Peptídeos antimicrobianos de Hypsiboas cinerascens (Spix, 1824).

Abstract

Amphibian skin secretions are rich sources of biologically active substances with various physiological functions and defense, most of low molecular weight, as biogenic amines, alkaloids, steroids, peptides and proteins of high molecular weight. The genus Hypsiboas, belonging to the family Hylidae from class of amphibians, presents as promissing supplier of peptides with biological potential. Peptides identified of species Hypsiboas are analogous to the known antimicrobial peptides. This work was realized a systematic study of the skin secretion of Hypsiboas cinerascens obtained by stimulation, where it was possible to identify a new peptide with wide antimicrobial activity, named cinerascetina. Its sequence was identified by techniques of high performance liquid chromatography (HPLC) and mass spectrometry (MALDI-TOFTOF) and confirmed by genetic sequencing, and was also possible identified six new peptides with possible antimicrobial activity.