4A4M

Crystal structure of the light-activated constitutively active N2C, M257Y,D282C rhodopsin mutant in complex with a peptide resembling the C-terminus of the Galpha-protein subunit (GaCT)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

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This is version 2.1 of the entry. See complete history


Literature

Stabilized G Protein Binding Site in the Structure of Constitutively Active Metarhodopsin-II.

Deupi, X.Edwards, P.Singhal, A.Nickle, B.Oprian, D.Schertler, G.Standfuss, J.

(2012) Proc Natl Acad Sci U S A 109: 119

  • DOI: https://doi.org/10.1073/pnas.1114089108
  • Primary Citation of Related Structures:  
    4A4M

  • PubMed Abstract: 

    G protein-coupled receptors (GPCR) are seven transmembrane helix proteins that couple binding of extracellular ligands to conformational changes and activation of intracellular G proteins, GPCR kinases, and arrestins. Constitutively active mutants are ubiquitously found among GPCRs and increase the inherent basal activity of the receptor, which often correlates with a pathological outcome. Here, we have used the M257Y(6.40) constitutively active mutant of the photoreceptor rhodopsin in combination with the specific binding of a C-terminal fragment from the G protein alpha subunit (GαCT) to trap a light activated state for crystallization. The structure of the M257Y/GαCT complex contains the agonist all-trans-retinal covalently bound to the native binding pocket and resembles the G protein binding metarhodopsin-II conformation obtained by the natural activation mechanism; i.e., illumination of the prebound chromophore 11-cis-retinal. The structure further suggests a molecular basis for the constitutive activity of 6.40 substitutions and the strong effect of the introduced tyrosine based on specific interactions with Y223(5.58) in helix 5, Y306(7.53) of the NPxxY motif and R135(3.50) of the E(D)RY motif, highly conserved residues of the G protein binding site.


  • Organizational Affiliation

    Paul Scherrer Institut, Villigen PSI, 5232, Switzerland.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RHODOPSIN349Bos taurusMutation(s): 4 
Membrane Entity: Yes 
UniProt
Find proteins for P02699 (Bos taurus)
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Go to UniProtKB:  P02699
Entity Groups  
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UniProt GroupP02699
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
GUANINE NUCLEOTIDE-BINDING PROTEIN G(T) SUBUNIT ALPHA-311Bos taurusMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for P04695 (Bos taurus)
Explore P04695 
Go to UniProtKB:  P04695
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04695
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 242.19α = 90
b = 242.19β = 90
c = 109.829γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-01-25
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary