4KJU image
Entry Detail
PDB ID:
4KJU
Title:
Crystal structure of XIAP-Bir2 with a bound benzodiazepinone inhibitor.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-05-03
Release Date:
2013-11-27
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.18
Space Group:
I 4 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:E3 ubiquitin-protein ligase XIAP
Mutations:C202A, C213G
Chain IDs:A, B (auth: C)
Chain Length:86
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Optimization of Benzodiazepinones as Selective Inhibitors of the X-Linked Inhibitor of Apoptosis Protein (XIAP) Second Baculovirus IAP Repeat (BIR2) Domain.
J.Med.Chem. 56 7788 7803 (2013)
PMID: 24093940 DOI: 10.1021/jm400732v

Abstact

The IAPs are key regulators of the apoptotic pathways and are commonly overexpressed in many cancer cells. IAPs contain one to three BIR domains that are crucial for their inhibitory function. The pro-survival properties of XIAP come from binding of the BIR domains to the pro-apoptotic caspases. The BIR3 domain of XIAP binds and inhibits caspase 9, while the BIR2 domain binds and inhibits the terminal caspases 3 and 7. While XIAP BIR3 inhibitors have previously been reported, they also inhibit cIAP1/2 and promote the release of TNFα, potentially limiting their therapeutic utility. This paper will focus on the optimization of selective XIAP BIR2 inhibitors leading to the discovery of highly potent benzodiazepinone 36 (IC50 = 45 nM), which has high levels of selectivity over XIAP BIR3 and cIAP1 BIR2/3 and shows efficacy in a xenograft pharmacodynamic model monitoring caspase activity while not promoting the release of TNFα in vitro.

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