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- EMDB-31031: Cryo-EM structure of Gi-bound metabotropic glutamate receptor mGlu2 -

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Basic information

Entry
Database: EMDB / ID: EMD-31031
TitleCryo-EM structure of Gi-bound metabotropic glutamate receptor mGlu2
Map data
Sample
  • Complex: Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in presence of antibodies
    • Protein or peptide: Metabotropic glutamate receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • 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
    • Protein or peptide: DN13
  • Ligand: (1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid
  • Ligand: 1-butyl-3-chloranyl-4-(4-phenylpiperidin-1-yl)pyridin-2-one
Function / homology
Function and homology information


regulation of response to drug / group II metabotropic glutamate receptor activity / behavioral response to nicotine / G protein-coupled glutamate receptor signaling pathway / intracellular glutamate homeostasis / astrocyte projection / negative regulation of adenylate cyclase activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate secretion / glutamate receptor activity ...regulation of response to drug / group II metabotropic glutamate receptor activity / behavioral response to nicotine / G protein-coupled glutamate receptor signaling pathway / intracellular glutamate homeostasis / astrocyte projection / negative regulation of adenylate cyclase activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate secretion / glutamate receptor activity / regulation of glutamate secretion / long-term synaptic depression / regulation of dopamine secretion / calcium channel regulator activity / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding / regulation of mitotic spindle organization / cellular response to forskolin / regulation of synaptic transmission, glutamatergic / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / presynaptic modulation of chemical synaptic transmission / response to cocaine / Regulation of insulin secretion / G protein-coupled receptor binding / G protein-coupled receptor activity / 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 / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein activation / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Sensory perception of sweet, bitter, and umami (glutamate) taste / response to peptide hormone / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / adenylate cyclase-activating dopamine receptor signaling pathway / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / sensory perception of taste / GPER1 signaling / GDP binding / G-protein beta-subunit binding / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / extracellular vesicle / G alpha (12/13) signalling events / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / presynaptic membrane / Ca2+ pathway / gene expression / phospholipase C-activating G protein-coupled receptor signaling pathway / cell cortex / midbody / G alpha (i) signalling events / fibroblast proliferation / chemical synaptic transmission / G alpha (s) signalling events / scaffold protein binding / G alpha (q) signalling events / Ras protein signal transduction / cell population proliferation / Extra-nuclear estrogen signaling / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / cell cycle / G protein-coupled receptor signaling pathway / cell division / lysosomal membrane / axon / GTPase activity / centrosome / dendrite / glutamatergic synapse / synapse / protein-containing complex binding / GTP binding
Similarity search - Function
GPCR, family 3, metabotropic glutamate receptor 2 / 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 ...GPCR, family 3, metabotropic glutamate receptor 2 / 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 / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / G-protein coupled receptors family 3 profile. / G-protein alpha subunit, group I / Receptor, ligand binding region / Receptor family ligand binding region / G-alpha domain profile. / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G protein alpha subunit / Periplasmic binding protein-like I / G-protein, gamma subunit / G-protein gamma subunit domain profile. / GGL domain / G-protein gamma-like domain superfamily / G-protein gamma-like domain / GGL domain / G protein gamma subunit-like motifs / 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. / WD domain, G-beta repeat / WD40 repeats / WD40 repeat / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / 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)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Metabotropic glutamate receptor 2
Similarity search - Component
Biological speciesHomo sapiens (human) / Lama glama (llama)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsLin S / Han S / Zhao Q / Wu B
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-
UpdateAug 4, 2021-
Current statusAug 4, 2021Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.022
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.022
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7e9g
  • Surface level: 0.022
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_31031.png

Downloads & links

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Map

FileDownload / File: emd_31031.map.gz / Format: CCP4 / Size: 220.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.045 Å
Density
Contour LevelBy AUTHOR: 0.022 / Movie #1: 0.022
Minimum - Maximum-0.04291166 - 0.17656678
Average (Standard dev.)0.00041480578 (±0.0021717504)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions382390388
Spacing390382388
CellA: 407.55 Å / B: 399.18997 Å / C: 405.46 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0451.0451.045
M x/y/z390382388
origin x/y/z0.0000.0000.000
length x/y/z407.550399.190405.460
α/β/γ90.00090.00090.000
start NX/NY/NZ192139186
NX/NY/NZ211274246
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS390382388
D min/max/mean-0.0430.1770.000

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Supplemental data

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Sample components

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Entire : Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in pre...

