宽谱大肠杆菌O157∶H7 CVCC4050噬菌体vB_EcoM_GXBP08的分离鉴定及特性分析

doi:10.16431/j.cnki.1671-7236.2022.07.032

Abstract

Abstract: 【Objective】 This study was aimed to explore the biological characteristics and genome characteristics of broad-spectrum Escherichia coli O157∶H7 phage.【Method】 The broad-spectrum Escherichia coli O157∶H7 lytic phage was seperated from a swine farm sewage in Nanning of Guangxi using the double-layer agar culture method.The host range and the corresponding titers of phage were determined through the methods of spot tests and plaque tests.The methods of transmission electron microscope observation,determination of the best multiplicity of infection in the plural,one-step growth curve drawing,thermal sensitivity and pH stability evaluation,sterilization experiment and the whole genome sequencing were used to analyze the morphological features,biological characteristics and the whole genomic characteristics of phage.【Result】 A broad-spectrum lytic phage against Escherichia coli O157∶H7 was successfully isolated and purified which was named as vB_EcoM_GXBP08.Phage vB_EcoM_GXBP08 could lyse 14 Escherichia coli strains with high efficiency,and the phage titers could reach 10⁹ to 10¹⁰ PFU/mL.Using Escherichia coli O157∶H7 CVCC4050 as host bacteria,the optimal multiplicity of infection (MOI) of phage vB_EcoM_GXBP08 was 1.One-step growth curve indicated that the latent period of vB_EcoM_GXBP08 was 20 min,the outbreak period was 50 min,and the outbreak quantity was 154 PFU/cell. The tolerable temperature range of phage vB_EcoM_GXBP08 was 30 to 70 ℃,and it could maintain activity at pH 4.0 to pH 10.0.The results of bactericidal experiment against CVCC4050 showed that phage vB_EcoM_GXBP08 had good germicidal efficacy when MOI was 1.According to transmission electron microscope observation and the whole genome analysis,phage vB_EcoM_GXBP08 belonged to Caudovirales order,Myoviridae family,T4-like Phagus,which had a genome consisting of 108 114 bp with a GC content of 36.23%.Phage vB_EcoM_GXBP08 genome harbored 8 CDS associated with lysis proteins and lacked virulence genes and drug resistance genes associated with antibiotic resistance,toxins and virulence factors.【Conclusion】 Phage vB_EcoM_GXBP08 had a broad host range,high titer,good thermal stability and acid-base stability,and a strong bactericidal effect in liquid medium.The results provided reference for the development of broad-spectrum phage and its application in the prevention and treatment of Escherichia coli O157∶H7 infection in food industry and breeding industry.

Key words: Escherichia coli O157∶H7; phage; biological characteristics; the whole genomic analysis

CLC Number:

S852.61⁺2

ZHOU Yuqing, MA Dongxin, WU Jie, WANG Xiaoye. Isolation,Identification and Characterization Analysis of Broad-spectrum Escherichia coli O157∶H7 CVCC4050 Phage vB_EcoM_GXBP08[J]. China Animal Husbandry and Veterinary Medicine, 2022, 49(7): 2735-2745.

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Isolation,Identification and Characterization Analysis of Broad-spectrum Escherichia coli O157∶H7 CVCC4050 Phage vB_EcoM_GXBP08

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