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- EMDB-38243: SARS-CoV-2 Replication-Transcription Complex has a dimer-of-dimer... -

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Basic information

Entry
Database: EMDB / ID: EMD-38243
TitleSARS-CoV-2 Replication-Transcription Complex has a dimer-of-dimeric architecture (ddRTC) in pre-capping initiation.
Map data
Sample
  • Complex: E-RCT tetramer
    • Protein or peptide: Replicase polyprotein 1ab
    • Protein or peptide: Non-structural protein 8
    • Protein or peptide: Non-structural protein 7
    • Protein or peptide: Helicase
    • RNA: RNA (39-MER)
    • RNA: RNA (39-MER)
  • Ligand: ZINC ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHATE ION
KeywordsSARS-CoV-2 / Replication-Transcription Complex / helicase / RNA unwinding / cryo-EM / VIRAL PROTEIN
Function / homology
Function and homology information


viral genome replication / methyltransferase activity / protein guanylyltransferase activity / RNA endonuclease activity producing 3'-phosphomonoesters, hydrolytic mechanism / mRNA guanylyltransferase activity / 5'-3' RNA helicase activity / Lyases; Phosphorus-oxygen lyases / Assembly of the SARS-CoV-2 Replication-Transcription Complex (RTC) / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of TBK1 activity / Maturation of replicase proteins ...viral genome replication / methyltransferase activity / protein guanylyltransferase activity / RNA endonuclease activity producing 3'-phosphomonoesters, hydrolytic mechanism / mRNA guanylyltransferase activity / 5'-3' RNA helicase activity / Lyases; Phosphorus-oxygen lyases / Assembly of the SARS-CoV-2 Replication-Transcription Complex (RTC) / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of TBK1 activity / Maturation of replicase proteins / ISG15-specific peptidase activity / TRAF3-dependent IRF activation pathway / Transcription of SARS-CoV-2 sgRNAs / Translation of Replicase and Assembly of the Replication Transcription Complex / snRNP Assembly / Replication of the SARS-CoV-2 genome / Hydrolases; Acting on ester bonds; Exoribonucleases producing 5'-phosphomonoesters / double membrane vesicle viral factory outer membrane / host cell endoplasmic reticulum-Golgi intermediate compartment / SARS coronavirus main proteinase / 5'-3' DNA helicase activity / 3'-5'-RNA exonuclease activity / host cell endosome / symbiont-mediated degradation of host mRNA / mRNA guanylyltransferase / symbiont-mediated suppression of host ISG15-protein conjugation / endonuclease activity / G-quadruplex RNA binding / symbiont-mediated suppression of host toll-like receptor signaling pathway / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of IRF3 activity / omega peptidase activity / mRNA (guanine-N7)-methyltransferase / SARS-CoV-2 modulates host translation machinery / methyltransferase cap1 / methylation / host cell Golgi apparatus / symbiont-mediated suppression of host NF-kappaB cascade / symbiont-mediated perturbation of host ubiquitin-like protein modification / DNA helicase / methyltransferase cap1 activity / ubiquitinyl hydrolase 1 / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / cysteine-type deubiquitinase activity / Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases / single-stranded RNA binding / host cell perinuclear region of cytoplasm / regulation of autophagy / viral protein processing / lyase activity / host cell endoplasmic reticulum membrane / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / symbiont-mediated suppression of host gene expression / copper ion binding / viral translational frameshifting / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / cysteine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / lipid binding / DNA-templated transcription / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell nucleus / ATP hydrolysis activity / proteolysis / RNA binding / zinc ion binding / ATP binding / membrane
