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- EMDB-74385: The LBD-TMD structure of native mouse AMPAR with 3 TARPs 1 CNIH a... -

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Entry
Database: EMDB / ID: EMD-74385
TitleThe LBD-TMD structure of native mouse AMPAR with 3 TARPs 1 CNIH and PRRT1/SynDIG4
Map data
Sample
  • Complex: native mouse AMPAR
    • Protein or peptide: Glutamate receptor 1
    • Protein or peptide: Glutamate receptor 2
    • Protein or peptide: Protein cornichon homolog 2
    • Protein or peptide: Voltage-dependent calcium channel gamma-2 subunit
    • Protein or peptide: Voltage-dependent calcium channel gamma-8 subunit
    • Protein or peptide: Proline-rich transmembrane protein 1
  • Ligand: PALMITIC ACID
  • Ligand: (2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
KeywordsiGluR / AMPA receptors / SIGNALING PROTEIN
Function / homology
Function and homology information


negative regulation of receptor localization to synapse / negative regulation of anterograde synaptic vesicle transport / Phase 0 - rapid depolarisation / Phase 2 - plateau phase / Cargo concentration in the ER / Activation of AMPA receptors / COPII-mediated vesicle transport / Presynaptic depolarization and calcium channel opening / Synaptic adhesion-like molecules / LGI-ADAM interactions ...negative regulation of receptor localization to synapse / negative regulation of anterograde synaptic vesicle transport / Phase 0 - rapid depolarisation / Phase 2 - plateau phase / Cargo concentration in the ER / Activation of AMPA receptors / COPII-mediated vesicle transport / Presynaptic depolarization and calcium channel opening / Synaptic adhesion-like molecules / LGI-ADAM interactions / Unblocking of NMDA receptors, glutamate binding and activation / Trafficking of GluR2-containing AMPA receptors / cellular response to ammonium ion / axonal spine / positive regulation of locomotion involved in locomotory behavior / Trafficking of AMPA receptors / positive regulation of membrane potential / localization within membrane / response to sucrose / eye blink reflex / positive regulation of protein localization to basolateral plasma membrane / signaling receptor regulator activity / L-type voltage-gated calcium channel complex / regulation of monoatomic ion transmembrane transport / myosin V binding / positive regulation of AMPA receptor activity / cerebellar mossy fiber / neuron spine / postsynaptic neurotransmitter receptor diffusion trapping / proximal dendrite / protein phosphatase 2B binding / response to arsenic-containing substance / regulation of AMPA receptor activity / cellular response to L-glutamate / membrane hyperpolarization / channel regulator activity / protein localization to cell surface / cellular response to dsRNA / long-term synaptic depression / ligand-gated calcium channel activity / nervous system process / dendritic spine membrane / beta-2 adrenergic receptor binding / protein targeting to membrane / voltage-gated calcium channel complex / cellular response to peptide hormone stimulus / cellular response to amine stimulus / response to morphine / response to psychosocial stress / peptide hormone receptor binding / neurotransmitter receptor localization to postsynaptic specialization membrane / perisynaptic space / spinal cord development / neuronal cell body membrane / protein kinase A binding / response to lithium ion / neuromuscular junction development / AMPA glutamate receptor activity / behavioral response to pain / transmission of nerve impulse / regulation of receptor recycling / immunoglobulin binding / adenylate cyclase binding / AMPA glutamate receptor complex / response to electrical stimulus / ionotropic glutamate receptor complex / membrane depolarization / asymmetric synapse / G-protein alpha-subunit binding / glutamate receptor binding / positive regulation of synaptic transmission / conditioned place preference / long-term memory / regulation of postsynaptic membrane neurotransmitter receptor levels / neuronal action potential / voltage-gated calcium channel activity / postsynaptic density, intracellular component / response to fungicide / vesicle-mediated transport / glutamate-gated receptor activity / cellular response to brain-derived neurotrophic factor stimulus / positive regulation of synaptic transmission, glutamatergic / glutamate-gated calcium ion channel activity / somatodendritic compartment / synapse assembly / presynaptic active zone membrane / ionotropic glutamate receptor binding / dendrite membrane / excitatory synapse / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / positive regulation of excitatory postsynaptic potential / hippocampal mossy fiber to CA3 synapse / dendritic shaft / synaptic membrane / response to cocaine / PDZ domain binding / calcium channel regulator activity / neuromuscular junction / synaptic transmission, glutamatergic / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential
Similarity search - Function
CD225/Dispanin family / : / Interferon-induced transmembrane protein / Cornichon / Cornichon, conserved site / Cornichon protein / Cornichon family signature. / Cornichon / Voltage-dependent calcium channel, gamma-8 subunit / Voltage-dependent calcium channel, gamma-2 subunit ...CD225/Dispanin family / : / Interferon-induced transmembrane protein / Cornichon / Cornichon, conserved site / Cornichon protein / Cornichon family signature. / Cornichon / Voltage-dependent calcium channel, gamma-8 subunit / Voltage-dependent calcium channel, gamma-2 subunit / : / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / : / Ionotropic glutamate receptor / Eukaryotic homologues of bacterial periplasmic substrate binding proteins. / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I
Similarity search - Domain/homology
Glutamate receptor / Protein cornichon homolog 2 / Proline-rich transmembrane protein 1 / Voltage-dependent calcium channel gamma-2 subunit / Glutamate receptor 1 / Voltage-dependent calcium channel gamma-8 subunit
Similarity search - Component
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.75 Å
AuthorsFang CL / Gouaux E
Funding support United States, 1 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Sci Adv / Year: 2026
Title: Native AMPA receptor architecture reveals SynDIG4 engagement and auxiliary subunit heterogeneity.
Authors: Chengli Fang / Eric Gouaux /
Abstract: AMPA-type glutamate receptors (AMPARs) are complex assemblies whose compositional heterogeneity underlies diverse excitatory signaling in the mammalian brain. Here, we determine high-resolution cryo- ...AMPA-type glutamate receptors (AMPARs) are complex assemblies whose compositional heterogeneity underlies diverse excitatory signaling in the mammalian brain. Here, we determine high-resolution cryo-electron microscopy (cryo-EM) structures of native AMPAR complexes rapidly purified from mouse brain. These structures capture receptors in physiologically relevant assemblies containing distinct combinations of transmembrane AMPA receptor regulatory protein (TARP) and cornichon homolog (CNIH) auxiliary subunits and reveal unambiguous density for the brain-specific protein SynDIG4. The resolved topology and interaction network of SynDIG4 show that it engages the receptor through a CNIH-dependent interface and occupies a position adjacent to structural elements of GluA1 implicated in trafficking and synaptic plasticity. The diversity of auxiliary stoichiometries observed across native complexes highlights a flexible organizational scheme through which AMPARs incorporate distinct regulatory partners. These findings illuminate the organization of native AMPAR assemblies and define the structural context for SynDIG4 function in the mammalian brain.
History
DepositionDec 7, 2025-
Header (metadata) releaseApr 29, 2026-
Map releaseApr 29, 2026-
UpdateJun 24, 2026-
Current statusJun 24, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_74385.png

