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Updated: Aug 11, 2026
Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly
Published on: March 1, 2012
Spiroplasmavirus citri 3: propagation, purification, proteins, and nucleic acid
Abstract:
SVC3 is a short-tailed polyhedral virus particle morphologically detectable in many spiroplasmas. It was isolated from two different spiroplasmas (Spiroplasma citri and the suckling mouse cataract agent) by infecting lawns and broth culture of another strain of Spiroplasmavirus citri. Virions from either donor strain had a buoyant density of 1.26 grams per cubic centimeter (metrizamide) or 1.45 grams per cubic centimeter (cesium chloride), and contained five proteins and linear double-stranded DNA with a molecular weight of 14 X 10(6). Other spiroplasmaviruses have not been propagated, and the molecular weights of double-stranded DNA from other mycoplasma (Acholeplasma) viruses are unknown.
Insights
SVC3, a virus infecting spiroplasmas, was isolated and characterized. This study details its structure, DNA, and proteins, providing foundational knowledge for spiroplasma virus research.
Area of Science:
- Microbiology
- Virology
- Molecular Biology
Background:
- Spiroplasmas are wall-less bacteria that can harbor viruses.
- Spiroplasma viruses (SVs) are important for understanding bacterial virus evolution.
- SVC3 is a morphologically detectable virus in many spiroplasmas.
Purpose of the Study:
- To isolate and characterize the SVC3 virus.
- To determine the physical and biochemical properties of SVC3.
- To compare SVC3 with other known spiroplasma viruses.
Main Methods:
- Isolation of SVC3 by infecting Spiroplasma citri and suckling mouse cataract agent lawns and broth cultures.
- Determination of virion buoyant density using metrizamide and cesium chloride gradients.
- Analysis of viral proteins and DNA using SDS-PAGE and molecular weight estimation.
Main Results:
- SVC3 was successfully isolated from two different spiroplasma strains.
- Virions exhibited buoyant densities of 1.26 g/cm³ (metrizamide) and 1.45 g/cm³ (cesium chloride).
- SVC3 contains five proteins and linear double-stranded DNA with a molecular weight of 14 x 10^6 Da.
Conclusions:
- SVC3 is a well-defined spiroplasma virus with specific physical and biochemical characteristics.
- The characterization of SVC3 provides a basis for further research into spiroplasma virus diversity and function.
- This study contributes to the understanding of mycoplasma virus genomics and protein composition.
