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断裂内含肽介导的蛋白纯化系统的构建
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Construction of A Protein Purification System Mediated by Split Intein
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DOI:10.3969/j.issn.1673-1689.2019.10.019
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中文关键词: 断裂内含肽 自我断裂 亲和层析介质 空间位阻 克隆表达 蛋白纯化
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英文关键词: split intein,self-cleavage,affinity chromatography medium,steric hindrance,cloning and expression,protein purification
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基金项目:
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摘要点击次数: 22
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全文下载次数: 25
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中文摘要:
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以Npu DnaE(Nostoc punctiforme)内含肽为研究对象,使用分子生物学方法对内含肽的N端结构(IN)和C端结构(IC)进行改造,构建了以IN为亲和配基的亲和层析介质和以IC为自断裂亲和标签的融合蛋白表达体系,形成了由断裂内含肽介导的新型蛋白纯化系统。通过构建3种I2+抑制试验,找到了最佳的断裂组合以及新的Zn2+结合位点。利用N3亲和配基片段C末端的Cys,制备了IN亲和层析介质并对其纯化效果进行了研究,成功获得高纯度GFP蛋白。
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英文摘要:
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Molecular biology techniques are used to modify the N(IN) and C(IC) fragment of Npu DnaE(Nostoc punctiforme) intein. An affinity chromatography medium with INas the affinity ligand and a fusion protein expression system with IC as self-cleavage affinity tag were constructed. Finally,a protein purification system mediated by split intein was developed. The effect of steric hindrance on the C-terminal cleavage rate of fusion protein was studied by constructing 3 kinds of IN affinity ligands and 2 kinds of IC-GFP fusion proteins. Through the combination of in vitro cleavage and Zn2+inhibition experiment,we found the best combination of F and the new Znbinding site. The INaffinity chromatography media were successfully prepared by using cysteine at the C-terminal of N3 affinity ligands. The purification effect of it was studied,and the high purity GFP protein was obtained successfully.
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