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- EMDB-52879: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nu... -

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Basic information

Entry
Database: EMDB / ID: EMD-52879
TitleKu70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nucleosome
Map data
Sample
  • Complex: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nucleosome
    • Protein or peptide: X-ray repair cross-complementing protein 6
    • Protein or peptide: X-ray repair cross-complementing protein 5
    • Protein or peptide: Histone H2AX
    • Protein or peptide: Histone H2B type 1-J
    • Protein or peptide: Histone H3.1
    • Protein or peptide: Histone H4
    • DNA: DNA
    • DNA: DNA
KeywordsDNA-binding protein / NHEJ / Ku70/80 / nucleosome / DNA BINDING PROTEIN
Function / homology
Function and homology information


Ku70:Ku80 complex / negative regulation of t-circle formation / DNA end binding / small-subunit processome assembly / positive regulation of lymphocyte differentiation / DNA-dependent protein kinase-DNA ligase 4 complex / nonhomologous end joining complex / cellular response to X-ray / regulation of smooth muscle cell proliferation / double-strand break repair via classical nonhomologous end joining ...Ku70:Ku80 complex / negative regulation of t-circle formation / DNA end binding / small-subunit processome assembly / positive regulation of lymphocyte differentiation / DNA-dependent protein kinase-DNA ligase 4 complex / nonhomologous end joining complex / cellular response to X-ray / regulation of smooth muscle cell proliferation / double-strand break repair via classical nonhomologous end joining / Cytosolic sensors of pathogen-associated DNA / protein localization to site of double-strand break / nuclear telomere cap complex / XY body / IRF3-mediated induction of type I IFN / cellular hyperosmotic salinity response / U3 snoRNA binding / chromatin-protein adaptor activity / regulation of telomere maintenance / recombinational repair / protein localization to chromosome, telomeric region / 2-LTR circle formation / response to ionizing radiation / male germ cell nucleus / telomeric repeat DNA binding / DNA 3'-5' helicase / 5'-deoxyribose-5-phosphate lyase activity / 3'-5' DNA helicase activity / negative regulation of tumor necrosis factor-mediated signaling pathway / ATP-dependent activity, acting on DNA / telomere maintenance via telomerase / DNA damage checkpoint signaling / negative regulation of megakaryocyte differentiation / protein localization to CENP-A containing chromatin / Chromatin modifying enzymes / Replacement of protamines by nucleosomes in the male pronucleus / Packaging Of Telomere Ends / activation of innate immune response / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / replication fork / telomere organization / telomere maintenance / Interleukin-7 signaling / Deposition of new CENPA-containing nucleosomes at the centromere / cyclin binding / positive regulation of DNA repair / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / DNA helicase activity / RNA Polymerase I Promoter Opening / Inhibition of DNA recombination at telomere / DNA-(apurinic or apyrimidinic site) lyase / Assembly of the ORC complex at the origin of replication / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / Meiotic synapsis / SUMOylation of chromatin organization proteins / Regulation of endogenous retroelements by the Human Silencing Hub (HUSH) complex / site of DNA damage / condensed nuclear chromosome / DNA methylation / Condensation of Prophase Chromosomes / Chromatin modifications during the maternal to zygotic transition (MZT) / SIRT1 negatively regulates rRNA expression / HCMV Late Events / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / Regulation of endogenous retroelements by KRAB-ZFP proteins / cellular response to gamma radiation / Defective pyroptosis / HDACs deacetylate histones / small-subunit processome / Transcriptional regulation by small RNAs / lipopolysaccharide binding / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / RNA Polymerase I Promoter Escape / Nonhomologous End-Joining (NHEJ) / epigenetic regulation of gene expression / HDMs demethylate histones / meiotic cell cycle / protein-DNA complex / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / Negative Regulation of CDH1 Gene