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Thiophenecarboxamide Derivatives Activated by EthA Kill Mycobacterium tuberculosis by Inhibiting the CTP Synthetase PyrG.


ABSTRACT: To combat the emergence of drug-resistant strains of Mycobacterium tuberculosis, new antitubercular agents and novel drug targets are needed. Phenotypic screening of a library of 594 hit compounds uncovered two leads that were active against M. tuberculosis in its replicating, non-replicating, and intracellular states: compounds 7947882 (5-methyl-N-(4-nitrophenyl)thiophene-2-carboxamide) and 7904688 (3-phenyl-N-[(4-piperidin-1-ylphenyl)carbamothioyl]propanamide). Mutants resistant to both compounds harbored mutations in ethA (rv3854c), the gene encoding the monooxygenase EthA, and/or in pyrG (rv1699) coding for the CTP synthetase, PyrG. Biochemical investigations demonstrated that EthA is responsible for the activation of the compounds, and by mass spectrometry we identified the active metabolite of 7947882, which directly inhibits PyrG activity. Metabolomic studies revealed that pharmacological inhibition of PyrG strongly perturbs DNA and RNA biosynthesis, and other metabolic processes requiring nucleotides. Finally, the crystal structure of PyrG was solved, paving the way for rational drug design with this newly validated drug target.

SUBMITTER: Mori G 

PROVIDER: S-EPMC4521081 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature

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Thiophenecarboxamide Derivatives Activated by EthA Kill Mycobacterium tuberculosis by Inhibiting the CTP Synthetase PyrG.

Mori Giorgia G   Chiarelli Laurent R LR   Esposito Marta M   Makarov Vadim V   Bellinzoni Marco M   Hartkoorn Ruben C RC   Degiacomi Giulia G   Boldrin Francesca F   Ekins Sean S   de Jesus Lopes Ribeiro Ana Luisa AL   Marino Leonardo B LB   Centárová Ivana I   Svetlíková Zuzana Z   Blaško Jaroslav J   Kazakova Elena E   Lepioshkin Alexander A   Barilone Nathalie N   Zanoni Giuseppe G   Porta Alessio A   Fondi Marco M   Fani Renato R   Baulard Alain R AR   Mikušová Katarína K   Alzari Pedro M PM   Manganelli Riccardo R   de Carvalho Luiz Pedro S LP   Riccardi Giovanna G   Cole Stewart T ST   Pasca Maria Rosalia MR  

Chemistry & biology 20150618 7


To combat the emergence of drug-resistant strains of Mycobacterium tuberculosis, new antitubercular agents and novel drug targets are needed. Phenotypic screening of a library of 594 hit compounds uncovered two leads that were active against M. tuberculosis in its replicating, non-replicating, and intracellular states: compounds 7947882 (5-methyl-N-(4-nitrophenyl)thiophene-2-carboxamide) and 7904688 (3-phenyl-N-[(4-piperidin-1-ylphenyl)carbamothioyl]propanamide). Mutants resistant to both compou  ...[more]

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