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- EMDB-31032: Cryo-EM structure of Gi-bound metabotropic glutamate receptor mGlu4 -

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Basic information

Entry
Database: EMDB / ID: EMD-31032
TitleCryo-EM structure of Gi-bound metabotropic glutamate receptor mGlu4
Map data
Sample
  • Complex: Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in presence of antibody
    • Protein or peptide: Metabotropic glutamate receptor 4
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-3
    • 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
    • Protein or peptide: scFv16
  • Ligand: PHOSPHOSERINE
KeywordsmGlu4 / GPCR / Cryo-EM / complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


adenylate cyclase-inhibiting G protein-coupled glutamate receptor signaling pathway / adenylate cyclase inhibiting G protein-coupled glutamate receptor activity / neurotransmitter secretion / G protein-coupled glutamate receptor signaling pathway / negative regulation of adenylate cyclase activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate receptor activity / GTP metabolic process / G protein-coupled dopamine receptor signaling pathway / positive regulation of macroautophagy ...adenylate cyclase-inhibiting G protein-coupled glutamate receptor signaling pathway / adenylate cyclase inhibiting G protein-coupled glutamate receptor activity / neurotransmitter secretion / G protein-coupled glutamate receptor signaling pathway / negative regulation of adenylate cyclase activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate receptor activity / GTP metabolic process / G protein-coupled dopamine receptor signaling pathway / positive regulation of macroautophagy / Adenylate cyclase inhibitory pathway / regulation of synaptic transmission, glutamatergic / regulation of neuron apoptotic process / G protein-coupled receptor binding / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / photoreceptor disc membrane / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / GDP binding / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / presynapse / GTPase binding / Ca2+ pathway / retina development in camera-type eye / midbody / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / fibroblast proliferation / cytoplasmic vesicle / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (i) signalling events / G alpha (s) signalling events / chemical synaptic transmission / G alpha (q) signalling events / Ras protein signal transduction / positive regulation of MAPK cascade / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / cell division / GTPase activity / centrosome / synapse / protein-containing complex binding / nucleolus / GTP binding / Golgi apparatus / signal transduction / extracellular exosome / nucleoplasm / membrane / metal ion binding / plasma membrane / cytosol / cytoplasm
Similarity search - Function
GPCR, family 3, metabotropic glutamate receptor 4 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. ...GPCR, family 3, metabotropic glutamate receptor 4 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / G-protein alpha subunit, group I / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / 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 / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / 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. / WD domain, G-beta repeat / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(i) subunit alpha-3 / 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 / Metabotropic glutamate receptor 4
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsLin S / Han S
Funding support China, 5 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)31825010 China
National Science Foundation (NSF, China)81525024 China
National Science Foundation (NSF, China)81872915 China
National Science Foundation (NSF, China)81773792 China
National Science Foundation (NSF, China)81973373 China
CitationJournal: Nature / Year: 2021
Title: Structures of G-bound metabotropic glutamate receptors mGlu2 and mGlu4.
Authors: Shuling Lin / Shuo Han / Xiaoqing Cai / Qiuxiang Tan / Kexiu Zhou / Dejian Wang / Xinwei Wang / Juan Du / Cuiying Yi / Xiaojing Chu / Antao Dai / Yan Zhou / Yan Chen / Yu Zhou / Hong Liu / ...Authors: Shuling Lin / Shuo Han / Xiaoqing Cai / Qiuxiang Tan / Kexiu Zhou / Dejian Wang / Xinwei Wang / Juan Du / Cuiying Yi / Xiaojing Chu / Antao Dai / Yan Zhou / Yan Chen / Yu Zhou / Hong Liu / Jianfeng Liu / Dehua Yang / Ming-Wei Wang / Qiang Zhao / Beili Wu /
Abstract: The metabotropic glutamate receptors (mGlus) have key roles in modulating cell excitability and synaptic transmission in response to glutamate (the main excitatory neurotransmitter in the central ...The metabotropic glutamate receptors (mGlus) have key roles in modulating cell excitability and synaptic transmission in response to glutamate (the main excitatory neurotransmitter in the central nervous system). It has previously been suggested that only one receptor subunit within an mGlu homodimer is responsible for coupling to G protein during receptor activation. However, the molecular mechanism that underlies the asymmetric signalling of mGlus remains unknown. Here we report two cryo-electron microscopy structures of human mGlu2 and mGlu4 bound to heterotrimeric G protein. The structures reveal a G-protein-binding site formed by three intracellular loops and helices III and IV that is distinct from the corresponding binding site in all of the other G-protein-coupled receptor (GPCR) structures. Furthermore, we observed an asymmetric dimer interface of the transmembrane domain of the receptor in the two mGlu-G structures. We confirmed that the asymmetric dimerization is crucial for receptor activation, which was supported by functional data; this dimerization may provide a molecular basis for the asymmetric signal transduction of mGlus. These findings offer insights into receptor signalling of class C GPCRs.
History
DepositionMar 4, 2021-
Header (metadata) releaseJun 23, 2021-
Map releaseJun 23, 2021-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7e9h
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_31032.png

Downloads & links

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Map

FileDownload / File: emd_31032.map.gz / Format: CCP4 / Size: 189.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 369 pix.
= 385.605 Å		1.05 Å/pix.
x 363 pix.
= 379.335 Å		1.05 Å/pix.
x 370 pix.
= 386.65 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

generated in cubic-lattice coordinate

Voxel sizeX=Y=Z: 1.045 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.013 / Movie #1: 0.013
Minimum - Maximum-0.0138853155 - 0.13099004
Average (Standard dev.)0.00037723707 (±0.0016991734)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions363370369
Spacing370363369
CellA: 386.65 Å / B: 379.335 Å / C: 385.60498 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0451.0451.045
M x/y/z370363369
origin x/y/z0.0000.0000.000
length x/y/z386.650379.335385.605
α/β/γ90.00090.00090.000
start NX/NY/NZ192139186
NX/NY/NZ211274246
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS370363369
D min/max/mean-0.0140.1310.000

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Supplemental data

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Sample components

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Entire : Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in pre...