Transcription / NoRC negatively regulates rRNA expression / G2/M DNA damage checkpoint / PKMTs methylate histone lysines / Formation of the beta-catenin:TCF transactivating complex / double-strand break repair via nonhomologous end joining / B-WICH complex positively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / Meiotic recombination / Pre-NOTCH Transcription and Translation / Activation of anterior HOX genes in hindbrain development during early embryogenesis / enzyme activator activity / Transcriptional regulation of granulopoiesis / nucleosomal DNA binding / RMTs methylate histone arginines / innate immune response in mucosa / HCMV Early Events
Similarity search - Function
Ku70, bridge and pillars domain superfamily / : / Ku70 / Ku, C-terminal / Ku, C-terminal domain superfamily / Ku C terminal domain like / Ku80 / Ku70/Ku80 C-terminal arm / Ku70/Ku80 C-terminal arm / Ku70/Ku80, N-terminal alpha/beta ...Ku70, bridge and pillars domain superfamily / : / Ku70 / Ku, C-terminal / Ku, C-terminal domain superfamily / Ku C terminal domain like / Ku80 / Ku70/Ku80 C-terminal arm / Ku70/Ku80 C-terminal arm / Ku70/Ku80, N-terminal alpha/beta / Ku70/Ku80 N-terminal alpha/beta domain / Ku70/Ku80 beta-barrel domain / Ku70 and Ku80 are 70kDa and 80kDa subunits of the Lupus Ku autoantigen / Ku70/Ku80 beta-barrel domain / SPOC-like, C-terminal domain superfamily / SAP domain superfamily / SAP motif profile. / SAP domain / Putative DNA-binding (bihelical) motif predicted to be involved in chromosomal organisation / SAP domain / von Willebrand factor (vWF) type A domain / von Willebrand factor, type A / von Willebrand factor A-like domain superfamily / : / Histone H2A conserved site / Histone H2A signature. / Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 domain / Histone-fold
Similarity search - Domain/homology
Histone H2B type 1-J / DNA repair protein Ku70 / DNA repair protein Ku80 / Histone H2AX / Histone H4 / Histone H3.1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.39 Å
AuthorsHall C / Chaplin AK
Funding support Canada, United Kingdom, 2 items
OrganizationGrant numberCountry
Medical Research Council (MRC, Canada)MR/X00029X/1 Canada
The Lister Institute of Preventive Medicine United Kingdom
CitationJournal: Nat Commun / Year: 2025
Title: Cryo-EM structures of NHEJ assemblies with nucleosomes.
Authors: Chloe Hall / Philippe Frit / Antonia Kefala-Stavridi / Amandine Pelletier / Steven W Hardwick / Himani Amin / Matthew K Bilyard / Taiana Maia De Oliviera / Ammarah Tariq / Sayma Zahid / ...Authors: Chloe Hall / Philippe Frit / Antonia Kefala-Stavridi / Amandine Pelletier / Steven W Hardwick / Himani Amin / Matthew K Bilyard / Taiana Maia De Oliviera / Ammarah Tariq / Sayma Zahid / Dimitri Y Chirgadze / Shankar Balasubramanian / Katheryn Meek / Virginie Ropars / Jean-Baptiste Charbonnier / Mauro Modesti / Patrick Calsou / Sébastien Britton / Tom L Blundell / Thomas Schalch / Amanda K Chaplin /
Abstract: DNA double-strand breaks (DSBs) are highly deleterious lesions that can trigger cell death or carcinogenesis if unrepaired or misrepaired. In mammals, most DSBs are repaired by non-homologous end ...DNA double-strand breaks (DSBs) are highly deleterious lesions that can trigger cell death or carcinogenesis if unrepaired or misrepaired. In mammals, most DSBs are repaired by non-homologous end joining (NHEJ), which begins when Ku70/80 binds DNA ends and recruits DNA-PKcs to form the DNA-PK holoenzyme. Although recent cryo-EM studies have resolved several NHEJ assemblies, how these factors access DSBs within nucleosomes remains unclear. Here, we present cryo-EM structures of human Ku70/80 and DNA-PK bound to nucleosomes. Ku70/80 binds the DNA end and bends it away from the nucleosome core, while the Ku70 C-terminal SAP domain makes an additional, specific DNA contact. Our DNA-PK-nucleosome structure further reveals the opening of the Ku80 vWA domain, and we show that non-hydrolysable ATP promotes synapsis by stabilising the Ku80-mediated DNA-PK dimer. These structures reveal a model for DSB recognition on nucleosomal DNA and provide insights relevant to targeting NHEJ in cancer therapy.
History
DepositionFeb 21, 2025-
Header (metadata) releaseJan 14, 2026-
Map releaseJan 14, 2026-
UpdateJan 28, 2026-
Current statusJan 28, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_52879.png

