4DW6 image
Entry Detail
PDB ID:
4DW6
Title:
Novel N-phenyl-phenoxyacetamide derivatives as potential EthR inhibitors and ethionamide boosters. Discovery and optimization using High-Throughput Synthesis.
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2012-02-24
Release Date:
2013-03-27
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HTH-type transcriptional regulator EthR
Chain IDs:A
Chain Length:236
Number of Molecules:1
Biological Source:Mycobacterium tuberculosis
Primary Citation
Discovery of novel N-phenylphenoxyacetamide derivatives as EthR inhibitors and ethionamide boosters by combining high-throughput screening and synthesis.
J.Med.Chem. 55 6391 6402 (2012)
PMID: 22738293 DOI: 10.1021/jm300377g

Abstact

In this paper, we describe the screening of a 14640-compound library using a novel whole mycobacteria phenotypic assay to discover inhibitors of EthR, a transcriptional repressor implicated in the innate resistance of Mycobacterium tuberculosis to the second-line antituberculosis drug ethionamide. From this screening a new chemical family of EthR inhibitors bearing an N-phenylphenoxyacetamide motif was identified. The X-ray structure of the most potent compound crystallized with EthR inspired the synthesis of a 960-member focused library. These compounds were tested in vitro using a rapid thermal shift assay on EthR to accelerate the optimization. The best compounds were synthesized on a larger scale and confirmed as potent ethionamide boosters on M. tuberculosis -infected macrophages. Finally, the cocrystallization of the best optimized analogue with EthR revealed an unexpected reorientation of the ligand in the binding pocket.

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