Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (9): 127-135.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1549

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Biological Characteristics and Genome Analysis of a Novel Multidrug-resistant Shigella flexneri Phage

WEN Chang(), LIU Chen, LU Shi-yun, XU Zhong-bing, AI Chao-fan, LIAO Han-peng(), ZHOU Shun-gui   

  1. Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002
  • Received:2021-12-14 Online:2022-09-26 Published:2022-10-11
  • Contact: LIAO Han-peng E-mail:2742707020@qq.com;lhp91@126.com

Abstract:

Antibiotic resistance of bacteria caused by over use and abuse of antibiotics has been more and more seriously,and phage therapy as an precision treatment to treat multi-drug-resistant pathogens has being received more attentions. Double-layer agar plate method was applied to isolate a phage P300,a multi-drug resistant Shigella flexneri,from activated sludge and identified as Myoviridae. The measurement of biological characteristics demonstrated that the optimal multiplicity of infection(MOI)of phage P003 was 10,and the latent period was 10 min. Phage P003 remained active under the conditions of 4-70℃ and pH 3.0-10.0. The whole genome sequencing of phage P003 revealed that the length was 68 721 bp,contained 99 ORFs and 46.14% GC content,and no known drug resistance genes and virulence genes were discovered. Whole genome multi-sequence linear comparison and phylogenetic tree analysis showed that P003 was highly similar to Escherichia coli phage,but it cannot infect E. coli,indicating that P003 was a novel phage. In sum,a novel multidrug resistant phage S. flexneri P003 is isolated from active sludge,which may provide a new strain resource for the treatment of multidrug-resistant pathogen S. flexneri infection by phage therapy in the future.

Key words: phage, Shigella flexneri, antibiotic resistance, biological characteristics, whole genome sequencing