Small Peptides Derived from Penetratin as Antibacterial Agents

Parravicini, Oscar and Somlai, Csaba and Andujar, Sebastián A. and Garro, Adriana D. and Lima, Beatriz and Tapia, Alejandro and Feresin, Gabriela and Perczel, András and Tóth, Gábor and Cascales, Javier López and Rodrigues, Ana M. and Enriz, Ricardo D. (2016) Small Peptides Derived from Penetratin as Antibacterial Agents. Archiv der Pharmazie / Chemistry in Life Sciences, 349. pp. 242-251. ISSN 1521-4184

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Abstract

The synthesis, in vitro evaluation and conformational study of several small-size peptides acting as antibacterial agents are reported. Among the compounds evaluated, the peptides Arg-Gln-Ile-Lys-Ile-Trp-Arg-Arg-Met-Lys-Trp-Lys-Lys-NH 2, Arg-Gln-Ile-Lys-Ile-Arg-Arg-Met-Lys-Trp-Arg-NH2, and Arg-Gln-Ile-Trp-Trp-Trp-Trp-Gln-Arg-NH2 exhibited significant antibacterial activity. These were found to be very active antibacterial compounds, considering their small molecular size. In order to better understand the antibacterial activity obtained for these peptides, an exhaustive conformational analysis was performed, using both theoretical calculations and experimental measurements. Molecular dynamics simulations using two different media (water and trifluoroethanol/water) were employed. The results of these theoretical calculations were corroborated by experimental circular dichroism easurements. A brief discussion on the possible mechanism of action of these peptides at molecular level is also presented. Some of the peptides reported here constitute very interesting structures to be used as starting compounds for the design of new small-size peptides possessing antibacterial activity.

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