摘要
目的 :从海马组织提取中国人神经生长因子基因 (NGFβ) ,分析中国人NGFβ序列 ,再克隆成熟肽部分 ,使NGFβ在大肠杆菌中表达。 方法 :提取组织总RNA进行逆转录 ,克隆到PCRⅡ载体 ,得 6 5 0bpDNA片段 ,以PCRⅡ /NGFβ载体为模板 ,扩增C端成熟肽部分 ,并克隆到PG5中 ,转化大肠杆菌BL2 1用异丙基 - β -D -半乳糖苷(IPTG)诱导培养。表达产物提纯、复性后 ,进行活性测定。结果 :NGFβcDNA全序列为 10 4 7bp ,所克隆的蛋白编码部分为 6 36bp ,由 2 12个氨基酸组成 ,序列分析结果与Genebank完全一致 ,成熟肽部分表达后 ,经SDS -PAGE电泳在 14kD左右有 1条明显的新增蛋白带 ,与预期的分子量相符 ,并Western印迹证实 ,rNGF约占菌体蛋白 10 %左右。结论 :通过序列分析证实 ,重组NGFβ在大肠杆菌中获得较高水平的表达 。
AIM: To obtain nerve growth factor subunit β(NGF β) gene from Chinese fetal hippocampus tissue, prove its sequence, clone the mature peptide sequence, and make it express in E.coli .METHODS: Total RNA was extracted, amplified by RT-PCR method. Its 650 bp DNA sequence was inserted into PCR Ⅱ vector. PCR/NGF β vector was used as the template to amplfy the C-terminate mature peptide sequence, then subcloned it into PG5 vector. The recombinant was transferred into E.coli BL21. BL21 was cultured and induced by IPTG. The activity of the expressed product was measured after purified and refolded.RESULTS: A complete cDNA sequence was determined as 1 047 nucleotides. The cloned 636 bp encoding 212 amino acids was proved homological to Genbank by sequence analysis. The expressed mature peptide showed an clear band of the prospected 14 kD by SDS-PAGE electrophoresis, and was testified by Western blot. The expression level was about 10% of the total cell lysate. CONCLUSION: The chinese NGF β gene was homological to the foreigners'. The recombinant NGF β was efficiently expressed in E.Coli and the recombinant protein has high immunological activities.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2002年第5期486-489,共4页
Chinese Journal of Pathophysiology
基金
宁波市自然科学基金资助项目 (No .982 8)
