摘要
采用RTPCR技术从SARS冠状病毒基因组扩增编码S蛋白的S2基因片段(第2170到2814位碱基),克隆到pMD18T载体并测序。用限制性内切酶消化后,S2基因亚克隆至表达载体pGEX4T2,转化大肠杆菌JM109,筛选鉴定阳性菌落。扩增培养含pGEXS2质粒的JM109大肠杆菌,经IPTG诱导,超声破菌,GSHSepharose亲和层析纯化目的蛋白,Westernblot检测SARS患者血清可以识别纯化的蛋白。用此蛋白免疫NIH小鼠,获得了高滴度抗GSTS2抗体的血清,为进一步研究SARS冠状病毒的亚单位疫苗奠定基础。
To study the immunogenicity of spike protein of SARS coronavirus, an expressional plasmid was constructed encoding partial sequence of SARS Coronavirus spike protein from 2170 bp to 2814bp, named fragment-2(S2). The gene sequence encoding S2 was amplified by RT-PCR from SARS Coronavirus genome RNA, cloned to pMD18-T vector and subcloned to pGEX-4T-2. E.coli JM109 that contained recombinant expression vector pGEX-S2 was amplified and fusion protein expression was induced by 1mmol/L IPTG at 37℃. Protein was extracted and purified by GSH-Sepharose affinity chromatography. After identified by the serum of SARS patient by Western-blot, the purified protein GST-S2 was used to immunize NIH mice three times at two weeks interval, the immunized mice produced high titer anti-GST-S2 polyclonal antibody. It lies a basis for the future study of subunit vaccine of SARS coronavirus.
出处
《中国病毒学》
CAS
CSCD
2005年第3期217-220,共4页
Virologica Sinica
基金
深圳市科委资助项目([2003]74)
关键词
SARS
冠状病毒
S蛋白
亲和层析
多克隆抗体
Severe acute respiratory syndrome(SARS)
Coronavirus
Spike protein
Affinity chromatography
Polyclonal antibody
