[Prokaryotic expression and identification of human papillomavirus type 16 E7 protein encoding gene].

OBJECTIVE: To construct the prokaryotic expression plasmid pET32/E7 and express the human papillomavirus type 16 E7 protein in E. coli. METHODS: HPV16 E7 gene was amplified by PCR. The amplified E7 fragment was inserted into the plasmid pET32a (+) that was digested with BamH I and Hind III. The recombinant plasmid pET32/E7 was transformed into E. coli JM109 which was selected with ampicillin. The positive clones containing recombinant plasmid pET32/E7 were verified by BamH I and Xho I digestion, and then sequenced. HPV16 E7-TRX recombinant protein expression in the E. coli BL21(ED3) was identified by SDS-PAGE and Western blot. RESULTS: The prokaryotic recombinant plasmid pET32/E7 was successfully constructed. The BL21(DE3) transformed recombinant plasmid pET32/E7 had expressed HPV16 E7-TRX recombinant protein effectively. Under the conditions of 1 mmol/L IPTG and 30 degrees C, the amount of HPV16 E7-TRX recombinant protein was about 30% of bacterial total proteins. CONCLUSION: The construction of the prokaryotic recombinant plasmid pET32/E7 and the successful expression of the recombinant protein HPV16 E7-TRX would strongly promote the research of the biological properties and the transformational mechanism of the HPV16 E7 protein on the specific cells.