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- PDB-7ymj: Cryo-EM structure of alpha1AAR-Nb6 complex bound to tamsulosin -

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Basic information

Entry
Database: PDB / ID: 7ymj
TitleCryo-EM structure of alpha1AAR-Nb6 complex bound to tamsulosin
Components
  • Nb6
  • alpha1A-adrenergic receptor
KeywordsMEMBRANE PROTEIN / GPCR / Nanobody / Antagonist / Complex
Function / homologyTamsulosin
Function and homology information
Biological speciesHomo sapiens (human)
Lama glama (llama)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsToyoda, Y. / Zhu, A. / Yan, C. / Kobilka, B.K. / Liu, X.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32122041 China
CitationJournal: Nat Commun / Year: 2023
Title: Structural basis of α-adrenergic receptor activation and recognition by an extracellular nanobody.
Authors: Yosuke Toyoda / Angqi Zhu / Fang Kong / Sisi Shan / Jiawei Zhao / Nan Wang / Xiaoou Sun / Linqi Zhang / Chuangye Yan / Brian K Kobilka / Xiangyu Liu /
Abstract: The αadrenergic receptor (αAR) belongs to the family of G protein-coupled receptors that respond to adrenaline and noradrenaline. αAR is involved in smooth muscle contraction and cognitive ...The αadrenergic receptor (αAR) belongs to the family of G protein-coupled receptors that respond to adrenaline and noradrenaline. αAR is involved in smooth muscle contraction and cognitive function. Here, we present three cryo-electron microscopy structures of human αAR bound to the endogenous agonist noradrenaline, its selective agonist oxymetazoline, and the antagonist tamsulosin, with resolutions range from 2.9 Å to 3.5 Å. Our active and inactive αAR structures reveal the activation mechanism and distinct ligand binding modes for noradrenaline compared with other adrenergic receptor subtypes. In addition, we identified a nanobody that preferentially binds to the extracellular vestibule of αAR when bound to the selective agonist oxymetazoline. These results should facilitate the design of more selective therapeutic drugs targeting both orthosteric and allosteric sites in this receptor family.
History
DepositionJul 28, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 5, 2023Provider: repository / Type: Initial release
Revision 1.1Oct 30, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: alpha1A-adrenergic receptor
D: Nb6
hetero molecules


Theoretical massNumber of molelcules
Total (without water)57,7283
Polymers57,3202
Non-polymers4091
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein alpha1A-adrenergic receptor


Mass: 40804.180 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#2: Antibody Nb6


Mass: 16515.590 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Lama glama (llama) / Production host: Escherichia coli (E. coli)
#3: Chemical ChemComp-JGX / Tamsulosin


Mass: 408.512 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H28N2O5S / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1alpha1AAR-Nb6 complexCOMPLEX#1-#20RECOMBINANT
2alpha1AARCOMPLEX#11RECOMBINANT
3Nb6COMPLEX#21RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Lama glama (llama)9844
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Spodoptera frugiperda (fall armyworm)7108
23Escherichia coli (E. coli)562
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1300 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.14_3247: / Classification: refinement
EM software
IDNameCategory
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
CTF correctionType: NONE
3D reconstructionResolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 285000 / Symmetry type: POINT

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