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- EMDB-45908: Native human GABAA receptor of beta2-alpha1-beta3-alpha2-gamma2 a... -

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Basic information

Entry
Database: EMDB / ID: EMD-45908
TitleNative human GABAA receptor of beta2-alpha1-beta3-alpha2-gamma2 assembly
Map data
Sample
  • Complex: Native GABAA receptor from human brain
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-2
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-3
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-2
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Kappa Fab_1F4 Light Chain
    • Protein or peptide: IgG2b Fab_1F4 Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsIon channels / Heteropentamer / Receptor / Inhibitory. / MEMBRANE PROTEIN
Function / homology
Function and homology information


benzodiazepine receptor activity / inhibitory synapse / inner ear receptor cell development / GABA receptor complex / innervation / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex ...benzodiazepine receptor activity / inhibitory synapse / inner ear receptor cell development / GABA receptor complex / innervation / cellular response to histamine / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / gamma-aminobutyric acid signaling pathway / postsynaptic specialization membrane / synaptic transmission, GABAergic / cochlea development / chloride channel activity / adult behavior / roof of mouth development / Signaling by ERBB4 / chloride channel complex / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / dendrite membrane / cytoplasmic vesicle membrane / chloride transmembrane transport / post-embryonic development / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / GABA-ergic synapse / synaptic vesicle membrane / chemical synaptic transmission / dendritic spine / postsynaptic membrane / postsynapse / axon / neuronal cell body / signal transduction / extracellular exosome / identical protein binding / plasma membrane
Similarity search - Function
Gamma-aminobutyric-acid A receptor, alpha 2 subunit / : / Gamma-aminobutyric-acid A receptor, gamma 2 subunit / Gamma-aminobutyric acid receptor subunit gamma-1/4 / Gamma-aminobutyric-acid A receptor, alpha 1 subunit / : / Gamma-aminobutyric-acid A receptor, alpha subunit / Gamma-aminobutyric-acid A receptor, beta subunit / : / Gamma-aminobutyric acid A receptor/Glycine receptor alpha ...Gamma-aminobutyric-acid A receptor, alpha 2 subunit / : / Gamma-aminobutyric-acid A receptor, gamma 2 subunit / Gamma-aminobutyric acid receptor subunit gamma-1/4 / Gamma-aminobutyric-acid A receptor, alpha 1 subunit / : / Gamma-aminobutyric-acid A receptor, alpha subunit / Gamma-aminobutyric-acid A receptor, beta subunit / : / Gamma-aminobutyric acid A receptor/Glycine receptor alpha / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain
Similarity search - Domain/homology
Gamma-aminobutyric acid receptor subunit alpha-1 / Gamma-aminobutyric acid receptor subunit gamma-2 / Gamma-aminobutyric acid receptor subunit beta-3 / Gamma-aminobutyric acid receptor subunit alpha-2 / Gamma-aminobutyric acid receptor subunit beta-2
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.74 Å
AuthorsZhou J / Hibbs RE / Noviello CM
Funding support United States, 2 items
OrganizationGrant numberCountry
American Heart Association24POST1195454 United States
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)DA047325 United States
CitationJournal: Nature / Year: 2025
Title: Resolving native GABA receptor structures from the human brain.
Authors: Jia Zhou / Colleen M Noviello / Jinfeng Teng / Haley Moore / Bradley Lega / Ryan E Hibbs /
Abstract: Type A GABA (γ-aminobutyric acid) receptors (GABA receptors) mediate most fast inhibitory signalling in the brain and are targets for drugs that treat epilepsy, anxiety, depression and insomnia and ...Type A GABA (γ-aminobutyric acid) receptors (GABA receptors) mediate most fast inhibitory signalling in the brain and are targets for drugs that treat epilepsy, anxiety, depression and insomnia and for anaesthetics. These receptors comprise a complex array of 19 related subunits, which form pentameric ligand-gated ion channels. The composition and structure of native GABA receptors in the human brain have been inferred from subunit localization in tissue, functional measurements and structural analysis from recombinant expression and in mice. However, the arrangements of subunits that co-assemble physiologically in native human GABA receptors remain unknown. Here we isolated α1 subunit-containing GABA receptors from human patients with epilepsy. Using cryo-electron microscopy, we defined a set of 12 native subunit assemblies and their 3D structures. We address inconsistencies between previous native and recombinant approaches, and reveal details of previously undefined subunit interfaces. Drug-like densities in a subset of these interfaces led us to uncover unexpected activity on the GABA receptor of antiepileptic drugs and resulted in localization of one of these drugs to the benzodiazepine-binding site. Proteomics and further structural analysis suggest interactions with the auxiliary subunits neuroligin 2 and GARLH4, which localize and modulate GABA receptors at inhibitory synapses. This work provides a structural foundation for understanding GABA receptor signalling and targeted pharmacology in the human brain.
History
DepositionJul 25, 2024-
Header (metadata) releaseJan 22, 2025-
Map releaseJan 22, 2025-
UpdateMay 21, 2025-
Current statusMay 21, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45908.png

