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Abstract A key challenge in addressing the antibiotic resistance crisis is identifying new antimicrobial compounds1. Although natural products produced by fungi and bacteria, particularly actinomycetes, have been the source of most antibiotics discovered over the past 80 years, they have fallen out of favour owing to the frequent rediscovery of known drug scaffolds2. The current perception is that antibiotic-producing actinomycetes have been over-mined and possess little novelty left to yield.
Abstract Proline-rich antimicrobial peptides (PrAMPs) kill bacteria by binding in the ribosomal nascent peptide exit tunnel. Type II PrAMPs bind in an orientation matching that of the nascent protein, trap the release factors and arrest ribosomes at stop codons. Conversely, Type I PrAMPs bind in an opposite orientation: their N-terminus invades the peptidyl transferase center arresting translation at start codons.
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