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A rapid procedure for the purification of avian encephalomyelitis viruses
Abstract:
A rapid procedure for the purification of egg-grown or field preparations of avian encephalomyelitis virus (AEV) of neural origin is described. Extracts of infected tissues were clarified and then partly purified with trichlorotrifluorethane (Freon TF), and the virus present was concentrated with polyethylene glycol. The concentrates were then re-extracted with Freon, and a portion was labeled with 125iodine. During subsequent purification steps, virus could be readily detected by monitoring for radioactivity, thus eliminating the need to determine the infectivity in individual fractions or to examine for the presence of virions by electron microscopy. Final purification was achieved by cesium-chloride equilibrium or sucrose-velocity-gradient centrifugation. Virus purified in this manner was shown to be free of tissue debris, to be specific for AEV by immune electron microscopy, and to possess structural proteins characteristic of picornaviruses.
Insights
This study presents a rapid method for purifying avian encephalomyelitis virus (AEV). The new technique uses radiolabeling for efficient detection, simplifying AEV purification from infected tissues.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Avian encephalomyelitis virus (AEV) causes significant disease in poultry.
- Efficient purification of AEV is crucial for research and diagnostics.
- Existing purification methods can be time-consuming and labor-intensive.
Purpose of the Study:
- To develop a rapid and efficient purification procedure for avian encephalomyelitis virus (AEV).
- To simplify the detection of purified AEV during the purification process.
- To characterize the purified AEV for structural integrity and specificity.
Main Methods:
- Tissue extracts were clarified and partially purified using trichlorotrifluorethane (Freon TF).
- Virus was concentrated using polyethylene glycol and re-extracted with Freon.
- A portion of the virus was radiolabeled with 125iodine for detection.
- Final purification employed cesium-chloride equilibrium or sucrose-velocity-gradient centrifugation.
Main Results:
- Radiolabeling allowed for easy detection of virus in purification fractions, eliminating the need for infectivity assays or electron microscopy.
- Purified AEV was free of tissue debris.
- Immune electron microscopy confirmed the specificity of the purified virus for AEV.
- Structural proteins of the purified virus were characteristic of picornaviruses.
Conclusions:
- A rapid and effective method for purifying avian encephalomyelitis virus (AEV) has been established.
- Radiolabeling significantly streamlines the purification process.
- The purified AEV is suitable for further research and diagnostic applications.