Insight into the antifungal mechanism of action of human RNase N-terminus derived peptides

Vivian A. Salazar, Javier Arranz-Trullén, Guillem Prats-Ejarque, Marc Torrent, David Andreu, David Pulido, Ester Boix

Research output: Contribution to journalArticleResearch

4 Citations (Scopus)

Abstract

© 2019 by the authors. Candida albicans is a polymorphic fungus responsible formucosal and skin infections. Candida cells establish themselves into biofilm communities resistant to most currently available antifungal agents. An increase of severe infections ensuing in fungal septic shock in elderly or immunosuppressed patients, along with the emergence of drug-resistant strains, urge the need for the development of alternative antifungal agents. In the search for novel antifungal drugs our laboratory demonstrated that two human ribonucleases from the vertebrate-specific RNaseA superfamily, hRNase3 and hRNase7, display a high anticandidal activity. In a previous work, we proved that the N-terminal region of the RNaseswas sufficient to reproducemost of the parental protein bactericidal activity. Next, we explored their potency against a fungal pathogen. Here, we have tested the N-terminal derived peptides that correspond to the eight human canonical RNases (RN1-8) against planktonic cells and biofilms of C. albicans. RN3 and RN7 peptides displayed the most potent inhibitory effect with a mechanism of action characterized by cell-wall binding,membrane permeabilization and biofilmeradication activities. Both peptides are able to eradicate planktonic and sessile cells, and to alter their gene expression, reinforcing its role as a lead candidate to develop novel antifungal and antibiofilm therapies.
Original languageEnglish
Article number4558
JournalInternational Journal of Molecular Sciences
Volume20
DOIs
Publication statusPublished - 2 Sep 2019

Keywords

  • Antifungal activity
  • Antimicrobial peptides
  • Biofilms
  • Candida albicans
  • RNaseA superfamily

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