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Appl. Environ. Microbiol., 08 1996, 2897-2903, Vol 62, No. 8
RW Jack, J Wan, J Gordon, K Harmark, BE Davidson, AJ Hillier, RE Wettenhall, MW Hickey and MJ Coventry
A novel peptide bacteriocin produced by the lactic acid bacterium
Carnobacterium piscicola JG126 isolated from spoiled ham was purified and
characterized. This bacteriocin, designated piscicolin 126, inhibited the
growth of several gram-positive bacteria, especially the food-borne
pathogen Listeria monocytogenes, but had no effect on the growth of a
number of yeasts and gram-negative bacteria. Bactericidal activity was not
destroyed by exposure to elevated temperatures at low pH values; however,
bactericidal activity was lost at high pH values, especially when high pH
values were combined with an elevated temperature. Piscicolin 126 activity
was not affected by catalase, lipase, or lysozyme but was destroyed by
exposure to a range of proteolytic enzymes. Piscicolin 126 was purified to
homogeneity and was found to be a peptide having a molecular weight of
4,416.6 +/- 1.9. A sequence analysis revealed that this compound is a
cystibiotic (class IIa) bacteriocin containing 44 amino acid residues and
one intrapeptide disulfide ring. Piscicolin 126 has regions of homology
with some other bacteriocins obtained from lactic acid bacteria and is most
closely related to sakacin P and pediocin PA-1 (levels of identity, 75 and
55%, respectively). Addition of piscicolin 126 to a devilled ham paste test
food system inhibited the growth of L. monocytogenes for at least 14 days.
Piscicolin 126 was more effective than two commercially available
bacteriocin preparations tested in the same system.
Copyright © 1996, American Society for Microbiology
Characterization of the chemical and antimicrobial properties of piscicolin 126, a bacteriocin produced by Carnobacterium piscicola JG126
Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, Australia.
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