Downloads & links

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Map

FileDownload / File: emd_45908.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.94 Å/pix.
x 256 pix.
= 239.36 Å		0.94 Å/pix.
x 256 pix.
= 239.36 Å		0.94 Å/pix.
x 256 pix.
= 239.36 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.935 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.11
Minimum - Maximum-0.37969926 - 0.67130876
Average (Standard dev.)0.0026754714 (±0.02695695)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 239.36 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_45908_msk_1.map
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Additional map: #1

Fileemd_45908_additional_1.map
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Half map: #2

Fileemd_45908_half_map_1.map
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Half map: #1

Fileemd_45908_half_map_2.map
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Sample components

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Entire : Native GABAA receptor from human brain

EntireName: Native GABAA receptor from human brain
Components
  • Complex: Native GABAA receptor from human brain
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-2
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-1
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit beta-3
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit alpha-2
    • Protein or peptide: Gamma-aminobutyric acid receptor subunit gamma-2
    • Protein or peptide: Kappa Fab_1F4 Light Chain
    • Protein or peptide: IgG2b Fab_1F4 Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: Native GABAA receptor from human brain

SupramoleculeName: Native GABAA receptor from human brain / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Gamma-aminobutyric acid receptor subunit beta-2

MacromoleculeName: Gamma-aminobutyric acid receptor subunit beta-2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 56.391809 KDa
SequenceString: QSVNDPSNMS LVKETVDRLL KGYDIRLRPD FGGPPVAVGM NIDIASIDMV SEVNMDYTLT MYFQQAWRDK RLSYNVIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW ...String:
QSVNDPSNMS LVKETVDRLL KGYDIRLRPD FGGPPVAVGM NIDIASIDMV SEVNMDYTLT MYFQQAWRDK RLSYNVIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW RGDDNAVTGV TKIELPQFSI VDYKLITKKV VFSTGSYPRL SLSFKLKRNI GYFILQTYMP SILITILSWV SF WINYDAS AARVALGITT VLTMTTINTH LRETLPKIPY VKAIDMYLMG CFVFVFMALL EYALVNYIFF GRGPQRQKKA AEK AASANN EKMRLDVNKI FYKDIKQNGT QYRSLWDPTG NLSPTRRTTN YDFSLYTMDP HENILLSTLE IKNEMATSEA VMGL GDPRS TMLAYDASSI QYRKAGLPRH SFGRNALERH VAQKKSRLRR RASQLKITIP DLTDVNAIDR WSRIFFPVVF SFFNI VYWL YYVN

UniProtKB: Gamma-aminobutyric acid receptor subunit beta-2

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Macromolecule #2: Gamma-aminobutyric acid receptor subunit alpha-1

MacromoleculeName: Gamma-aminobutyric acid receptor subunit alpha-1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 48.855129 KDa
SequenceString: QPSLQDELKD NTTVFTRILD RLLDGYDNRL RPGLGERVTE VKTDIFVTSF GPVSDHDMEY TIDVFFRQSW KDERLKFKGP MTVLRLNNL MASKIWTPDT FFHNGKKSVA HNMTMPNKLL RITEDGTLLY TMRLTVRAEC PMHLEDFPMD AHACPLKFGS Y AYTRAEVV ...String:
QPSLQDELKD NTTVFTRILD RLLDGYDNRL RPGLGERVTE VKTDIFVTSF GPVSDHDMEY TIDVFFRQSW KDERLKFKGP MTVLRLNNL MASKIWTPDT FFHNGKKSVA HNMTMPNKLL RITEDGTLLY TMRLTVRAEC PMHLEDFPMD AHACPLKFGS Y AYTRAEVV YEWTREPARS VVVAEDGSRL NQYDLLGQTV DSGIVQSSTG EYVVMTTHFH LKRKIGYFVI QTYLPCIMTV IL SQVSFWL NRESVPARTV FGVTTVLTMT TLSISARNSL PKVAYATAMD WFIAVCYAFV FSALIEFATV NYFTKRGYAW DGK SVVPEK PKKVKDPLIK KNNTYAPTAT SYTPNLARGD PGLATIAKSA TIEPKEVKPE TKPPEPKKTF NSVSKIDRLS RIAF PLLFG IFNLVYWATY LNREPQLKAP TPHQ

