3TZM

TGF-beta Receptor type 1 in complex with SB431542


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural Basis for Specificity of TGFbeta Family Receptor Small Molecule Inhibitors

Ogunjimi, A.A.Zeqiraj, E.Ceccarelli, D.F.Sicheri, F.Wrana, J.L.David, L.

(2012) Cell Signal 24: 476-483

  • DOI: 10.1016/j.cellsig.2011.09.027

  • PubMed Abstract: 
  • Transforming growth factor-β (TGFβ) receptor kinase inhibitors have a great therapeutic potential. SB431542 is one of the mainly used kinase inhibitors of the TGFβ/Activin pathway receptors, but needs improvement of its EC(50) (EC(50)=1 μM) to be tra ...

    Transforming growth factor-β (TGFβ) receptor kinase inhibitors have a great therapeutic potential. SB431542 is one of the mainly used kinase inhibitors of the TGFβ/Activin pathway receptors, but needs improvement of its EC(50) (EC(50)=1 μM) to be translated to clinical use. A key feature of SB431542 is that it specifically targets receptors from the TGFβ/Activin pathway but not the closely related receptors from the bone morphogenic proteins (BMP) pathway. To understand the mechanisms of this selectivity, we solved the crystal structure of the TGFβ type I receptor (TβRI) kinase domain in complex with SB431542. We mutated TβRI residues coordinating SB431542 to their counterparts in activin-receptor like kinase 2 (ALK2), a BMP receptor kinase, and tested the kinase activity of mutated TβRI. We discovered that a Ser280Thr mutation yielded a TβRI variant that was resistant to SB431542 inhibition. Furthermore, the corresponding Thr283Ser mutation in ALK2 yielded a BMP receptor sensitive to SB431542. This demonstrated that Ser280 is the key determinant of selectivity for SB431542. This work provides a framework for optimising the SB431542 scaffold to more potent and selective inhibitors of the TGFβ/Activin pathway.


    Organizational Affiliation

    Center for Systems Biology, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TGF-beta receptor type-1
A
309Homo sapiensMutation(s): 0 
Gene Names: TGFBR1 (ALK5, SKR4)
EC: 2.7.11.30
Find proteins for P36897 (Homo sapiens)
Go to Gene View: TGFBR1
Go to UniProtKB:  P36897
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
085
Query on 085

Download SDF File 
Download CCD File 
A
4-[5-(1,3-benzodioxol-5-yl)-4-(pyridin-2-yl)-1H-imidazol-2-yl]benzamide
SB431542
C22 H16 N4 O3
FHYUGAJXYORMHI-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.170 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.771α = 90.00
b = 77.726β = 90.00
c = 90.070γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
ADSCdata collection
MOLREPphasing
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release