Download MendeleyThe Enzymatic Activity of Inosine 5'-Monophosphate Dehydrogenase May Not Be a Vulnerable Target for Staphylococcus aureus Infections.
Modi, G., Marqus, G.M., Vippila, M.R., Gollapalli, D.R., Kim, Y., Manna, A.C., Chacko, S., Maltseva, N., Wang, X., Cullinane, R.T., Zhang, Y., Kotler, J.L.M., Kuzmic, P., Zhang, M., Lawson, A.P., Joachimiak, A., Cheung, A., Snider, B.B., Rothstein, D.M., Cuny, G.D., Hedstrom, L.(2021) ACS Infect Dis 7: 3062-3076
- PubMed: 34590817
- DOI: https://doi.org/10.1021/acsinfecdis.1c00342
- Primary Citation of Related Structures:
5URS, 5UUV, 5UUZ, 7MTU, 7MTX - PubMed Abstract:
Many bacterial pathogens, including Staphylococcus aureus , require inosine 5'-monophosphate dehydrogenase (IMPDH) for infection, making this enzyme a promising new target for antibiotics. Although potent selective inhibitors of bacterial IMPDHs have been reported, relatively few have displayed antibacterial activity. Here we use structure-informed design to obtain inhibitors of S. aureus IMPDH ( Sa IMPDH) that have potent antibacterial activity (minimal inhibitory concentrations less than 2 μM) and low cytotoxicity in mammalian cells. The physicochemical properties of the most active compounds were within typical Lipinski/Veber space, suggesting that polarity is not a general requirement for achieving antibacterial activity. Five compounds failed to display activity in mouse models of septicemia and abscess infection. Inhibitor-resistant S. aureus strains readily emerged in vitro . Resistance resulted from substitutions in the cofactor/inhibitor binding site of Sa IMPDH, confirming on-target antibacterial activity. These mutations decreased the binding of all inhibitors tested, but also decreased catalytic activity. Nonetheless, the resistant strains had comparable virulence to wild-type bacteria. Surprisingly, strains expressing catalytically inactive Sa IMPDH displayed only a mild virulence defect. Collectively these observations question the vulnerability of the enzymatic activity of Sa IMPDH as a target for the treatment of S. aureus infections, suggesting other functions of this protein may be responsible for its role in infection.
- Department of Biology, Brandeis University, Waltham, Massachusetts 02453, United States.
Organizational Affiliation:
