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Purification of Channel Catfish virus, a fish herpesvirus
Canadian Journal of Microbiology
|November 1, 1978
Abstract:
Channel Catfish virus was highly purified from host cells by precipitation with PEG-6000 and isopycnic centrifugation in a metrizamide gradient. As calculated from reconstruction experiments, only 0.09 and 0.05% respectively of the host DNA and the host proteins were recovered at the position of the viral band. The final recovery of infectivity was about 30%. Electron microscopy showed mostly intact viral particles.
Insights
Highly purified Channel Catfish virus (CCV) was obtained using PEG-6000 precipitation and metrizamide gradient centrifugation. This method achieved high purity, preserving viral infectivity and structure for further research.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Channel Catfish virus (CCV) is a significant pathogen affecting aquaculture.
- Efficient purification of CCV is crucial for studying its structure and replication.
- Previous purification methods may have limitations in purity or yield.
Purpose of the Study:
- To develop and optimize a high-yield purification protocol for Channel Catfish virus.
- To assess the purity and integrity of the purified virus.
- To ensure the infectivity of the purified CCV for downstream applications.
Main Methods:
- Purification of CCV from infected host cells using polyethylene glycol (PEG-6000) precipitation.
- Isopycnic centrifugation in a metrizamide density gradient.
- Quantification of residual host DNA and proteins via reconstruction experiments.
- Assessment of viral infectivity and particle integrity using electron microscopy.
Main Results:
- High purity of CCV achieved, with minimal contamination by host DNA (0.09%) and host proteins (0.05%).
- Approximately 30% of the initial viral infectivity was recovered after purification.
- Electron microscopy confirmed the presence of predominantly intact viral particles.
Conclusions:
- The combined method of PEG-6000 precipitation and metrizamide gradient centrifugation is effective for purifying Channel Catfish virus.
- The protocol yields highly pure viral particles while retaining significant infectivity.
- This purified CCV is suitable for detailed structural and functional analyses.