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Bacterial infection has continued to be a leading cause of death or disability worldwide because of antibiotic resistance. Antibiotic agents specific to certain taxa of bacteria, i.e., narrow-spectrum antibiotics, have become useful because they can kill bacteria without resulting in broad-spectrum drug resistance. In this study, we describe a series of antibiotics based on combining gold nanoparticles (AuNPs) with aminosaccharides, even though these AuNPs or aminosaccharides by themselves are ineffective against any bacteria. The AuNP-based multivalent aminosaccharides can effectively and selectively inhibit the growth of Gram-positive bacteria (including drug-resistant superbacteria). In particular, aminosaccharide-modified AuNPs are effective against methicillin-resistant Staphylococcus aureus (MRSA), a particularly hard-to-treat strain. This report carves out a way to explore antibiotics by combining AuNPs and an aminosaccharide as multivalent nanostructures, neither of which by itself is effective as an antibiotic.
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