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ID:10652982
大小:62.81 KB
页数:5页
时间:2018-07-07
《人胰高血糖素样肽 期刊论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、人胰高血糖素样肽-1突变体基因原核表达质粒的构建作者:朱清顾云,陆伟,刘梅【摘要】目的:对人胰高血糖素样肽-1(hGLP-1)进行基因突变,构建GST融合蛋白原核表达质粒pGEX-4T/(Val8)hGLP-1,并在大肠杆菌中诱导表达。方法:选择大肠杆菌偏爱密码子,将hGLP-1(7~37)第2位的丙氨酸(Ala8)定点突变为缬氨酸(Val8)直接生物合成4个寡聚核苷酸片段并进行基因拼接,,形成完整的hGLP-1突变体基因(Val8)hGLP-1,并连接到载体pGEX-4T-1,转化大肠杆菌BL21,BamHI与XhoI双酶切电泳鉴定与序列测定,然后诱导表达其融
2、合蛋白。结果:经酶切电泳鉴定与测序分析,证实所合成的突变体基因(Val8)hGLP-1已克隆到pGEX-4T-1中,经SDS-PAGE分析可以诱导表达出融合蛋白。结论:成功地构建了GST融合蛋白原核表达质粒pGEX-4T/(Val8)hGLP-1,为进一步获得重组hGLP-1蛋白奠定基础,为产业化规模制备hGLP-1突变体提供实验依据。【关键词】人胰高血糖素样肽-1;融合蛋白;基因突变;克隆;糖尿病ConstructionofexpressionvectorofhumanGlucagon-likepeptide-1mutantgeneAbstractObject
3、ive:ToobtainthemutantgeneofhumanGlucagon-likepeptide-1hGLP-1constructtheexpressionvectorofpGEX-4T/(Val8)hGLP-1andexpresstheGSTfusionproteininE.colicells.Methods:WiththepreferentialcodonofE.colibeingselectedfouroligonucleotidefragmentsweredirectlybiosynthesizedthenweresplicedtoformaco
4、mpletemutantgeneofhGLP-1whichchangedthecodonforthesecondaminoacidofhGLP-1737-alanineAla8intovalineVal8bymeansofsite-directedmutagenesissoitnamed(Val8)hGLP-1.ThemutantgenewasinsertedintothevectorpGEX-4T-1withBamHIandXhoIrestrictionsites.TherecombinantplasmidofpGEX-4T/(Val8)hGLP-1wastr
5、ansformedintoE.colicellsBL21thenidentifiedbyelectrophoresisafterenzymedigestionandtestifiedbyDNAsequencingfurtherinducedtoexpressthefusionproteinbyIPTG.Results:TheresultsofelectrophoreticanalysisandDNAsequencingconfirmedthatthesyntheticmutantgeneVal8hGLP-1hadbeenclonedintothepGEX-4T-
6、1successfullyandinducedexpressionoffusionproteinbySDS-PAGEanalysis.Conclusion:TheGSTfusionproteinexpressionplasmidofpGEX-4T/Val8hGLP-1wassuccessfullyconstructed,whichlaidthefoundationforfurtherobtainingrecombinanthGLP-1mutantforexperimentalorclinicalstudiesandprovidedthetechnicalrout
7、esofindustrialization.KeywordsHumanGlucagon-likepeptide-1FusionproteinGenemutationCloningDiabetesmellitus人胰高血糖素样肽-1(humanglucagon-likepeptide-1hGLP-1)是由人胰高血糖素基因编码、并由肠道L细胞分泌的一种肽类激素,它是随着食物在肠道的消化吸收过程而分泌的,其功能由hGLP-1受体hGLP-1R介导,是目前能诱导胰岛素分泌的最强物质之一,还能以同样的强度抑制胰高血糖素的分泌,它促胰岛素分泌的作用具有葡萄糖依赖性,随着葡萄
8、糖浓度降低,其促胰岛素分
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