3TZM image
Entry Detail
PDB ID:
3TZM
Title:
TGF-beta Receptor type 1 in complex with SB431542
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2011-09-27
Release Date:
2012-05-23
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.20
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:TGF-beta receptor type-1
Chain IDs:A
Chain Length:309
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural Basis for Specificity of TGFbeta Family Receptor Small Molecule Inhibitors
Cell Signal 24 476 483 (2012)
PMID: 21983015 DOI: 10.1016/j.cellsig.2011.09.027

Abstact

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.

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Primary Citation of related structures