HIV自然感染与疫苗诱导产生抗体鉴别肽的原核表达及纯化 |
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引用本文: | 袁作为,张君,胡接力,张秀瑜,黄爱龙,郑建.HIV自然感染与疫苗诱导产生抗体鉴别肽的原核表达及纯化[J].粉末涂料与涂装,2011,24(11). |
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作者姓名: | 袁作为 张君 胡接力 张秀瑜 黄爱龙 郑建 |
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作者单位: | 袁作为 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; 张君 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; 胡接力 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; 张秀瑜 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; 黄爱龙 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; 郑建 (重庆医科大学感染性疾病分子生物学教育部重点实验室重庆医科大学附属二院肝病研究所,重庆,400016) ; |
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摘 要: | 目的原核表达并纯化HIV自然感染与疫苗诱导产生抗体鉴别肽sk1、sk2、sk3及3条肽段串联序列。方法用普通PCR及重叠延伸PCR法从HIV-1 B亚型质粒扩增得到sk1、sk2、sk3基因序列及3条肽段基因片段的6种连接序列,并分别克隆入原核表达载体pET-32a(+)及pGEX4T-2中,转化大肠杆菌BL21(DE3),IPTG诱导表达,表达产物经Ni-NAT或谷胱甘肽-Sepharose-4B层析柱亲和层析纯化。SDS-PAGE分析融合肽的表达,Western blot分析融合肽的抗原性。结果分别以pET-32a(+)和pGEX4T-2为载体,共构建了18个重组表达质粒;his-sk1、his-sk123、his-sk213、his-sk231及GST-sk3、GST-sk123、GST-sk213分别在pET-32a(+)及pGEX4T-2表达载体中以可溶形式表达,且均能与HIV-1阳性血清反应,而不能与HIV DNA-天坛疫苗免疫血清反应;经大量诱导表达纯化后,GST-sk3表达量最高,可达40 mg/L,纯度超过90%。结论已成功表达并纯化了具有生物学活性的HIV自然感染与疫苗诱导产生抗体鉴别肽,为研制HIV自然感染与疫苗诱导产生抗体鉴别诊断试剂盒奠定了基础。
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关 键 词: | HIV 自然感染 疫苗 抗体 抗原肽 诊断 鉴别 |
Prokaryotic Expression and Purification of HIV Differential Peptides for Natural Infection-elicited and Vaccine-induced Antibodies |
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Abstract: | Objective To express HIV differential peptides sk1,sk2,sk3 and their concatemers for natural infection-elicited and vaccine-induced antibodies.Methods By routine PCR and overlap extension PCR,sk1,sk2 and sk3 gene sequences as well as six concatemers of them were amplified from whole HIV-1 B genome plasmid,and cloned into prokaryotic expression vectors pET32a(+) and pEGX4T-2 separately.The constructed recombinant plasmids were transformed to E.coli BL21(DE3) and induced with IPTG.The expressed product was purified by Ni-NAT or glutathione-Sepharose-4B affinity chromatography.The expressed fusion peptides were identified by SDS-PAGE and analyzed for antigenicity by Western blot.Results A total of 18 recombinant plasmids were constructed by using pET-32a(+) and pGEX4T-2 as vectors.The his-sk1,his-sk123,his-sk213 and his-sk231 proteins were expressed by using vector pET-32a(+),while GST-sk3,GST-sk123 and GST-sk213 by using pGEX4T-2,both in soluble form.The expressed products showed specific reaction with HIV-1 positive serum while no reaction with immune serum induced by HIV DNA-Tiantan vaccine.After expression and purification in a large quantity,the expression level of GST-sk3 was the highest in all the proteins,which reached 40 mg / L,while the purity was more than 90%.Conclusion The bioactive differential peptides for natural infection-elicited and vaccine-induced antibodies were successfully expressed,which laid a foundation of developing differentially diagnostic kit for antibodies induced by natural infection and by vaccination. |
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Keywords: | HIV Natural infection Vaccine Antibody Antigen peptide Diagnostic differential |
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