UniProtKB: Gamma-aminobutyric acid receptor subunit alpha-1

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Macromolecule #3: Gamma-aminobutyric acid receptor subunit beta-3

MacromoleculeName: Gamma-aminobutyric acid receptor subunit beta-3 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 51.659273 KDa
SequenceString: QSVNDPGNMS FVKETVDKLL KGYDIRLRPD FGGPPVCVGM NIDIASIDMV SEVNMDYTLT MYFQQYWRDK RLAYSGIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW ...String:
QSVNDPGNMS FVKETVDKLL KGYDIRLRPD FGGPPVCVGM NIDIASIDMV SEVNMDYTLT MYFQQYWRDK RLAYSGIPLN LTLDNRVAD QLWVPDTYFL NDKKSFVHGV TVKNRMIRLH PDGTVLYGLR ITTTAACMMD LRRYPLDEQN CTLEIESYGY T TDDIEFYW RGGDKAVTGV ERIELPQFSI VEHRLVSRNV VFATGAYPRL SLSFRLKRNI GYFILQTYMP SILITILSWV SF WINYDAS AARVALGITT VLTMTTINTH LRETLPKIPY VKAIDMYLMG CFVFVFLALL EYAFVNYIFF GRGPQRQKKL AEK TAKAKN DRSKSESNRV DAHGNILLTS LEVHNEMNEV SGGIGDTRNS AISFDNSGIQ YRKQSMPREG HGRFLGDRSL PHKK THLRR RSSQLKIKIP DLTDVNAIDR WSRIVFPFTF SLFNLVYWLY YVN

UniProtKB: Gamma-aminobutyric acid receptor subunit beta-3

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Macromolecule #4: Gamma-aminobutyric acid receptor subunit alpha-2

MacromoleculeName: Gamma-aminobutyric acid receptor subunit alpha-2 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 48.011945 KDa
SequenceString: NIQEDEAKNN ITIFTRILDR LLDGYDNRLR PGLGDSITEV FTNIYVTSFG PVSDTDMEYT IDVFFRQKWK DERLKFKGPM NILRLNNLM ASKIWTPDTF FHNGKKSVAH NMTMPNKLLR IQDDGTLLYT MRLTVQAECP MHLEDFPMDA HSCPLKFGSY A YTTSEVTY ...String:
NIQEDEAKNN ITIFTRILDR LLDGYDNRLR PGLGDSITEV FTNIYVTSFG PVSDTDMEYT IDVFFRQKWK DERLKFKGPM NILRLNNLM ASKIWTPDTF FHNGKKSVAH NMTMPNKLLR IQDDGTLLYT MRLTVQAECP MHLEDFPMDA HSCPLKFGSY A YTTSEVTY IWTYNASDSV QVAPDGSRLN QYDLLGQSIG KETIKSSTGE YTVMTAHFHL KRKIGYFVIQ TYLPCIMTVI LS QVSFWLN RESVPARTVF GVTTVLTMTT LSISARNSLP KVAYATAMDW FIAVCYAFVF SALIEFATVN YFTKRGWAWD GKS VVNDKK KEKASVMIQN NAYAVAVANY APNLSKDPVL STISKSATTP EPNKKPENKP AEAKKTFNSV SKIDRMSRIV FPVL FGTFN LVYWATYLNR EPVLGVSP

UniProtKB: Gamma-aminobutyric acid receptor subunit alpha-2

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Macromolecule #5: Gamma-aminobutyric acid receptor subunit gamma-2

