Abstract
Replacement of the leader sequence of enterocin A (EntA), a bacteriocin produced by Enterococcus faecium PLBC21, by the signal peptide of enterocin P (EntP), a sec-dependent bacteriocin produced by E. faecium P13, permitted production of EntA in Lactococcus lactis. Chimeras encoding the EntP signal peptide (SPentP) fused to mature EntA (entA), with or without its immunity gene (entiA), were cloned into the expression vector pMG36c to generate the recombinant plasmids, pMPA15 (SPentP:entA) and pMPA10i (SPentP:entA + entiA). Transformation of competent L. lactis subsp. lactis IL1403 and L. lactis subsp. cremoris NZ9000 with the recombinant plasmids permitted production of EntA by the transformed cells, and the co-production of nisin A and EntA by the L. lactis subsp. lactis DPC5598 transformants. Mature EntA fused to SPEntP is the minimum requirement for synthesis, processing and secretion of biologically active EntA in L. lactis. The production of EntA by most recombinant L. lactis hosts was larger than in the E. faecium control strains. All L. lactis derivatives showed antimicrobial activity against Listeria spp., and L. lactis (pMPA15) displayed the highest antilisterial effect.


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Acknowledgements
The authors wish to express their gratitude to Prof. R.P. Ross (Teagasc Dairy Products Research Centre, Moorepark, Fermoy, Cork, Ireland) for providing the strain L. lactis DPC5598 and to Prof. Jan Kok (Department of Genetics, University of Groningen, The Netherlands) for the supply of pMG36c. This work was partially supported by grants AGL2003-01508 and AGL2006-01042 from the Ministerio de Educación y Ciencia (MEC) and by grant S-0505/AGR/0265 from the Comunidad de Madrid (CAM), Spain. MM and RC hold a fellowship from the Ministerio de Educación, Cultura y Deporte (MECD), whereas JG is recipient of a fellowship from the Ministerio de Ciencia y Tecnología (MCYT), Spain.
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Martín, M., Gutiérrez, J., Criado, R. et al. Cloning, production and expression of the bacteriocin enterocin A produced by Enterococcus faecium PLBC21 in Lactococcus lactis . Appl Microbiol Biotechnol 76, 667–675 (2007). https://doi.org/10.1007/s00253-007-1044-3
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DOI: https://doi.org/10.1007/s00253-007-1044-3

