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Entry
Database: EMDB / ID: EMD-31157
TitleStructure of the alpha2A-adrenergic receptor GoA signaling complex bound to dexmedetomidine
Map dataStructure of dexmedetomidine bound alpha2A-adrenergic receptor GoA signaling complex
Sample
  • Complex: alpha2A-adrenergic receptor Go signaling complex
    • Complex: alpha2A-adrenergic receptor Go signaling complex
      • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
      • 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: Alpha-2A adrenergic receptor
    • Complex: scFv16
      • Protein or peptide: scFv16
  • Ligand: 4-[(1~{S})-1-(2,3-dimethylphenyl)ethyl]-1~{H}-imidazole
Keywordsalpha2A-adrenergic receptor / signaling complex / cryo-EM / MEMBRANE PROTEIN
Function / homology
Function and homology information


negative regulation of uterine smooth muscle contraction / adenylate cyclase-inhibiting adrenergic receptor signaling pathway / alpha2-adrenergic receptor activity / Adrenaline signalling through Alpha-2 adrenergic receptor / alpha-2C adrenergic receptor binding / epinephrine binding / phospholipase C-activating adrenergic receptor signaling pathway / alpha-1B adrenergic receptor binding / negative regulation of norepinephrine secretion / negative regulation of epinephrine secretion ...negative regulation of uterine smooth muscle contraction / adenylate cyclase-inhibiting adrenergic receptor signaling pathway / alpha2-adrenergic receptor activity / Adrenaline signalling through Alpha-2 adrenergic receptor / alpha-2C adrenergic receptor binding / epinephrine binding / phospholipase C-activating adrenergic receptor signaling pathway / alpha-1B adrenergic receptor binding / negative regulation of norepinephrine secretion / negative regulation of epinephrine secretion / heterotrimeric G-protein binding / negative regulation of calcium ion-dependent exocytosis / Surfactant metabolism / mu-type opioid receptor binding / positive regulation of potassium ion transport / corticotropin-releasing hormone receptor 1 binding / dopaminergic synapse / thermoception / fear response / thioesterase binding / negative regulation of insulin secretion involved in cellular response to glucose stimulus / vesicle docking involved in exocytosis / positive regulation of membrane protein ectodomain proteolysis / norepinephrine binding / Adrenoceptors / response to alcohol / intestinal absorption / G protein-coupled dopamine receptor signaling pathway / positive regulation of epidermal growth factor receptor signaling pathway / response to morphine / positive regulation of wound healing / adrenergic receptor signaling pathway / regulation of heart contraction / parallel fiber to Purkinje cell synapse / negative regulation of calcium ion transport / regulation of vasoconstriction / postsynaptic modulation of chemical synaptic transmission / negative regulation of lipid catabolic process / cellular response to hormone stimulus / Rho protein signal transduction / adenylate cyclase-activating adrenergic receptor signaling pathway / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / presynaptic active zone membrane / axon terminus / presynaptic modulation of chemical synaptic transmission / muscle contraction / guanyl-nucleotide exchange factor activity / positive regulation of cytokine production / locomotory behavior / female pregnancy / negative regulation of insulin secretion / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / postsynaptic density membrane / GABA-ergic synapse / platelet activation / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / vasodilation / 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 / adenylate cyclase-activating G protein-coupled receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / 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 / photoreceptor disc membrane / 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 / 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 / glucose homeostasis / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs)
Similarity search - Function
Alpha 2A adrenoceptor / Adrenoceptor family / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / 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 ...Alpha 2A adrenoceptor / Adrenoceptor family / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / 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 / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Alpha-2A adrenergic receptor / Guanine nucleotide-binding protein G(o) subunit alpha / 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: 3.6 Å
AuthorsXu J / Cao S
CitationJournal: Sci Adv / Year: 2022
Title: Structural insights into ligand recognition, activation, and signaling of the α adrenergic receptor.
Authors: Jun Xu / Sheng Cao / Harald Hübner / Dorothée Weikert / Geng Chen / Qiuyuan Lu / Daopeng Yuan / Peter Gmeiner / Zheng Liu / Yang Du /
Abstract: The α adrenergic receptor (αAR) is a G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptor that mediates important physiological functions in response to the endogenous ...The α adrenergic receptor (αAR) is a G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptor that mediates important physiological functions in response to the endogenous neurotransmitters norepinephrine and epinephrine, as well as numerous chemically distinct drugs. However, the molecular mechanisms of drug actions remain poorly understood. Here, we report the cryo-electron microscopy structures of the human αAR-GoA complex bound to norepinephrine and three imidazoline derivatives (brimonidine, dexmedetomidine, and oxymetazoline). Together with mutagenesis and functional data, these structures provide important insights into the molecular basis of ligand recognition, activation, and signaling at the αAR. Further structural analyses uncover different molecular determinants between αAR and βARs for recognition of norepinephrine and key regions that determine the G protein coupling selectivity. Overall, our studies provide a framework for understanding the signal transduction of the adrenergic system at the atomic level, which will facilitate rational structure-based discovery of safer and more effective medications for αAR.
History
DepositionApr 1, 2021-
Header (metadata) releaseApr 13, 2022-
Map releaseApr 13, 2022-
UpdateNov 13, 2024-
Current statusNov 13, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_31157.png

