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HOME > J. Microbiol > Volume 48(1); 2010 > Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Enterococcus faecium Isolated from Honey Synthesized Bacteriocin-Like Substances Active against Different Listeria monocytogenes Strains
Carolina Ibarguren 1, Raúl R. Raya 2, María C. Apella 2, M. Carina Audisio 1
Journal of Microbiology 2010;48(1):44-52.
DOI: https://doi.org/10.1007/s12275-009-0177-8
Published online: March 11, 2010
1Instituto de Investigaciones para la Industria Química - Consejo Nacional de Investigaciones Científicas y Técnicas (INIQUI-CONICET), Universidad Nacional de Salta, Salta A4402FDC, Argentina, 2Centro de Referencia para Lactobacilos - Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), Tucumán T4000ILC, Argentina
Corresponding author:  M. Carina Audisio , Tel: +54-387-425-1006, 
Received: 5 June 2009   • Accepted: 12 August 2009
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Abstract

Four Enterococcus faecium strains, isolated from honeycombs (C1 and M2d strains) and feral combs (Mori1 and M1b strains) secreted antimicrobial substances active against fourteen different Listeria spp. strains. The antimicrobial compound(s) present in the cell free supernatant were highly thermostable (121°C for 15 min) and inactivated by proteolytic enzymes, but not by α-amylase and lipase, thus suggesting a peptidic nature. Since the structural bacteriocin gene determinants of enterocins A and B were PCR amplified from the four E. faecium isolates, only the bacteriocin produced by strain C1 was further characterized: it showed a broad band of approximately 4.0-7.0 kDa in SDS-PAGE and was bactericidal (4 log decrease) against L. monocytogenes 99/287. L. monocytogenes 99/287R, a clone spontaneously resistant to the enterocin produced by E. avium DSMZ17511 (ex PA1), was not inhibited by the enterocin-like compounds produced by strain C1. However, it was inhibited in mixed culture fermentations by E. faecium C1 and a bacteriostatic effect was observed. The bacteriocin-producer Enterococcus strains were not haemolytic; gelatinase negative and sensitive to vancomycin and other clinically relevant antibiotics.

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    Enterococcus faecium Isolated from Honey Synthesized Bacteriocin-Like Substances Active against Different Listeria monocytogenes Strains
    J. Microbiol. 2010;48(1):44-52.   Published online March 11, 2010
    DOI: https://doi.org/10.1007/s12275-009-0177-8
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