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* Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10021;
Beijing Institute of Microbiology and Epidemiology, Beijing, China;
You An Hospital, Capital University of Medical Sciences, Beijing, China; and
Gene Gateway, LLC, Hayward, CA 94545
The spike (S) protein of severe acute respiratory syndrome (SARS) coronavirus (SARS-CoV) is not only responsible for receptor binding and virus fusion, but also a major Ag among the SARS-CoV proteins that induces protective Ab responses. In this study, we showed that the S protein of SARS-CoV is highly immunogenic during infection and immunizations, and contains five linear immunodominant sites (sites I to V) as determined by Pepscan analysis with a set of synthetic peptides overlapping the entire S protein sequence against the convalescent sera from SARS patients and antisera from small animals immunized with inactivated SARS-CoV. Site IV located in the middle region of the S protein (residues 528635) is a major immunodominant epitope. The synthetic peptide S603634, which overlaps the site IV sequence reacted with all the convalescent sera from 42 SARS patient, but none of the 30 serum samples from healthy blood donors, suggesting its potential application as an Ag for developing SARS diagnostics. This study also provides information useful for designing SARS vaccines and understanding the SARS pathogenesis.
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