摘要
为建立大豆球蛋白免疫检测方法及致敏机理的深入研究提供基础材料,人工合成了大豆球蛋白A1a酸性多肽基因的cDNA序列,通过聚合酶链式反应(PCR)和Bam HI、Kpn I双酶切构建了原核表达载体pET30a-A1a,将重组质粒转化大肠杆菌(E.coli)BL21后用异丙基硫代-β-D-半乳糖苷(IPTG)诱导表达。SDS-PAGE分析表明,A1a酸性多肽融合蛋白能以可溶蛋白形式进行分泌表达,并且诱导5h后,A1a酸性多肽融合蛋白表达量达到最高。经His亲和层析纯化,获得纯度达90%的融合A1a蛋白,分子质量大小约为38kD。Western blotting显示,所获得的A1a融合蛋白能与对豆粕过敏的仔猪血清发生免疫反应,表明所获得融合蛋白具有免疫活性。
The cDNA sequence of full-length A1a acidic peptide from glycinin was synthesized and inserted into the prokaryotic expression vector pET-30a.The A1a fusion protein was expressed in Escherichia coli BL21（DE3） with the induction of IPTG.The highest expression level was observed after IPTG induction for 5 h.The recombinant protein was purified by His-tag affinity chromatography.The purity of Ala fusion protein was 90% and its molecular weight was approximately 38 kD.Western blotting analysis revealed that the recombinant protein had immunological activity because it could react with the serum of soybean meal allergic piglet.These results are helpful to develop an immunoassay for detecting A1a acidic peptide and exploring its mechanisms.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2011年第17期278-282,共5页
Food Science
基金
"十一五"国家科技支撑计划项目(2006BAD12B04-06)
中国农业科学院基本科研业务费专项(2009-2010)
