信号肽对耐热β-半乳糖苷酶在枯草芽孢杆菌中表达的影响
首发时间:2010-09-27
摘要:本文以来源于嗜热脂肪芽胞杆菌(Bacillus stearothermophilus)的耐热β-半乳糖苷酶基因bgaB为目标基因,构建了三种分泌表达载体,研究了不同信号肽对耐热β-半乳糖苷酶表达的影响。将耐热β-半乳糖苷酶基因bgaB克隆到分泌表达载体pMALipB-lipA和pMAWprA-lipA的EcoRI和BamHI位点,以替换掉原来的lipA基因,从而获得分泌表达载体pMALipB-bgaB和pMAWprA-bgaB;再将NprE信号肽克隆到pMALipB-bgaB中,以替换掉LipB信号肽,得到另一分泌表达载体pMANprE-bgaB。构建的三种BgaB分泌表达载体转入枯草芽孢杆菌WB600中,分别得到重组菌株WB600(pMALipB-bgaB),WB600(pMAWprA-bgaB)和WB600(pMANprE-bgaB)。实验结果显示,各重组菌耐热β-半乳糖苷酶表达差异非常显著,其中WB600(pMANprE-bgaB)有较高的表达,酶活可达0.40 U/ml,WB600(pMAWprA-bgaB)表达较低,最高酶活仅0.04U/ml,而WB600(pMALipB-bgaB)无法检测到乳糖酶活性。信号肽对BgaB的表达存在较大的影响,有些情况会致使表达失败。
For information in English, please click here
Effect of Different Signal Peptides on the Expression of the Thermostable β-galactosidase in Bacillus Subtilis
Abstract:In this study, we constructed three expression-secretion vectors for Bacillus subtilis in which the thermostable β-galactosidase bgaB gene origining from Bacillus stearothermophilus was used as the target gene. The effect of signal peptides on the expression level of β-galactosidase was evaluated .The bgaB gene was cloned into pMAlipB-lipA and pMAWprA-lipA between EcoRI and BamHI. The lipA gene was replaced by bgaB. Two expression-secretion vectors pMALipB-bgaB and pMAWprA-bgaB were succefully constructed. We also cloned the NprE signal peptides into pMAlipB-bgaB to replace the LipB signal peptide, another expression-secretion vector pMANprE-bgaB was constructed. Finally, these three vectors were transformed into Bacillus subtilis WB600, getting three recombinants WB600(pMALipB-bgaB), WB600(pMAWprA-bgaB) and WB600(pMANprE-bgaB). The level of expression of BgaB was quite different in the three recombinants: WB600(pMANprE-bgaB) expressed β-galactosidase at a highest level among these recombinants, reaching 0.40U/ml; WB600(pMAWprA-bgaB) expressed BgaB with a low activity, only 0.04U/ml; however, the expression of BgaB in WB600(pMAWprA-bgaB) was not detected . These phenomenon indicated that signal peptides have a great influence on the expression of BgaB, even fail to express BgaB.
Keywords: thermostable β-galactosidase signal peptide Bacillus subtilis expression
基金:
论文图表:
引用
No.4386267538878128****
同行评议
共计0人参与
勘误表
信号肽对耐热β-半乳糖苷酶在枯草芽孢杆菌中表达的影响
评论
全部评论0/1000