Downloads & links

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Map

FileDownload / File: emd_74385.map.gz / Format: CCP4 / Size: 229.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 392 pix.
= 323.4 Å		0.83 Å/pix.
x 392 pix.
= 323.4 Å		0.83 Å/pix.
x 392 pix.
= 323.4 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.825 Å
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Histogram (log scale)
Contour LevelBy AUTHOR: 0.078
Minimum - Maximum-0.3974398 - 0.49147233
Average (Standard dev.)0.0004014813 (±0.015522382)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions392392392
Spacing392392392
CellA=B=C: 323.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_74385_additional_1.map
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Half map: #1

Fileemd_74385_half_map_1.map
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Half map: #2

Fileemd_74385_half_map_2.map
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Sample components

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Entire : native mouse AMPAR

EntireName: native mouse AMPAR
Components
  • Complex: native mouse AMPAR
    • Protein or peptide: Glutamate receptor 1
    • Protein or peptide: Glutamate receptor 2
    • Protein or peptide: Protein cornichon homolog 2
    • Protein or peptide: Voltage-dependent calcium channel gamma-2 subunit
    • Protein or peptide: Voltage-dependent calcium channel gamma-8 subunit
    • Protein or peptide: Proline-rich transmembrane protein 1
  • Ligand: PALMITIC ACID
  • Ligand: (2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate

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Supramolecule #1: native mouse AMPAR

SupramoleculeName: native mouse AMPAR / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Glutamate receptor 1

