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ID:15206994
大小:40.00 KB
页数:12页
时间:2018-08-02
《人胰高血糖素样肽-1突变体基因原核表达质粒的构建》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
2、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。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Constructionofexpressionvectoro
3、fhumanGlucagon-like12peptide-1mutantgene[Abstract]Objective:ToobtainthemutantgeneofhumanGlucagon-likepeptide-1(hGLP-1),constructtheexpressionvectorofpGEX-4T/(Val8)hGLP-1,andexpresstheGSTfusionproteininE.colicells.Methods:WiththepreferentialcodonofE.colibeing
4、selected,fouroligonucleotidefragmentsweredirectlybiosynthesized,thenweresplicedtoformacompletemutantgeneofhGLP-1whichchangedthecodonforthesecondaminoacidofhGLP-1(7~37)-alanine(Ala8)intovaline(Val8)bymeansofsite-directedmutagenesis,soitnamed(Val8)hGLP-1.Themu
5、tantgenewasinsertedintothevectorpGEX-4T-1withBamHIandXhoIrestrictionsites.TherecombinantplasmidofpGEX-4T/(Val8)hGLP-1wastransformedintoE.colicells(BL21),thenidentifiedbyelectrophoresisafterenzymedigestionandtestifiedbyDNAsequencing,furtherinducedtoexpressthe
6、fusionproteinbyIPTG.Results:TheresultsofelectrophoreticanalysisandDNAsequencingconfirmedthatthesyntheticmutantgene(Val8)hGLP-1hadbeenclonedintothepGEX-4T-1successfully,andinducedexpressionoffusionproteinbySDS-PAGEanalysis.Conclusion:TheGSTfusionproteinexpres
7、sionplasmidofpGEX-4T/(Val8)hGLP-1wassuccessfully12constructed,whichlaidthefoundationforfurtherobtainingrecombinanthGLP-1mutantforexperimentalorclinicalstudiesandprovidedthetechnicalroutesofindustrialization.[Keywords]HumanGlucagon-likepeptide-1;Fusionprotein
8、;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
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