mcpr1基因原核表达载体的构建及其在大肠杆菌中的表达

目的 :构建mcpr1基因原核表达载体 ,表达MCPR1蛋白。 方法 :采用多聚酶链式反应 (PCR)扩增出mcpr1基因的蛋白编码序列 ,克隆到中间载体中 ,再经双酶切 ,亚克隆到表达载体中 ,构建该基因的融合表达载体pGEX 4T mcpr1,在大肠杆菌中用IPTG诱导表达 ,SDS PAGE电泳。 结果 :酶切和测序鉴定 ,表明融合表达载体内插入片段正确 ,在大肠杆菌中诱导后 ,出现一条 3 60 0 0的新蛋白带 ,主要存在于细菌沉淀中 ,占总蛋白的3 9 %。结论 :研究表明mcpr1基因编码的蛋白质能够在原核细胞中表达 ,为进一步深入研究该蛋白质的结构与功能打下基础

Construction of mcpr1 gene vector and expression of mcpr1 in escherichia coli

Objective: To construct mcpr1prokaryoti c expression vector and to express MCPR1 protein.Methods:PCR was used to obtain coding region of mcpr1. Construction of a high-level fusion protein expression vector pGEX-4T-mcpr1 was conducted by inserting the fra gment of coding region of mcpr1into a fusion protein expression vector pGEX -4T-1. Then the recombinant plasmid was transferred into E. colito prepar e the MCPR1/GST fusion protein. DNA sequencing and endonucleases digesting were used to check the coding region. Results:pGEX-4T- mcpr1 wa s constructed successfully and the coding region was inserted into the vector co rrectly. A new protein band of 36 000 was observed by SDS-PAGE analysis after i nduction by IPTG. The 36 000 protein amounted to 39 percent of the total prote in and existed mostly in precipitation of broken bacteria. Conclusion: MCPR1 protein can be expressed in E. coliexpression system and purif ied initially.