Abstract
The Lactococcus lactis subsp. lactis 194-K strain has been established to be able to produce two bacteriocins, one of which was identified as the known lantibiotic nisin A, and the other 194-D bacteriocin represents a polypeptide with a 2589-Da molecular mass and comprises 20 amino acid residues. Both bacteriocins were produced in varying proportions in all of the studied culture media, which support the growth of the producer. Depending on the cultivation medium, the nisin A content was 380- to 1123-fold lower in the 194-K stain culture broth than that of the 194-D peptide. In comparision to nisin A Bacteriocin 194-D possessed a wide range of antibacterial activity and suppressed the growth of both Gram-positive and Gram-negative bacteria. An optimal medium for 194-D bacteriocin synthesis was shown to be a fermentation medium which contained yeast extract, casein hydrolysate, and potassium phosphate. The biosynthesis of bacteriocin 194-D by the 194-K strain in these media occurred parallel to producer growth, and its maximal accumulation in the culture broth was observed at14–20 h of the strain’s growth.
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Original Russian Text © E.A. Ustyugova, A.V. Timofeeva, L.G. Stoyanova, A.I. Netrusov, G.S. Katrukha, 2012, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2012, Vol. 48, No. 6, pp. 618–625.
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Ustyugova, E.A., Timofeeva, A.V., Stoyanova, L.G. et al. Characteristics and identification of bacteriocins produced by Lactococcus lactis subsp. lactis 194-K. Appl Biochem Microbiol 48, 557–563 (2012). https://doi.org/10.1134/S0003683812060105
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DOI: https://doi.org/10.1134/S0003683812060105