M3-mT4L receptor bound to tiotropium

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Modified T4 Lysozyme Fusion Proteins Facilitate G Protein-Coupled Receptor Crystallogenesis.

Thorsen, T.S.Matt, R.Weis, W.I.Kobilka, B.K.

(2014) Structure 22: 1657-1664

  • DOI: https://doi.org/10.1016/j.str.2014.08.022
  • Primary Citation of Related Structures:  
    4U14, 4U15, 4U16

  • PubMed Abstract: 

    G protein-coupled receptors (GPCRs) mediate the majority of cellular responses to hormones and neurotransmitters. Most GPCR crystal structures have been obtained using a fusion protein strategy where the flexible third intracellular loop is replaced by T4 lysozyme (T4L). However, wild-type T4L may not be ideally suited for all GPCRs because of its size and the inherent flexibility between the N- and C-terminal subdomains. Here we report two modified T4L variants, designed to address flexibility and size, that can be used to optimize crystal quality or promote alternative packing interactions. These variants were tested on the M3 muscarinic receptor (M3). The original M3-T4L fusion protein produced twinned crystals that yielded a 3.4 Å structure from a 70 crystal data set. We replaced T4L with the modified T4L variants. Both T4L variants yielded M3 muscarinic receptor crystals with alternate lattices that were not twinned, including one that was solved at 2.8 Å resolution.

  • Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University School of Medicine, 279 Campus Drive, Stanford, CA 94305, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Muscarinic acetylcholine receptor M3,Lysozyme,Muscarinic acetylcholine receptor M3
A, B
418Rattus norvegicusTequatrovirus T4Mutation(s): 0 
Gene Names: Chrm3Chrm-3eT4Tp126
Membrane Entity: Yes 
Find proteins for P08483 (Rattus norvegicus)
Explore P08483 
Go to UniProtKB:  P08483
Find proteins for D9IEF7 (Enterobacteria phage T4)
Explore D9IEF7 
Go to UniProtKB:  D9IEF7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP08483D9IEF7
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 0HK

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
C19 H22 N O4 S2
Query on OLC

Download Ideal Coordinates CCD File 
J [auth B],
K [auth B]
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
Query on P6G

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
F [auth A],
L [auth B]
C12 H26 O7
Query on TAR

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
M [auth B],
N [auth B]
C4 H6 O6
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.311α = 90
b = 184.563β = 98.54
c = 52.613γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
DENZOdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Benzon foundationDenmark--

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-26
    Type: Initial release
  • Version 1.1: 2014-12-24
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Database references, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references