Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 68.73 kDa 
• Atom Count: 4683 
• Residue Count: 571 
• Unique protein chains: 2

6MXT

Crystal structure of human beta2 adrenergic receptor bound to salmeterol and Nb71

• DOI: 10.2210/pdb6MXT/pdb
• Entry: 6MXT supersedes: 6CSY

• Classification: SIGNALING PROTEIN/HORMONE
• Organism(s): Escherichia virus T4, Homo sapiens, Lama glama
• Expression System: Spodoptera frugiperda, Escherichia coli
• Mutation(s): Yes 


• Deposited: 2018-10-31 Released: 2018-11-14 
• Deposition Author(s): Masureel, M., Zou, Y., Picard, L.P., van der Westhuizen, E., Mahoney, J.P., Rodrigues, J.P.G.L.M., Mildorf, T.J., Dror, R.O., Shaw, D.E., Bouvier, M., Pardon, E., Steyaert, J., Sunahara, R.K., Weis, W.I., Zhang, C., Kobilka, B.K.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.96 Å
• R-Value Free: 0.245 
• R-Value Work: 0.205 
• R-Value Observed: 0.207 

Literature

Structural insights into binding specificity, efficacy and bias of a beta2AR partial agonist.

Masureel, M., Zou, Y., Picard, L.P., van der Westhuizen, E., Mahoney, J.P., Rodrigues, J.P.G.L.M., Mildorf, T.J., Dror, R.O., Shaw, D.E., Bouvier, M., Pardon, E., Steyaert, J., Sunahara, R.K., Weis, W.I., Zhang, C., Kobilka, B.K.

(2018) Nat Chem Biol 14: 1059-1066

• PubMed: 30327561 
• DOI: 10.1038/s41589-018-0145-x
• Primary Citation of Related Structures:  
  6MXT


• PubMed Abstract: 
  

Salmeterol is a partial agonist for the β ₂ adrenergic receptor (β ₂ AR) and the first long-acting β ₂ AR 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 β ₂ AR in complex with an active-state-stabilizing nanobody. The structure reveals the location of the salmeterol exosite, where sequence differences between β ₁ AR and β ₂ AR explain the high receptor-subtype selectivity. A structural comparison with the β ₂ AR bound to the full agonist epinephrine reveals differences in the hydrogen-bond network involving residues Ser204 ^5.43 and Asn293 ^6.55 . 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.

---

Organizational Affiliation: 

Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Endolysin, Beta-2 adrenergic receptor chimera	A	472	Escherichia virus T4, Homo sapiens	Mutation(s): 3  Gene Names: E, T4Tp126 EC: 3.2.1.17
Find proteins for P07550 (Homo sapiens) Explore P07550  Go to UniProtKB:  P07550
NIH Common Fund Data Resources
PHAROS  P07550 GTEx  ENSG00000169252
Find proteins for P00720 (Enterobacteria phage T4) Explore P00720  Go to UniProtKB:  P00720

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
nanobody Nb71	N	122	Lama glama	Mutation(s): 0

Small Molecules

Ligands 7 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
K5Y	A	salmeterol C25 H37 N O4 GIIZNNXWQWCKIB-VWLOTQADSA-N
OLC	A	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate C21 H40 O4 RZRNAYUHWVFMIP-GDCKJWNLSA-N
P33	A	3,6,9,12,15,18-HEXAOXAICOSANE-1,20-DIOL C14 H30 O8 XPJRQAIZZQMSCM-UHFFFAOYSA-N
OLA	A	OLEIC ACID C18 H34 O2 ZQPPMHVWECSIRJ-KTKRTIGZSA-N
HTO	A	HEPTANE-1,2,3-TRIOL C7 H16 O3 HXYCHJFUBNTKQR-RNFRBKRXSA-N
NI	A, N	NICKEL (II) ION Ni VEQPNABPJHWNSG-UHFFFAOYSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
YCM	A	L-PEPTIDE LINKING	C5 H10 N2 O3 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.96 Å
• R-Value Free: 0.245 
• R-Value Work: 0.205 
• R-Value Observed: 0.207 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 178.682	α = 90
b = 52.589	β = 123.859
c = 125.917	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHENIX	refinement
PHASER	phasing
Coot	model building
SCALEPACK	data scaling
HKL-2000	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-10-31 
• Released Date: 2018-11-14 
Deposition Author(s): Masureel, M., Zou, Y., Picard, L.P., van der Westhuizen, E., Mahoney, J.P., Rodrigues, J.P.G.L.M., Mildorf, T.J., Dror, R.O., Shaw, D.E., Bouvier, M., Pardon, E., Steyaert, J., Sunahara, R.K., Weis, W.I., Zhang, C., Kobilka, B.K.
• This entry supersedes: 6CSY

---

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	5U19GM106990-05
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	1R35GM128641-01

Revision History 

• Version 1.0: 2018-11-14
  Type: Initial release
  
• Version 1.1: 2020-01-01
  Changes: Author supporting evidence