Isolation and lytic activity of the Listeria bacteriophage endolysin LysZ5 against Listeria monocytogenes in soya milk

文献类型： 外文期刊

第一作者： Zhang, Hui

作者： Zhang, Hui;Bao, Hongduo;Wang, Ran;Billington, Craig;Hudson, J. Andrew

作者机构：

关键词： Listeria phage;Endolysin;Biocontrol

期刊名称：FOOD MICROBIOLOGY （ 影响因子：5.516； 五年影响因子：5.68 ）

ISSN： 0740-0020

年卷期： 2012 年 31 卷 1 期

页码：

收录情况： SCI

摘要： The endolysin gene (IysZ5) from the genome of the Listeria monocytogenes phage FWLLm3 was cloned in Escherichia colt and characterized. Comparative sequence analysis revealed that IysZ5 resembled the murein hydrolase ply511 encoded by L. monocytogenes phage A511. The encoded protein LysZ5 had a predicted molecular mass of 35.8 kDa and was expressed in E. colt as an N-terminal fusion protein of 41.5 kDa. Addition of purified fusion protein to lawns of indicator bacteria showed that LysZ5 could lyse L. monocytogenes, Listeria innocua and Listeria welshimeri, but not Staphylococcus aureus or Enterococcus faecalis. The purified protein was able to kill L. monocytogenes growing in soya milk, with the pathogen concentration reduced by more than 4 log(10) CFU ml(-1) after 3 h incubation at 4 degrees C. As far as we know, this is the first report of a Listeria phage endolysin to control pathogens in soya milk and to demonstrate endolysin activity in foods at refrigeration temperatures. Moreover, LysZ5 may also be useful for biocontrol in other ready-to-eat foods. (C) 2012 Elsevier Ltd. All rights reserved.

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