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Morphology of the nucleoprotein component of rabies virus
Abstract:
The intracytoplasmic ground substance, or matrix, associated with the development of rabies virus and the nucleocapsid of the virus were investigated. The filaments of the matrix were identified as virus-specific by means of ferritin-labeled antibodies. In thin sections, the diameter was 15 nm and the strands seemed to be incorporated into virions during morphogenesis of the virus. The nucleocapsid was isolated from purified virus preparations and was studied in negative contrast. The rabies nucleocapsid appeared as a single-stranded helix with a diameter of 16 nm and a periodicity of 7.5 nm; its length was in excess of 1 mum.
Insights
Researchers investigated the rabies virus matrix and nucleocapsid. Virus-specific matrix filaments, 15 nm in diameter, integrate into virions. The helical nucleocapsid is 16 nm wide and over 1 micrometer long.
Area of Science:
- Virology
- Cell Biology
Background:
- The intracytoplasmic matrix is crucial for rabies virus development.
- Understanding viral components aids in developing antiviral strategies.
Purpose of the Study:
- To investigate the structure and origin of the intracytoplasmic matrix associated with rabies virus.
- To characterize the rabies virus nucleocapsid.
Main Methods:
- Immunoelectron microscopy using ferritin-labeled antibodies to identify virus-specific matrix filaments.
- Negative staining and electron microscopy to study the isolated nucleocapsid structure.
Main Results:
- Matrix filaments, 15 nm in diameter, were identified as virus-specific and incorporated into virions during morphogenesis.
- The rabies nucleocapsid was isolated and characterized as a single-stranded helix (16 nm diameter, 7.5 nm periodicity, >1 µm length).
Conclusions:
- The intracytoplasmic matrix is a virus-specific component essential for rabies virus assembly.
- Detailed structural information of the rabies nucleocapsid provides insights into its replication mechanism.