Downloads & links

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Map

FileDownload / File: emd_31157.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of dexmedetomidine bound alpha2A-adrenergic receptor GoA signaling complex
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 256 pix.
= 217.6 Å		0.85 Å/pix.
x 256 pix.
= 217.6 Å		0.85 Å/pix.
x 256 pix.
= 217.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.9
Minimum - Maximum-2.1339324 - 4.441437
Average (Standard dev.)-0.006906115 (±0.19199024)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 217.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : alpha2A-adrenergic receptor Go signaling complex

EntireName: alpha2A-adrenergic receptor Go signaling complex
Components
  • Complex: alpha2A-adrenergic receptor Go signaling complex
    • Complex: alpha2A-adrenergic receptor Go signaling complex
      • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
      • 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: Alpha-2A adrenergic receptor
    • Complex: scFv16
      • Protein or peptide: scFv16
  • Ligand: 4-[(1~{S})-1-(2,3-dimethylphenyl)ethyl]-1~{H}-imidazole

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Supramolecule #1: alpha2A-adrenergic receptor Go signaling complex

SupramoleculeName: alpha2A-adrenergic receptor Go signaling complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5

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Supramolecule #2: alpha2A-adrenergic receptor Go signaling complex

SupramoleculeName: alpha2A-adrenergic receptor Go signaling complex / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: scFv16

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

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

MacromoleculeName: Guanine nucleotide-binding protein G(o) subunit alpha / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.1005 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MGCTLSAEER AALERSKAIE KNLKEDGISA AKDVKLLLLG AGESGKSTIV KQMKIIHEDG FSGEDVKQYK PVVYSNTIQS LAAIVRAMD TLGIEYGDKE RKADAKMVCD VVSRMEDTEP FSAELLSAMM RLWGDSGIQE CFNRSREYQL NDSAKYYLDS L DRIGAADY ...String:
MGCTLSAEER AALERSKAIE KNLKEDGISA AKDVKLLLLG AGESGKSTIV KQMKIIHEDG FSGEDVKQYK PVVYSNTIQS LAAIVRAMD TLGIEYGDKE RKADAKMVCD VVSRMEDTEP FSAELLSAMM RLWGDSGIQE CFNRSREYQL NDSAKYYLDS L DRIGAADY QPTEQDILRT RVKTTGIVET HFTFKNLHFR LFDVGGQRSE RKKWIHCFED VTAIIFCVAL SGYDQVLHED ET TNRMHES LMLFDSICNN KFFIDTSIIL FLNKKDLFGE KIKKSPLTIC FPEYTGPNTY EDAAAYIQAQ FESKNRSPNK EIY CHMTCA TDTNNIQVVF DAVTDIIIAN NLRGCGLY

