Biomolecules (May 2020)

Biological Properties of a Novel Multifunctional Host Defense Peptide from the Skin Secretion of the Chaco Tree Frog, <i>Boana raniceps</i>

  • Carlos José Correia Santana,
  • Ana Carolina Martins Magalhães,
  • César Augusto Prías-Márquez,
  • Diego A. Falico,
  • Agenor C. M. dos Santos Júnior,
  • Beatriz D. Lima,
  • Carlos André Ornelas Ricart,
  • Denise Regina Bairros de Pilger,
  • Rafaela Milan Bonotto,
  • Carolina Borsoi Moraes,
  • Lúcio H. Freitas-Júnior,
  • Alice da Cunha Morales Álvares,
  • Sonia Maria Freitas,
  • Isabelle S. Luz,
  • Osmindo Rodrigues Pires Jr.,
  • Wagner Fontes,
  • Mariana S. Castro

DOI
https://doi.org/10.3390/biom10050790
Journal volume & issue
Vol. 10, no. 5
p. 790

Abstract

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In recent years, the number of new antimicrobial drugs launched on the market has decreased considerably even though there has been an increase in the number of resistant microbial strains. Thus, antimicrobial resistance has become a serious public health problem. Amphibian skin secretions are a rich source of host defense peptides, which generally are cationic and hydrophobic molecules, with a broad-spectrum of activity. In this study, one novel multifunctional defense peptide was isolated from the skin secretion of the Chaco tree frog, Boana raniceps. Figainin 2 (1FLGAILKIGHALAKTVLPMVTNAFKPKQ28) is cationic and hydrophobic, adopts an α-helical structure in 50% (v/v) trifluoroethanol (TFE), and is thermally stable. This peptide exhibited activity against Gram-negative and Gram-positive pathogenic bacteria arboviruses, T. cruzi epimastigotes; however, it did not show activity against yeasts. Figainin 2 also showed antiproliferative activity on cancer cells, is moderately active on human erythrocytes, and activates the oxidative burst in human neutrophils.

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