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- PDB-9qo5: Dissociation-state-4 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex -

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Entry
Database: PDB / ID: 9qo5
TitleDissociation-state-4 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex
Components
  • (COP9 signalosome complex subunit ...) x 9
  • (S-phase kinase-associated protein ...) x 2
  • Cullin-1
  • Cyclin-dependent kinases regulatory subunit 1
  • E3 ubiquitin-protein ligase RBX1
KeywordsLIGASE / E3 ligases / COP9 signalosome
Function / homology
Function and homology information


negative regulation of protein localization to nucleolus / positive regulation of protein polyubiquitination / COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / Parkin-FBXW7-Cul1 ubiquitin ligase complex / exosomal secretion / GTPase inhibitor activity / F-box domain binding ...negative regulation of protein localization to nucleolus / positive regulation of protein polyubiquitination / COP9 signalosome assembly / trophectodermal cell proliferation / macrophage migration inhibitory factor binding / regulation of IRE1-mediated unfolded protein response / Parkin-FBXW7-Cul1 ubiquitin ligase complex / exosomal secretion / GTPase inhibitor activity / F-box domain binding / cellular response to cell-matrix adhesion / deNEDDylase activity / Aberrant regulation of mitotic exit in cancer due to RB1 defects / protein deneddylation / regulation of protein neddylation / PcG protein complex / activation of NF-kappaB-inducing kinase activity / eukaryotic translation initiation factor 3 complex / cullin-RING-type E3 NEDD8 transferase / NEDD8 transferase activity / COP9 signalosome / positive regulation of ubiquitin protein ligase activity / cullin-RING ubiquitin ligase complex / Cul7-RING ubiquitin ligase complex / ubiquitin-dependent protein catabolic process via the C-end degron rule pathway / maintenance of protein location in nucleus / cellular response to chemical stress / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / cyclin-dependent protein serine/threonine kinase activator activity / positive regulation of protein autoubiquitination / negative regulation of protein neddylation / RNA polymerase II transcription initiation surveillance / protein neddylation / NEDD8 ligase activity / Hydrolases; Acting on peptide bonds (peptidases) / regulation of JNK cascade / RHOBTB1 GTPase cycle / metal-dependent deubiquitinase activity / VCB complex / negative regulation of response to oxidative stress / regulation of DNA damage response, signal transduction by p53 class mediator / Cul5-RING ubiquitin ligase complex / inner cell mass cell proliferation / SCF ubiquitin ligase complex / ubiquitin-ubiquitin ligase activity / negative regulation of type I interferon production / Cul2-RING ubiquitin ligase complex / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / positive regulation of intracellular estrogen receptor signaling pathway / Cul3-RING ubiquitin ligase complex / negative regulation of mitophagy / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Prolactin receptor signaling / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / response to light stimulus / cullin family protein binding / skeletal muscle cell differentiation / protein K63-linked ubiquitination / protein monoubiquitination / : / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / positive regulation of double-strand break repair via homologous recombination / cyclin-dependent protein kinase holoenzyme complex / Nuclear events stimulated by ALK signaling in cancer / JNK cascade / transcription-coupled nucleotide-excision repair / translation initiation factor activity / positive regulation of TORC1 signaling / regulation of cellular response to insulin stimulus / positive regulation of smooth muscle cell proliferation / negative regulation of insulin receptor signaling pathway / intrinsic apoptotic signaling pathway / post-translational protein modification / regulation of mitotic cell cycle / molecular function activator activity / T cell activation / animal organ morphogenesis / ubiquitin binding / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / cellular response to amino acid stimulus / Vpu mediated degradation of CD4 / Degradation of DVL / Dectin-1 mediated noncanonical NF-kB signaling / Activation of NF-kappaB in B cells / Degradation of GLI1 by the proteasome / G1/S transition of mitotic cell cycle / Iron uptake and transport / negative regulation of canonical Wnt signaling pathway / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / Recognition of DNA damage by PCNA-containing replication complex / Hedgehog 'on' state / Vif-mediated degradation of APOBEC3G / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1
Similarity search - Function
