4MQS

Structure of active human M2 muscarinic acetylcholine receptor bound to the agonist iperoxo


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Activation and allosteric modulation of a muscarinic acetylcholine receptor.

Kruse, A.C.Ring, A.M.Manglik, A.Hu, J.Hu, K.Eitel, K.Hubner, H.Pardon, E.Valant, C.Sexton, P.M.Christopoulos, A.Felder, C.C.Gmeiner, P.Steyaert, J.Weis, W.I.Garcia, K.C.Wess, J.Kobilka, B.K.

(2013) Nature 504: 101-106

  • DOI: 10.1038/nature12735
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Despite recent advances in crystallography and the availability of G-protein-coupled receptor (GPCR) structures, little is known about the mechanism of their activation process, as only the β2 adrenergic receptor (β2AR) and rhodopsin have been crysta ...

    Despite recent advances in crystallography and the availability of G-protein-coupled receptor (GPCR) structures, little is known about the mechanism of their activation process, as only the β2 adrenergic receptor (β2AR) and rhodopsin have been crystallized in fully active conformations. Here we report the structure of an agonist-bound, active state of the human M2 muscarinic acetylcholine receptor stabilized by a G-protein mimetic camelid antibody fragment isolated by conformational selection using yeast surface display. In addition to the expected changes in the intracellular surface, the structure reveals larger conformational changes in the extracellular region and orthosteric binding site than observed in the active states of the β2AR and rhodopsin. We also report the structure of the M2 receptor simultaneously bound to the orthosteric agonist iperoxo and the positive allosteric modulator LY2119620. This structure reveals that LY2119620 recognizes a largely pre-formed binding site in the extracellular vestibule of the iperoxo-bound receptor, inducing a slight contraction of this outer binding pocket. These structures offer important insights into the activation mechanism and allosteric modulation of muscarinic receptors.


    Organizational Affiliation

    1] Department of Molecular and Cellular Physiology, Stanford University School of Medicine, 279 Campus Drive, Stanford, California 94305, USA [2].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Muscarinic acetylcholine receptor M2
A
351Homo sapiensMutation(s): 6 
Gene Names: CHRM2
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs)
Protein: 
M2 human muscarinic acetylcholine receptor bound to an antagonist
Find proteins for P08172 (Homo sapiens)
Go to Gene View: CHRM2
Go to UniProtKB:  P08172
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nanobody 9-8
B
125N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IXO
Query on IXO

Download SDF File 
Download CCD File 
A
4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium
Iperoxo
C10 H17 N2 O2
WXXOCGISBCTWPW-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IXOEC50: 0.1 - 0.2 nM (84) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.249 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 62.896α = 90.00
b = 78.130β = 90.00
c = 163.482γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
PHASERphasing
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-27
    Type: Initial release
  • Version 1.1: 2013-12-04
    Type: Database references
  • Version 1.2: 2013-12-18
    Type: Database references
  • Version 1.3: 2017-07-05
    Type: Source and taxonomy