RESUMEN
Objective To study the antigenicity of RNA polymerase and the relationship between the protein and the SARS-CoV replication. Methods The fragment was amplified by PCR, ligated with the prokaryotic expression vector pET32a+ and transformed into E. coli BL-21 .The expressed fusion protein identified by Western-blot and ELISA was used to detect the anti-SARS CoV IgG in different sera. Results The fusion protein was expressed successfully in E. coli BL-21. Detected by ELISA, the positive percentage of the anti-SARS IgG in the healthy donors, patients, infected animals and the rhesus administrated with the inactivated-virus were 0%, 95%, 100% and 0%, respectively. Conclusion Good antigenicity was shown in the expressed RNA polymerase. It can be used to diagnose the infection and to demonstrate the replication of SARS-CoV virus.