3G1L

EthR from Mycobacterium tuberculosis in complex with compound BDM14744

Summary for 3G1L

• Entry DOI: 10.2210/pdb3g1l/pdb
• Related: 1u9n 1u9o 3G1M 3G1O
• Descriptor: TRANSCRIPTIONAL REGULATORY REPRESSOR PROTEIN (TETR-FAMILY) ETHR, 3-(4-fluorophenyl)-5-phenyl-4H-1,2,4-triazole (3 entities in total)
• Functional Keywords: tetr family, dna-binding, transcription, transcription regulation
• Biological source: Mycobacterium tuberculosis
• Total number of polymer chains: 1
• Total formula weight: 28363.69

Authors

Willand, N.,Dirie, B.,Carette, X.,Bifani, P.,Singhal, A.,Desroses, M.,Leroux, F.,Willery, E.,Mathys, V.,Deprez-Poulain, R.,Delcroix, G.,Frenois, F.,Aumercier, M.,Locht, C.,Villeret, V.,Deprez, B.,Baulard, A.R. (deposition date: 2009-01-30, release date: 2009-07-21, Last modification date: 2024-02-21)

Primary citation

Willand, N.,Dirie, B.,Carette, X.,Bifani, P.,Singhal, A.,Desroses, M.,Leroux, F.,Willery, E.,Mathys, V.,Deprez-Poulain, R.,Delcroix, G.,Frenois, F.,Aumercier, M.,Locht, C.,Villeret, V.,Deprez, B.,Baulard, A.R.
Synthetic EthR inhibitors boost antituberculous activity of ethionamide.
Nat.Med. (N.Y.), 15:537-544, 2009

PubMed Abstract: The side effects associated with tuberculosis therapy bring with them the risk of noncompliance and subsequent drug resistance. Increasing the therapeutic index of antituberculosis drugs should thus improve treatment effectiveness. Several antituberculosis compounds require in situ metabolic activation to become inhibitory. Various thiocarbamide-containing drugs, including ethionamide, are activated by the mycobacterial monooxygenase EthA, the production of which is controlled by the transcriptional repressor EthR. Here we identify drug-like inhibitors of EthR that boost the bioactivation of ethionamide. Compounds designed and screened for their capacity to inhibit EthR-DNA interaction were co-crystallized with EthR. We exploited the three-dimensional structures of the complexes for the synthesis of improved analogs that boosted the ethionamide potency in culture more than tenfold. In Mycobacterium tuberculosis-infected mice, one of these analogs, BDM31343, enabled a substantially reduced dose of ethionamide to lessen the mycobacterial load as efficiently as the conventional higher-dose treatment. This provides proof of concept that inhibiting EthR improves the therapeutic index of thiocarbamide derivatives, which should prompt reconsideration of their use as first-line drugs.

PubMed: 19412174
DOI: 10.1038/nm.1950

Experimental method

X-RAY DIFFRACTION (1.7 Å)