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Biochemical and immunological characterization of murine leukemia viruses that are paralysis-inducing in rats
S Shibamura1, K Kai, T Akatsuka
1Research Institute of Dai-Ichi Seiyaku Co. Ltd., Tokyo.
Abstract:
The molecular size and pI of the viral structural proteins of four PVC viruses (PVC111, PVC211, PVC321 and PVC441) were compared by single or two-dimensional polyacrylamide gel electrophoresis. PVC111 had slightly larger p15E and gPr85 molecules (about 0.5 kilodalton) than did the other PVC viruses. On the other hand, the virion structural proteins p30, p15, p12E and p12 from all the viruses had the same molecular sizes and pIs. The gp70s and p10s from all the viruses showed the same molecular sizes. A monoclonal antibody to gp70 of PVC321 virus recognized the gp70s of all PVC viruses, but not the gp70s of four clones of the wild mouse ecotropic viruses, Friend murine leukemia viruses (F-MuLV), AKR ecotropic MuLV, dual-tropic F-MuLV or NZB endogenous xenotropic MuLV, revealing that these four PVC viruses are homologous with each other, but distinct from the known mouse retroviruses.
Insights
Four PVC viruses share homologous structural proteins, distinct from known mouse retroviruses. Protein analysis revealed minor size differences in PVC111, but overall similarity among PVC viruses.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Understanding the molecular characteristics of retroviruses is crucial for disease research.
- Previous studies have characterized various retroviral proteins, but comparative analysis of PVC viruses is limited.
Purpose of the Study:
- To compare the molecular size and isoelectric point (pI) of structural proteins from four PVC viruses.
- To determine the antigenic relationship of the gp70 protein among PVC viruses and other mouse retroviruses.
Main Methods:
- Single and two-dimensional polyacrylamide gel electrophoresis were employed to analyze viral structural proteins.
- A monoclonal antibody against the gp70 protein of PVC321 virus was used for immunoprecipitation assays.
Main Results:
- Structural proteins p30, p15, p12E, p12, gp70s, and p10s showed consistent molecular sizes and pIs across all four PVC viruses.
- PVC111 exhibited slightly larger p15E and gPr85 molecules compared to the other PVC viruses.
- The monoclonal antibody recognized gp70s from all PVC viruses, confirming their homology, but did not react with gp70s from various mouse retroviruses (F-MuLV, AKR ecotropic MuLV, etc.), indicating distinctness.
Conclusions:
- The four PVC viruses analyzed are molecularly homologous to each other regarding their structural proteins.
- These PVC viruses are antigenically distinct from known mouse retroviruses, particularly in their gp70 envelope glycoproteins.
- The findings contribute to the classification and understanding of PVC viruses within the retroviral family.