Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 45, Pages 12236-12239Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407145
Keywords
antibiotics; Gram-negative bacteria; inhibitors; peptides; ribosomes
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Funding
- Bundesministerium fur Bildung und Forschung (BMBF) [Forderkennzeichen 01GU1104A]
- European Fund for Regional Structure Development (EFRE) [10012675]
- European Fund for Regional Structure Development (European Union) [10012675]
- European Fund for Regional Structure Development (Free State of Saxony) [10012675]
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Proline-rich antimicrobial peptides (PrAMPs) have been investigated and optimized by several research groups and companies as promising lead compounds to treat systemic infections caused by Gram-negative bacteria. PrAMPs, such as apidaecins and oncocins, enter the bacteria and kill them apparently through inhibition of specific targets without a lytic effect on the membranes. Both apidaecins and oncocins were shown to bind with nanomolar dissociation constants to the 70S ribosome. In apidaecins, at least the two C-terminal residues (Arg17 and Leu18) interact strongly with the 70S ribosome, whereas residues Lys3, Tyr6, Leu7, and Arg11 are the major interaction sites in oncocins. Oncocins inhibited protein biosynthesis very efficiently in vitro with half maximal inhibitory concentrations (IC50 values) of 150 to 240 nmolL(-1). The chaperone DnaK is most likely not the main target of PrAMPs but it binds them with lower affinity.
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