A novel subtilin-like lantibiotics subtilin JS-4 produced by Bacillus subtilis JS-4, and its antibacterial mechanism against Listeria monocytogenes
文献类型： 外文期刊
作者： Wei, Zhaohui 1 ; Shan, Chengjun 1 ; Zhang, Lixia 1 ; Ge, Da'e 1 ; Wang, Ying 1 ; Xia, Xiudong 1 ; Liu, Xiaoli 1 ; Zhou, J 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Argoprod Proc, Nanjing 210014, Peoples R China
2.Jiangsu Univ, Sch Food & Biol Engn, Zhenjiang 212013, Jiangsu, Peoples R China
关键词： Subtilin JS-4; Bacteriocin; Bacillus subtilis; Listeria monocytogenes; Antibacterial mechanism
期刊名称：LWT-FOOD SCIENCE AND TECHNOLOGY （ 影响因子：4.006； 五年影响因子：4.385 ）
ISSN： 0023-6438
年卷期： 2021 年 142 卷
页码：
收录情况： SCI
摘要： The foodborne pathogen Listeria monocytogenes is the major cause of listeriosis. We isolated a novel lantibiotic subtilin JS-4 from Bacillus subtilis JS-4 and analyzed its effects against L. monocytogenes. The bacteriocin was extracted with n-butanol, purified by Sephadex LH-20 gel-filtration chromatography and semi-preparative RP-HPLC, and characterized by MALDI-TOF-MS and MALDI-TOF-MS/MS. The molecular mass of subtilin JS-4 was 3346.6 Da, and its amino acid sequence was similar to that of subtilin except for the Ala 15 -> Val and Leu 24 -> Ile substitutions. Subtilin JS-4 showed good thermal and pH stability but was inactivated by proteases. It also showed a broad antimicrobial spectrum against Gram-positive bacteria. The antibacterial mechanism of subtilin JS-4 against L. monocytogenes was investigated using confocal laser-scanning microscopy, scanning and transmission electron microscopy, which revealed that subtilin JS-4 increased cell membrane permeability, triggered K+ leakage and pore formation, damaged cell membrane integrity, altered cell morphology and intracellular organization. Taken together, subtilin JS-4 is highly effective against foodborne pathogens, and should be considered as an antibacterial preservative in the food industry.
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