COP9 signalosome complex, subunit 9, metazoa / Myeloma-overexpressed-like / Cyclin-dependent kinase, regulatory subunit / Cyclin-dependent kinase, regulatory subunit superfamily / Cyclin-dependent kinase regulatory subunit / Cyclin-dependent kinases regulatory subunits signature 1. / Cyclin-dependent kinases regulatory subunits signature 2. / Cyclin-dependent kinase regulatory subunit / COP9 signalosome complex subunit 7, helix I / : ...COP9 signalosome complex, subunit 9, metazoa / Myeloma-overexpressed-like / Cyclin-dependent kinase, regulatory subunit / Cyclin-dependent kinase, regulatory subunit superfamily / Cyclin-dependent kinase regulatory subunit / Cyclin-dependent kinases regulatory subunits signature 1. / Cyclin-dependent kinases regulatory subunits signature 2. / Cyclin-dependent kinase regulatory subunit / COP9 signalosome complex subunit 7, helix I / : / COP9 signalosome complex subunit 7a helix I domain / COP9 signalosome complex subunit 3-like, C-terminal helix / CSN7 helical bundle subdomain / COP9 signalosome, subunit CSN8 / COP9 signalosome complex subunit 4, helix turn helix domain / : / CSN4/RPN5/eIF3a helix turn helix domain / COP9 signalosome complex subunit 3, N-terminal helical repeats / COP9 signalosome subunit 6 / : / COP9 signalosome complex subunit 1, C-terminal helix / Cop9 signalosome subunit 5 C-terminal domain / Cop9 signalosome subunit 5 C-terminal domain / A Receptor for Ubiquitination Targets / Leucine-rich repeat, cysteine-containing subtype / Eukaryotic translation initiation factor 3 subunit M eIF3m/COP9 signalosome complex subunit 7 COPS7 / Leucine-rich repeat - CC (cysteine-containing) subfamily / F-box domain profile. / F-box-like / F-box-like domain superfamily / SKP1 component, dimerisation / S-phase kinase-associated protein 1 / SKP1-like, dimerisation domain superfamily / Skp1 family, dimerisation domain / F-box domain / Zinc finger, RING-H2-type / RING-H2 zinc finger domain / Cullin protein neddylation domain / : / : / : / : / PSMD12/CSN4, N-terminal / 26S proteasome regulatory subunit Rpn7/COP9 signalosome complex subunit 1 / 26S proteasome regulatory subunit Rpn7, N-terminal / 26S proteasome subunit RPN7 / 26S Proteasome non-ATPase regulatory subunit 12/COP9 signalosome complex subunit 4 / Cullin, conserved site / Cullin family signature. / Cullin repeat-like-containing domain superfamily / Cullin protein, neddylation domain / Cullin / Cullin protein neddylation domain / PCI/PINT associated module / Cullin / Cullin, N-terminal / Cullin homology domain / Cullin homology domain superfamily / Cullin alpha solenoid domain / Cullin family profile. / CSN8/PSMD8/EIF3K / CSN8/PSMD8/EIF3K family / Rpn11/EIF3F, C-terminal / Maintenance of mitochondrial structure and function / : / motif in proteasome subunits, Int-6, Nip-1 and TRIP-15 / PCI domain / Proteasome component (PCI) domain / PCI domain profile. / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / JAB1/Mov34/MPN/PAD-1 ubiquitin protease / JAB/MPN domain / JAB1/MPN/MOV34 metalloenzyme domain / MPN domain / MPN domain profile. / SKP1/BTB/POZ domain superfamily / Leucine-rich repeat domain superfamily / Zinc finger RING-type profile. / Zinc finger, RING-type / Tetratricopeptide-like helical domain superfamily / Zinc finger, RING/FYVE/PHD-type / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
INOSITOL HEXAKISPHOSPHATE / Cyclin-dependent kinases regulatory subunit 1 / COP9 signalosome complex subunit 2 / E3 ubiquitin-protein ligase RBX1 / S-phase kinase-associated protein 1 / COP9 signalosome complex subunit 1 / S-phase kinase-associated protein 2 / Cullin-1 / COP9 signalosome complex subunit 6 / COP9 signalosome complex subunit 9 ...INOSITOL HEXAKISPHOSPHATE / Cyclin-dependent kinases regulatory subunit 1 / COP9 signalosome complex subunit 2 / E3 ubiquitin-protein ligase RBX1 / S-phase kinase-associated protein 1 / COP9 signalosome complex subunit 1 / S-phase kinase-associated protein 2 / Cullin-1 / COP9 signalosome complex subunit 6 / COP9 signalosome complex subunit 9 / COP9 signalosome complex subunit 5 / COP9 signalosome complex subunit 8 / COP9 signalosome complex subunit 4 / COP9 signalosome complex subunit 7b / COP9 signalosome complex subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å
AuthorsDing, S. / Clapperton, J.A. / Maeots, M.E. / Enchev, R.I.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
The Francis Crick InstituteCC2059 United Kingdom
CitationJournal: Nat Commun / Year: 2026
Title: Structural basis of CSN-mediated SCF deneddylation.
Authors: Shan Ding / Julie A Clapperton / Märt-Erik Mäeots / Simone Kunzelmann / Mohammed Shaaban / Radoslav I Enchev /
Abstract: Cullin-RING ligases (CRLs) are the largest family of E3 ligases, with ubiquitination activity dynamically regulated by neddylation and deneddylation by the COP9 signalosome (CSN). CSN-mediated ...Cullin-RING ligases (CRLs) are the largest family of E3 ligases, with ubiquitination activity dynamically regulated by neddylation and deneddylation by the COP9 signalosome (CSN). CSN-mediated deneddylation not only deactivates CRLs but also enables substrate receptor exchange. Although CSN is a promising drug target, the structural basis underlying its catalytic mechanism remains unclear. Here, we use cryo-electron microscopy (cryo-EM) to uncover distinct functional states of CSN-CRL (SCF) complexes, capturing key intermediates of the deneddylation cycle. We visualise an autoinhibited docking state and a catalytic intermediate in which CSN5 Ins-1 loop, RBX1 RING and neddylated Cullin WHB domains are repositioned for isopeptide cleavage. We further resolve four dissociation intermediates that define the stepwise release of CSN from its product, with RBX1 RING stabilising key interactions. Additionally, our structures locate CSNAP within a CSN3-CSN8 groove. Together, our study provides a mechanistic model for CSN function and informs the rational design of CSN-targeted therapeutics.
History
DepositionMar 25, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 4, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
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Assembly

