Bioorg Med Chem. 2021 Apr 8;38:116128. doi: 10.1016/j.bmc.2021.116128. Online ahead of print.
To combat the superbug infection caused by metallo-β-lactamases (MβLs), a dipyridyl-substituted thiosemicarbazone (DpC), was identified to be the broad-spectrum inhibitor of MβLs (NDM-1, VIM-2, IMP-1, ImiS, L1), with an IC50 value in the range of 0.021-1.08 µM. It reversibly and competitively inhibited NDM-1 with a Ki value of 10.2 nM. DpC showed broad-spectrum antibacterial effect on clinical isolate K. pneumonia, CRE, VRE, CRPA and MRSA, with MIC value ranged from 16 to 32 µg/mL, and exhibited synergistic antibacterial effect with meropenem on MβLs-producing bacteria, resulting in a 2-16-, 2-8-, and 8-fold reduction in MIC of meropenem against EC-MβLs, EC01-EC24, K. pneumonia, respectively. Moreover, mice experiments showed that DpC also had synergistic antibacterial action with meropenem. In this work, DpC was identified to be a potent scaffold for the development of broad-spectrum inhibitors of MβLs.