[Secreted expression of dengue virus type I envelope glycoprotein in 293T cells]

Abstract

Objective: To expression prM/E gene of dengue virus type I in mammalia cells.

Methods: The full-length prM/E gene of dengue virus type I strain GZ01/95 was amplified by RT-PCR, the signal peptide preceding the prM gene was added or the carboxyl-terminal 20% of DEN-1 E was replaced with the corresponding JE sequence in the meanwhile, and three of the constructions were cloned into the pcDNA5/FRT.Then they were transfected into 293T cells by lipofectamine respectively. The expression of recombinant proteins were identified by indirect immuno-fluorescence assay(IFA) as well as Western blot.

Results: In the cytoplasm of 293T cells transfected with all the recombinant plasmids DNA, the expressed products for gene of dengue virus type I were confirmed by IFA. The secreted expression products for gene of dengue virus type I specific protein bands were confirmed by Western blot only existing in the cell supernatants transfected with the modified recombinant plasmids DNA.

Conclusion: The prM/E protein of dengue virus type 1 were expressed in 293T cells transfected with all the three recombinant plasmids DNA. The prM/E protein was obtained secretion after transfecting the modified recombinant plasmids adding a signal peptide preceding the prM gene or replacing the carboxyl-terminal 20% of E with the corresponding JE sequence.