[The expression of fusion protein GST-GP302 in E.coli and its preparation of rabbit anti-serum].

Aim: To express fusion protein of GST and vWf binding domain(GP302) of platelet GPIbalpha in E.coli and its preparation of rabbit anti-serum.

Methods: GP302 gene was inserted into pGEX-4T-1. The recombinant vector was identificated by restriction endonuclease digestion analysis. Fusion protein GST-GP302 was expressed in E.coli via IPTG induction. The rabbit antibody against GST-GP302 was prepared by using renatured GST-GP302 as immuneogen and the specificity of polyclonal antibody was identified by Western blot.

Results: The restriction endonuclease digestion analysis of recombinant plasmid demonstrated that the GP302 gene had been exactly inserted into pGEX-4T-1. SDS-PAGE analysis showed that the ralative molecular mass(M(r)) of the fusion protein was about 59 000. ELISA analysis proved that the titer of rabbit serum against GST-GP302 was 10(-5). The polyclonal antibody specifically bound to purified platelet GPIbalpha.

Conclusion: The preparation of polyclonal antibody against GP302 peptide provides an usefal reagent for the detection of platelet GPIbalpha.