MacromoleculeName: Glutamate receptor 1 / type: protein_or_peptide / ID: 1 / Details: Mix of AMPAR subunits (GluA1, GluA3, and GluA4) / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 55.260184 KDa
SequenceString: TYIVTTILED PYVMLKKNAN QFEGNDRYEG YCVELAAEIA KHVGYSYRLE IVSDGKYGAR DPDTKAWNGM VGELVYGRAD VAVAPLTIT LVREEVIDFS KPFMSLGISI MIKKPQKSKP GVFSFLDPLA YEIWMCIVFA YIGVSVVLFL VSRFSPYEWH S EEFEEGRD ...String:
TYIVTTILED PYVMLKKNAN QFEGNDRYEG YCVELAAEIA KHVGYSYRLE IVSDGKYGAR DPDTKAWNGM VGELVYGRAD VAVAPLTIT LVREEVIDFS KPFMSLGISI MIKKPQKSKP GVFSFLDPLA YEIWMCIVFA YIGVSVVLFL VSRFSPYEWH S EEFEEGRD QTTSDQSNEF GIFNSLWFSL GAFMQQGCDI SPRSLSGRIV GGVWWFFTLI IISSYTANLA AFLTVERMVS PI ESAEDLA KQTEIAYGTL EAGSTKEFFR RSKIAVFEKM WTYMKSAEPS VFVRTTEEGM IRVRKSKGKY AYLLESTMNE YIE QRKPCD TMKVGGNLDS KGYGIATPKG SALRGPVNLA VLKLSEQGVL DKLKSKWWYD KGECGSKDSG SKDKTSALSL SNVA GVFYI LIGGLGLAML VALIEFCYKS RSESKRMKGF CLIPQQSINE AIRTSTLPRN SGAGASGGSG SGENGRVVSQ DFPKS MQSI PCMSHSSGMP LGATGL

UniProtKB: Glutamate receptor 1

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Macromolecule #2: Glutamate receptor 2

MacromoleculeName: Glutamate receptor 2 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 52.118758 KDa
SequenceString: VVTTILESPY VMMKKNHEML EGNERYEGYC VDLAAEIAKH CGFKYKLTIV GDGKYGARDA DTKIWNGMVG ELVYGKADIA IAPLTITLV REEVIDFSKP FMSLGISIMI KKPQKSKPGV FSFLDPLAYE IWMCIVFAYI GVSVVLFLVS RFSPYEWHTE E FEDGRETQ ...String:
VVTTILESPY VMMKKNHEML EGNERYEGYC VDLAAEIAKH CGFKYKLTIV GDGKYGARDA DTKIWNGMVG ELVYGKADIA IAPLTITLV REEVIDFSKP FMSLGISIMI KKPQKSKPGV FSFLDPLAYE IWMCIVFAYI GVSVVLFLVS RFSPYEWHTE E FEDGRETQ SSESTNEFGI FNSLWFSLGA FMRQGCDISP RSLSGRIVGG VWWFFTLIII SSYTANLAAF LTVERMVSPI ES AEDLSKQ TEIAYGTLDS GSTKEFFRRS KIAVFDKMWT YMRSAEPSVF VRTTAEGVAR VRKSKGKYAY LLESTMNEYI EQR KPCDTM KVGGNLDSKG YGIATPKGSS LRNAVNLAVL KLNEQGLLDK LKNKWWYDKG ECGSGGGDSK EKTSALSLSN VAGV FYILV GGLGLAMLVA LIEFCYKSRA EAKRMKVAKN AQNINPSSSQ NSQNFATYKE GYNVYGIESV KI

UniProtKB: Glutamate receptor

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Macromolecule #3: Protein cornichon homolog 2

MacromoleculeName: Protein cornichon homolog 2 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 18.94842 KDa
SequenceString:
MAFTFAAFCY MLTLVLCASL IFFVIWHIIA FDELRTDFKN PIDQGNPARA RERLKNIERI CCLLRKLVVP EYSIHGLFCL MFLCAAEWV TLGLNIPLLF YHLWRYFHRP ADGSEVMYDA VSIMNADILN YCQKESWCKL AFYLLSFFYY LYSMVYTLVS F

UniProtKB: Protein cornichon homolog 2

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Macromolecule #4: Voltage-dependent calcium channel gamma-2 subunit

MacromoleculeName: Voltage-dependent calcium channel gamma-2 subunit / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 35.938746 KDa
SequenceString: MGLFDRGVQM LLTTVGAFAA FSLMTIAVGT DYWLYSRGVC KTKSVSENET SKKNEEVMTH SGLWRTCCLE GNFKGLCKQI DHFPEDADY EADTAEYFLR AVRASSIFPI LSVILLFMGG LCIAASEFYK TRHNIILSAG IFFVSAGLSN IIGIIVYISA N AGDPSKSD ...String:
MGLFDRGVQM LLTTVGAFAA FSLMTIAVGT DYWLYSRGVC KTKSVSENET SKKNEEVMTH SGLWRTCCLE GNFKGLCKQI DHFPEDADY EADTAEYFLR AVRASSIFPI LSVILLFMGG LCIAASEFYK TRHNIILSAG IFFVSAGLSN IIGIIVYISA N AGDPSKSD SKKNSYSYGW SFYFGALSFI IAEMVGVLAV HMFIDRHKQL RATARATDYL QASAITRIPS YRYRYQRRSR SS SRSTEPS HSRDASPVGV KGFNTLPSTE ISMYTLSRDP LKAATTPTAT YNSDRDNSFL QVHNCIQKDS KDSLHANTAN RRT TPV