EntireName: Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in presence of antibody
Components
  • Complex: Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in presence of antibody
    • Protein or peptide: Metabotropic glutamate receptor 4
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-3
    • 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
    • Protein or peptide: scFv16
  • Ligand: PHOSPHOSERINE

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Supramolecule #1: Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in pre...

SupramoleculeName: Complex of mGlu4 homodimer with heterotrimeric Gi3 protein in presence of antibody
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Metabotropic glutamate receptor 4

MacromoleculeName: Metabotropic glutamate receptor 4 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 99.458359 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: DYKDDDDGAP KPKGHPHMNS IRIDGDITLG GLFPVHGRGS EGKPCGELKK EKGIHRLEAM LFALDRINND PDLLPNITLG ARILDTCSR DTHALEQSLT FVQALIEKDG TEVRCGSGGP PIITKPERVV GVIGASGSSV SIMVANILRL FKIPQISYAS T APDLSDNS ...String:
DYKDDDDGAP KPKGHPHMNS IRIDGDITLG GLFPVHGRGS EGKPCGELKK EKGIHRLEAM LFALDRINND PDLLPNITLG ARILDTCSR DTHALEQSLT FVQALIEKDG TEVRCGSGGP PIITKPERVV GVIGASGSSV SIMVANILRL FKIPQISYAS T APDLSDNS RYDFFSRVVP SDTYQAQAMV DIVRALKWNY VSTVASEGSY GESGVEAFIQ KSREDGGVCI AQSVKIPREP KA GEFDKII RRLLETSNAR AVIIFANEDD IRRVLEAARR ANQTGHFFWM GSDSWGSKIA PVLHLEEVAE GAVTILPKRM SVR GFDRYF SSRTLDNNRR NIWFAEFWED NFHCKLSRHA LKKGSHVKKC TNRERIGQDS AYEQEGKVQF VIDAVYAMGH ALHA MHRDL CPGRVGLCPR MDPVDGTQLL KYIRNVNFSG IAGNPVTFNE NGDAPGRYDI YQYQLRNDSA EYKVIGSWTD HLHLR IERM HWPGSGQQLP RSICSLPCQP GERKKTVKGM PCCWHCEPCT GYQYQVDRYT CKTCPYDMRP TENRTGCRPI PIIKLE WGS PWAVLPLFLA VVGIAATLFV VITFVRYNDT PIVKASGREL SYVLLAGIFL CYATTFLMIA EPDLGTCSLR RIFLGLG MS ISYAALLTKT NRIYRIFEQG KRSVSAPRFI SPASQLAITF SLISLQLLGI CVWFVVDPSH SVVDFQDQRT LDPRFARG V LKCDISDLSL ICLLGYSMLL MVTCTVYAIK TRGVPETFNE AKPIGFTMYT TCIVWLAFIP IFFGTSQSAD KLYIQTTTL TVSVSLSASV SLGMLYMPKV YIILFHPEQN VPKRKRSLKA VVTAATMSNK FTQKGNFRPN GEAKSELCEN LEAPALATKQ TYVTYTNHA I

UniProtKB: Metabotropic glutamate receptor 4

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Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-3

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-3
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.55207 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AKEVKLLLLG AGESGKNTIV KQMKIIHEDG YSEDECKQYK VVVYSNTIQS IIAIIRAMG RLKIDFGEAA RADDARQLFV LAGSAEEGVM TPELAGVIKR LWRDGGVQAC FSRSREYQLN DSASYYLNDL D RISQSNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AKEVKLLLLG AGESGKNTIV KQMKIIHEDG YSEDECKQYK VVVYSNTIQS IIAIIRAMG RLKIDFGEAA RADDARQLFV LAGSAEEGVM TPELAGVIKR LWRDGGVQAC FSRSREYQLN DSASYYLNDL D RISQSNYI PTQQDVLRTR VKTTGIVETH FTDKDLYFKM FDVGAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTETSIILF LNKKDLFEEK IKRSPLTICY PEYTGSNTYE EAAAYIQCQF EDLNRRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKECGLY

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-3

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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: 38.744371 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI ...String:
MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI VTSSGDTTCA LWDIETGQQT TTFTGHTGDV MSLSLAPDTR LFVSGACDAS AKLWDVREGM CRQTFTGHES DI NAICFFP NGNAFATGSD DATCRLFDLR ADQELMTYSH DNIICGITSV SFSKSGRLLL AGYDDFNCNV WDALKADRAG VLA GHDNRV SCLGVTDDGM AVATGSWDSF LKIWN

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: Baculovirus expression vector pFastBac1-HM
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: Homo sapiens (human)
Molecular weightTheoretical: 27.409588 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
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 KAAALEVLFQ

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Macromolecule #6: PHOSPHOSERINE

MacromoleculeName: PHOSPHOSERINE / type: ligand / ID: 6 / Number of copies: 2 / Formula: SEP
Molecular weightTheoretical: 185.072 Da
Chemical component information

ChemComp-SEP:
PHOSPHOSERINE

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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

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 70.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 617760
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: ANGULAR RECONSTITUTION

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