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A novel quasi-viral agent, MaTu, is a two-component system
S Pastoreková1, Z Závadová, M Kostál
1Institute of Virology, Slovak Academy of Sciences, Bratislava.
Virology
|April 1, 1992
Summary
MaTu, a human mammary tumor-derived agent, comprises two components: exogenous MX and endogenous MN. MN, a cell surface and nuclear protein, is crucial for vesicular stomatitis virus (VSV) pseudotype formation.
Area of Science:
- Oncology
- Virology
- Cell Biology
Background:
- MaTu is a unique quasi-viral agent originating from human mammary tumors.
- It exhibits characteristics of both classical and slow viruses, alongside distinct properties.
- Its complex nature necessitates detailed investigation into its components and interactions.
Purpose of the Study:
- To elucidate the two-component structure of the MaTu agent.
- To characterize the exogenous (MX) and endogenous (MN) components.
- To determine the role of MaTu components in viral pseudotype formation.
Main Methods:
- Utilized monoclonal antibodies (Mabs) for component identification and characterization.
- Investigated protein expression (p58X, p54/58N) in HeLa cells under varying culture conditions.
- Analyzed association of MaTu components with vesicular stomatitis virus (VSV) virions.
Main Results:
- Identified MaTu as a two-component system: exogenous MX (cytoplasmic p58X) and endogenous MN (cell surface/nuclear p54/58N).
- Demonstrated that MN is inducible in HeLa cells by dense culture or MX infection.
- Confirmed p54/58N association with VSV virions, indicating its role in VSV (MaTu) pseudotype formation.
Conclusions:
- MaTu's two-component system, MX and MN, has distinct cellular localizations and properties.
- The endogenous MN component is essential for the formation of VSV pseudotypes.
- This research provides insights into the composition and viral interaction mechanisms of MaTu.