Similarity search - Function
RNA-dependent RNA polymerase, SARS-CoV-like / Nonstructural protein 14, betacoronavirus / NSP15, NendoU domain, coronavirus / Nonstructural protein 15, middle domain, alpha/betacoronavirus / Nonstructural protein 15, N-terminal domain, alpha/beta-coronavirus / NSP14, guanine-N7-methyltransferase domain, coronavirus / Coronavirus (CoV) guanine-N7-methyltransferase (N7-MTase) domain profile. / Coronavirus (CoV) Nsp15 N-terminal oligomerization domain profile. / NSP12 RNA-dependent RNA polymerase, coronavirus / : ...RNA-dependent RNA polymerase, SARS-CoV-like / Nonstructural protein 14, betacoronavirus / NSP15, NendoU domain, coronavirus / Nonstructural protein 15, middle domain, alpha/betacoronavirus / Nonstructural protein 15, N-terminal domain, alpha/beta-coronavirus / NSP14, guanine-N7-methyltransferase domain, coronavirus / Coronavirus (CoV) guanine-N7-methyltransferase (N7-MTase) domain profile. / Coronavirus (CoV) Nsp15 N-terminal oligomerization domain profile. / NSP12 RNA-dependent RNA polymerase, coronavirus / : / Coronavirus Nsp12 RNA-dependent RNA polymerase (RdRp) domain profile. / Coronavirus Nsp12 Interface domain profile. / : / : / Coronavirus Nonstructural protein 13, 1B domain / Coronavirus Non-structural protein 13, zinc-binding domain / Coronavirus Nonstructural protein 13, stalk domain / Nidovirus 2-O-methyltransferase / Nidovirus 2'-O-methyltransferase (2'-O-MTase) domain profile. / Non-structural protein NSP15, N-terminal domain superfamily, coronavirus / Non-structural protein NSP15, middle domain superfamily / Coronavirus replicase NSP15, N-terminal oligomerization / Nonstructural protein 15, middle domain, coronavirus / Nonstructural protein 13, 1B domain, coronavirus / Coronavirus replicase NSP15, middle domain / Coronavirus replicase NSP15, N-terminal oligomerisation / Nidovirus 3'-5' exoribonuclease domain / Nidovirus 3'-5' exoribonuclease (ExoN) domain profile. / Non-structural protein NSP16, coronavirus-like / Non-structural protein 14, coronavirus / RNA polymerase, N-terminal, coronavirus / Coronavirus 2'-O-methyltransferase / Coronavirus proofreading exoribonuclease / Coronavirus RNA-dependent RNA polymerase, N-terminal / Nonstructural protein 13, zinc-binding domain, coronavirus-like / Coronaviridae zinc-binding (CV ZBD) domain profile. / Arterivirus Nsp11 N-terminal/Coronavirus NSP15 middle domain / Arterivirus Nsp11 N-terminal/coronavirus NSP15 middle (AV-Nsp11N/CoV-Nsp15M) domain profile. / Nidoviral uridylate-specific endoribonuclease (NendoU) domain profile. / Nidovirus RdRp-associated nucleotidyl transferase (NiRAN) domain / Nidovirus RdRp-associated nucleotidyl transferase (NiRAN) domain profile. / Endoribonuclease EndoU-like / NendoU domain, nidovirus / Coronavirus replicase NSP15, uridylate-specific endoribonuclease / : / Lipocalin signature. / DNA2/NAM7 helicase-like, C-terminal / AAA domain / (+) RNA virus helicase core domain / (+)RNA virus helicase core domain profile. / Non-structural protein NSP3, SUD-N (Mac2) domain, betacoronavirus / Sarbecovirus Nsp3c-N domain profile. / Non-structural protein NSP3, N-terminal, betacoronavirus / Polyprotein cleavage domain PL2pro superfamily, betacoronavirus / Non-structural protein NSP3, SUD-N (Mac2) domain superfamily, betacoronavirus / Betacoronavirus SUD-C domain / Betacoronavirus replicase NSP3, N-terminal / NSP1 globular domain superfamily, betacoronavirus / Non-structural protein 2, SARS-CoV-like / Carbamoyl-phosphate synthase subdomain signature 2. / Betacoronavirus Nsp3c-M domain profile. / NSP1, globular domain, betacoronavirus / Non-structural protein NSP3, SUD-M domain, betacoronavirus / Non-structural protein NSP3, SUD-M domain superfamily, betacoronavirus / Betacoronavirus replicase NSP1 / Betacoronavirus single-stranded poly(A) binding domain / NSP1, C-terminal domain, betacoronavirus / : / Betacoronavirus (BetaCoV) Nsp1 C-terminal domain profile. / Betacoronavirus Nsp3e group 2-specific marker (G2M) domain profile. / Betacoronavirus Nsp3c-C domain profile. / Betacoronavirus Nsp3e nucleic acid-binding (NAB) domain profile. / DPUP/SUD, C-terminal, betacoronavirus / Non-structural protein NSP3, nucleic acid-binding domain, betacoronavirus / Non-structural protein NSP3A domain-like superfamily / Non-structural protein NSP3, nucleic acid-binding domain superfamily, betacoronavirus / Non-structural protein 6, betacoronavirus / Betacoronavirus nucleic acid-binding (NAB) / Papain-like viral protease, palm and finger domains, coronavirus / Papain-like protease, N-terminal domain superfamily, coronavirus / Coronavirus replicase NSP2, N-terminal / : / Coronavirus replicase NSP2, C-terminal / Coronavirus (CoV) Nsp2 middle domain profile. / NSP1, globular domain, alpha/betacoronavirus / Coronavirus (CoV) Nsp1 globular domain profile. / Coronavirus (CoV) Nsp2 N-terminal domain profile. / Coronavirus (CoV) Nsp2 C-terminal domain profile. / Nonstructural protein 2, N-terminal domain, coronavirus / Non-structural protein 2, C-terminal domain, coronavirus / NSP3, second ubiquitin-like (Ubl) domain, coronavirus / Coronavirus Nsp3a Ubl domain profile. / Coronavirus Nsp3d Ubl domain profile. / NSP3, first ubiquitin-like (Ubl) domain, coronavirus / Peptidase family C16 domain profile. / : / : / Coronavirus replicase NSP7 / Coronavirus 3Ecto domain profile. / Coronavirus RNA-dependent RNA polymerase (RdRp) Nsp7 cofactor domain profile.
Similarity search - Domain/homology
Replicase polyprotein 1a / Replicase polyprotein 1ab
Similarity search - Component
Biological speciesSevere acute respiratory syndrome coronavirus 2 / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsYan L / Lou Z
Funding support China, 3 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2024YFC2607300 China
National Natural Science Foundation of China (NSFC)32371258 China
National Natural Science Foundation of China (NSFC)82341073 China
CitationJournal: To Be Published
Title: Structural basis for template-product RNA duplex unwinding by SARS-CoV-2 helicase
Authors: Yan L / Lou Z
History
DepositionDec 9, 2023-
Header (metadata) releaseJun 11, 2025-
Map releaseJun 11, 2025-
UpdateJun 11, 2025-
Current statusJun 11, 2025Processing site: PDBj / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_38243.map.gz / Format: CCP4 / Size: 343 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.09 Å
Density
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-1.7734338 - 3.3771129
Average (Standard dev.)-0.00061183475 (±0.0772992)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions448448448
Spacing448448448
CellA=B=C: 488.32 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : E-RCT tetramer

