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Little is known on antimicrobial peptide permeation through outer membrane channels in Gram-negative bacteria. Herein, we probed at a single-molecule level the interaction of two different peptides, magainin 2 and HPA3P with OmpF from E. coli. HPA3P is an analogue of the antimicrobial peptide HP(2–20) isolated from the N-terminal region of the Helicobacter pylori ribosomal protein. Our data show that...
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