Isolation, characterization and application of a lytic phage vB_VspM_VS1 against Vibrio splendidus biofilm

• Published in: PLOS ONE
• Main Authors: Duan, Xuemei, Jiang, Liming, Guo, Ming, Li, Chenghua
• Other Authors: Dinamarca, M. Alejandro, National Natural Science Foundation of China, Natural Science Foundation of Ningbo, special Fund Project of Education Scientific and Technological Innovation of Gansu Province, General project of Education Department of Zhejiang Province, Science Foundation of Gansu Province of China, Zhejiang Provincial Natural Science Foundation of China, Ningbo Yongjiang Talent Introduction Programme, the K.C. Wong Magna Fund at Ningbo University
• Format: Article in Journal/Newspaper
• Language: English
• Published: Public Library of Science (PLoS) 2023
• Subjects: Crassostrea gigas
• Online Access: http://dx.doi.org/10.1371/journal.pone.0289895; https://dx.plos.org/10.1371/journal.pone.0289895

Vibrio splendidus is a common pathogen in the ocean that infects Apostichopus japonicus , Atlantic salmo n and Crassostrea gigas , leading to a variety of diseases. In this study, a virulent phage vB_VspM_VS1, which infects V . splendidus , was isolated from aquaculture ponds in Dalian, China, and it belongs to the family Straboviridae in the order Caudoviricetes . vB_VspM_VS1 had an adsorption rate of 96% in 15 min, a latent period of 65 min, and a burst size of 140 ± 6 PFU/cell. The complete genome of phage vB_VspM_VS1 consists of a linear double-stranded DNA that is 248,270 bp in length with an average G + C content of 42.5% and 389 putative protein-coding genes; 116 genes have known functions. There are 4 tail fiber genes in the positive and negative strands of the phage vB_VspM_VS1 genome. The protein domain of the phage vB_VspM_VS1 tail fibers was obtained from the Protein Data Bank and the SMART ( http://smart.embl.de ) database. Bacterial challenge tests revealed that the growth of V . splendidus HS0 was apparently inhibited (OD 600 < 0.01) in 12 h at an MOI of 10. In against biofilms, we also showed that the OD 570 value of the vB_VspM_VS1-treated group (MOI = 1) decreased significantly to 0.04 ± 0.01 compared with that of the control group (0.48 ± 0.08) at 24 h. This study characterizes the genome of the phage vB_VspM_VS1 that infects the pathogenic bacterium V . splendidus of A . japonicus .