摘要
利用带有P43启动子的表达分泌载体pWB980,实现了简单节杆菌3-甾酮-1-脱氢酶在枯草芽孢杆菌中的表达,表达出的目的蛋白的分子量为55kDa。利用分光光度法检测得到胞内和胞外可溶性部分的酶活分别为每毫克蛋白110±0.5mU和15±0.6mU,比出发菌株简单节杆菌提高了将近30倍。重组芽孢杆菌对甾体底物4-AD(4-烯-雄甾-3,17-双酮)的转化率为45.3%,比出发菌株简单节杆菌提高了近10倍。利用枯草芽孢杆菌对甾体底物进行脱氢为甾体药物的生产开辟了一个新的途径。
To improve 3-ketosteroid-Δ^1-dehydrogenase （KSDH） activity and the transformation level for androst-4-ene-3,17-dione, 3-ketosteroid-Δ^1-dehydrogenase gene （ksdD） from Arthrobacter simplex was cloned into plasmid pWB980 and expressed in B. subtilis WB600 under the control of promoter P43. The molecular weight of expressed enzyme was about 55kDa by SDS-PAGE analysis. The activitities assayed by spectrophotometrical method of intracellular and extracellular soluble enzyme were 110 ± 0.5mU and 15 ± 0.6mU per milligram of protein respectively. The transformation rate of androst-4-ene-3,17-dione by the B. subtilis recombinant cells was 45.3%. Compared with Arthrobacter simplex, the enzyme activity of KSDH expressed in B. subtilis was improved about 30 fold, and the transformation level of androst-4-ene-3,17-dione by the B. subtilis recombinant cells was improved about 10 fold. The recombinant B. subtilis cells used in biotransformation of steroids provided a new way for steroid medicines production.
出处
《中国生物工程杂志》
CAS
CSCD
北大核心
2006年第11期24-28,共5页
China Biotechnology
