生物
肠沙门氏菌
溶解循环
微生物学
毒力
噬菌体
血清型
沙门氏菌
大肠杆菌
细菌
基因组
致病菌
病毒学
基因
病毒
遗传学
作者
Yan Lin,Yankun Liu,Yuyu Zhang,Wuzhou Yuan,Dongyang Wang,Weiyun Zhu
标识
DOI:10.1016/j.vetmic.2023.109822
摘要
Bacteriophages are a promising alternative for the control of pathogenic bacteria. In this study, we isolated a virulent bacteriophage, S19cd, from pig gut that could infect both a non-pathogenic bacteria Escherichia coli 44 (EC44) and two pathogenic bacterial strains (ATCC 13312 (SC13312) and CICC 21493 (SC21493)) of Salmonella enterica serovar Choleraesuis (SC). S19cd exhibited strong lytic ability in both SC13312 and SC21493 with an optimal multiplicity of infection (MOI) of 10−6 and 10−5, respectively, and inhibited their growth at an MOI of 10−7 within 24 h. Mice pre-treated with S19cd exhibited protection against the SC13312 challenge. Moreover, S19cd has good heat resistance (80 ℃) and pH tolerance (pH 3–12). Genome analysis revealed that S19cd belongs to the Felixounavirus genus and does not contain any virulence or drug-resistance-related genes. Additionally, S19cd encodes an adenine-specific methyltransferase that has no similarity to methyltransferases from other Felixounavirus phages and shares limited similarity with other methyltransferases in the NCBI protein database. Metagenomic analysis of S19cd genomes from 500 pigs revealed that S19cd-like phages may be widespread in Chinese pig gut. In conclusion, S19cd can be a potential phage therapy targeting SC infections.
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