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Heterogeneity of p15(E)-related polypeptides expressed by MuLV-infected cells
Abstract:
The p15(E)-related polypeptides of radiation leukemia virus (RadLV)-derived viruses and of cells infected with prototype MuLV were analyzed by immunoprecipitation, SDS-PAGE, and immunofluorescence analyses. It was found that the p15(E)-related molecules of ecotropic and xenotropic viruses derived from RadLV lymphoma cell lines were distinguishable by reactivity with monoclonal anti-p15(E) antibodies and by SDS-PAGE profile. Ecotropic MuLV of RadLV origin encoded the p15(E)a antigen and produced a Pr15(E) of 20K MW. In contrast, xenotropic virus derived from RadLV did not express the p15(E)a antigen and by SDS-PAGE its Pr15(E) migrated at 21K. A previously undescribed, p15(E)-related molecule of 18.5K MW was associated with xenotropic RadLV. These differences were also reproduced by the prototype ecotropic, xenotropic, and dualtropic viruses.
Insights
Researchers analyzed p15(E)-related polypeptides in radiation leukemia virus (RadLV)-derived viruses and Moloney murine leukemia virus (MuLV). Differences in these molecules distinguish ecotropic and xenotropic MuLV strains, aiding in viral characterization.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Radiation leukemia virus (RadLV) and Moloney murine leukemia virus (MuLV) are retroviruses implicated in oncogenesis.
- The p15(E) envelope glycoprotein is a key component of MuLV, involved in viral entry and host interactions.
- Understanding variations in p15(E)-related molecules is crucial for differentiating viral subtypes and their pathogenic potential.
Purpose of the Study:
- To characterize and compare p15(E)-related polypeptides from RadLV-derived and prototype MuLV strains.
- To investigate the molecular distinctions between ecotropic and xenotropic MuLV variants.
- To identify specific viral antigens and molecular weight differences associated with different MuLV tropisms.
Main Methods:
- Immunoprecipitation assays to isolate p15(E)-related proteins.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to analyze protein molecular weights.
- Immunofluorescence analysis to detect viral antigen localization.
- Reactivity testing with monoclonal anti-p15(E) antibodies.
Main Results:
- p15(E)-related molecules from ecotropic and xenotropic RadLV-derived viruses showed distinct reactivity with anti-p15(E) antibodies and different SDS-PAGE profiles.
- Ecotropic MuLV of RadLV origin expressed the p15(E)a antigen and a 20K Pr15(E).
- Xenotropic RadLV did not express p15(E)a, had a 21K Pr15(E), and an associated 18.5K p15(E)-related molecule.
Conclusions:
- Distinct molecular signatures of p15(E)-related polypeptides differentiate ecotropic and xenotropic MuLV.
- These findings aid in the classification and understanding of RadLV and MuLV variants.
- The identification of a novel p15(E)-related molecule in xenotropic RadLV warrants further investigation.