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ID:16392188
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时间:2018-08-09
《人胰高血糖素样肽-1突变体基因原核表达质粒的构建.doc》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,然后诱导表达其融合蛋白。
2、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-1mutantgene[Abstract]Objective:To
3、obtainthemutantgeneofhumanGlucagon-likepeptide-1(hGLP-1),constructtheexpressionvectorofpGEX-4T/(Val8)hGLP-1,andexpresstheGSTfusionproteininE.colicells.Methods:WiththepreferentialcodonofE.colibeingselected,fouroligonucleotidefragmentsweredirectlybiosynthesized,thenweresplicedtoformacomple
4、temutantgeneofhGLP-1whichchangedthecodonforthesecondaminoacidofhGLP-1(7~37)-alanine(Ala8)intovaline(Val8)bymeansofsite-directedmutagenesis,soitnamed(Val8)hGLP-1.ThemutantgenewasinsertedintothevectorpGEX-4T-1withBamHIandXhoIrestrictionsites.TherecombinantplasmidofpGEX-4T/(Val8)hGLP-1wastr
5、ansformedintoE.colicells(BL21),thenidentifiedbyelectrophoresisafterenzymedigestionandtestifiedbyDNAsequencing,furtherinducedtoexpressthefusionproteinbyIPTG.Results:TheresultsofelectrophoreticanalysisandDNAsequencingconfirmedthatthesyntheticmutantgene(Val8)hGLP-1hadbeenclonedintothepGEX-4
6、T-1successfully,andinducedexpressionoffusionproteinbySDS-PAGEanalysis.Conclusion:TheGSTfusionproteinexpressionplasmidofpGEX-4T/(Val8)hGLP-1wassuccessfullyconstructed,whichlaidthefoundationforfurtherobtainingrecombinanthGLP-1mutantforexperimentalorclinicalstudiesandprovidedthe6technicalro
7、utesofindustrialization.[Keywords]HumanGlucagon-likepeptide-1;Fusionprotein;Genemutation;Cloning;Diabetesmellitus人胰高血糖素样肽-1(humanglucagon-likepeptide-1,hGLP-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,
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