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The epitope study on the SARS-CoV nucleocapsid protein
Shuting Li1, Liang Lin, Hao Wang
1Beijing Genomics Institute, Chinese Academy of Sciences, Beijing 101300, China.
Genomics, Proteomics & Bioinformatics
|January 5, 2005
Summary
The nucleocapsid (N) protein of SARS-CoV is antigenic. Researchers identified a key antigenic epitope site within the N protein, crucial for developing effective SARS diagnostics.
Area of Science:
- Virology
- Immunology
- Biochemistry
Background:
- The nucleocapsid (N) protein is a known antigen in various coronaviruses.
- The antigenicity of the SARS-CoV N protein required further investigation.
Purpose of the Study:
- To determine if the SARS-CoV N protein is antigenic.
- To identify specific antigenic epitope sites within the SARS-CoV N protein.
Main Methods:
- Western blot and Enzyme-linked Immunosorbent Assay (ELISA) were used to screen sera from SARS patients against recombinant N proteins and synthesized peptides.
- Competition experiments were conducted to map epitope sites.
Main Results:
- All tested SARS patient sera showed strong immunoreactivity against recombinant N proteins, confirming antigenicity.
- A highly antigenic epitope site was identified at the C-terminus, specifically the amino acid sequence from Codons 371 to 407.
Conclusions:
- The nucleocapsid protein of SARS-CoV is confirmed as antigenic.
- Identification of the C-terminal epitope site provides a significant target for developing diagnostic tools for SARS.