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

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Macromolecule #2: 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: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.402867 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: HHHHHHGSSG SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLI IWDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR F LDDNQIVT ...String:
HHHHHHGSSG SELDQLRQEA EQLKNQIRDA RKACADATLS QITNNIDPVG RIQMRTRRTL RGHLAKIYAM HWGTDSRLLV SASQDGKLI IWDSYTTNKV HAIPLRSSWV MTCAYAPSGN YVACGGLDNI CSIYNLKTRE GNVRVSRELA GHTGYLSCCR F LDDNQIVT SSGDTTCALW DIETGQQTTT FTGHTGDVMS LSLAPDTRLF VSGACDASAK LWDVREGMCR QTFTGHESDI NA ICFFPNG NAFATGSDDA TCRLFDLRAD QELMTYSHDN IICGITSVSF SKSGRLLLAG YDDFNCNVWD ALKADRAGVL AGH DNRVSC LGVTDDGMAV ATGSWDSFLK IWN

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

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Macromolecule #3: 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: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
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 #4: Alpha-2A adrenergic receptor

MacromoleculeName: Alpha-2A adrenergic receptor / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.704566 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MFRQEQPLAE GSFAPMGSLQ PDAGNASWNG TEAPGGGARA TPYSLQVTLT LVCLAGLLML LTVFGNVLVI IAVFTSRALK APQNLFLVS LASADILVAT LVIPFSLANE VMGYWYFGKA WCEIYLALDV LFCTSSIVHL CAISLDRYWS ITQAIEYNLK R TPRRIKAI ...String:
MFRQEQPLAE GSFAPMGSLQ PDAGNASWNG TEAPGGGARA TPYSLQVTLT LVCLAGLLML LTVFGNVLVI IAVFTSRALK APQNLFLVS LASADILVAT LVIPFSLANE VMGYWYFGKA WCEIYLALDV LFCTSSIVHL CAISLDRYWS ITQAIEYNLK R TPRRIKAI IITVWVISAV ISFPPLISIE KKGGGGGPQP AEPRCEINDQ KWYVISSCIG SFFAPCLIMI LVYVRIYQIA KR RTRVPPS RRGPDAVAAP PGGTERRPNG LGPERSAGPG GAEAEPLPTQ LNGAPGEPAP AGPRDTDALD LEESSSSDHA ERP PGPRRP ERGPRGKGKA RASQVKPGDS LPRRGPGATG IGTPAAGPGE ERVGAAKASR WRGRQNREKR FTFVLAVVIG VFVV CWFPF FFTYTLTAVG CSVPRTLFKF FFWFGYCNSS LNPVIYTIFN HDFRRAFKKI LCRGDRKRIV

UniProtKB: Alpha-2A adrenergic receptor

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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: 32.898781 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MLLVNQSHQG FNKEHTSKMV SAIVLYVLLA AAAHSAFADV QLVESGGGLV QPGGSRKLSC SASGFAFSSF GMHWVRQAPE KGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSEDT AMYYCVRSIY YYGSSPFDFW GQGTTLTVSS G GGGSGGGG ...String:
MLLVNQSHQG FNKEHTSKMV SAIVLYVLLA AAAHSAFADV QLVESGGGLV QPGGSRKLSC SASGFAFSSF GMHWVRQAPE KGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSEDT AMYYCVRSIY YYGSSPFDFW GQGTTLTVSS G GGGSGGGG SGGGGSDIVM TQATSSVPVT PGESVSISCR SSKSLLHSNG NTYLYWFLQR PGQSPQLLIY RMSNLASGVP DR FSGSGSG TAFTLTISRL EAEDVGVYYC MQHLEYPLTF GAGTKLELKG SLEVLFQGPA AAHHHHHHHH

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Macromolecule #6: 4-[(1~{S})-1-(2,3-dimethylphenyl)ethyl]-1~{H}-imidazole

MacromoleculeName: 4-[(1~{S})-1-(2,3-dimethylphenyl)ethyl]-1~{H}-imidazole
type: ligand / ID: 6 / Number of copies: 1 / Formula: CZX
Molecular weightTheoretical: 200.28 Da
Chemical component information

ChemComp-CZX:
4-[(1~{S})-1-(2,3-dimethylphenyl)ethyl]-1~{H}-imidazole

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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: 7.5
Sugar embeddingMaterial: vitreous ice
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: 56.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus max: 2.0 µm / Calibrated defocus min: 0.8 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.4000000000000001 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000
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: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 455506
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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