Deposited unit
A: COP9 signalosome complex subunit 1
B: COP9 signalosome complex subunit 2
C: COP9 signalosome complex subunit 3
D: COP9 signalosome complex subunit 4
F: COP9 signalosome complex subunit 6
G: COP9 signalosome complex subunit 7b
H: COP9 signalosome complex subunit 8
I: Cullin-1
J: E3 ubiquitin-protein ligase RBX1
L: S-phase kinase-associated protein 1
M: S-phase kinase-associated protein 2
N: Cyclin-dependent kinases regulatory subunit 1
E: COP9 signalosome complex subunit 5
P: COP9 signalosome complex subunit 9
hetero molecules


Theoretical massNumber of molelcules
Total (without water)513,39416
Polymers512,66814
Non-polymers7252
Water181
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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COP9 signalosome complex subunit ... , 9 types, 9 molecules ABCDFGHEP

#1: Protein COP9 signalosome complex subunit 1 / Signalosome subunit 1 / G protein pathway suppressor 1 / GPS-1 / JAB1-containing signalosome ...Signalosome subunit 1 / G protein pathway suppressor 1 / GPS-1 / JAB1-containing signalosome subunit 1 / Protein MFH


Mass: 55606.496 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GPS1, COPS1, CSN1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q13098
#2: Protein COP9 signalosome complex subunit 2 / Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid receptor- ...Signalosome subunit 2 / Alien homolog / JAB1-containing signalosome subunit 2 / Thyroid receptor-interacting protein 15 / TRIP-15


Mass: 51664.570 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS2, CSN2, TRIP15 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P61201
#3: Protein COP9 signalosome complex subunit 3 / SGN3 / Signalosome subunit 3 / JAB1-containing signalosome subunit 3


Mass: 47924.008 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS3, CSN3 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9UNS2
#4: Protein COP9 signalosome complex subunit 4 / Signalosome subunit 4 / JAB1-containing signalosome subunit 4


Mass: 46322.688 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS4, CSN4 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9BT78
#5: Protein COP9 signalosome complex subunit 6 / Signalosome subunit 6 / JAB1-containing signalosome subunit 6 / MOV34 homolog / Vpr-interacting protein / hVIP


Mass: 36203.398 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS6, CSN6, HVIP / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q7L5N1
#6: Protein COP9 signalosome complex subunit 7b / SGN7b / Signalosome subunit 7b / JAB1-containing signalosome subunit 7b


Mass: 29656.928 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS7B, CSN7B / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9H9Q2
#7: Protein COP9 signalosome complex subunit 8 / Signalosome subunit 8 / COP9 homolog / hCOP9 / JAB1-containing signalosome subunit 8


Mass: 23245.543 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS8, CSN8 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q99627
#13: Protein COP9 signalosome complex subunit 5 / SGN5 / Signalosome subunit 5 / Jun activation domain-binding protein 1


Mass: 37563.707 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS5, CSN5, JAB1 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: Q92905, Hydrolases; Acting on peptide bonds (peptidases)
#14: Protein COP9 signalosome complex subunit 9 / CSN acidic protein / CSNAP / Myeloma-overexpressed gene 2 protein


Mass: 6213.689 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: COPS9, MYEOV2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q8WXC6

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Protein , 3 types, 3 molecules IJN

#8: Protein Cullin-1 / CUL-1


Mass: 89800.367 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CUL1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q13616
#9: Protein E3 ubiquitin-protein ligase RBX1 / E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / ...E3 ubiquitin-protein transferase RBX1 / Protein ZYP / RING finger protein 75 / RING-box protein 1 / Rbx1 / Regulator of cullins 1 / ROC1


Mass: 12289.977 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: RBX1, RNF75, ROC1 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P62877, RING-type E3 ubiquitin transferase, cullin-RING-type E3 NEDD8 transferase
#12: Protein Cyclin-dependent kinases regulatory subunit 1 / CKS-1


Mass: 9679.211 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CKS1B, CKS1, PNAS-143, PNAS-16 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P61024

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S-phase kinase-associated protein ... , 2 types, 2 molecules LM

#10: Protein S-phase kinase-associated protein 1 / Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti ...Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti protein II / OCP-II / RNA polymerase II elongation factor-like protein / SIII / Transcription elongation factor B polypeptide 1-like / p19skp1


Mass: 18679.965 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP1, EMC19, OCP2, SKP1A, TCEB1L / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P63208
#11: Protein S-phase kinase-associated protein 2 / Cyclin-A/CDK2-associated protein p45 / F-box protein Skp2 / F-box/LRR-repeat protein 1 / p45skp2


Mass: 47817.785 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP2, FBXL1 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q13309

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Non-polymers , 3 types, 3 molecules

#15: Chemical ChemComp-IHP / INOSITOL HEXAKISPHOSPHATE / MYO-INOSITOL HEXAKISPHOSPHATE / INOSITOL 1,2,3,4,5,6-HEXAKISPHOSPHATE


Mass: 660.035 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H18O24P6 / Feature type: SUBJECT OF INVESTIGATION
#16: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#17: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
19-subunit COP9 signalosome and SCF (Skp1-Skp2-Cks1) complexCOMPLEX#1-#4, #13, #5-#12, #140RECOMBINANT
29-subunit COP9 signalosomeCOMPLEX#1-#4, #13, #5-#7, #141RECOMBINANT
3SCF (Skp1-Skp2-Cks1) complexCOMPLEX#8-#121RECOMBINANT
4Cullin-1/Rbx1COMPLEX#8-#93RECOMBINANT
5Skp1-Skp2-Cks1 complexCOMPLEX#10-#123RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
32Homo sapiens (human)9606
43Homo sapiens (human)9606
54Homo sapiens (human)9606
65Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
21Spodoptera frugiperda (fall armyworm)7108
32Spodoptera frugiperda (fall armyworm)7108
43Spodoptera frugiperda (fall armyworm)7108
54Spodoptera frugiperda (fall armyworm)7108
65Escherichia coli BL21(DE3) (bacteria)469008
Buffer solutionpH: 7.5 / Details: 15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 500 nm / Nominal defocus min: 50 nm
Image recordingElectron dose: 47 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1crYOLOparticle selection
2PHENIX1.21.1_5286model refinement
13RELION3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 131512 / Symmetry type: POINT

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