Discovery of Boronic Acids-Based β-Lactamase Inhibitors Through In Situ Click Chemistry

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Abstract
In this study we evaluated in situ click chemistry as platform for discovering boronic acid-based β-lactamase inhibitors (BLIs). Unlike conventional drug discovery approaches requiring multi-step synthesis, protection strategies, and extensive screening, the in situ method can allow the generation and identification of potent β-lactamase inhibitors in a rapid, economic and efficient way. Using KPC-2 (class A carbapenemase) and AmpC (class C cephalosporinase) as templates, we demonstrated their ability to catalyse azide-alkyne cycloaddition, facilitating the formation of triazole-based β-lactamase inhibitors. Initial screening of various β-lactamases and boronic warheads identified compound 3 (3-azidomethylphenyl boronic acid) as the most effective scaffold for Kinetic Target-Guided Synthesis (KTGS). KTGS experiments with AmpC and KPC-2 yielded triazole inhibitors with Ki values as low as 140 nM (compound 10a, AmpC) and 730 nM (compound 5, KPC-2). Competitive inhibition studies confirmed triazole formation within the active site, while LC-MS analysis verified that the reversible covalent interaction of boronic acids did not affect detection of the in situ synthesised product. While KTGS successfully identified potent inhibitors, limitations in amplification coefficients and spatial constraints highlight the need for optimised warhead designs. This study validates KTGS as a promising strategy for BLI discovery and provides insights for further refinement in fighting β-lactamase-mediated antibiotic resistance.

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