内含人前列腺特异性抗原 mRNA 的耐核糖核酸酶病毒样颗粒的构建和表达  

Construction and expression of RNase-resisting virus-like particles containing PSA mRNA

作　　者：王露楠[1] 吴健民[1] 彭建明[2] 李金明[2] 王忠芳[2] 邓巍[2] 

机构地区：[1]华中科技大学同济医学院附属协和医院,武汉430022 [2]卫生部北京医院

出　　处：《中华老年医学杂志》2006年第3期215-218,共4页Chinese Journal of Geriatrics

基　　金：国家自然科学研究基金(30371365);首都医学发展科研基金(2002-3041)

摘　　要：目的构建原核表达系统,表达内含人前列腺特异性抗原(prostate specific antigen,PSA)mRNA 部分序列的病毒样颗粒,该病毒样颗粒因噬菌体蛋白包被重组 RNA 而使其包裹的RNA 具有耐核糖核酸酶(RNase)的特性。方法采用聚合酶链反应扩增人前列腺特异性抗原cDNA 的部分保守区域,进行 TA 克隆后用限制性内切酶 Hind Ⅲ酶切获得所需要的目的片段,与用Hind Ⅲ酶切的表达载体 pNCCL1相连接.构建一新的表达载体 pNCCL1-PSA,再转化 E.Coli BL21-DE3,用 IPTG 诱导表达噬菌体 MS2包膜蛋白,包膜蛋白可进行自我组装成病毒样颗粒并将 PSAmRNA 部分序列包裹到病毒样颗粒内。结果成功构建得到了新的表达载体 pNCCL1-PSA,经原核表达得到耐 RNase 的内含 PSA mRNA 部分 RNA 序列的病毒样颗粒。结论本研究得到的表达载体 pNCCL1-PSA 及原核表达系统.可以作为以后构建和制备耐 RNase 的 PSA mRNA 标准品和质控品的的平台,为实验室 PSA mRNA 的检测提供新的标准品及质控品。Objective To construct an expression system to produce the virus-like particles containing a part of the sequence of PSA mRNA, which are ribonuclease-resistant due to the encapsulation of the mRNA by bacteriophage MS2 coat proteins. Methods The PCR products of PSA cDNA fragments were cloned to TA vector pBS-T, then the targeted segments could be obtained when the pBS-T-PSA were digested by restriction endonuclease Hind Ⅲ and cloned to prokaryocytic expression vector pNCCL1. The recombinant plasmids named PNCCL1 - PSA were transfected into E. Coli BL21-DE3 and induced to express with IPTG. Results The recombinant plasmids were successfully constructed. The bacteriophage MS2 coat protein which expressed in BL21 can self- assemble to form ribonuclease-resistant virus-like particles and the PSA mRNA was encapsulated into virus-like particles. Conclusions The virus-like particle containing PSA mRNA can be expressed in prokaryocyte and it can be used as standard and control in detecting PSA mRNA. It provides a new, stable and ribonuclease-resistant RNA standard in RNA detection.

关 键 词：前列腺特异性抗原 病毒粒子 噬菌体 

分 类 号：R737.25[医药卫生—肿瘤] R373[医药卫生—临床医学]