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Genomic analysis and biological characterization of a novel Schitoviridae phage infecting Vibrio alginolyticus

  • Applied Genetics and Molecular Biotechnology
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Abstract

Vibrio alginolyticus is a Gram-negative bacterium commonly associated with mackerel poisoning. A bacteriophage that specifically targets and lyses this bacterium could be employed as a biocontrol agent for treating the bacterial infection or improving the shelf-life of mackerel products. However, only a few well-characterized V. alginolyticus phages have been reported in the literature. In this study, a novel lytic phage, named ΦImVa-1, specifically infecting V. alginolyticus strain ATCC 17749, was isolated from Indian mackerel. The phage has a short latent period of 15 min and a burst size of approximately 66 particles per infected bacterium. ΦImVa-1 remained stable for 2 h at a wide temperature (27–75 °C) and within a pH range of 5 to 10. Transmission electron microscopy revealed that ΦImVa-1 has an icosahedral head of approximately 60 nm in diameter with a short tail, resembling those in the Schitoviridae family. High throughput sequencing and bioinformatics analysis elucidated that ΦImVa-1 has a linear dsDNA genome of 77,479 base pairs (bp), with a G + C content of ~ 38.72% and 110 predicted gene coding regions (106 open reading frames and four tRNAs). The genome contains an extremely large virion-associated RNA polymerase gene and two smaller non-virion-associated RNA polymerase genes, which are hallmarks of schitoviruses. No antibiotic genes were found in the ΦImVa-1 genome. This is the first paper describing the biological properties, morphology, and the complete genome of a V. alginolyticus-infecting schitovirus. When raw mackerel fish flesh slices were treated with ΦImVa-1, the pathogen loads reduced significantly, demonstrating the potential of the phage as a biocontrol agent for V. alginolyticus strain ATCC 17749 in the food.

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Key points

A novel schitovirus infecting Vibrio alginolyticus ATCC 17749 was isolated from Indian mackerel.

The complete genome of the phage was determined, analyzed, and compared with other phages.

The phage is heat stable making it a potential biocontrol agent in extreme environments.

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Data availability

All relevant data are included in this article and its supplementary materials. The nucleotide sequence of the phage genome was deposited to NCBI GenBank and is accessible through the entry record accession no: ON042477.

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Funding

This study was supported by UPM grant (No: UPM/800–3/3/1/GPB/2019/9682500).

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Contributions

ST designed and conducted the experiments, analyzed data, and wrote the manuscript. AMK conceived and designed the experiments, analyzed data, supervised the project, provided resources, reviewed and edited the manuscript. LCC and CLW analyzed data and reviewed the manuscript. JST designed and conducted the experiments. MYIS, HYL, KLH, and ARM provided resources, supervised the project, and reviewed the manuscript. WST conceived and designed the experiments, analyzed data, supervised the project, provided resources, acquired funding, reviewed and edited the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Asif M. Khan or Wen Siang Tan.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Tajuddin, S., Khan, A.M., Chong, L.C. et al. Genomic analysis and biological characterization of a novel Schitoviridae phage infecting Vibrio alginolyticus. Appl Microbiol Biotechnol 107, 749–768 (2023). https://doi.org/10.1007/s00253-022-12312-3

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  • DOI: https://doi.org/10.1007/s00253-022-12312-3

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