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Potential aquaculture probiont Lactococcus lactis TW34 produces nisin Z and inhibits the fish pathogen Lactococcus garvieae
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Potential aquaculture probiont Lactococcus lactis TW34 produces nisin Z and inhibits the fish pathogen Lactococcus garvieae
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Journal Article
Potential aquaculture probiont Lactococcus lactis TW34 produces nisin Z and inhibits the fish pathogen Lactococcus garvieae
2015
Overview
Bacteriocin-producing Lactococcus lactis TW34 was isolated from marine fish. TW34 bacteriocin inhibited the growth of the fish pathogen Lactococcus garvieae at 5 AU/ml (minimum inhibitory concentration), whereas the minimum bactericidal concentration was 10 AU/ml. Addition of TW34 bacteriocin to L. garvieae cultures resulted in a decrease of six orders of magnitude of viable cells counts demonstrating a bactericidal mode of action. The direct detection of the bacteriocin activity by Tricine-SDS-PAGE showed an active peptide with a molecular mass ca. 4.5 kDa. The analysis by MALDI-TOF-MS detected a strong signal at m/z 2,351.2 that corresponded to the nisin leader peptide mass without the initiating methionine, whose sequence STKDFNLDLVSVSKKDSGASPR was confirmed by MS/MS. Sequence analysis of nisin structural gene confirmed that L. lactis TW34 was a nisin Z producer. This nisin Z-producing strain with probiotic properties might be considered as an alternative in the prevention of lactococcosis, a global disease in aquaculture systems.
Publisher
Springer-Verlag,Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Animals
/ Anti-Bacterial Agents - biosynthesis
/ Anti-Bacterial Agents - metabolism
/ Anti-Bacterial Agents - pharmacology
/ Bacteria
/ Biomedical and Life Sciences
/ Ecology
/ Electrophoresis, Polyacrylamide Gel
/ Fish Diseases - microbiology
/ Fish Diseases - prevention & control
/ Gram-Positive Bacterial Infections - microbiology
/ Gram-Positive Bacterial Infections - prevention & control
/ Gram-Positive Bacterial Infections - veterinary
/ Lactococcus lactis - genetics
/ Lactococcus lactis - physiology
/ Lactococcus lactis subsp. lactis
/ Marine
/ matrix-assisted laser desorption-ionization mass spectrometry
/ minimum inhibitory concentration
/ nisin
/ Nisin - analogs & derivatives
/ Peptides
/ Trout
