[Fusion expression of gastric cancer-related gene MPS-1 and preparation of rabbit antibody against GST-MPS-1].

AIM: To express the fusion protein GST-MPS-1 in E.coli and prepare rabbit antibody against GST-MPS-1. METHODS: MPS-1 cDNA was inserted into the vector of pGEX-5X. The recombinant was then transformed into E.coli BL21. After induction with the IPTG, the fusion protein GST-MPS-1 was expressed in E.coli. The purified fusion protein was then used to immunize the New Zealand rabbits to obtain the polyclonal antibody against GST-MPS-1. Specificity of the antibody was tested by Western blot and immunofluorescent staining. RESULTS: The cDNA sequence of MPS-1 in the recombinant was confirmed by restriction endonuclease digestion and sequence analysis. SDS-PAGE result showed that fusion protein was highly expressed in E.coli with a molecular weight of 36 kDa. The titer of the rabbit serum against GST-MPS-1 was as high as 1x10(5) in ELISA analysis. The polyclonal antibody were found to specifically bind to MPS-1 protein in Western blot and immunofluorescent staining. CONCLUSION: The preparation of the polyclonal antibody against MPS-1 lay a foundation for the further study of MPS-1 expression at protein levels and its function.