Downloads & links

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Map

FileDownload / File: emd_52879.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.824 Å
Density
Contour LevelBy AUTHOR: 0.07
Minimum - Maximum-0.22738594 - 0.503157
Average (Standard dev.)0.000013646754 (±0.012427092)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 421.888 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_52879_additional_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram (log scale)

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Half map: #2

Fileemd_52879_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_52879_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nu...

EntireName: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nucleosome
Components
  • Complex: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nucleosome
    • Protein or peptide: X-ray repair cross-complementing protein 6
    • Protein or peptide: X-ray repair cross-complementing protein 5
    • Protein or peptide: Histone H2AX
    • Protein or peptide: Histone H2B type 1-J
    • Protein or peptide: Histone H3.1
    • Protein or peptide: Histone H4
    • DNA: DNA
    • DNA: DNA

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Supramolecule #1: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nu...

SupramoleculeName: Ku70/80 with Ku70 linker and SAP domain bound to a 153 bp H2AX nucleosome
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 511 KDa

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Macromolecule #1: X-ray repair cross-complementing protein 6

MacromoleculeName: X-ray repair cross-complementing protein 6 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 69.945039 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MSGWESYYKT EGDEEAEEEQ EENLEASGDY KYSGRDSLIF LVDASKAMFE SQSEDELTPF DMSIQCIQSV YISKIISSDR DLLAVVFYG TEKDKNSVNF KNIYVLQELD NPGAKRILEL DQFKGQQGQK RFQDMMGHGS DYSLSEVLWV CANLFSDVQF K MSHKRIML ...String:
MSGWESYYKT EGDEEAEEEQ EENLEASGDY KYSGRDSLIF LVDASKAMFE SQSEDELTPF DMSIQCIQSV YISKIISSDR DLLAVVFYG TEKDKNSVNF KNIYVLQELD NPGAKRILEL DQFKGQQGQK RFQDMMGHGS DYSLSEVLWV CANLFSDVQF K MSHKRIML FTNEDNPHGN DSAKASRART KAGDLRDTGI FLDLMHLKKP GGFDISLFYR DIISIAEDED LRVHFEESSK LE DLLRKVR AKETRKRALS RLKLKLNKDI VISVGIYNLV QKALKPPPIK LYRETNEPVK TKTRTFNTST GGLLLPSDTK RSQ IYGSRQ IILEKEETEE LKRFDDPGLM LMGFKPLVLL KKHHYLRPSL FVYPEESLVI GSSTLFSALL IKCLEKEVAA LCRY TPRRN IPPYFVALVP QEEELDDQKI QVTPPGFQLV FLPFADDKRK MPFTEKIMAT PEQVGKMKAI VEKLRFTYRS DSFEN PVLQ QHFRNLEALA LDLMEPEQAV DLTLPKVEAM NKRLGSLVDE FKELVYPPDY NPEGKVTKRK HDNEGSGSKR PKVEYS EEE LKTHISKGTL GKFTVPMLKE ACRAYGLKSG LKKQELLEAL TKHFQD

UniProtKB: DNA repair protein Ku70

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Macromolecule #2: X-ray repair cross-complementing protein 5

