5JQH

Structure of beta2 adrenoceptor bound to carazolol and inactive-state stabilizing nanobody, Nb60


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Allosteric nanobodies reveal the dynamic range and diverse mechanisms of G-protein-coupled receptor activation.

Staus, D.P.Strachan, R.T.Manglik, A.Pani, B.Kahsai, A.W.Kim, T.H.Wingler, L.M.Ahn, S.Chatterjee, A.Masoudi, A.Kruse, A.C.Pardon, E.Steyaert, J.Weis, W.I.Prosser, R.S.Kobilka, B.K.Costa, T.Lefkowitz, R.J.

(2016) Nature 535: 448-452

  • DOI: 10.1038/nature18636

  • PubMed Abstract: 
  • G-protein-coupled receptors (GPCRs) modulate many physiological processes by transducing a variety of extracellular cues into intracellular responses. Ligand binding to an extracellular orthosteric pocket propagates conformational change to the recep ...

    G-protein-coupled receptors (GPCRs) modulate many physiological processes by transducing a variety of extracellular cues into intracellular responses. Ligand binding to an extracellular orthosteric pocket propagates conformational change to the receptor cytosolic region to promote binding and activation of downstream signalling effectors such as G proteins and β-arrestins. It is well known that different agonists can share the same binding pocket but evoke unique receptor conformations leading to a wide range of downstream responses (‘efficacy’). Furthermore, increasing biophysical evidence, primarily using the β2-adrenergic receptor (β2AR) as a model system, supports the existence of multiple active and inactive conformational states. However, how agonists with varying efficacy modulate these receptor states to initiate cellular responses is not well understood. Here we report stabilization of two distinct β2AR conformations using single domain camelid antibodies (nanobodies)—a previously described positive allosteric nanobody (Nb80) and a newly identified negative allosteric nanobody (Nb60). We show that Nb60 stabilizes a previously unappreciated low-affinity receptor state which corresponds to one of two inactive receptor conformations as delineated by X-ray crystallography and NMR spectroscopy. We find that the agonist isoprenaline has a 15,000-fold higher affinity for β2AR in the presence of Nb80 compared to the affinity of isoprenaline for β2AR in the presence of Nb60, highlighting the full allosteric range of a GPCR. Assessing the binding of 17 ligands of varying efficacy to the β2AR in the absence and presence of Nb60 or Nb80 reveals large ligand-specific effects that can only be explained using an allosteric model which assumes equilibrium amongst at least three receptor states. Agonists generally exert efficacy by stabilizing the active Nb80-stabilized receptor state (R80). In contrast, for a number of partial agonists, both stabilization of R80 and destabilization of the inactive, Nb60-bound state (R60) contribute to their ability to modulate receptor activation. These data demonstrate that ligands can initiate a wide range of cellular responses by differentially stabilizing multiple receptor states.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Endolysin,Beta-2 adrenergic receptor
A, B
471Enterobacteria phage T4Homo sapiens
This entity is chimeric
Mutation(s): 6 
Gene Names: E, ADRB2 (ADRB2R, B2AR)
EC: 3.2.1.17
Find proteins for P00720 (Enterobacteria phage T4)
Go to UniProtKB:  P00720
Find proteins for P07550 (Homo sapiens)
Go to Gene View: ADRB2
Go to UniProtKB:  P07550
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nanobody60, Nb60
D, C
125N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CAU
Query on CAU

Download SDF File 
Download CCD File 
A, B
(2S)-1-(9H-Carbazol-4-yloxy)-3-(isopropylamino)propan-2-ol
(S)-Carazolol
C18 H22 N2 O2
BQXQGZPYHWWCEB-ZDUSSCGKSA-N
 Ligand Interaction
CLR
Query on CLR

Download SDF File 
Download CCD File 
A, B
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.246 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 43.924α = 90.00
b = 164.486β = 90.00
c = 218.749γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
PHENIXphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesHL70631
National Institutes of Health/National Institute of Neurological Disorders and StrokeUnited StatesNS028471

Revision History 

  • Version 1.0: 2016-07-13
    Type: Initial release
  • Version 1.1: 2016-07-27
    Type: Database references
  • Version 1.2: 2016-08-03
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Database references, Derived calculations