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枯草芽孢杆菌角蛋白酶kerC基因在毕赤酵母中的高效表达

作  者:
韩学易;唐自钟;王丽华;陈惠
单  位:
四川农业大学生命科学与理学院
关键词:
枯草芽孢杆菌;角蛋白酶;kerC基因;毕赤酵母;高效表达
摘  要:
以角蛋白酶基因为研究对象,构建毕赤酵母(Pichia pastoris)稳定的高效表达系统.采用PCR方法从枯草芽孢杆菌(Bacillus subtilis)B-3中克隆得到角蛋白酶基因kerC,将其构建在毕赤酵母表达载体pPICZαA上,得到重组质粒pPICZαA-kerC,转入毕赤酵母X-33中,成功实现了角蛋白酶基因kerC在真核表达系统中的高效表达.重组菌株以体积分数1%的甲醇诱导培养108h后,酶活力可达32.31U/mL,提高了11.15倍.重组酶最适温度为60℃,最适pH值为7.5,反应体系中3mmol/L的Co2+、Fe2+和Ca2+能明显增强其酶活力.SDS-PAGE检测表明,重组酶分子质量约为31kD.
单  位:
College of Life and Basic Sciences,Sichuan Agricultural University,Ya'an 625014,China
关键词:
Bacillus subtilis%keratinase%kerC gene%Pichia pastoris%overexpression
摘  要:
A stable and highly effective expression system was constructed for the expression of keratinase gene(kerC) in Pichia pastoris.kerC gene was cloned from Bacillus subtilis B-3 by PCR,inserted into the expression vector pPICZαA and transformed into Pichia pastoris X-33.The results showed that the kerC gene was over expressed successfully in the eukaryotic expression system.The maximum keratinase yield of the recombinant strains reached 32.31 U/mL in the culture supernatant grown for 108 h by 1% methanol induction,a 11.15-fold increase in comparison to that obtained with the prokaryotic expression strain BL21-pET-kerC.The optimal temperature and pH of the recombinant keratinase were 60 ℃ and 7.5,respectively.It was strongly stimulated by Co2+,Fe2+ and Ca2+ despite being completely inhibited by Fe3+.The recombinant keratinase with a molecular mass of 31 kD was purified as determined by SDS-PAGE.

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