Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (12): 5228-5239.doi: 10.11843/j.issn.0366-6964.2023.12.032

• BASIC VETERINARY MEDICINE • Previous Articles     Next Articles

Biological Characteristics and Genome Analysis of Salmonella Phage SP3

HAN Shengyi1,3, LI Lingxia2,3, LI Shuping1,3, HU Guoyuan1,3, LI Shengqing1,3*   

  1. 1. Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810003, China;
    2. College of Agriculture and Animal Husbandry, Qinghai University, Xining 810003, China;
    3. Qinghai Provincial Key Laboratory of Pathogen Diagnosis for Animal Diseases and Green Technical Research for Prevention and Control, Xining 810003, China
  • Received:2023-04-06 Online:2023-12-23 Published:2023-12-26

Abstract: This study aimed to isolate virulent Salmonella phages and provide a new biological agent for the prevention and control of bacterial diseases. The phage with Salmonella as host was isolated, and then we investigated the biological characteristics and genome features. The result showed that a virulent phage named SP3 was isolated, which charactered with a regular polyhedron head with approximately 70 nm in diameter and a long contractile tail with 130 nm in length. SP3 was a broad-spectrum phage that can lysate a total of 8 Salmonella strains in 3 serotypes. In addition, the optimal MOI of SP3 was 0.000 1, the incubation period was 40 min, and the outbreak period was 40-160 min. We also found that SP3 is stable under the pH ranges of 4 to 11 and temperatures ≤50 ℃, respectively. The full length of phage SP3 genome was 88 039 bp, the GC content was 38.85%, and it contained 22 tRNAs and 130 ORFs, 32 of which encoded proteins with known functions, but did not carry genes related to drug resistance, virulence and lysogen. SP3 was closely related to E. coli phage and Salmonella phage, both of which belonged to Ounavirinae subfamily and Felixounavirus genus, and genomic rearrangements were also detected. The phage SP3 has strong adaptability to the environment and clear genetic background, which is expected to become an antibiotic substitute for Salmonella prevention and control.

Key words: Salmonella, phage, biological characteristics, genome

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