EntireName: E-RCT tetramer
Components
  • Complex: E-RCT tetramer
    • Protein or peptide: Replicase polyprotein 1ab
    • Protein or peptide: Non-structural protein 8
    • Protein or peptide: Non-structural protein 7
    • Protein or peptide: Helicase
    • RNA: RNA (39-MER)
    • RNA: RNA (39-MER)
  • Ligand: ZINC ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHATE ION

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Supramolecule #1: E-RCT tetramer

SupramoleculeName: E-RCT tetramer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2

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Macromolecule #1: Replicase polyprotein 1ab

MacromoleculeName: Replicase polyprotein 1ab / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: ubiquitinyl hydrolase 1
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 108.162461 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: SADAQSFLNR VCGVSAARLT PCGTGTSTDV VYRAFDIYND KVAGFAKFLK TNCCRFQEKD EDDNLIDSYF VVKRHTFSNY QHEETIYNL LKDCPAVAKH DFFKFRIDGD MVPHISRQRL TKYTMADLVY ALRHFDEGNC DTLKEILVTY NCCDDDYFNK K DWYDFVEN ...String:
SADAQSFLNR VCGVSAARLT PCGTGTSTDV VYRAFDIYND KVAGFAKFLK TNCCRFQEKD EDDNLIDSYF VVKRHTFSNY QHEETIYNL LKDCPAVAKH DFFKFRIDGD MVPHISRQRL TKYTMADLVY ALRHFDEGNC DTLKEILVTY NCCDDDYFNK K DWYDFVEN PDILRVYANL GERVRQALLK TVQFCDAMRN AGIVGVLTLD NQDLNGNWYD FGDFIQTTPG SGVPVVDSYY SL LMPILTL TRALTAESHV DTDLTKPYIK WDLLKYDFTE ERLKLFDRYF KYWDQTYHPN CVNCLDDRCI LHCANFNVLF STV FPPTSF GPLVRKIFVD GVPFVVSTGY HFRELGVVHN QDVNLHSSRL SFKELLVYAA DPAMHAASGN LLLDKRTTCF SVAA LTNNV AFQTVKPGNF NKDFYDFAVS KGFFKEGSSV ELKHFFFAQD GNAAISDYDY YRYNLPTMCD IRQLLFVVEV VDKYF DCYD GGCINANQVI VNNLDKSAGF PFNKWGKARL YYDSMSYEDQ DALFAYTKRN VIPTITQMNL KYAISAKNRA RTVAGV SIC STMTNRQFHQ KLLKSIAATR GATVVIGTSK FYGGWHNMLK TVYSDVENPH LMGWDYPKCD RAMPNMLRIM ASLVLAR KH TTCCSLSHRF YRLANECAQV LSEMVMCGGS LYVKPGGTSS GDATTAYANS VFNICQAVTA NVNALLSTDG NKIADKYV R NLQHRLYECL YRNRDVDTDF VNEFYAYLRK HFSMMILSDD AVVCFNSTYA SQGLVASIKN FKSVLYYQNN VFMSEAKCW TETDLTKGPH EFCSQHTMLV KQGDDYVYLP YPDPSRILGA GCFVDDIVKT DGTLMIERFV SLAIDAYPLT KHPNQEYADV FHLYLQYIR KLHDELTGHM LDMYSVMLTN DNTSRYWEPE FYEAMYTPHT VLQHHHHHHH HHH

UniProtKB: Replicase polyprotein 1ab

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Macromolecule #2: Non-structural protein 8

MacromoleculeName: Non-structural protein 8 / type: protein_or_peptide / ID: 2 / Number of copies: 8 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 21.903047 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AIASEFSSLP SYAAFATAQE AYEQAVANGD SEVVLKKLKK SLNVAKSEFD RDAAMQRKLE KMADQAMTQM YKQARSEDKR AKVTSAMQT MLFTMLRKLD NDALNNIINN ARDGCVPLNI IPLTTAAKLM VVIPDYNTYK NTCDGTTFTY ASALWEIQQV V DADSKIVQ ...String:
AIASEFSSLP SYAAFATAQE AYEQAVANGD SEVVLKKLKK SLNVAKSEFD RDAAMQRKLE KMADQAMTQM YKQARSEDKR AKVTSAMQT MLFTMLRKLD NDALNNIINN ARDGCVPLNI IPLTTAAKLM VVIPDYNTYK NTCDGTTFTY ASALWEIQQV V DADSKIVQ LSEISMDNSP NLAWPLIVTA LRANSAVKLQ

