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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Weir, Ron / Stohner, Jürgen

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Volume 79, Issue 4 (Jan 2007)

Issues

Influence of C-terminal amidation on the antimicrobial and hemolytic activities of cationic α-helical peptides

Erik Strandberg
  • Corresponding author
  • Institute for Biological Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
/ Deniz Tiltak
  • Corresponding author
  • Institute of Organic Chemistry, University of Karlsruhe, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
/ Marco Ieronimo
  • Corresponding author
  • Institute of Organic Chemistry, University of Karlsruhe, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
/ Nathalie Kanithasen
  • Corresponding author
  • Institute of Organic Chemistry, University of Karlsruhe, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
/ Parvesh Wadhwani
  • Corresponding author
  • Institute for Biological Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
/ Anne S. Ulrich
  • Corresponding author
  • Institute for Biological Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Published Online: 2009-01-01 | DOI: https://doi.org/10.1351/pac200779040717

The effect of C-terminal amidation on the antimicrobial and hemolytic activities of antimicrobial peptides was studied using three cationic peptides which form amphiphilic α-helices when bound to membranes. The natural antimicrobial peptide PGLa, the designer-made antibiotic MSI-103, and the cell-penetrating "model amphipathic peptide" (MAP) are all amidated in their original forms, and their biological activities were compared with the same sequences carrying a free C-terminus. It was found that, in general, a free COOH-terminus reduces both the antimicrobial activity and the hemolytic side effects of the peptides. The only exception was observed for MSI-103, whose antimicrobial activity was not decreased in the acid form. Having shown that the therapeutic index (TI) of this novel peptide is significantly higher than for the other tested peptides, with high antibiotic activity and little undesired effects, we suggest that it could be a useful starting point for further development of new peptide antibiotics.

Keywords: amphipathic peptides; antimicrobial peptides; biological assays; cationic α-helices; C-terminal modifications; designed peptide antibiotics

Conference

International Symposium on Chemistry of Natural Products (ISCNP-25) and 5th International Conference on Biodiversity (ICOB-5), International Conference on Biodiversity, International Symposium on the Chemistry of Natural Products, ICOB, ISCNP, Biodiversity, Natural Products, 25th, Kyoto, Japan, 2006-07-23–2006-07-28

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About the article

Published Online: 2009-01-01

Published in Print: 2007-01-01


Citation Information: Pure and Applied Chemistry, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1351/pac200779040717.

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