6MXT image
Entry Detail
PDB ID:
6MXT
Title:
Crystal structure of human beta2 adrenergic receptor bound to salmeterol and Nb71
Biological Source:
PDB Version:
Deposition Date:
2018-10-31
Release Date:
2018-11-14
Method Details:
Experimental Method:
Resolution:
2.96 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Endolysin, Beta-2 adrenergic receptor chimera
Mutations:M96T, M98T, N187E
Chain IDs:A
Chain Length:472
Number of Molecules:1
Biological Source:Enterobacteria phage T4, Homo sapiens
Polymer Type:polypeptide(L)
Description:nanobody Nb71
Chain IDs:B (auth: N)
Chain Length:122
Number of Molecules:1
Biological Source:Lama glama
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
YCM A CYS modified residue
Primary Citation
Structural insights into binding specificity, efficacy and bias of a beta2AR partial agonist.
Nat. Chem. Biol. 14 1059 1066 (2018)
PMID: 30327561 DOI: 10.1038/s41589-018-0145-x

Abstact

Salmeterol is a partial agonist for the β2 adrenergic receptor (β2AR) and the first long-acting β2AR agonist to be widely used clinically for the treatment of asthma and chronic obstructive pulmonary disease. Salmeterol's safety and mechanism of action have both been controversial. To understand its unusual pharmacological action and partial agonism, we obtained the crystal structure of salmeterol-bound β2AR in complex with an active-state-stabilizing nanobody. The structure reveals the location of the salmeterol exosite, where sequence differences between β1AR and β2AR explain the high receptor-subtype selectivity. A structural comparison with the β2AR bound to the full agonist epinephrine reveals differences in the hydrogen-bond network involving residues Ser2045.43 and Asn2936.55. Mutagenesis and biophysical studies suggested that these interactions lead to a distinct active-state conformation that is responsible for the partial efficacy of G-protein activation and the limited β-arrestin recruitment for salmeterol.

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