MacromoleculeName: X-ray repair cross-complementing protein 5 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 82.812438 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MVRSGNKAAV VLCMDVGFTM SNSIPGIESP FEQAKKVITM FVQRQVFAEN KDEIALVLFG TDGTDNPLSG GDQYQNITVH RHLMLPDFD LLEDIESKIQ PGSQQADFLD ALIVSMDVIQ HETIGKKFEK RHIEIFTDLS SRFSKSQLDI IIHSLKKCDI S LQFFLPFS ...String:
MVRSGNKAAV VLCMDVGFTM SNSIPGIESP FEQAKKVITM FVQRQVFAEN KDEIALVLFG TDGTDNPLSG GDQYQNITVH RHLMLPDFD LLEDIESKIQ PGSQQADFLD ALIVSMDVIQ HETIGKKFEK RHIEIFTDLS SRFSKSQLDI IIHSLKKCDI S LQFFLPFS LGKEDGSGDR GDGPFRLGGH GPSFPLKGIT EQQKEGLEIV KMVMISLEGE DGLDEIYSFS ESLRKLCVFK KI ERHSIHW PCRLTIGSNL SIRIAAYKSI LQERVKKTWT VVDAKTLKKE DIQKETVYCL NDDDETEVLK EDIIQGFRYG SDI VPFSKV DEEQMKYKSE GKCFSVLGFC KSSQVQRRFF MGNQVLKVFA ARDDEAAAVA LSSLIHALDD LDMVAIVRYA YDKR ANPQV GVAFPHIKHN YECLVYVQLP FMEDLRQYMF SSLKNSKKYA PTEAQLNAVD ALIDSMSLAK KDEKTDTLED LFPTT KIPN PRFQRLFQCL LHRALHPREP LPPIQQHIWN MLNPPAEVTT KSQIPLSKIK TLFPLIEAKK KDQVTAQEIF QDNHED GPT AKKLKTEQGG AHFSVSSLAE GSVTSVGSVN PAENFRVLVK QKKASFEEAS NQLINHIEQF LDTNETPYFM KSIDCIR AF REEAIKFSEE QRFNNFLKAL QEKVEIKQLN HFWEIVVQDG ITLITKEEAS GSSVTAEEAK KFLAPKDKPS GDTAAVFE E GGDVDDLLDM I

UniProtKB: DNA repair protein Ku80

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Macromolecule #3: Histone H2AX

MacromoleculeName: Histone H2AX / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 15.172605 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSGRGKTGGK ARAKAKSRSS RAGLQFPVGR VHRLLRKGHY AERVGAGAPV YLAAVLEYLT AEILELAGNA ARDNKKTRII PRHLQLAIR NDEELNKLLG GVTIAQGGVL PNIQAVLLPK KTSATVGPKA PSGGKKATQA SQEY

UniProtKB: Histone H2AX

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Macromolecule #4: Histone H2B type 1-J

MacromoleculeName: Histone H2B type 1-J / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 13.935239 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MPEPAKSAPA PKKGSKKAVT KAQKKDGKKR KRSRKESYSI YVYKVLKQVH PDTGISSKAM GIMNSFVNDI FERIAGEASR LAHYNKRST ITSREIQTAV RLLLPGELAK HAVSEGTKAV TKYTSAK

UniProtKB: Histone H2B type 1-J

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Macromolecule #5: Histone H3.1

MacromoleculeName: Histone H3.1 / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 15.437167 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MARTKQTARK STGGKAPRKQ LATKAARKSA PATGGVKKPH RYRPGTVALR EIRRYQKSTE LLIRKLPFQR LVREIAQDFK TDLRFQSSA VMALQEACEA YLVGLFEDTN LCAIHAKRVT IMPKDIQLAR RIRGERA

UniProtKB: Histone H3.1

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Macromolecule #6: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.394426 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSGRGKGGKG LGKGGAKRHR KVLRDNIQGI TKPAIRRLAR RGGVKRISGL IYEETRGVLK VFLENVIRDA VTYTEHAKRK TVTAMDVVY ALKRQGRTLY GFGG

