4HCV image
Entry Detail
PDB ID:
4HCV
Title:
Crystal structure of ITK in complex with compound 53
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-10-01
Release Date:
2012-11-14
Method Details:
Experimental Method:
Resolution:
1.48 Å
R-Value Free:
0.18
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tyrosine-protein kinase ITK/TSK
Mutations:K596R
Chain IDs:A
Chain Length:269
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Covalent inhibitors of interleukin-2 inducible T cell kinase (itk) with nanomolar potency in a whole-blood assay.
J.Med.Chem. 55 10047 10063 (2012)
PMID: 23098091 DOI: 10.1021/jm301190s

Abstact

We wish to report a strategy that targets interleukin-2 inducible T cell kinase (Itk) with covalent inhibitors. Thus far, covalent inhibition of Itk has not been disclosed in the literature. Structure-based drug design was utilized to achieve low nanomolar potency of the disclosed series even at high ATP concentrations. Kinetic measurements confirmed an irreversible binding mode with off-rate half-lives exceeding 24 h and moderate on-rates. The analogues are highly potent in a cellular IP1 assay as well as in a human whole-blood (hWB) assay. Despite a half-life of approximately 2 h in resting primary T cells, the covalent inhibition of Itk resulted in functional silencing of the TCR pathway for more than 24 h. This prolonged effect indicates that covalent inhibition is a viable strategy to target the inactivation of Itk.

Legend

Protein

Chemical

Disease

Primary Citation of related structures