EntireName: Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in presence of antibodies
Components
  • Complex: Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in presence of antibodies
    • Protein or peptide: Metabotropic glutamate receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • 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
    • Protein or peptide: DN13
  • Ligand: (1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid
  • Ligand: 1-butyl-3-chloranyl-4-(4-phenylpiperidin-1-yl)pyridin-2-one

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Supramolecule #1: Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in pre...

SupramoleculeName: Complex of mGlu2 homodimer with heterotrimeric Gi1 protein in presence of antibodies
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM

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Macromolecule #1: Metabotropic glutamate receptor 2

MacromoleculeName: Metabotropic glutamate receptor 2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 90.240281 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: DYKDDDDGAP EGPAKKVLTL EGDLVLGGLF PVHQKGGPAE DCGPVNEHRG IQRLEAMLFA LDRINRDPHL LPGVRLGAHI LDSCSKDTH ALEQALDFVR ASLSRGADGS RHICPDGSYA THGDAPTAIT GVIGGSYSDV SIQVANLLRL FQIPQISYAS T SAKLSDKS ...String:
DYKDDDDGAP EGPAKKVLTL EGDLVLGGLF PVHQKGGPAE DCGPVNEHRG IQRLEAMLFA LDRINRDPHL LPGVRLGAHI LDSCSKDTH ALEQALDFVR ASLSRGADGS RHICPDGSYA THGDAPTAIT GVIGGSYSDV SIQVANLLRL FQIPQISYAS T SAKLSDKS RYDYFARTVP PDFFQAKAMA EILRFFNWTY VSTVASEGDY GETGIEAFEL EARARNICVA TSEKVGRAMS RA AFEGVVR ALLQKPSARV AVLFTRSEDA RELLAASQRL NASFTWVASD GWGALESVVA GSEGAAEGAI TIELASYPIS DFA SYFQSL DPWNNSRNPW FREFWEQRFR CSFRQRDCAA HSLRAVPFEQ ESKIMFVVNA VYAMAHALHN MHRALCPNTT RLCD AMRPV NGRRLYKDFV LNVKFDAPFR PADTHNEVRF DRFGDGIGRY NIFTYLRAGS GRYRYQKVGY WAEGLTLDTS LIPWA SPSA GPLPASRCSE PCLQNEVKSV QPGEVCCWLC IPCQPYEYRL DEFTCADCGL GYWPNASLTG CFELPQEYIR WGDAWA VGP VTIACLGALA TLFVLGVFVR HNATPVVKAA GRELCYILLG GVFLCYCMTF IFIAKPSTAV CTLRRLGLGT AFSVCYS AL LTKTNRIARI FGGAREGAQR PRFISPASQV AICLALISGQ LLIVVAWLVV EAPGTGKETA PERREVVTLR CNHRDASM L GSLAYNVLLI ALCTLYAFKT RKCPENFNEA KFIGFTMYTT CIIWLAFLPI FYVTSSDYRV QTTTMCVSVS LSGSVVLGC LFAPKLHIIL FQPQKNV

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Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.414047 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKDCGLF

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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

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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

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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: DN13

MacromoleculeName: DN13 / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Lama glama (llama)
Molecular weightTheoretical: 13.637166 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
QVQLVQSGGG LVQAGGSLRL SCAASVRFFS INTMGWYRQA PGKQRELVAD ITSSGSTNYA DSGKGRFTIS RDNAKNTVYL QMNRLKPED TAVYYCHADY KYTTHNTAWG QGTQVTVSSL EVLFQ

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Macromolecule #7: (1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid

MacromoleculeName: (1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid
type: ligand / ID: 7 / Number of copies: 2 / Formula: 40F
Molecular weightTheoretical: 185.177 Da
Chemical component information

ChemComp-40F:
(1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid / Eglumetad

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Macromolecule #8: 1-butyl-3-chloranyl-4-(4-phenylpiperidin-1-yl)pyridin-2-one

MacromoleculeName: 1-butyl-3-chloranyl-4-(4-phenylpiperidin-1-yl)pyridin-2-one
type: ligand / ID: 8 / Number of copies: 1 / Formula: HZR
Molecular weightTheoretical: 344.878 Da
Chemical component information

ChemComp-HZR:
1-butyl-3-chloranyl-4-(4-phenylpiperidin-1-yl)pyridin-2-one / ADX-71149

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

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Image processing

Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 850700

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