGPPPKA SPSTAGETPS GVKRLPEYPQ VDDLLLRRLV K KPERQQVP TRKDYGSKVS LFSHLPQYSR QNSLTQFMSI PSSVIHPAMV RLGLQYSQGL VSGSNARCIA LLRALQQVIQ DY TTPPNEE LSRDLVNKLK PYMSFLTQCR PLSASMHNAI KFLNKEITSV GSSKREEEAK SELRAAIDRY VQEKIVLAAQ AIS RFAYQK ISNGDVILVY GCSSLVSRIL QEAWTEGRRF RVVVVDSRPW LEGRHTLRSL VHAGVPASYL LIPAASYVLP EVSK VLLGA HALLANGSVM SRVGTAQLAL VARAHNVPVL VCCETYKFCE RVQTDAFVSN ELDDPDDLQC KRGEHVALAN WQNHA SLRL LNLVYDVTPP ELVDLVITEL GMIPCSSVPV VLRVKSSDQ

UniProtKB: Translation initiation factor eIF2B subunit delta

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Macromolecule #4: Translation initiation factor eIF-2B subunit alpha

MacromoleculeName: Translation initiation factor eIF-2B subunit alpha / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 33.754148 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MDDKELIEYF KSQMKEDPDM ASAVAAIRTL LEFLKRDKGE TIQGLRANLT SAIETLCGVD SSVAVSSGGE LFLRFISLAS LEYSDYSKC KKIMIERGEL FLRRISLSRN KIADLCHTFI KDGATILTHA YSRVVLRVLE AAVAAKKRFS VYVTESQPDL S GKKMAKAL ...String:
MDDKELIEYF KSQMKEDPDM ASAVAAIRTL LEFLKRDKGE TIQGLRANLT SAIETLCGVD SSVAVSSGGE LFLRFISLAS LEYSDYSKC KKIMIERGEL FLRRISLSRN KIADLCHTFI KDGATILTHA YSRVVLRVLE AAVAAKKRFS VYVTESQPDL S GKKMAKAL CHLNVPVTVV LDAAVGYIME KADLVIVGAE GVVENGGIIN KIGTNQMAVC AKAQNKPFYV VAESFKFVRL FP LNQQDVP DKFKYKADTL KVAQTGQDLK EEHPWVDYTA PSLITLLFTD LGVLTPSAVS DELIKLYL

UniProtKB: Translation initiation factor eIF2B subunit alpha

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Macromolecule #5: Translation initiation factor eIF-2B subunit gamma

MacromoleculeName: Translation initiation factor eIF-2B subunit gamma / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.30423 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MEFQAVVMAV GGGSRMTDLT SSIPKPLLPV GNKPLIWYPL NLLERVGFEE VIVVTTRDVQ KALCAEFKMK MKPDIVCIPD DADMGTADS LRYIYPKLKT DVLVLSCDLI TDVALHEVVD LFRAYDASLA MLMRKGQDSI EPVPGQKGKK KAVEQRDFIG V DSTGKRLL ...String:
MEFQAVVMAV GGGSRMTDLT SSIPKPLLPV GNKPLIWYPL NLLERVGFEE VIVVTTRDVQ KALCAEFKMK MKPDIVCIPD DADMGTADS LRYIYPKLKT DVLVLSCDLI TDVALHEVVD LFRAYDASLA MLMRKGQDSI EPVPGQKGKK KAVEQRDFIG V DSTGKRLL FMANEADLDE ELVIKGSILQ KHPRIRFHTG LVDAHLYCLK KYIVDFLMEN GSITSIRSEL IPYLVRKQFS SA SSQQGQE EKEEDLKKKE LKSLDIYSFI KEANTLNLAP YDACWNACRG DRWEDLSRSQ VRCYVHIMKE GLCSRVSTLG LYM EANRQV PKLLSALCPE EPPVHSSAQI VSKHLVGVDS LIGPETQIGE KSSIKRSVIG SSCLIKDRVT ITNCLLMNSV TVEE GSNIQ GSVICNNAVI EKGADIKDCL IGSGQRIEAK AKRVNEVIVG NDQLMEI

UniProtKB: Translation initiation factor eIF2B subunit gamma

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Macromolecule #6: Eukaryotic translation initiation factor 2 subunit 1

MacromoleculeName: Eukaryotic translation initiation factor 2 subunit 1 / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.238121 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MDYKDDDDKP GLSCRFYQHK FPEVEDVVMV NVRSIAEMGA YVSLLEYNNI EGMILLSEL(SEP) RRRIRSINKL IRIGRN ECV VVIRVDKEKG YIDLSKRRVS PEEAIKCEDK FTKSKTVYSI LRHVAEVLEY TKDEQLESLF QRTAWVFDDK YKRPGYG AY DAFKHAVSDP ...String:
MDYKDDDDKP GLSCRFYQHK FPEVEDVVMV NVRSIAEMGA YVSLLEYNNI EGMILLSEL(SEP) RRRIRSINKL IRIGRN ECV VVIRVDKEKG YIDLSKRRVS PEEAIKCEDK FTKSKTVYSI LRHVAEVLEY TKDEQLESLF QRTAWVFDDK YKRPGYG AY DAFKHAVSDP SILDSLDLNE DEREVLINNI NRRLTPQAVK IRADIEVACY GYEGIDAVKE ALRAGLNCST ENMPIKIN L IAPPRYVMTT TTLERTEGLS VLSQAMAVIK EKIEEKRGVF NVQMEPKVVT DTDETELARQ MERLERENAE VDGDDDAEE MEAKAED

UniProtKB: Eukaryotic translation initiation factor 2 subunit 1

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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
GridDetails: unspecified
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 80.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: Negative Stain 3D reconstruction
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.03 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 34014
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER

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