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禽多杀性巴氏杆菌C481成熟外膜蛋白H基因原核表达最适条件的探索
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曹素芳, 黄青云, 韩先干, 邓宪方
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(华南农业大学 兽医学院, 广东 广州 510642)
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摘要:
应用PCR扩增出禽多杀性巴氏杆菌C481成熟外膜蛋白H基因(ompmH),将ompmH片段按正确的阅读框定向插入原核表达载体pGEX6p1中谷胱甘肽转移酶(GST)基因的下游,获得了重组表达质粒pGEXompmH。然后将重组质粒转化大肠埃希氏菌BL21(DE3),当转化菌的D600nm值达到0.6~0.8时,对异丙基硫代βD半乳糖苷(IPTG)的诱导浓度、诱导时间和诱导温度等条件进行了试验,根据聚丙烯酰胺凝胶电泳判定融合蛋白GSTompmH表达的最适条件。结果,当细菌的D600nm值为0.6~0.8时,IPTG最佳诱导浓度为0.8mmol/L,最佳诱导时间为4h,最适诱导温度为25℃。并用免疫印迹法对表达产物进行检测,结果显示表达的融合蛋白GSTompmH能与C481外膜蛋白免疫血清发生特异性反应,证明pGEX6p1载体表达的融合蛋白保留了天然蛋白的抗原性。 |
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关键词:
禽; 多杀性巴氏杆菌; 成熟外膜蛋白H基因; 聚丙烯酰胺凝胶电泳; 免疫印迹法; 融合蛋白 |
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中图分类号:S 852.61 文献标识码:
A 文章编号:1000-6419(2005)01-0045-04 |
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Study on prokaryotic expression of mature outer membrane protein H gene of C481 |
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CAO Sufang, HUANG Qingyun, HAN Xiangan, DENG
Xianfang |
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(College of Veterinary, South China Agricultural University, Guangzhou 510642, China) |
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Abstract: The mature outer membrane protein(ompmH) gene was amplifiedby PCR. According to the right open reading frame(ORF),the PCR product was cloned into the prokaryotic expression vector pGEX6p1 and obtained the recombinant plasmid pGEXompmH. The fused protein GSTompmH was studied in detail on many factors including IPTG inducing concentration, temperature and time. The expressed product was identified by SDSPAGE. The resltuts showed that the best concentration of IPTG was
0.8mmol/L and the best inducing time was 4h and the best inducing temperature was
25℃.The fusion protein GSTOmpmH could be recognized by antisera of C481 outer membrane protein using Western blotting. It was concluded that the fusion protein
GSTOmpmH possessed good antigenicity. |
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Key words: avian; Pasteurella multocida; ompmH; SDSPAGE; Westernblotting; fusion protein |
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