vB_EcoS_IME347 a novel T1-like Escherichia coli bacteriophage

Journal of Basic Microbiology
Ping LiJingxue Wang

Abstract

Advances in phage therapy and its application require more information on phage genome characteristics and host-phage interaction mechanisms. In this study, a so far unknown T1-like Escherichia coli phage was identified and named vB_EcoS_IME347 (IME347). The genome length of phage IME347 is 50,048 bp with a G + C content of 49.7%. BLASTn alignment showed that the phage has its highest homology (identity 78%, query cover 72%) with phage SRT8 (GenBank: MF996376). Electron microscopy showed that phage IME347 has an icosahedral head and a long non-contractiled tail, features of the family Siphoviridae. Phylogenetic analysis of the large subunit of the terminal enzyme and tail fiber protein revealed that phage IME347 is a novel member of the T1 virus. Furthermore, through comparative genomics, silencing mutation, phage spotting assay, and phage adsorption assay, an E. coli BL21 TonB-dependent receptor YncD was identified to be responsible for phage IME347 adsorption and entry. The identification of the phage receptor YncD enriches the phage receptor database and provides a theoretical basis for bacteriophage therapy.

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