Production and purification of a bacteriocin peptide produced by Lactococcus sp. strain GM005, isolated from Miso-paste.
Lactococcus sp. GM005 was isolated from Miso-paste and was found to produce a bacteriocin with strong antibacterial activity. A culture of Lactococcus sp. GM005, maintained at 30 degrees C and a constant pH of 6.0, exhibited bacteriocin activity eightfold higher than that of a culture grown under pH-uncontrolled conditions. GM005 bacteriocin was purified to homogeneity on SDS-PAGE by hydrophobic column chromatography and gel filtration. The estimated molecular weight of GM005 bacteriocin was approximately 9.6 kDa based on gel-filtration analysis, and was approximately 2.4 kDa based on tricine-SDS-PAGE analysis, indicating a tetrametric structure. N-terminal amino acid analysis revealed that the N-terminal end was blocked. Amino acid composition analysis revealed a high proportion of hydrophobic amino acid residues and lanthionine. This differs from the composition of some antibiotics. GM005 bacteriocin exhibits a bactericidal activity against Lactobacillus sakei JCM1157T.
Onda
Takumi
T
Food/Brewing Section, The Yamanashi Industrial Technology Center, 2094, Otsu-cho, Kofu, Yamanashi 400-0005, Japan. takumi@yitc.go.jp
Yanagida
Fujitoshi
F
Tsuji
Masao
M
Shinohara
Takashi
T
Yokotsuka
Koki
K
D001430:Bacteriocins / Q000096:biosynthesis* / Q000302:isolation & purification* / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007778:Lactobacillus / Q000187:drug effects / Q000254:growth & development; D017045:Lactococcus / Q000378:metabolism*; D008970:Molecular Weight; D020539:Sequence Analysis, Protein; D013696:Temperature
D001430:Bacteriocins