A Novel Vibriophage vB_VcaS_HC Containing Lysogeny-Related Gene Has Strong Lytic Ability against Pathogenic Bacteria

文献类型： 外文期刊

第一作者： Li, Chengcheng

作者： Li, Chengcheng;Wang, Zengmeng;Zhao, Jiulong;Wang, Long;Zhang, Yongyu;Li, Chengcheng;Wang, Zengmeng;Zhao, Jiulong;Zhang, Yongyu;Xie, Guosi;Huang, Jie

作者机构：

关键词： Vibrio campbellii; Phage; Lysogeny; RecA; Auxiliary metabolic gene

期刊名称：VIROLOGICA SINICA （ 影响因子：4.327； 五年影响因子：4.08 ）

ISSN： 1674-0769

年卷期：

页码：

收录情况： SCI

摘要： To avoid the negative effects of antibiotics, using phage to prevent animal disease becomes a promising method in aquaculture. Here, a lytic phage provisionally named vB_VcaS_HC that can infect the pathogen (i.e.,Vibrio campbellii18) of prawn was isolated. The phage has an isometric head and a non-contractile tail. During phage infection, the induced host mortality in 5.5 h reached ca. 96%, with a latent period of 1.5 h and a burst size of 172 PFU/cell. It has an 81,566 bp circular dsDNA genome containing 121 open reading frames (ORFs), and ca. 71% of the ORFs are functionally unknown. Comparative genomic and phylogenetic analysis revealed that it is a novel phage belonging toDelepquintavirus,Siphoviridae,Caudovirales. In the phage genome, besides the ordinary genes related to structure assembly and DNA metabolism, there are 10 auxiliary metabolic genes. For the first time, the pyruvate phosphate dikinase (PPDK) gene was found in phages whose product is a key rate-limiting enzyme involving Embden-Meyerhof-Parnas (EMP) reaction. Interestingly, although the phage has a strong bactericidal activity and contains a potential lysogeny related gene, i.e., the recombinase (RecA) gene, we did not find the phage turned into a lysogenic state. Meanwhile, the phage genome does not contain any bacterial virulence gene or antimicrobial resistance gene. This study represents the first comprehensive characterization of a lyticV. campbelliiphage and indicates that it is a promising candidate for the treatment ofV. campbelliiinfections.

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