4AQ5

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.2 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.3 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:  

  • 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 ...

    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

    MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK. unwin@mrc-lmb.cam.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE RECEPTOR SUBUNIT ALPHA
A, D
461Torpedo marmorataMutation(s): 0 
Gene Names: CHRNA1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine Receptor Pore (closed state)
Find proteins for P02711 (Torpedo marmorata)
Go to Gene View: CHRNA1
Go to UniProtKB:  P02711
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE RECEPTOR BETA SUBUNIT
B
493Torpedo marmorataMutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine Receptor Pore (closed state)
Find proteins for Q6S3I0 (Torpedo marmorata)
Go to UniProtKB:  Q6S3I0
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE RECEPTOR DELTA SUBUNIT
C
522Torpedo marmorataMutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine Receptor Pore (closed state)
Find proteins for Q6S3H8 (Torpedo marmorata)
Go to UniProtKB:  Q6S3H8
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINE RECEPTOR GAMMA SUBUNIT
E
488Torpedo marmorataMutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Nicotinic Acetylcholine Receptor Pore (closed state)
Find proteins for Q6S3H9 (Torpedo marmorata)
Go to UniProtKB:  Q6S3H9
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.2 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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