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New type B retrovirus isolates associated with kinetochores and centrioles of the host cell
Abstract:
Two new virus isolates, M432 and M832, obtained from the Southeast Asian mouse have been characterized morphologically with respect to their composition and intracellular assembly. The mature virions resemble in certain respects the type B murine retroviruses. The new isolates, however, have an intracellular precursor, a type A particle, closely associated with the mitotic apparatus. The intracellular transport of the type A particles to the cell surface, where they are released by budding, is closely associated with the microtubule system of the cell.
Insights
Two novel Southeast Asian mouse retroviruses were identified. Their intracellular assembly involves a unique type A particle linked to cell division and microtubule transport before budding.
Area of Science:
- Virology
- Cell Biology
- Microbiology
Background:
- Murine retroviruses are a significant area of study in virology.
- Understanding viral assembly and transport is crucial for developing antiviral strategies.
Purpose of the Study:
- To characterize two new virus isolates from Southeast Asian mice.
- To investigate the morphology, composition, and intracellular assembly of these novel viruses.
Main Methods:
- Morphological characterization of virus isolates M432 and M832.
- Analysis of intracellular precursor particles and their association with cellular structures.
Main Results:
- Identified two new retrovirus isolates, M432 and M832, from Southeast Asian mice.
- Observed that mature virions share similarities with type B murine retroviruses.
- Discovered a unique intracellular precursor, a type A particle, associated with the mitotic apparatus.
- Demonstrated that intracellular transport of type A particles involves the microtubule system and culminates in cell surface budding.
Conclusions:
- The new isolates represent a distinct group of murine retroviruses with unique assembly mechanisms.
- The association of type A particles with the mitotic apparatus suggests a potential link between viral replication and host cell division.
- The microtubule system plays a critical role in the intracellular trafficking and release of these novel retroviruses.