GST-人可溶性成纤维细胞生长因子受体1融合蛋白在酵母细胞中的表达及活性测定

Expression in yeasts and activity of recombinant GST-hunian soluble fibroblast growth factor receptor 1 fusion protein

目的：表达重组人可溶性成纤维细胞生长因子受体１（ｓｏｌｕｂｌｅ ｆｉｂｒｏｂｌａｓｔ ｇｒｏｗｔｈ ｆａｃｔｏｒ ｒｅｃｅｐｔｏｒ １，ｓＦＧＦＲ１），研究其对成纤维细胞生长因子（ＦＧＦ）生物学活性的拮抗作用。方法：采用逆转录－ＰＣＲ（ＰＴ－ＰＣＲ）技术自人肺成纤维细胞获得ｓＦＧＦＲ１ ｃＤＮＡ，测序确证后，将其克隆人酵母细胞表达载体ｐＹＥＸ４Ｔ－１；重组质粒转化入酵母细胞（ＤＹ１５０）中进行诱导表达，表达产物经ＳＤＳ－ＰＡＧＥ及 Ｗｅｓｔｅｒｎ ｂｌｏｔ鉴定。利用 ＮＩＨ３Ｔ３细胞增殖抑制实验检测重组人 ｓＦＧＦＲ１的生物学活性。结果：经 ＣｕＳＯ４诱导，酵母细胞表达出重组谷胱苷肽转移酶（ＧＳＴ）－ｓＦＧＦＲ１融合蛋白，此蛋白在凝胶上表现为 １条约 ６０ｋＤ的阳性区带，在 Ｗｅｓｔｅｒｎ ｂｌｏｔ实验中可被ＧＳＴ特异性抗体识别。重组ＧＳＴ－ｓＦＧＦＲ１融合蛋白的粗提物在体外能够桔抗ＦＧＦ介导的促ＮＩＨ３Ｔ３细胞增殖的活性。结论：重组ＧＳＴ－ｓＦＧＦＲ１融合蛋白在酵母表达系统中得到有效表达，并具有很好的生物活性。

Objective: To express recombinant human soluble fibroblast growth factor receptor 1 ( sFGFR1) and study its antagonistic activity on FGF. Methods: Human sFGFR1 cDNA, isolated from human lung fibroblast cells with RT-PCR was confirmed by DNA sequencing and cloned into pYEX4T-1 yeast expression vector. The recombinant sFGFR1 was expressed in DY150 yeast cells and the product was identified by SDS-PAGE and Western blot. The activity of recombinant sFGFR1 was detected in N1H3T3 proliferation inhibition assay. Results: GSF-sFGFR1 fusion protein was expressed in yeast cells and was observed as a band of 60 Id) on a SDS- PAGE gel and by Western blot. The recombinant fusion protein was also found to be able to suppress FGF-induced proliferation of NIH3Th cells. Conclusion: Recombinant human GST-sFGFR1 fusion protein was expressed in yeast efficiently and showed natural biological activities.