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- EMDB-27969: CryoEM structure of miniGq-coupled hM3R in complex with Iperoxo -

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Entry
Database: EMDB / ID: EMD-27969
TitleCryoEM structure of miniGq-coupled hM3R in complex with Iperoxo
Map dataCryoEM structure of miniGq-coupled hM3R in complex with Iperoxo
Sample
  • Complex: Gq-coupled hM3R complex
    • Complex: muscarinic acetylcholine receptor 3, miniGq protein, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Muscarinic acetylcholine receptor M3
      • Protein or peptide: miniGq
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Complex: Single-chain variable fragment scFv16
      • Protein or peptide: scFv16
  • Ligand: 4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium
  • Ligand: CHOLESTEROL HEMISUCCINATE
KeywordsGPCR / IXO / active state / MEMBRANE PROTEIN / hM3R / Iperoxo
Function / homology
Function and homology information


saliva secretion / phospholipase C-activating G protein-coupled acetylcholine receptor signaling pathway / Muscarinic acetylcholine receptors / Acetylcholine regulates insulin secretion / G protein-coupled acetylcholine receptor activity / phosphatidylinositol-4,5-bisphosphate phospholipase C activity / regulation of smooth muscle contraction / positive regulation of smooth muscle contraction / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / acetylcholine binding ...saliva secretion / phospholipase C-activating G protein-coupled acetylcholine receptor signaling pathway / Muscarinic acetylcholine receptors / Acetylcholine regulates insulin secretion / G protein-coupled acetylcholine receptor activity / phosphatidylinositol-4,5-bisphosphate phospholipase C activity / regulation of smooth muscle contraction / positive regulation of smooth muscle contraction / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / acetylcholine binding / acetylcholine receptor signaling pathway / ligand-gated ion channel signaling pathway / smooth muscle contraction / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / basal plasma membrane / protein modification process / calcium-mediated signaling / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / positive regulation of insulin secretion / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / nervous system development / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / G-protein beta-subunit binding / G alpha (12/13) signalling events / Inactivation, recovery and regulation of the phototransduction cascade / extracellular vesicle / sensory perception of taste / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / retina development in camera-type eye / signaling receptor activity / GTPase binding / fibroblast proliferation / Ca2+ pathway / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / basolateral plasma membrane / chemical synaptic transmission / Ras protein signal transduction / postsynaptic membrane / cell population proliferation / Extra-nuclear estrogen signaling / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / dendrite / endoplasmic reticulum membrane / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Muscarinic acetylcholine receptor M3 / Muscarinic acetylcholine receptor family / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain ...Muscarinic acetylcholine receptor M3 / Muscarinic acetylcholine receptor family / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Muscarinic acetylcholine receptor M3 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.69 Å
AuthorsZhang S / Fay JF / Roth BL
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)U24DK1169195 United States
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)Psychoactive Drug Screening (PDSP) United States
CitationJournal: Nature / Year: 2022
Title: Molecular basis for selective activation of DREADD-based chemogenetics.
Authors: Shicheng Zhang / Ryan H Gumpper / Xi-Ping Huang / Yongfeng Liu / Brian E Krumm / Can Cao / Jonathan F Fay / Bryan L Roth /
Abstract: Designer receptors exclusively activated by designer drugs (DREADDs) represent a powerful chemogenetic technology for the remote control of neuronal activity and cellular signalling. The muscarinic ...Designer receptors exclusively activated by designer drugs (DREADDs) represent a powerful chemogenetic technology for the remote control of neuronal activity and cellular signalling. The muscarinic receptor-based DREADDs are the most widely used chemogenetic tools in neuroscience research. The G-coupled DREADD (hM3Dq) is used to enhance neuronal activity, whereas the G-coupled DREADD (hM4Di) is utilized to inhibit neuronal activity. Here we report four DREADD-related cryogenic electron microscopy high-resolution structures: a hM3Dq-miniG complex and a hM4Di-miniG complex bound to deschloroclozapine; a hM3Dq-miniG complex bound to clozapine-N-oxide; and a hM3R-miniG complex bound to iperoxo. Complemented with mutagenesis, functional and computational simulation data, our structures reveal key details of the recognition of DREADD chemogenetic actuators and the molecular basis for activation. These findings should accelerate the structure-guided discovery of next-generation chemogenetic tools.
History
DepositionAug 27, 2022-
Header (metadata) releaseNov 30, 2022-
Map releaseNov 30, 2022-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27969.png

Downloads & links

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Map

FileDownload / File: emd_27969.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryoEM structure of miniGq-coupled hM3R in complex with Iperoxo
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.88 Å/pix.
x 288 pix.
= 253.44 Å		0.88 Å/pix.
x 288 pix.
= 253.44 Å		0.88 Å/pix.
x 288 pix.
= 253.44 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.88 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.023729185 - 1.8621538
Average (Standard dev.)0.0010651087 (±0.021052795)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 253.44 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half Map 1