UniProtKB: Histone H4

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Macromolecule #7: DNA

MacromoleculeName: DNA / type: dna / ID: 7 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.998945 KDa
SequenceString: (DA)(DT)(DC)(DC)(DT)(DG)(DG)(DA)(DG)(DA) (DA)(DT)(DC)(DC)(DC)(DG)(DG)(DT)(DG)(DC) (DC)(DG)(DA)(DG)(DG)(DC)(DC)(DG)(DC) (DT)(DC)(DA)(DA)(DT)(DT)(DG)(DG)(DT)(DC) (DG) (DT)(DA)(DG)(DA)(DC)(DA) ...String:
(DA)(DT)(DC)(DC)(DT)(DG)(DG)(DA)(DG)(DA) (DA)(DT)(DC)(DC)(DC)(DG)(DG)(DT)(DG)(DC) (DC)(DG)(DA)(DG)(DG)(DC)(DC)(DG)(DC) (DT)(DC)(DA)(DA)(DT)(DT)(DG)(DG)(DT)(DC) (DG) (DT)(DA)(DG)(DA)(DC)(DA)(DG)(DC) (DT)(DC)(DT)(DA)(DG)(DC)(DA)(DC)(DC)(DG) (DC)(DT) (DT)(DA)(DA)(DA)(DC)(DG)(DC) (DA)(DC)(DG)(DT)(DA)(DC)(DG)(DC)(DG)(DC) (DT)(DG)(DT) (DC)(DC)(DC)(DC)(DC)(DG) (DC)(DG)(DT)(DT)(DT)(DT)(DA)(DA)(DC)(DC) (DG)(DC)(DC)(DA) (DA)(DG)(DG)(DG)(DG) (DA)(DT)(DT)(DA)(DC)(DT)(DC)(DC)(DC)(DT) (DA)(DG)(DT)(DC)(DT) (DC)(DC)(DA)(DG) (DG)(DC)(DA)(DC)(DG)(DT)(DG)(DT)(DC)(DA) (DG)(DA)(DT)(DA)(DT)(DA) (DT)(DA)(DC) (DA)(DT)(DC)(DC)(DT)(DG)(DT)(DG)(DA)(DT)

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Macromolecule #8: DNA

MacromoleculeName: DNA / type: dna / ID: 8 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 47.457234 KDa
SequenceString: (DA)(DT)(DC)(DA)(DC)(DA)(DG)(DG)(DA)(DT) (DG)(DT)(DA)(DT)(DA)(DT)(DA)(DT)(DC)(DT) (DG)(DA)(DC)(DA)(DC)(DG)(DT)(DG)(DC) (DC)(DT)(DG)(DG)(DA)(DG)(DA)(DC)(DT)(DA) (DG) (DG)(DG)(DA)(DG)(DT)(DA) ...String:
(DA)(DT)(DC)(DA)(DC)(DA)(DG)(DG)(DA)(DT) (DG)(DT)(DA)(DT)(DA)(DT)(DA)(DT)(DC)(DT) (DG)(DA)(DC)(DA)(DC)(DG)(DT)(DG)(DC) (DC)(DT)(DG)(DG)(DA)(DG)(DA)(DC)(DT)(DA) (DG) (DG)(DG)(DA)(DG)(DT)(DA)(DA)(DT) (DC)(DC)(DC)(DC)(DT)(DT)(DG)(DG)(DC)(DG) (DG)(DT) (DT)(DA)(DA)(DA)(DA)(DC)(DG) (DC)(DG)(DG)(DG)(DG)(DG)(DA)(DC)(DA)(DG) (DC)(DG)(DC) (DG)(DT)(DA)(DC)(DG)(DT) (DG)(DC)(DG)(DT)(DT)(DT)(DA)(DA)(DG)(DC) (DG)(DG)(DT)(DG) (DC)(DT)(DA)(DG)(DA) (DG)(DC)(DT)(DG)(DT)(DC)(DT)(DA)(DC)(DG) (DA)(DC)(DC)(DA)(DA) (DT)(DT)(DG)(DA) (DG)(DC)(DG)(DG)(DC)(DC)(DT)(DC)(DG)(DG) (DC)(DA)(DC)(DC)(DG)(DG) (DG)(DA)(DT) (DT)(DC)(DT)(DC)(DC)(DA)(DG)(DG)(DA)(DT)

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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: 7.6
Component:
ConcentrationFormulaName
20.0 mMC8H18N2O4S2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid
200.0 mMNaClSodium Chloride
5.0 mMC4H10O2S2dithiothreitol
2.0 mMMgCl2Magnesium Chloride
0.5 mMC10H16N2O8Ethylenediaminetetraacetic Acid
8.0 mMC32H58N2O8S3-[(3-Cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Details: 30mA
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 13898 / Average exposure time: 2.17 sec. / Average electron dose: 50.12 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.7000000000000001 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
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:

7zt6

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.39 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: PHENIX / Number images used: 16914
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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