Isolation and Characterization of Lytic Phage vB_EcoM_JS09 against Clinically Isolated Antibiotic-Resistant Avian Pathogenic Escherichia coli and Enterotoxigenic Escherichia coli

文献类型： 外文期刊

第一作者： Zhou, Yan

作者： Zhou, Yan;Bao, Hongduo;Zhang, Hui;Wang, Ran

作者机构：

关键词： Avian pathogenic Escherichia coli;Enterotoxigenic Escherichia coli;Antibiotic resistance;Lytic coliphage;T4-like phage;Genome analysis;gp37;Receptor-binding protein

期刊名称：INTERVIROLOGY （ 影响因子：1.763； 五年影响因子：1.929 ）

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收录情况： SCI

摘要： Objectives: To characterize the lytic coliphage vB_EcoM_JS09 (phage JS09) isolated from sewage samples of a swine farm in Jiangsu Province, China, which infects antibiotic-resistant avian pathogenic Escherichia coli (APEC) and enterotoxigenic E. coli (ETEC). Methods and Results: Transmission electron microscopy revealed that phage JS09 has an isometric icosahedral head (76 nm in diameter) and a long contractile tail (140 nm in length) and features a T-even morphology. Its latent period was 30 min and the average burst size was 79 phage particles per infected cell. It attached to the host cells within 9 min. JS09 could infect 16 clinically isolated APEC and ETEC strains and the laboratory-engineered E. coli K and B strains. Ten of the clinical isolates of E. coli were resistant to antibiotics. At a multiplicity of infection of 10, 3, 1, or 0.3, the phage caused rapid cell lysis within 2 h, resulting in 5- to 10-fold reductions in cell concentration. Sequencing of the JS09 genonne revealed a 169.148-kb linear but circularly permuted and terminally redundant dsDNA with 37.98% G+C content. Two hundred seventy-three open reading frames were predicted to be coding sequences, 135 of which were functionally defined and organized in a modular format which includes modules for DNA replication, DNA packaging, structural proteins, and host cell lysis proteins. Phage JS09 is assigned to the Caudovirales order (Myoviridae phage family), and it is considered a T4-like phage based on its morphological, genomic, and growth characteristics. JS09 gp37, a receptor-binding protein (RBP) important for host cell infection, shares little homology with other RBP in the NCBI database, which suggests that the variable regions in gp37 determine the unique host range of phage JS09. Protein sequence comparisons cluster the putative 'RBP' of JS09 much more closely with those of Yersinia phage phiD1, phage Tula, and phage Tulb. Conclusions:A novel lytic coliphage named JS09 was isolated from sewage samples of a swine farm in Jiangsu Province, China. It could infect antibiotic-resistant APEC and ETEC. The morphological, genomic, and growth characteristics of JS09 were studied, and this will be helpful for phage therapy in controlling diseases caused by APEC and ETEC. (c) 2015 S. Karger AG, Basel

分类号： Q93

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