6IIV

Crystal structure of the human thromboxane A2 receptor bound to daltroban


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.212 

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Literature

Structural basis for ligand recognition of the human thromboxane A2receptor.

Fan, H.Chen, S.Yuan, X.Han, S.Zhang, H.Xia, W.Xu, Y.Zhao, Q.Wu, B.

(2019) Nat Chem Biol 15: 27-33

  • DOI: 10.1038/s41589-018-0170-9
  • Primary Citation of Related Structures:  
    6IIV, 6IIU

  • PubMed Abstract: 
  • Stimulated by thromboxane A 2 , an endogenous arachidonic acid metabolite, the thromboxane A 2 receptor (TP) plays a pivotal role in cardiovascular homeostasis, and thus is considered as an important drug target for cardiovascular disease ...

    Stimulated by thromboxane A 2 , an endogenous arachidonic acid metabolite, the thromboxane A 2 receptor (TP) plays a pivotal role in cardiovascular homeostasis, and thus is considered as an important drug target for cardiovascular disease. Here, we report crystal structures of the human TP bound to two nonprostanoid antagonists, ramatroban and daltroban, at 2.5 Å and 3.0 Å resolution, respectively. The TP structures reveal a ligand-binding pocket capped by two layers of extracellular loops that are stabilized by two disulfide bonds, limiting ligand access from the extracellular milieu. These structures provide details of interactions between the receptor and antagonists, which help to integrate previous mutagenesis and SAR data. Molecular docking of prostanoid-like ligands, combined with mutagenesis, ligand-binding and functional assays, suggests a prostanoid binding mode that may also be adopted by other prostanoid receptors. These insights into TP deepen our understanding about ligand recognition and selectivity mechanisms of this physiologically important receptor.


    Organizational Affiliation

    CAS Center for Excellence in Biomacromolecules, Chinese Academy of Sciences, Beijing, China. beiliwu@simm.ac.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Soluble cytochrome b562,Thromboxane A2 receptor,Rubredoxin,Thromboxane A2 receptorA484Escherichia coliHomo sapiensClostridium pasteurianumMutation(s): 4 
Gene Names: cybCTBXA2R
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P0ABE7 (Escherichia coli)
Explore P0ABE7 
Go to UniProtKB:  P0ABE7
Find proteins for P00268 (Clostridium pasteurianum)
Explore P00268 
Go to UniProtKB:  P00268
Find proteins for P21731 (Homo sapiens)
Explore P21731 
Go to UniProtKB:  P21731
PHAROS:  P21731
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CLR (Subject of Investigation/LOI)
Query on CLR

Download Ideal Coordinates CCD File 
D [auth A]CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
 Ligand Interaction
A90 (Subject of Investigation/LOI)
Query on A90

Download Ideal Coordinates CCD File 
B [auth A]2-[4-[2-[(4-chlorophenyl)sulfonylamino]ethyl]phenyl]ethanoic acid
C16 H16 Cl N O4 S
IULOBWFWYDMECP-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
E [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.212 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.53α = 90
b = 152.17β = 90
c = 125.22γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-10-07 
  • Released Date: 2018-12-19 
  • Deposition Author(s): Fan, H., Zhao, Q., Wu, B.

Funding OrganizationLocationGrant Number
Chinese Academy of SciencesChinaQYZDB-SSW-SMC024

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Data collection, Database references