Por meio de técnicas cromatográficas, um novo peptídeo aniônico, denominado otacidina, foi isolado das secreções cutâneas de três anuros brasileiros Osteocephalus taurinus. O sequenciamento de novo dos aminoácidos foi realizado por meio de análises por espectrometria de massas por tempo de vôo acoplada à ionização dessortiva de matriz por laser (MALDI-TOF-MS/MS). O potencial antimicrobiano deste novo metabólito foi avaliado contra cepas de Escherichia coli e Pseudomonas aeruginosa, sendo observadas concentrações inibitórias mínimas (MICs) de 37,4 e 78,4 mM, respectivamente. Este trabalho é apenas o segundo relato de um peptídeo aniônico com propriedades antimicrobianas, isolado da pele de um anfíbio.By means of chromatographic techniques, a novel anionic peptide, named otacidin, was isolated from the skin secretions of tree Brazilian anurans Osteocephalus taurinus. The de novo sequencing of the amino acids was performed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS/MS) analyses. The antimicrobial potential of this novel metabolite was evaluated against Escherichia coli and Pseudomonas aeruginosa, being observed minimum inhibitory concentration (MICs) of 37.4 and 78.4 mM, respectively. This work is just the second report of an antimicrobial anionic peptide from an amphibian.
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