MacromoleculeName: Gamma-aminobutyric acid receptor subunit gamma-2 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.937402 KDa
SequenceString: QKSDDDYEDY ASNKTWVLTP KVPEGDVTVI LNNLLEGYDN KLRPDIGVKP TLIHTDMYVN SIGPVNAINM EYTIDIFFAQ TWYDRRLKF NSTIKVLRLN SNMVGKIWIP DTFFRNSKKA DAHWITTPNR MLRIWNDGRV LYTLRLTIDA ECQLQLHNFP M DEHSCPLE ...String:
QKSDDDYEDY ASNKTWVLTP KVPEGDVTVI LNNLLEGYDN KLRPDIGVKP TLIHTDMYVN SIGPVNAINM EYTIDIFFAQ TWYDRRLKF NSTIKVLRLN SNMVGKIWIP DTFFRNSKKA DAHWITTPNR MLRIWNDGRV LYTLRLTIDA ECQLQLHNFP M DEHSCPLE FSSYGYPREE IVYQWKRSSV EVGDTRSWRL YQFSFVGLRN TTEVVKTTSG DYVVMSVYFD LSRRMGYFTI QT YIPCTLI VVLSWVSFWI NKDAVPARTS LGITTVLTMT TLSTIARKSL PKVSYVTAMD LFVSVCFIFV FSALVEYGTL HYF VSNRKP SKDKDKKKKN PLLRMFSFKA PTIDIRPRSA TIQMNNATHL QERDEEYGYE CLDGKDCASF FCCFEDCRTG AWRH GRIHI RIAKMDSYAR IFFPTAFCLF NLVYWVSYLY L

UniProtKB: Gamma-aminobutyric acid receptor subunit gamma-2

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Macromolecule #6: Kappa Fab_1F4 Light Chain

MacromoleculeName: Kappa Fab_1F4 Light Chain / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.505943 KDa
Recombinant expressionOrganism: Cricetulus griseus (Chinese hamster)
SequenceString: NIVMTQSPKS MSMSVGERVT LSCKASEYVG TYVSWYQQKP EQSPKLLIYG ASNRYTGVPD RFTGSGSATD FTLTIGSVQA EDLADYHCG QSYSYPTFGA GTKLELKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK ...String:
NIVMTQSPKS MSMSVGERVT LSCKASEYVG TYVSWYQQKP EQSPKLLIYG ASNRYTGVPD RFTGSGSATD FTLTIGSVQA EDLADYHCG QSYSYPTFGA GTKLELKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK DSTYSMSSTL TLTKDEYERH NSYTCEATHK TSTSPIVKSF NRNEC

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Macromolecule #7: IgG2b Fab_1F4 Heavy Chain

MacromoleculeName: IgG2b Fab_1F4 Heavy Chain / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 49.811043 KDa
Recombinant expressionOrganism: Cricetulus griseus (Chinese hamster)
SequenceString: EVQLQQSGAE LVKPGASVKL SCTASGFNIK DTYMYWVKQR PEQGLEWIGR IDPANGDTKY DPKFQGKATI TTDTFSNTAY LQLSSLTSE DTAVYYCARK GLRWAMDYWG QGTSVTVSTA KTTPPSVYPL APGCGDTTGS SVTLGCLVKG YFPESVTVTW N SGSLSSSV ...String:
EVQLQQSGAE LVKPGASVKL SCTASGFNIK DTYMYWVKQR PEQGLEWIGR IDPANGDTKY DPKFQGKATI TTDTFSNTAY LQLSSLTSE DTAVYYCARK GLRWAMDYWG QGTSVTVSTA KTTPPSVYPL APGCGDTTGS SVTLGCLVKG YFPESVTVTW N SGSLSSSV HTFPALLQSG LYTMSSSVTV PSSTWPSQTV TCSVAHPASS TTVDKKLEPS GPISTINPCP PCKECHKCPA PN LEGGPSV FIFPPNIKDV LMISLTPKVT CVVVDVSEDD PDVQISWFVN NVEVHTAQTQ THREDYNSTI RVVSTLPIQH QDW MSGKEF KCKVNNKDLP SPIERTISKI KGLVRAPQVY ILPPPAEQLS RKDVSLTCLV VGFNPGDISV EWTSNGHTEE NYKD TAPVL DSDGSYFIYS KLNMKTSKWE KTDSFSCNVR HEGLKNYYLK KTISRSPGK

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Macromolecule #11: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 11 / Number of copies: 3 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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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 / Instrument: FEI VITROBOT MARK IV / Details: 3.5 s Blot..

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k 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: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.0 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: PDB ENTRY
PDB model - PDB ID:

6x3x

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 10975
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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