4AQ5

Gating movement in acetylcholine receptor analysed by time-resolved electron cryo-microscopy (closed class)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.20 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Gating Movement of Acetylcholine Receptor Caught by Plunge-Freezing.

Unwin, N.Fujiyoshi, Y.

(2012) J Mol Biol 422: 617

  • DOI: 10.1016/j.jmb.2012.07.010
  • Primary Citation of Related Structures:  
    4AQ5, 4AQ9

  • PubMed Abstract: 
  • The nicotinic acetylcholine (ACh) receptor converts transiently to an open-channel form when activated by ACh released into the synaptic cleft. We describe here the conformational change underlying this event, determined by electron microscopy of ACh-sprayed and freeze-trapped postsynaptic membranes ...

    The nicotinic acetylcholine (ACh) receptor converts transiently to an open-channel form when activated by ACh released into the synaptic cleft. We describe here the conformational change underlying this event, determined by electron microscopy of ACh-sprayed and freeze-trapped postsynaptic membranes. ACh binding to the α subunits triggers a concerted rearrangement in the ligand-binding domain, involving an ~1-Å outward displacement of the extracellular portion of the β subunit where it interacts with the juxtaposed ends of α-helices shaping the narrow membrane-spanning pore. The β-subunit helices tilt outward to accommodate this displacement, destabilising the arrangement of pore-lining helices, which in the closed channel bend inward symmetrically to form a central hydrophobic gate. Straightening and tangential motion of the pore-lining helices effect channel opening by widening the pore asymmetrically and increasing its polarity in the region of the gate. The pore-lining helices of the α(γ) and δ subunits, by flexing between alternative bent and straight conformations, undergo the greatest movements. This coupled allosteric transition shifts the structure from a tense (closed) state toward a more relaxed (open) state.


    Organizational Affiliation

    Department of Biophysics, Faculty of Science, Kyoto University, Oiwake, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINE RECEPTOR SUBUNIT ALPHAA, D461Torpedo marmorataMutation(s): 0 
Gene Names: CHRNA1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Acetylcholine receptor analysed by time-resolved electron cryo-microscopy (closed class)
Find proteins for P02711 (Torpedo marmorata)
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Go to UniProtKB:  P02711
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINE RECEPTOR BETA SUBUNITB493Torpedo marmorataMutation(s): 0 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Acetylcholine receptor analysed by time-resolved electron cryo-microscopy (closed class)
Find proteins for Q6S3I0 (Torpedo marmorata)
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Go to UniProtKB:  Q6S3I0
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINE RECEPTOR DELTA SUBUNITC522Torpedo marmorataMutation(s): 0 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Acetylcholine receptor analysed by time-resolved electron cryo-microscopy (closed class)
Find proteins for Q6S3H8 (Torpedo marmorata)
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Go to UniProtKB:  Q6S3H8
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINE RECEPTOR GAMMA SUBUNITE488Torpedo marmorataMutation(s): 0 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Acetylcholine receptor analysed by time-resolved electron cryo-microscopy (closed class)
Find proteins for Q6S3H9 (Torpedo marmorata)
Explore Q6S3H9 
Go to UniProtKB:  Q6S3H9
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.20 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-01
    Type: Initial release
  • Version 1.1: 2012-09-12
    Changes: Database references
  • Version 1.2: 2013-09-25
    Changes: Other
  • Version 1.3: 2017-08-30
    Changes: Data collection
  • Version 1.4: 2019-10-23
    Changes: Data collection, Other