Fileemd_27969_half_map_1.map
AnnotationHalf Map 1
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: Half Map 2

Fileemd_27969_half_map_2.map
AnnotationHalf Map 2
Projections & Slices
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Histogram

Histogram (log scale)

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Sample components

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Entire : Gq-coupled hM3R complex

EntireName: Gq-coupled hM3R complex
Components
  • Complex: Gq-coupled hM3R complex
    • Complex: muscarinic acetylcholine receptor 3, miniGq protein, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Muscarinic acetylcholine receptor M3
      • Protein or peptide: miniGq
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Complex: Single-chain variable fragment scFv16
      • Protein or peptide: scFv16
  • Ligand: 4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium
  • Ligand: CHOLESTEROL HEMISUCCINATE

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Supramolecule #1: Gq-coupled hM3R complex

SupramoleculeName: Gq-coupled hM3R complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5

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Supramolecule #2: muscarinic acetylcholine receptor 3, miniGq protein, Guanine nucl...

SupramoleculeName: muscarinic acetylcholine receptor 3, miniGq protein, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Single-chain variable fragment scFv16

SupramoleculeName: Single-chain variable fragment scFv16 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #5
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Muscarinic acetylcholine receptor M3

MacromoleculeName: Muscarinic acetylcholine receptor M3 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 62.966617 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: AGNFSSPDGT TDDPLGGHTV WQVVFIAFLT GILALVTIIG NILVIVSFKV NKQLKTVNNY FLLSLACADL IIGVISMNLF TTYIIMNRW ALGNLACDLW LAIDYVASNA SVMNLLVISF DRYFSITRPL TYRAKRTTKR AGVMIGLAWV ISFVLWAPAI L FWQYFVGK ...String:
AGNFSSPDGT TDDPLGGHTV WQVVFIAFLT GILALVTIIG NILVIVSFKV NKQLKTVNNY FLLSLACADL IIGVISMNLF TTYIIMNRW ALGNLACDLW LAIDYVASNA SVMNLLVISF DRYFSITRPL TYRAKRTTKR AGVMIGLAWV ISFVLWAPAI L FWQYFVGK RTVPPGECFI QFLSEPTITF GTAIAAFYMP VTIMTILYWR IYKETEKRTK ELAGLQASGT EAETENFVHP AK RFALKTR SQITKRKRMS LVKEKKAAQT LSAILLAFII TWTPYNIMVL VNTFCDSCIP KTFWNLGYWL CYINSTVNPV CYA LCNKTF RTTFKMLLLC QCDKKKRRKQ QYQQRQSVIF HKRAPEQALG GSGGGGSGGS SSGGGGSGGG GSGGSSSGGV FTLE DFVGD WEQTAAYNLD QVLEQGGVSS LLQNLAVSVT PIQRIVRSGE NALKIDIHVI IPYEGLSADQ MAQIEEVFKV VYPVD DHHF KVILPYGTLV IDGVTPNMLN YFGRPYEGIA VFDGKKITVT GTLWNGNKII DERLITPDGS MLFRVTINSG GSGGHH HHH HHHHH

UniProtKB: Muscarinic acetylcholine receptor M3, Muscarinic acetylcholine receptor M3

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Macromolecule #2: miniGq

MacromoleculeName: miniGq / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 28.084832 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGSTVSAEDK AAAERSKMID KNLREDGEKA RRTLRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA ...String:
MGSTVSAEDK AAAERSKMID KNLREDGEKA RRTLRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA RYTTPEDATP EPGEDPRVTR AKYFIRKEFV DISTASGDGR HICYPHFTCA VDTENARRIF NDCKDIILQM NL REYNLV

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.79841 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLII WDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR FLDDNQIVTS S GDTTCALW ...String:
SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLII WDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR FLDDNQIVTS S GDTTCALW DIETGQQTTT FTGHTGDVMS LSLAPDTRLF VSGACDASAK LWDVREGMCR QTFTGHESDI NAICFFPNGN AF ATGSDDA TCRLFDLRAD QELMTYSHDN IICGITSVSF SKSGRLLLAG YDDFNCNVWD ALKADRAGVL AGHDNRVSCL GVT DDGMAV ATGSWDSFLK IWNGGSGGGG SGGSSSGGVS GWRLFKKISG GS

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #5: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 26.679721 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAA

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Macromolecule #6: 4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium

MacromoleculeName: 4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium
type: ligand / ID: 6 / Number of copies: 1 / Formula: IXO
Molecular weightTheoretical: 197.254 Da
Chemical component information

ChemComp-IXO:
4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium

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Macromolecule #7: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 7 / Number of copies: 1 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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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: 7.4
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 2858 / Average electron dose: 59.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.1 µm / Nominal defocus min: 0.2 µm
Experimental equipment
Model: Talos Arctica / 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:

6oij

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.69 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 462349
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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