In order to investigate the enzymatic properties of the 4CL1 of Populus tomentosa, the recombinant expression vector pQE31-4CL 1 was constructed. The recombinant was identified by three restriction endonucleases, then...In order to investigate the enzymatic properties of the 4CL1 of Populus tomentosa, the recombinant expression vector pQE31-4CL 1 was constructed. The recombinant was identified by three restriction endonucleases, then the vector pQE31-4CL 1 was transformed into expression host M15 （pREP4） and induced by isopropyl-a-D-thiogalactoside （IPTG） to express 60 kD fused protein Pt4CL1. The biologically active Pt4CL1, expressed as soluble protein, was achieved with 0.6 mmol＇L-1 IPTG induction as the expression temperature declined from 37 to 28℃. The 6-His tag facilitates affinity binding to Ni^2＋-nitrolotriacetic acid （NTA） and enables one-step purification to acquire the molecular SDS-PAGE electrophoresis purity of the active 4CL1 protein by agarose coupled with Ni^2＋-NTA affinity chromatography. The optimal substrate for Pt4CL 1 was 4-coumarate.展开更多
目的:对珊瑚菜(Glehnia littoralis)4-香豆酸:辅酸A连接酶(4-Coumarate:Coenzyme A Ligase,Gl4CL)基因编码区进行克隆及序列分析。方法:本研究在前期珊瑚菜高通量测序的基础上,利用c DNA末端快速扩增(Rapid Amplification of c DNA Ends...目的:对珊瑚菜(Glehnia littoralis)4-香豆酸:辅酸A连接酶(4-Coumarate:Coenzyme A Ligase,Gl4CL)基因编码区进行克隆及序列分析。方法:本研究在前期珊瑚菜高通量测序的基础上,利用c DNA末端快速扩增(Rapid Amplification of c DNA Ends,RACE)方法对Gl4CL基因全长c DNA序列进行克隆。对Gl4CL蛋白进行理化性质、蛋白二级结构及三维结构预测分析。利用实时荧光定量PCR方法检测Gl4CL基因在珊瑚菜的根、叶中的表达情况。结果:Gl4CL基因cDNA序列全长1 951 bp,编码544个氨基酸,其中开放阅读框1 635 bp,5′非编码区153 bp,3′非编码区163 bp。生物信息学分析表明,Gl4CL蛋白大小约为59.481 k Da,等电点为8.20。Gl4CL基因在珊瑚菜的根和叶均存在表达,且在根中表达量显著高于叶。结论:本研究为进一步开展Gl4CL基因功能和遗传调控研究奠定基础,通过深入探讨Gl4CL基因的表达调控与木质素、植株生长表型等关系,有望获得抗病虫害、抗逆性强的北沙参高产优质品系。展开更多
文摘In order to investigate the enzymatic properties of the 4CL1 of Populus tomentosa, the recombinant expression vector pQE31-4CL 1 was constructed. The recombinant was identified by three restriction endonucleases, then the vector pQE31-4CL 1 was transformed into expression host M15 （pREP4） and induced by isopropyl-a-D-thiogalactoside （IPTG） to express 60 kD fused protein Pt4CL1. The biologically active Pt4CL1, expressed as soluble protein, was achieved with 0.6 mmol＇L-1 IPTG induction as the expression temperature declined from 37 to 28℃. The 6-His tag facilitates affinity binding to Ni^2＋-nitrolotriacetic acid （NTA） and enables one-step purification to acquire the molecular SDS-PAGE electrophoresis purity of the active 4CL1 protein by agarose coupled with Ni^2＋-NTA affinity chromatography. The optimal substrate for Pt4CL 1 was 4-coumarate.
文摘目的:对珊瑚菜(Glehnia littoralis)4-香豆酸:辅酸A连接酶(4-Coumarate:Coenzyme A Ligase,Gl4CL)基因编码区进行克隆及序列分析。方法:本研究在前期珊瑚菜高通量测序的基础上,利用c DNA末端快速扩增(Rapid Amplification of c DNA Ends,RACE)方法对Gl4CL基因全长c DNA序列进行克隆。对Gl4CL蛋白进行理化性质、蛋白二级结构及三维结构预测分析。利用实时荧光定量PCR方法检测Gl4CL基因在珊瑚菜的根、叶中的表达情况。结果:Gl4CL基因cDNA序列全长1 951 bp,编码544个氨基酸,其中开放阅读框1 635 bp,5′非编码区153 bp,3′非编码区163 bp。生物信息学分析表明,Gl4CL蛋白大小约为59.481 k Da,等电点为8.20。Gl4CL基因在珊瑚菜的根和叶均存在表达,且在根中表达量显著高于叶。结论:本研究为进一步开展Gl4CL基因功能和遗传调控研究奠定基础,通过深入探讨Gl4CL基因的表达调控与木质素、植株生长表型等关系,有望获得抗病虫害、抗逆性强的北沙参高产优质品系。
