6IBL

ACTIVATED TURKEY BETA1 ADRENOCEPTOR WITH BOUND AGONIST FORMOTEROL AND NANOBODY Nb80

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Molecular basis of beta-arrestin coupling to formoterol-bound beta1-adrenoceptor.

Lee, Y., Warne, T., Nehme, R., Pandey, S., Dwivedi-Agnihotri, H., Chaturvedi, M., Edwards, P.C., Garcia-Nafria, J., Leslie, A.G.W., Shukla, A.K., Tate, C.G.

(2020) Nature 583: 862-866

  • DOI: 10.1038/s41586-020-2419-1
  • Primary Citation of Related Structures:  
    6TKO, 6IBL

  • PubMed Abstract: 

    • The β 1 -adrenoceptor (β 1 AR) is a G-protein-coupled receptor (GPCR) that couples 1 to the heterotrimeric G protein G s . G-protein-mediated signalling is terminated by phosphorylation of the C terminus o ...

    The β 1 -adrenoceptor (β 1 AR) is a G-protein-coupled receptor (GPCR) that couples 1 to the heterotrimeric G protein G s . G-protein-mediated signalling is terminated by phosphorylation of the C terminus of the receptor by GPCR kinases (GRKs) and by coupling of β-arrestin 1 (βarr1, also known as arrestin 2), which displaces G s and induces signalling through the MAP kinase pathway 2 . The ability of synthetic agonists to induce signalling preferentially through either G proteins or arrestins-known as biased agonism 3 -is important in drug development, because the therapeutic effect may arise from only one signalling cascade, whereas the other pathway may mediate undesirable side effects 4 . To understand the molecular basis for arrestin coupling, here we determined the cryo-electron microscopy structure of the β 1 AR-βarr1 complex in lipid nanodiscs bound to the biased agonist formoterol 5 , and the crystal structure of formoterol-bound β 1 AR coupled to the G-protein-mimetic nanobody 6 Nb80. βarr1 couples to β 1 AR in a manner distinct to that 7 of G s coupling to β 2 AR-the finger loop of βarr1 occupies a narrower cleft on the intracellular surface, and is closer to transmembrane helix H7 of the receptor when compared with the C-terminal α5 helix of G s . The conformation of the finger loop in βarr1 is different from that adopted by the finger loop of visual arrestin when it couples to rhodopsin 8 . β 1 AR coupled to βarr1 shows considerable differences in structure compared with β 1 AR coupled to Nb80, including an inward movement of extracellular loop 3 and the cytoplasmic ends of H5 and H6. We observe weakened interactions between formoterol and two serine residues in H5 at the orthosteric binding site of β 1 AR, and find that formoterol has a lower affinity for the β 1 AR-βarr1 complex than for the β 1 AR-G s complex. The structural differences between these complexes of β 1 AR provide a foundation for the design of small molecules that could bias signalling in the β-adrenoceptors.

    Related Citations: 
    • Molecular basis for high affinity agonist binding in GPCRs
      Warne, T., Edwards, P.C., Dore, A.S., Leslie, A.G.W., Tate, C.G.
      (2018) Biorxiv --: --
    Organizational Affiliation: 

    MRC Laboratory of Molecular Biology, Cambridge, UK. cgt@mrc-lmb.cam.ac.uk.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thioredoxin 1,Beta-1 adrenergic receptorA, B416Escherichia coli K-12, Meleagris gallopavo
This entity is chimeric		Mutation(s): 6 
Gene Names: trxA, fipA, tsnC, b3781, JW5856
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors (GPCRs): Class A		Protein: 
β1 adrenoceptor with bound agonist formoterol coupled to arrestin-2 in lipid nanodisc
Find proteins for P07700 (Meleagris gallopavo)
Explore P07700 
Go to UniProtKB:  P07700
Find proteins for P0AA25 (Escherichia coli (strain K12))
Explore P0AA25 
Go to UniProtKB:  P0AA25
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Camelid antibody fragment Nb80C, D121Lama glamaMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.65α = 90
b = 121.12β = 90
c = 129.84γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
Aimlessdata scaling
REFMACphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2019-01-09
    Type: Initial release
  • Version 1.1: 2019-05-22
    Changes: Data collection, Database references
  • Version 1.2: 2020-07-08
    Changes: Database references
  • Version 1.3: 2020-08-12
    Changes: Database references, Derived calculations