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重组人脑钠素在大肠杆菌中的表达、纯化与鉴定 被引量:4

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摘要 人脑钠素(hBNP,human brain natriuretic peptide)是心室分泌的由32个氨基酸组成的多肽激素.临床研究表明,hBNP是治疗充血型心衰竭的一种安全有效的多肽药物.化学合成脑钠素全基因,以pET32a为表达载体,构建了硫氧还蛋白-脑钠素(thioredoxin—hBNP)融合蛋白表达质粒,并转化至大肠杆菌BL21(DE3),经IPTG诱导,融合蛋白的表达量占全菌蛋白量的25%以上.融合蛋白经肠激酶裂解、Zn—Sepharose亲和层析和C4反相高效液相层析,从每升培养液中可获取4mg rhBNP,纯度达到95%.经质谱测定,rhBNP样品的分子量为3464Da.体外活性测定结果表明,rhBNP样品对兔胸主动脉条具有显著的血管舒张效应,其ED50为(2.24±0.58)×10^-6mg/mL.
出处 《南京大学学报(自然科学版)》 CSCD 北大核心 2004年第1期34-40,共7页 Journal of Nanjing University(Natural Science)
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