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Methanol precipitation of transmissible gastroenteritis virus
Abstract:
Methanol precipitation of transmissible gastroenteritis virus was tested at Ph 4.0, 5.0, 6.0, and 7.0 and at methanol concentrations of 15%, 25%, and 30%. Supernatant and precipitate fractions were tested for complement-fixing and agar-diffusion soluble antigens and plaque-forming units, and were examined by electron microscopy. Virus could be obtained free of detectable agar-diffusion antigens and most of the complement-fixing antigens. Most of the virions were without peplomers after methanol treatment but they retained infectivity.
Insights
Methanol precipitation effectively purified transmissible gastroenteritis virus (TGEV), removing most antigens while preserving infectivity. This method offers a way to obtain purified TGEV for further research.
Area of Science:
- Virology
- Biochemistry
- Molecular Biology
Background:
- Transmissible gastroenteritis virus (TGEV) is a significant pathogen in swine.
- Efficient purification methods are crucial for studying viral structure and function.
- Antigen removal is important for developing sensitive diagnostic assays and vaccines.
Purpose of the Study:
- To evaluate methanol precipitation as a method for purifying TGEV.
- To assess the impact of methanol precipitation on viral antigens and infectivity.
- To characterize the structural changes in TGEV virions after methanol treatment.
Main Methods:
- TGEV was precipitated using methanol at varying pH (4.0-7.0) and concentrations (15%-30%).
- Supernatant and precipitate fractions were analyzed for soluble antigens (complement-fixing and agar-diffusion).
- Viral infectivity was quantified using plaque-forming units (PFU), and virion structure was examined by electron microscopy.
Main Results:
- Methanol precipitation successfully separated TGEV from most detectable agar-diffusion antigens and complement-fixing antigens.
- The majority of TGEV virions lost their peplomers (surface projections) following methanol treatment.
- Despite peplomer loss, the treated TGEV retained its infectivity.
Conclusions:
- Methanol precipitation is a viable technique for purifying TGEV, significantly reducing antigen load.
- The method preserves viral infectivity, suggesting potential applications in vaccine development or diagnostic reagent preparation.
- Structural alterations, specifically peplomer removal, indicate methanol's effect on the viral envelope.