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- W3031625311 abstract "Objective Through constructing prokaryotic expression vector pET-30a-GPI-B7-1, to gain purified GPI-B7-1 fusion protein so as to confirm the tumor immune effect. Methods The DNA fragment encoding the signal for GPI-anchor attachment of hPLAP-1 and the cDNA encoding the human costimulatory molecule CD80 ( BT-1 ) were cloned from fresh placenta and human peripheral blood monocytes (PBMC) respectively. The two fragment were annealed to form a fusion gene (GPI-BT-1) by PCR. Then the fusion gene was inserted into the prokaryotic expression vector pET-30a, resulting in pET-30a-GPI-BT-1. Transfer to E. coli BL21, purified fusion protein were analysed by SDS-PAGE and Western blot. Results Agarose gel electrophoresis map of GPI and BT-1 PCR products show that GPI goal gene strap was seen at 133bp region and BT-1 goal gene strap at 792 region. Identification of recombinant pET-30a-GPI-B7-1 by restriction enzyme and PCR illustrate two goal fragment for 5000 bp and 900 bp, to realize the expression of fusion gene ( GPI-B7-1 ) at the E. coli BL21. The fusion protein was successfully produced in the pET expression system induced by IPTG and purified by Ni2 + -NTA agarose column. By SDS-PAGE and Western blot analysis, the observed molecular weight of the fusion protein was 38 kDa. Conclusion The purified GPI-B7-1 fusion protein can be obtained from E. coli BL21 transfered by prokaryotic expression vector pET-30a-GPI-B7-1, which will prove useful tool for the study of tumor immune therapy.Key words: Gene expression; Glycosylphos phatidylinositols" @default.
- W3031625311 created "2020-06-05" @default.
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- W3031625311 date "2009-01-25" @default.
- W3031625311 modified "2023-09-23" @default.
- W3031625311 title "Construction and expression of procaryotic expression vector of a chimeric GPI-B7-1 cDNA" @default.
- W3031625311 doi "https://doi.org/10.3760/cma.j.issn.1007-631x.2009.01.014" @default.
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