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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
Published on: June 11, 2015
Genomic and Biological Insights of Bacteriophage ΦBc24 Targeting Bacillus cereus
Nam Khang Tran1,2, Pham Thi Lanh1, Trang Trinh Thu1
1Department of Molecular Microbiology, Institute of Biology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi 100000, Vietnam.
Abstract:
Foodborne illnesses associated with Bacillus cereus represent a persistent public health concern. In this study, we described the isolation and characterization of a novel bacteriophage, ΦBc24, from mud samples, which showed lytic activity against foodborne pathogen B. cereus. Transmission electron microscopy revealed that ΦBc24 exhibited a myovirus morphotype. Biological assays demonstrated that its narrow host range was restricted to B. cereus strains and efficient lytic activity, characterized by a latent period of 10 min and a burst size of 40 PFU per infected cell. The phage exhibited high physicochemical stability, tolerating pH values of 2-12, temperatures of 4-50 °C, salinity up to 1 M NaCl, and ultraviolet exposure, while effectively suppressing host bacterial growth for up to six hours. Whole-genome sequencing showed that phage ΦBc24 possessed a double-stranded DNA genome of 160,311 bp, with 39.48% GC content, and 269 predicted open reading frames (ORFs). Remarkably, 11 tRNA genes were identified, whereas no genes associated with lysogeny, virulence, or antimicrobial resistance were detected. Phylogenetic analysis suggested that ΦBc24 belongs to the genus Caeruleovirus, subfamily Bastillevirinae, family Herelleviridae. Taken together, these results highlight the biological robustness and genomic safety of ΦBc24, supporting its potential as a biocontrol candidate against the foodborne pathogen B. cereus.
Insights
A novel bacteriophage, PhiBc24, was isolated and characterized for its ability to target the foodborne pathogen Bacillus cereus. This robust phage shows potential for biocontrol applications against B. cereus.
Area of Science:
- Microbiology
- Virology
- Food Safety
Background:
- Foodborne illnesses caused by Bacillus cereus pose a significant public health challenge.
- Effective control strategies against B. cereus are crucial for food safety.
Purpose of the Study:
- To isolate and characterize a novel bacteriophage with lytic activity against B. cereus.
- To evaluate the potential of the bacteriophage as a biocontrol agent.
Main Methods:
- Isolation of bacteriophage from mud samples.
- Transmission electron microscopy for morphotype analysis.
- Biological assays for host range, lytic activity, and stability.
- Whole-genome sequencing and phylogenetic analysis.
Main Results:
- A novel myovirus bacteriophage, PhiBc24, was isolated and showed efficient lytic activity against B. cereus.
- PhiBc24 demonstrated high stability across a wide range of pH, temperature, salinity, and UV exposure.
- Genomic analysis revealed no genes associated with lysogeny, virulence, or antimicrobial resistance, indicating genomic safety.
Conclusions:
- PhiBc24 exhibits robust biological and genomic characteristics, making it a promising candidate for biocontrol.
- The phage's safety profile supports its potential application in controlling foodborne Bacillus cereus.
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