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Metallo-β-lactamases (MBLs) are enzymes produced by bacteria that confer resistance to most β-lactam antibiotics, including carbapenems, which have the broadest spectrum of activity. This resistance mechanism poses a significant threat to public health as it drastically reduces treatment options for severe bacterial infections. Developing effective inhibitors against MBLs is crucial to restore susceptibility to β-lactam antibiotics. This review aims to provide an updated analysis of patents describing novel MBL inhibitors and their potential therapeutic applications that were filed between January 2020 and May 2023. Significant advancements were made in the development of selective MBL inhibitors with zinc-binding and zinc-chelating mechanisms of action. Dual inhibitors, targeting simultaneously both serine-β-lactamases (SBLs) and MBLs, represent an interesting alternative approach that is increasingly pertinent for the treatment of infections involving multiple β-lactamases from different Ambler classes. Most examples of MBL-specific inhibitors were focused on the treatment of MBL-mediated infections in  Enterobacterales , where IMP-1 was a more difficult target compared with VIM-1 or NDM-1, and much less on  Pseudomonas aeruginosa  or  Acinetobacter baumannii , which are more challenging to address.

An updated patent review of metallo-β-lactamase inhibitors (2020–2023)