UniProtKB: Voltage-dependent calcium channel gamma-2 subunit

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Macromolecule #5: Voltage-dependent calcium channel gamma-8 subunit

MacromoleculeName: Voltage-dependent calcium channel gamma-8 subunit / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 43.502938 KDa
SequenceString: MESLKRWNEE RGLWCEKGVQ VLLTTIGAFS AFGLMTIAIS TDYWLYTRAL ICNTTNLTAG DDGPPHRGGS GSSEKKDPGG LTHSGLWRI CCLEGLKRGV CVKINHFPED TDYDHDSAEY LLRVVRASSI FPILSAILLL LGGVCVAASR VYKSKRNIIL G AGILFVAA ...String:
MESLKRWNEE RGLWCEKGVQ VLLTTIGAFS AFGLMTIAIS TDYWLYTRAL ICNTTNLTAG DDGPPHRGGS GSSEKKDPGG LTHSGLWRI CCLEGLKRGV CVKINHFPED TDYDHDSAEY LLRVVRASSI FPILSAILLL LGGVCVAASR VYKSKRNIIL G AGILFVAA GLSNIIGVIV YISANAGEPG PKRDEEKKNH YSYGWSFYFG GLSFILAEVI GVLAVNIYIE RSREAHCQSR SD LLKAGGG AGGSGGSGPS AILRLPSYRF RYRRRSRSSS RGSSEASPSR DASPGGPGGP GFASTDISMY TLSRDPSKGS VAA GLASAG GGGSGAGVGA YGGAAGAAGG GGAGSERDRG SSAGFLTLHN AFPKEAASGV TVTVTGPPAA PAPAPAPPAP AAPA PGTLS KEAAASNTNT LNRKTTPV

UniProtKB: Voltage-dependent calcium channel gamma-8 subunit

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Macromolecule #6: Proline-rich transmembrane protein 1

MacromoleculeName: Proline-rich transmembrane protein 1 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 31.416805 KDa
SequenceString: MSSEKSGLPD SVPHTSPPPY NAPQPPAEPP IPPPQTAPSS HHHHHHHYHQ SGTATLPRLG AGGLASAAAS AQRGPSSSAT LPRPPHHAP PGPAAGAPPP GCATLPRMPP DPYLQETRFE GPLPPPPPAA AAPPPPAPAP TAQAPGFVVP THAGAVGTLP L GGYVAPGY ...String:
MSSEKSGLPD SVPHTSPPPY NAPQPPAEPP IPPPQTAPSS HHHHHHHYHQ SGTATLPRLG AGGLASAAAS AQRGPSSSAT LPRPPHHAP PGPAAGAPPP GCATLPRMPP DPYLQETRFE GPLPPPPPAA AAPPPPAPAP TAQAPGFVVP THAGAVGTLP L GGYVAPGY PLQLQPCTAY VPVYPVGTPY AGGTPGGPGV TSTLPPPPQG PGLALLEPRR PPHDYMPIAV LTTICCFWPT GI IAIFKAV QVRTALARGD LVSAEIASRE ARNFSFISLA VGIAAMVLCT ILTVVIIIAA QHHENYWDP

UniProtKB: Proline-rich transmembrane protein 1

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Macromolecule #7: PALMITIC ACID

MacromoleculeName: PALMITIC ACID / type: ligand / ID: 7 / Number of copies: 4 / Formula: PLM
Molecular weightTheoretical: 256.424 Da
Chemical component information

ChemComp-PLM:
PALMITIC ACID

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Macromolecule #8: (2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate

MacromoleculeName: (2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate / type: ligand / ID: 8 / Number of copies: 7 / Formula: OLC
Molecular weightTheoretical: 356.54 Da
Chemical component information

ChemComp-OLC:
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate

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Macromolecule #9: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 9 / Number of copies: 1 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM

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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: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOCONTINUUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: OTHER / Cs: 2.7 mm / Nominal defocus max: 2.2 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: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.75 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 17066
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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