后鹏飞1,连军强2*,向 丹2*,黄 静1,罗 丹1,唐人杰1,童武林3,苏 柳3
(1.四川省食品发酵工业研究设计院有限公司,成都 611130;
2.成都希望食品有限公司,成都 611430;
3.成都中医药大学,成都 610075)
摘要:本研究通过双层平板法从湖水中分离、纯化出一株大肠杆菌O157:H7烈性噬菌体,并命名为SF08。对其生物学特性、基因组序列及在即食鸡爪中的抑菌效果进行分析。结果表明,SF08由长约124 nm的可收缩尾巴和直径约 76 nm的多面体头部组成。最佳感染复数(Multiplicity of Infection,MOI)为0.01;潜伏期为20 min,裂解期为20~110 min,爆发量为66 PFU/cell;在pH 3~12 和 30~70 ℃条件下能保持较高的活性。基因组全长59 704 bp,G+C含量为56.52%,共有72个开放阅读框(ORF)。SF08在4 ℃下可以极显著地抑制即食鸡爪中模拟污染的大肠杆菌O157:H7(P<0.01)。本研究表明SF08具有较好的生物学特性及安全性,为后续研发和制备天然杀菌剂提供理论基础和参考。
关键词:大肠杆菌O157:H7;噬菌体;生物学特性;全基因组分析
中图分类号:TS201.3 文献标识码:A 文章编号:1674-506X(2024)03-0001-0007
Isolation,Characterization and Application in Food of Escherichia coli O157:H7 Virulent Bacteriophage SF08
HOU Pengfei1, LIAN Junqiang2*, XIANG Dan2*, HUANG Jing1, LUO Dan1, TANG Renjie1, TONG Wulin3, SU Liu3
(1.Sichuan Food and Fermentation Industry Research & Design Institute Co., Ltd., Chengdu 611130, China;
2.Chengdu Xiwang Food Co., Ltd., Chengdu 611430, China;
3.Chengdu University of TCM, Chengdu 610075, China)
Abstract:In this study, a virulent bacteriophage of Escherichia coli O157:H7 was isolated and purified from lake water by double-layer agar plate method, and named SF08. The biological characteristics, genome sequence and antibacterial effect of SF08 in ready-to-eat chicken feet were analyzed. The results showed that SF08 was composed of a retractable tail about 124 nm long and a polyhedral head about 76 nm diameter. The optimal multiplicity of infection (MOI) was 0.01. The latent period was 20 min, the lysis period was 20~110 min, and the burst size was 66 PFU/cell. SF08 could maintain high activity under the range of pH (3~12) and temperatures (30~70 ℃). The total length of the genome was 59 704 bp, the G+C content was 56.52%, and there were 72 open reading frames (ORFs). SF08 could significantly inhibit simulated contaminated Escherichia coli O157:H7 in ready-to-eat chicken feet at 4 ℃ (P<0.01). This study shows that SF08 has good biological characteristics and safety, which provides a theoretical basis and reference for the subsequent development and preparation of Escherichia coli O157:H7 natural fungicides.
Keywords:Escherichia coli O157:H7; bacteriophage; biological characteristics; complete genome analysis
doi:10.3969/j.issn.1674-506X.2024.03-001
收稿日期:2024-03-15
基金项目:四川省科技计划项目(创新人才项目)“基于噬菌体的高效抑菌剂在特色川式预调菜肴中的应用研究”(2023JDRC0036)
作者简介:后鹏飞(1995-),男,硕士,工程师。研究方向:畜产品加工与安全。
*通信作者:连军强(1974-),男,硕士,高级工程师。研究方向:食品工程;向丹(1985-),女,硕士,高级工程师。研究方向:食品工程。
引用格式:后鹏飞,连军强,向丹,等.大肠杆菌O157:H7烈性噬菌体SF08的分离、表征及在食品中的应用[J].食品与发酵科技, 2024,60(3):1-6,54.