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Bacterial pathogens continue to impose a tremendous health burden across the globe. Here, we describe a novel series of polymyxin-based agents grafted with membrane-active quaternary ammonium warheads to combine two important classes of Gram-negative antimicrobial scaffolds. The goal was to deliver a targeted quaternary ammonium warhead onto the surface of bacterial pathogens using the outer membrane homing properties of polymyxin. The most potent agents resulted in new scaffolds that retained the ability to target Gram-negative bacteria