6CNK

Structure of the 3alpha2beta stiochiometry of the human Alpha4Beta2 nicotinic receptor


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report



Literature

Structural principles of distinct assemblies of the human alpha 4 beta 2 nicotinic receptor.

Walsh, R.M.Roh, S.H.Gharpure, A.Morales-Perez, C.L.Teng, J.Hibbs, R.E.

(2018) Nature 557: 261-265

  • DOI: 10.1038/s41586-018-0081-7
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Fast chemical communication in the nervous system is mediated by neurotransmitter-gated ion channels. The prototypical member of this class of cell surface receptors is the cation-selective nicotinic acetylcholine receptor. As with most ligand-gated ...

    Fast chemical communication in the nervous system is mediated by neurotransmitter-gated ion channels. The prototypical member of this class of cell surface receptors is the cation-selective nicotinic acetylcholine receptor. As with most ligand-gated ion channels, nicotinic receptors assemble as oligomers of subunits, usually as hetero-oligomers and often with variable stoichiometries 1 . This intrinsic heterogeneity in protein composition provides fine tunability in channel properties, which is essential to brain function, but frustrates structural and biophysical characterization. The α4β2 subtype of the nicotinic acetylcholine receptor is the most abundant isoform in the human brain and is the principal target in nicotine addiction. This pentameric ligand-gated ion channel assembles in two stoichiometries of α- and β-subunits (2α:3β and 3α:2β). Both assemblies are functional and have distinct biophysical properties, and an imbalance in the ratio of assemblies is linked to both nicotine addiction 2,3 and congenital epilepsy 4,5 . Here we leverage cryo-electron microscopy to obtain structures of both receptor assemblies from a single sample. Antibody fragments specific to β2 were used to 'break' symmetry during particle alignment and to obtain high-resolution reconstructions of receptors of both stoichiometries in complex with nicotine. The results reveal principles of subunit assembly and the structural basis of the distinctive biophysical and pharmacological properties of the two different stoichiometries of this receptor.


    Organizational Affiliation

    Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. ryan.hibbs@utsouthwestern.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Neuronal acetylcholine receptor subunit beta-2C, E403Homo sapiensMutation(s): 0 
Gene Names: CHRNB2
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine α4β2 Receptor, 2α3β stiochiometry
Find proteins for P17787 (Homo sapiens)
Explore P17787 
Go to UniProtKB:  P17787
NIH Common Fund Data Resources
PHAROS  P17787
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
IgG1 Kappa Light ChainF, J238Mus musculusMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
IgG1 Heavy ChainG, K462Mus musculusMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Neuronal acetylcholine receptor subunit alpha-4A, B, D386Homo sapiensMutation(s): 0 
Gene Names: CHRNA4NACRA4
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine α4β2 Receptor, 2α3β stiochiometry
Find proteins for P43681 (Homo sapiens)
Explore P43681 
Go to UniProtKB:  P43681
NIH Common Fund Data Resources
PHAROS  P43681
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Oligosaccharides
Entity ID: 5
MoleculeChainsChain Length2D Diagram Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
H, I
3 N-Glycosylation
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Y01
Query on Y01

Download CCD File 
A, B, C, D, E
CHOLESTEROL HEMISUCCINATE
C31 H50 O4
WLNARFZDISHUGS-MIXBDBMTSA-N
 Ligand Interaction
NAG
Query on NAG

Download CCD File 
A, B, D
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
NCT
Query on NCT

Download CCD File 
A, B, D
(S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE
C10 H14 N2
SNICXCGAKADSCV-JTQLQIEISA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesNS095899
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)United StatesDA037492
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)United StatesDA042072

Revision History 

  • Version 1.0: 2018-05-02
    Type: Initial release
  • Version 1.1: 2018-05-09
    Changes: Data collection, Structure summary
  • Version 1.2: 2018-05-16
    Changes: Data collection, Database references
  • Version 1.3: 2018-05-30
    Changes: Data collection, Database references
  • Version 1.4: 2018-07-18
    Changes: Data collection
  • Version 1.5: 2019-11-20
    Changes: Data collection, Database references
  • Version 1.6: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.7: 2019-12-18
    Changes: Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary