Download MendeleyStructural and Functional Studies of Bacterial Enolase, a Potential Target against Gram-Negative Pathogens.
Krucinska, J., Falcone, E., Erlandsen, H., Hazeen, A., Lombardo, M.N., Estrada, A., Robinson, V.L., Anderson, A.C., Wright, D.L.(2019) Biochemistry 58: 1188-1197
- PubMed: 30714720
- DOI: https://doi.org/10.1021/acs.biochem.8b01298
- Primary Citation of Related Structures:
6BFY, 6BFZ - PubMed Abstract:
Enolase is a glycolytic metalloenzyme involved in carbon metabolism. The advantage of targeting enolase lies in its essentiality in many biological processes such as cell wall formation and RNA turnover and as a plasminogen receptor. We initially used a DARTS assay to identify enolase as a target in Escherichia coli. The antibacterial activities of α-, β-, and γ-substituted seven-member ring tropolones were first evaluated against four strains representing a range of Gram-negative bacteria. We observed that the chemical properties and position of the substituents on the tropolone ring play an important role in the biological activity of the investigated compounds. Both α- and β-substituted phenyl derivatives of tropolone were the most active with minimum inhibitory concentrations in the range of 11-14 μg/mL. The potential inhibitory activity of the synthetic tropolones was further evaluated using an enolase inhibition assay, X-ray crystallography, and molecular docking simulations. The catalytic activity of enolase was effectively inhibited by both the naturally occurring β-thujaplicin and the α- and β-substituted phenyl derivatives of tropolones with IC 50 values in range of 8-11 μM. Ligand binding parameters were assessed by isothermal titration calorimetry and differential scanning calorimetry techniques and agreed with the in vitro data. Our studies validate the antibacterial potential of tropolones with careful consideration of the position and character of chelating moieties for stronger interaction with metal ions and residues in the enolase active site.
Organizational Affiliation:
Department of Pharmaceutical Sciences , University of Connecticut , 69 North Eagleville Road , Storrs , Connecticut 06269 , United States.
