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Polymyxins act by binding to lipid A moiety of the bacterial lipopolysaccharide and subsequently disintegrating the bacterial membranes. The most important mechanism of resistance includes modifications of the bacterial outer membrane structure, including lipopolysaccharide. Lipopolysaccharide modification is mostly mediated by PmrA/PmrB and PhoP/PhoQ two-component regulatory systems. These mechanisms...
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