期刊
JOURNAL OF APPLIED MICROBIOLOGY
卷 105, 期 3, 页码 681-690出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2672.2008.03798.x
关键词
bacteriocin; durancin; enterocin; Enterococcus durans; lactic acid bacteria
资金
- Japan Educational Exchanges and Services
- Japan Society for the Promotion of Science (JSPS)
Aims: To characterize the novel bacteriocin produced by Enterococcus durans. Methods and Results: Enterococcus durans QU 49 was isolated from carrot and expressed bactericidal activity over 20-43 degrees C. Bacteriocins were purified to homogeneity using the three-step purification method, one of which, termed durancin TW-49M, was an enterocin B-homologous peptide with most identical residues occurring in the N-terminus. Durancin TW-49M was more tolerant in acidic than in alkali. DNA sequencing analysis revealed durancin TW-49M was translated as a prepeptide of the double-glycine type. Durancin TW-49M and enterocin B expressed similar antimicrobial spectra, in which no significant variation due to the diversity in their C-termini was observed. Conclusions: Durancin TW-49M, a novel nonpediocin-like class II bacteriocin, was characterized to the amino acid and genetic levels. The diverse C-terminal parts of durancin TW-49M and enterocin B were hardly to be suggested as the place determining the target cell specificity. Significance and Impact of the Study: This is the first and comprehensive study of a novel bacteriocin produced by Ent. durans. The high homology at the N-terminal halves between durancin TW-49M and enterocin B makes them suitable to study the structure-function relationship of bacteriocins and their immunity proteins.
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