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Arbulu S, Jiménez JJ, Gútiez L, et al. Evaluation of bacteriocinogenic activity, safety traits and biotechnological potential of fecal lactic acid bacteria (LAB), isolated from Griffon Vultures (Gyps fulvus subsp. fulvus). BMC Microbiol. 2016;16(1):228doi: 10.1186/s12866-016-0840-2.
Arbulu, S., Jiménez, J. J., Gútiez, L., Campanero, C., Del Campo, R., Cintas, L. M., Herranz, C., & Hernández, P. E. (2016). Evaluation of bacteriocinogenic activity, safety traits and biotechnological potential of fecal lactic acid bacteria (LAB), isolated from Griffon Vultures (Gyps fulvus subsp. fulvus). BMC microbiology, 16(1), 228. https://doi.org/10.1186/s12866-016-0840-2
Arbulu, Sara, et al. "Evaluation of bacteriocinogenic activity, safety traits and biotechnological potential of fecal lactic acid bacteria (LAB), isolated from Griffon Vultures (Gyps fulvus subsp. fulvus)." BMC microbiology vol. 16,1 (2016): 228. doi: https://doi.org/10.1186/s12866-016-0840-2
Arbulu S, Jiménez JJ, Gútiez L, Campanero C, Del Campo R, Cintas LM, Herranz C, Hernández PE. Evaluation of bacteriocinogenic activity, safety traits and biotechnological potential of fecal lactic acid bacteria (LAB), isolated from Griffon Vultures (Gyps fulvus subsp. fulvus). BMC Microbiol. 2016 Sep 29;16(1):228. doi: 10.1186/s12866-016-0840-2. PMID: 27688001; PMCID: PMC5041338.
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BMC Microbiol. 2016 Sep 29;16(1):228. doi: 10.1186/s12866-016-0840-2.

Evaluation of bacteriocinogenic activity, safety traits and biotechnological potential of fecal lactic acid bacteria (LAB), isolated from Griffon Vultures (Gyps fulvus subsp. fulvus).

BMC microbiology

Sara Arbulu, Juan J Jiménez, Loreto Gútiez, Cristina Campanero, Rosa Del Campo, Luis M Cintas, Carmen Herranz, Pablo E Hernández

Affiliations

  1. Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense de Madrid (UCM), Avenida Puerta de Hierro, s/n, 28040, Madrid, Spain.
  2. Servicio de Microbiología, Hospital Universitario Ramón y Cajal, and Instituto Ramón y Cajal de Investigaciones Sanitarias (IRYCIS), 28034, Madrid, Spain.
  3. Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense de Madrid (UCM), Avenida Puerta de Hierro, s/n, 28040, Madrid, Spain. [email protected].

PMID: 27688001 PMCID: PMC5041338 DOI: 10.1186/s12866-016-0840-2

Abstract

BACKGROUND: Lactic acid bacteria (LAB) are part of the gut microbiota and produce ribosomally synthesized antimicrobial peptides or bacteriocins with interest as natural food preservatives and therapeutic agents. Bacteriocin-producing LAB are also attractive as probiotics. Griffon vultures (Gyps fulvus subspecies fulvus) are scavenger birds that feed almost exclusively on carrion without suffering apparent ill effects. Therefore, griffon vultures might be considered a reservoir of bacteriocin-producing lactic acid bacteria (LAB) with potential biotechnological applications.

RESULTS: Griffon vulture feces were screened for LAB with antimicrobial activity, genes encoding bacteriocins, potential virulence determinants, susceptibility to antibiotics, genotyping and characterization of bacteriocins. In this study, from 924 LAB evaluated 332 isolates (36 %) showed direct antimicrobial activity against Gram-positive bacteria only. The molecular identification of the most antagonistic 95 isolates showed that enterococci was the largest LAB group with antimicrobial activity (91 %) and E. faecium (40 %) the most identified antagonistic species. The evaluation of the presence of bacteriocin structural genes in 28 LAB isolates with the highest bacteriocinogenic activity in their supernatants determined that most enterococcal isolates (75 %) encoded multiple bacteriocins, being enterocin A (EntA) the largest identified (46 %) bacteriocin. Most enterococci (88 %) were resistant to multiple antibiotics. ERIC-PCR and MLST techniques permitted genotyping and recognition of the potential safety of the bacteriocinogenic enterococci. A multiple-step chromatographic procedure, determination of the N-terminal amino acid sequence of purified bacteriocins by Edman degradation and a MALDI TOF/TOF tandem MS procedure permitted characterization of bacteriocins present in supernatants of producer cells.

CONCLUSIONS: Enterococci was the largest LAB group with bacteriocinogenic activity isolated from griffon vulture feces. Among the isolates, E. faecium M3K31 has been identified as producer of enterocin HF (EntHF), a bacteriocin with remarkable antimicrobial activity against most evaluated Listeria spp. and of elevated interest as a natural food preservative. E. faecium M3K31 would be also considered a safe probiotic strain for use in animal nutrition.

Keywords: Antimicrobial activity; Bacteriocins; Enterococci; Lactic acid bacteria (LAB); Probiotics; Virulence traits

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