Whether bacteria are resistant to antibiotics is often decided at the cell membrane. This is where antibiotics can be blocked on their way into the cell interior or catapulted from the inside to the outside. Macrocyclic peptides, a novel class of antibiotics, bioactive cytotoxins and inhibitors, shed light on how this transport process occurs at the membrane, how it is influenced and how it can be used to circumvent the resistance of a malignantly transformed cell.
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