Objective To construct GST/HIF1α fusion protein expression vector and induce its expression in Escherichia coli (E.coli). Methods The coding sequence of hypoxia inducible factor-la (HIF-la) and its deletion fragments were amplified from the plasmid pcD-NA3.1-HIF-la by PCR and inserted into pGEX-4T-2 by BamHI and Not I. The positive recombinanls were identified by restriction endonu-clease digestion and DNA sequencing. Then they were transformed into E.coli BL21, induced by IPTG and identified by SDS-PAGE and Western blot. Results The prokaryotic expression plasmid pGEX-4T-2-HIF-lα and its deletion mutants were successfully constructed and confirmed by enzyme digestion and sequencing. The desired CST/HIF-1α fusion proteins were expressed and confirmed by Western blot. Conclusion The prokaryotic expression plasmid of HIF-la and its deletion mutants were successfully constructed and the expression of fu-sion proteins was confirmed. This study provides the basis for the further research on purifying HIF-la protein and the biological function of HIF-lα.%目的 构建GST/HIF-1α融合蛋白表达载体,并在大肠埃希菌(E.coli)中诱导表达.方法 以质粒pcDNA3.1-HIF-1α为模板,用PCR法扩增HIF-1α全长及各个截短片段,通过BamHI和Not I酶切位点将HIF-1α全长及各个截短突变体定向插入pGEx-4T-2中,构建原核表达质粒pGEX-4T-2-HIF-1α及其截短突变体,并转化E.coli DH5α,筛选阳性重组子,限制性内切酶酶切鉴定和DNA序列测定正确后,转入E.coli BL21中,异丙基硫代β-D半乳糖苷诱导表达,SDS-PAGE和Western blot鉴定.结果 酶切及测序结果证明,成功构建了原核表达质粒pGEX-4T-2-HIF-1α及其截短突变体,并用Western blot方法证实了GST/HIF-1α全长及各个截短突变体融合蛋白的表达.结论 成功构建了HIF-1α原核表达载体及其截短突变体,并证实了融合蛋白的表达,为进一步纯化HIF-1α蛋白和研究HIF-1α的生物学功能奠定了基础.
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