Discovery, Synthesis and Evaluation of a Ketol-Acid Reductoisomerase Inhibitor.Bayaraa, T., Kurz, J.L., Patel, K.M., Hussein, W.M., Bilyj, J.K., West, N.P., Schenk, G., McGeary, R.P., Guddat, L.W.
(2020) Chemistry 26: 8958-8968
- PubMed: 32198779
- DOI: 10.1002/chem.202000899
- Primary Citation of Related Structures:
- PubMed Abstract:
Ketol-acid reductoisomerase (KARI), the second enzyme in the branched-chain amino acid biosynthesis pathway, is a potential drug target for bacterial infections including Mycobacterium tuberculosis . Here, we have screened the Medicines for Malaria V ...
Ketol-acid reductoisomerase (KARI), the second enzyme in the branched-chain amino acid biosynthesis pathway, is a potential drug target for bacterial infections including Mycobacterium tuberculosis . Here, we have screened the Medicines for Malaria Venture Pathogen Box against purified M. tuberculosis ( Mt ) KARI and identified two compounds that have K i values below 200 nM. In Mt cell susceptibility assays one of these compounds exhibited an IC 50 value of 0.8 μM. Co-crystallization of this compound, 3-((methylsulfonyl)methyl)-2 H -benzo[ b ][1,4]oxazin-2-one (MMV553002), in complex with Staphylococcus aureus KARI, which has 56% identity with Mt KARI, NADPH and Mg 2+ yielded a structure to 1.72 Å resolution. However, only a hydrolyzed product of the inhibitor ( i.e. 3-(methylsulfonyl)-2-oxopropanic acid, missing the 2-aminophenol attachment) is observed in the active site. Surprisingly, Mt cell susceptibility assays showed that the 2-aminophenol product is largely responsible for the anti-TB activity of the parent compound. Thus, we have identified 3-(methylsulfonyl)-2-oxopropanic acid is a potent KARI inhibitor that could be further explored as a potential biocidal agent and we have shown 2-aminophenol, as an anti-TB drug lead, especially given it has low toxicity against human cells. The study highlights that careful analysis of broad screening assays is required to correctly interpret cell-based activity data.
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