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Subunit interaction in B19 parvovirus empty capsids
S J Rosenfeld1, N S Young, D Alling
1Cellular Hematology Branch, National Heart, Lung and Blood Institute, Bethesda, Maryland.
Archives of Virology
|January 1, 1994
Summary
The addition of VP1 protein to B19 parvovirus capsids significantly enhances their antigenicity and neutralizing antibody response. This suggests VP1 is crucial for the virus
Area of Science:
- Virology
- Immunology
- Structural Biology
Background:
- B19 parvovirus has a genome encoding two structural proteins, VP1 and VP2, which form the viral capsid.
- Capsids are composed of approximately 95% VP2 and 5% VP1.
Purpose of the Study:
- To investigate the impact of VP1 on B19 parvovirus capsid antigenicity and antibody response.
- To map fine structure epitopes and understand VP1's role in capsid conformation.
Main Methods:
- Recombinant empty capsids (VP2 alone, VP1/VP2) were constructed and characterized.
- Fine structure epitope mapping was performed using antisera and overlapping peptides.
- Antigenic differences between capsids with and without VP1 were analyzed.
Main Results:
- Empty capsids with VP1 elicited a strong neutralizing antibody response, while VP2-only capsids showed weak activity.
- Epitope mapping revealed four distinct regions correlating with viral structures.
- VP1 significantly altered the antigenicity of the entire capsid, particularly in a region homologous to canine parvovirus spike protein.
Conclusions:
- The unique region of VP1 is essential for B19 parvovirus' mature capsid conformation.
- VP1 addition critically influences capsid antigenicity and immune response.
- Findings support a model where VP1 dictates mature capsid structure and antigenicity.