UniProtKB: Replicase polyprotein 1ab

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Macromolecule #3: Non-structural protein 7

MacromoleculeName: Non-structural protein 7 / type: protein_or_peptide / ID: 3 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 9.248804 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
SKMSDVKCTS VVLLSVLQQL RVESSSKLWA QCVQLHNDIL LAKDTTEAFE KMVSLLSVLL SMQGAVDINK LCEEMLDNRA TLQ

UniProtKB: Replicase polyprotein 1a

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Macromolecule #4: Helicase

MacromoleculeName: Helicase / type: protein_or_peptide / ID: 4 / Number of copies: 8 / Enantiomer: LEVO
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Molecular weightTheoretical: 66.930531 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: AVGACVLCNS QTSLRCGACI RRPFLCCKCC YDHVISTSHK LVLSVNPYVC NAPGCDVTDV TQLYLGGMSY YCKSHKPPIS FPLCANGQV FGLYKNTCVG SDNVTDFNAI ATCDWTNAGD YILANTCTER LKLFAAETLK ATEETFKLSY GIATVREVLS D RELHLSWE ...String:
AVGACVLCNS QTSLRCGACI RRPFLCCKCC YDHVISTSHK LVLSVNPYVC NAPGCDVTDV TQLYLGGMSY YCKSHKPPIS FPLCANGQV FGLYKNTCVG SDNVTDFNAI ATCDWTNAGD YILANTCTER LKLFAAETLK ATEETFKLSY GIATVREVLS D RELHLSWE VGKPRPPLNR NYVFTGYRVT KNSKVQIGEY TFEKGDYGDA VVYRGTTTYK LNVGDYFVLT SHTVMPLSAP TL VPQEHYV RITGLYPTLN ISDEFSSNVA NYQKVGMQKY STLQGPPGTG KSHFAIGLAL YYPSARIVYT ACSHAAVDAL CEK ALKYLP IDKCSRIIPA RARVECFDKF KVNSTLEQYV FCTVNALPET TADIVVFDEI SMATNYDLSV VNARLRAKHY VYIG DPAQL PAPRTLLTKG TLEPEYFNSV CRLMKTIGPD MFLGTCRRCP AEIVDTVSAL VYDNKLKAHK DKSAQCFKMF YKGVI THDV SSAINRPQIG VVREFLTRNP AWRKAVFISP YNSQNAVASK ILGLPTQTVD SSQGSEYDYV IFTQTTETAH SCNVNR FNV AITRAKVGIL CIMSDRDLYD KLQFTSLEIP RRNVATLQ

UniProtKB: Replicase polyprotein 1ab

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Macromolecule #5: RNA (39-MER)

MacromoleculeName: RNA (39-MER) / type: rna / ID: 5 / Number of copies: 4
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 12.688619 KDa
SequenceString:
CAUGGGAAAU GCUACGCGGU AGUAGCAUGC UAGGAGCAG

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Macromolecule #6: RNA (39-MER)

MacromoleculeName: RNA (39-MER) / type: rna / ID: 6 / Number of copies: 4
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 12.316291 KDa
SequenceString:
CUGCUCCUAG CAUGCUACUA CCGCGUAGCA UUUCCCAUG

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Macromolecule #7: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 7 / Number of copies: 32 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #8: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 8 / Number of copies: 2 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

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Macromolecule #9: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 9 / Number of copies: 2 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #10: PHOSPHATE ION

MacromoleculeName: PHOSPHATE ION / type: ligand / ID: 10 / Number of copies: 1 / Formula: PO4
Molecular weightTheoretical: 94.971 Da
Chemical component information

ChemComp-PO4:
PHOSPHATE ION

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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
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 5.0 µm / Nominal defocus min: 1.2 µm
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: PDB ENTRY
PDB model - PDB ID:

7cyq

Final reconstructionNumber classes used: 155382 / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 213540
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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