TY - JOUR
T1 - Identification of Lactococcus-Specific Bacteriocins Produced by Lactococcal Isolates, and the Discovery of a Novel Bacteriocin, Lactococcin Z
AU - Ishibashi, Naoki
AU - Seto, Hiromi
AU - Koga, Shoko
AU - Zendo, Takeshi
AU - Sonomoto, Kenji
N1 - Funding Information:
This work was partially supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant No. 24380051.
Publisher Copyright:
© 2015, Springer Science+Business Media New York.
PY - 2015/9/27
Y1 - 2015/9/27
N2 - Lactic acid bacteria that produce Lactococcus-specific bacteriocins were isolated and identified as Lactococcus lactis from fresh corn or lettuce. Among them, four isolates were identified as lactococcin Q producers. Seven isolates showed antimicrobial activity against a lactococcin Q producer, L. lactis QU 4, as well as against nisin Z and lacticin Q producers belonging to L. lactis. Strain QU 7 was selected as a standard strain and showed no cross-immunity to lactococcin Q or other lactococcal bacteriocins. The bacteriocin produced by strain QU 7 was purified in three chromatographic steps, and its molecular mass was determined to be 5041.35 Da. The amino acid sequence analysis revealed that it is a novel class IId bacteriocin, referred to as lactococcin Z. It consisted of 45 amino acid residues. The lczA gene encoding the prepeptide of lactococcin Z showed homology to lactococcins A, B, and M. Thus, this report demonstrates a new example of Lactococcus-specific bacteriocins.
AB - Lactic acid bacteria that produce Lactococcus-specific bacteriocins were isolated and identified as Lactococcus lactis from fresh corn or lettuce. Among them, four isolates were identified as lactococcin Q producers. Seven isolates showed antimicrobial activity against a lactococcin Q producer, L. lactis QU 4, as well as against nisin Z and lacticin Q producers belonging to L. lactis. Strain QU 7 was selected as a standard strain and showed no cross-immunity to lactococcin Q or other lactococcal bacteriocins. The bacteriocin produced by strain QU 7 was purified in three chromatographic steps, and its molecular mass was determined to be 5041.35 Da. The amino acid sequence analysis revealed that it is a novel class IId bacteriocin, referred to as lactococcin Z. It consisted of 45 amino acid residues. The lczA gene encoding the prepeptide of lactococcin Z showed homology to lactococcins A, B, and M. Thus, this report demonstrates a new example of Lactococcus-specific bacteriocins.
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U2 - 10.1007/s12602-015-9196-4
DO - 10.1007/s12602-015-9196-4
M3 - Article
C2 - 26093857
AN - SCOPUS:84938952282
VL - 7
SP - 222
EP - 231
JO - Probiotics and Antimicrobial Proteins
JF - Probiotics and Antimicrobial Proteins
SN - 1867-1306
IS - 3
ER -