Target-based identification of whole-cell active inhibitors of biotin biosynthesis in Mycobacterium tuberculosis.

TitleTarget-based identification of whole-cell active inhibitors of biotin biosynthesis in Mycobacterium tuberculosis.
Publication TypeJournal Article
Year of Publication2015
AuthorsPark SWoong, Casalena DE, Wilson DJ, Dai R, Nag PP, Liu F, Boyce JP, Bittker JA, Schreiber SL, Finzel BC, Schnappinger D, Aldrich CC
JournalChem Biol
Date Published2015 Jan 22
KeywordsAntitubercular Agents, Bacterial Proteins, Binding Sites, Biotin, Calorimetry, Crystallography, X-Ray, Drug Design, High-Throughput Screening Assays, Hydrogen Bonding, Microbial Sensitivity Tests, Molecular Dynamics Simulation, Mycobacterium tuberculosis, Protein Structure, Tertiary, Structure-Activity Relationship, Transaminases

Biotin biosynthesis is essential for survival and persistence of Mycobacterium tuberculosis (Mtb) in vivo. The aminotransferase BioA, which catalyzes the antepenultimate step in the biotin pathway, has been established as a promising target due to its vulnerability to chemical inhibition. We performed high-throughput screening (HTS) employing a fluorescence displacement assay and identified a diverse set of potent inhibitors including many diversity-oriented synthesis (DOS) scaffolds. To efficiently select only hits targeting biotin biosynthesis, we then deployed a whole-cell counterscreen in biotin-free and biotin-containing medium against wild-type Mtb and in parallel with isogenic bioA Mtb strains that possess differential levels of BioA expression. This counterscreen proved crucial to filter out compounds whose whole-cell activity was off target as well as identify hits with weak, but measurable whole-cell activity in BioA-depleted strains. Several of the most promising hits were cocrystallized with BioA to provide a framework for future structure-based drug design efforts.

Alternate JournalChem Biol
PubMed ID25556942
PubMed Central IDPMC4305006
Grant ListR03 MH096537 / MH / NIMH NIH HHS / United States
R01AI091790 / AI / NIAID NIH HHS / United States
U54 HG005032 / HG / NHGRI NIH HHS / United States
1 U54 HG005032-1 / HG / NHGRI NIH HHS / United States
R01 AI091790 / AI / NIAID NIH HHS / United States

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