Abstract

CASTANEDA, Arnaldo E. et al. Identification of antimicrobial peptides from Enterococcus faecium IP5-2a isolated from tilapia gut using mass spectrometry. Rev. investig. vet. Perú [online]. 2024, vol.35, n.1, e25580.  Epub Feb 29, 2024. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v35i1.25580.

Antimicrobial peptides are small molecules that exhibit strong antagonistic activity against pathogenic microorganisms and are synthesized by a wide variety or organisms, including probiotic bacteria. The aim of the study was to identify peptides with antimicrobial activity in the Enterococcus faecium IP5-2a strain previously isolated from the intestinal tract of Nile tilapia (Oreochromis niloticus). Cellular and extracelullar proteins extraction was performed, followed by 1D SDS-PAGE gel electrophoresis and MALDI-TOF/TOF mass spectrometry. The results revealed peptides with antimicrobial activity, including P54 (SagA) protein, a bacteriocin-like protein and a lantibiotic. These proteins play an important role in the antagonistic capacity of the E. faecium IP52a strain, allowing it to be considered as a potential probiotic in the aquaculture industry.

Keywords : bioactive peptides; probiotics; lactic acid bacteria; MALDI-TOF/TOF.

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