4BWB

Structure of Evolved Agonist-bound Neurotensin Receptor 1 Mutant without Lysozyme Fusion

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.57 Å
  • R-Value Free: 0.345 
  • R-Value Work: 0.309 
  • R-Value Observed: 0.311 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure of Signaling-Competent Neurotensin Receptor 1 Obtained by Directed Evolution in Escherichia Coli

Egloff, P., Hillenbrand, M., Klenk, C., Batyuk, A., Heine, P., Balada, S., Schlinkmann, K.M., Scott, D.J., Schuetz, M., Plueckthun, A.

(2014) Proc Natl Acad Sci U S A 111: E655

  • DOI: 10.1073/pnas.1317903111
  • Primary Citation of Related Structures:  
    4BUO, 4BV0, 4BWB, 3ZEV

  • PubMed Abstract: 

    • Crystallography has advanced our understanding of G protein-coupled receptors, but low expression levels and instability in solution have limited structural insights to very few selected members of this large protein family. Using neurotensin recepto ...

    Crystallography has advanced our understanding of G protein-coupled receptors, but low expression levels and instability in solution have limited structural insights to very few selected members of this large protein family. Using neurotensin receptor 1 (NTR1) as a proof of principle, we show that two directed evolution technologies that we recently developed have the potential to overcome these problems. We purified three neurotensin-bound NTR1 variants from Escherichia coli and determined their X-ray structures at up to 2.75 Å resolution using vapor diffusion crystallization experiments. A crystallized construct was pharmacologically characterized and exhibited ligand-dependent signaling, internalization, and wild-type-like agonist and antagonist affinities. Our structures are fully consistent with all biochemically defined ligand-contacting residues, and they represent an inactive NTR1 state at the cytosolic side. They exhibit significant differences to a previously determined NTR1 structure (Protein Data Bank ID code 4GRV) in the ligand-binding pocket and by the presence of the amphipathic helix 8. A comparison of helix 8 stability determinants between NTR1 and other crystallized G protein-coupled receptors suggests that the occupancy of the canonical position of the amphipathic helix is reduced to various extents in many receptors, and we have elucidated the sequence determinants for a stable helix 8. Our analysis also provides a structural rationale for the long-known effects of C-terminal palmitoylation reactions on G protein-coupled receptor signaling, receptor maturation, and desensitization.

    Organizational Affiliation: 

    Department of Biochemistry, University of Zurich, 8057 Zurich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NEUROTENSIN RECEPTOR TYPE 1A, B338Rattus norvegicusMutation(s): 26 
Gene Names: Ntsr1, Ntsr
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors (GPCRs): Class A		Protein: 
NTS1 neurotensin receptor produced by direct evolution, agonist bound (TM86V-ΔIC3B mutant)
Find proteins for P20789 (Rattus norvegicus)
Explore P20789 
Go to UniProtKB:  P20789
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NEUROTENSINC, D10Rattus norvegicusMutation(s): 0 
Gene Names: Nts
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors (GPCRs): Class A		Protein: 
NTS1 neurotensin receptor produced by direct evolution, agonist bound (TM86V-ΔIC3B mutant)
Find proteins for P20068 (Rattus norvegicus)
Explore P20068 
Go to UniProtKB:  P20068
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.57 Å
  • R-Value Free: 0.345 
  • R-Value Work: 0.309 
  • R-Value Observed: 0.311 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.88α = 90
b = 90.89β = 90
c = 211.01γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-29
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Database references
  • Version 1.2: 2014-02-26
    Changes: Database references