MmpL3 is the cellular target of the antitubercular pyrrole derivative BM212.

Valentina La Rosa (1) , Giovanna Poce (2, 3) , Julio Ortiz Canseco (1) , Silvia Buroni (1) , Maria Rosalia Pasca (1) , Mariangela Biava (3) , Ravikiran M Raju (2) , Giulio Cesare Porretta (3) , Salvatore Alfonso (3) , Claudio Battilocchio (3) , Babak Javid (3) , Flavia Sorrentino (2) , Thomas R Ioerger (4) , James C Sacchettini (5) , Fabrizio Manetti (6) , Maurizio Botta (7) , Alessandro de Logu (8) , Eric J Rubin (2) , Edda de Rossi (1)

1 Dipartimento di Genetica e Microbiologia
2 Department of Immunology and Infectious Diseases
3 Department of Medicinal Chemistry and Technologies
4 Department of Biochemistry and Biophysics
5 Department of Biochemistry and Biophysics
6 UNISI - Università degli Studi di Siena = University of Siena
7 Dipartimento Farmaco Chimico Tecnologico
8 Dipartimento di Scienze e Tecnologie Biomediche

The 1,5-diarylpyrrole derivative BM212 was previously shown to be active against multidrug-resistant clinical isolates and Mycobacterium tuberculosis residing within macrophages as well as against Mycobacterium avium and other atypical mycobacteria. To determine its mechanism of action, we identified the cellular target. Spontaneous Mycobacterium smegmatis, Mycobacterium bovis BCG, and M. tuberculosis H37Rv mutants that were resistant to BM212 were isolated. By the screening of genomic libraries and by whole-genome sequencing, we found that all the characterized mutants showed mutations in the mmpL3 gene, allowing us to conclude that resistance to BM212 maps to the MmpL3 protein, a member of the MmpL (mycobacterial membrane protein, large) family. Susceptibility was unaffected by the efflux pump inhibitors reserpine, carbonylcyanide m-chlorophenylhydrazone, and verapamil. Uptake/efflux experiments with [(14)C]BM212 demonstrated that resistance is not driven by the efflux of BM212. Together, these data strongly suggest that the MmpL3 protein is the cellular target of BM212.

Domains: Pharmaceutical sciences

Valentina La Rosa, Giovanna Poce, Julio Ortiz Canseco, Silvia Buroni, Maria Rosalia Pasca, et al.. MmpL3 is the cellular target of the antitubercular pyrrole derivative BM212.. Antimicrobial Agents and Chemotherapy, 2012, 56 (1), pp.324-31. ⟨10.1128/AAC.05270-11⟩. ⟨pasteur-00968568⟩