6WJC

Muscarinic acetylcholine receptor 1 - muscarinic toxin 7 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.245 

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Literature

Structure and selectivity engineering of the M1muscarinic receptor toxin complex.

Maeda, S.Xu, J.N Kadji, F.M.Clark, M.J.Zhao, J.Tsutsumi, N.Aoki, J.Sunahara, R.K.Inoue, A.Garcia, K.C.Kobilka, B.K.

(2020) Science 369: 161-167

  • DOI: 10.1126/science.aax2517
  • Primary Citation of Related Structures:  
    6WJC

  • PubMed Abstract: 
  • Muscarinic toxins (MTs) are natural toxins produced by mamba snakes that primarily bind to muscarinic acetylcholine receptors (MAChRs) and modulate their function. Despite their similar primary and tertiary structures, MTs show distinct binding selectivity toward different MAChRs ...

    Muscarinic toxins (MTs) are natural toxins produced by mamba snakes that primarily bind to muscarinic acetylcholine receptors (MAChRs) and modulate their function. Despite their similar primary and tertiary structures, MTs show distinct binding selectivity toward different MAChRs. The molecular details of how MTs distinguish MAChRs are not well understood. Here, we present the crystal structure of M 1 AChR in complex with MT7, a subtype-selective anti-M 1 AChR snake venom toxin. The structure reveals the molecular basis of the extreme subtype specificity of MT7 for M 1 AChR and the mechanism by which it regulates receptor function. Through in vitro engineering of MT7 finger regions that was guided by the structure, we have converted the selectivity from M 1 AChR toward M 2 AChR, suggesting that the three-finger fold is a promising scaffold for developing G protein-coupled receptor modulators.


    Organizational Affiliation

    Beijing Advanced Innovation Center for Structural Biology, School of Life Science, Tsinghua University, Beijing, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Muscarinic acetylcholine receptor M1,Endolysin fusionA499Homo sapiensEscherichia virus T4Mutation(s): 0 
Gene Names: CHRM1eT4Tp126
EC: 3.2.1.17
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P11229 (Homo sapiens)
Explore P11229 
Go to UniProtKB:  P11229
PHAROS:  P11229
Find proteins for D9IEF7 (Enterobacteria phage T4)
Explore D9IEF7 
Go to UniProtKB:  D9IEF7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Muscarinic toxin 7B [auth C]69Dendroaspis angusticepsMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q8QGR0 (Dendroaspis angusticeps)
Explore Q8QGR0 
Go to UniProtKB:  Q8QGR0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Y01 (Subject of Investigation/LOI)
Query on Y01

Download Ideal Coordinates CCD File 
D [auth A], E [auth A], F [auth A], G [auth A]CHOLESTEROL HEMISUCCINATE
C31 H50 O4
WLNARFZDISHUGS-MIXBDBMTSA-N
 Ligand Interaction
OIN (Subject of Investigation/LOI)
Query on OIN

Download Ideal Coordinates CCD File 
H [auth A](1R,5S)-8-METHYL-8-AZABICYCLO[3.2.1]OCT-3-YL (2R)-3-HYDROXY-2-PHENYLPROPANOATE
C17 H23 N O3
RKUNBYITZUJHSG-QKPAOTATSA-N
 Ligand Interaction
ACM
Query on ACM

Download Ideal Coordinates CCD File 
C [auth A]ACETAMIDE
C2 H5 N O
DLFVBJFMPXGRIB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.245 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.148α = 90
b = 150.429β = 98.77
c = 76.927γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM083118

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-08
    Type: Initial release
  • Version 1.1: 2020-07-22
    Changes: Database references