脯氨酸氨肽酶枯草芽孢杆菌分泌表达及特性表征
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Secretory Expression and Characterization of Prolyl Aminopeptidase in Bacillus subtilis
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    摘要:

    构建重组枯草芽孢杆菌大量分泌米曲霉脯氨酸氨肽酶,纯化后对其基本酶学性质进行表征。将脯氨酸氨肽酶cDNA序列从载体pMD19-pap上克隆后连接到载体pMA5上得到重组质粒,转化枯草芽孢杆菌WB600后进行分泌表达。通过在培养基中加入5% D-山梨醇和2 mmol/L CaCl2,胞外酶活由7.5 U/mL提高到36 U/mL。通过硫酸铵盐析、Hitrap Q和SuperdexTM 75对重组脯氨酸氨肽酶进行了纯化,纯化后的比酶活为247.3 U/mg,纯化倍数达到8.8倍。该酶最适温度为50 ℃,最适pH为7.5,米氏常数Km和最大反应速率Vmax分别为0.171 mmol/L和55.99 μmol/(L·min)。

    Abstract:

    Construct recombinant Bacillus subtilis to over-expression Aspergillus oryzae prolyl minopeptidase,then purified and characterized its basic enzyme properties. The pap gene was cloned from pMD19-pap vector and ligated into pMA5 to generate recombinant pMA5-pap expression vector. Then the vector was transformed into Bacillus subtilis WB600 competent cells and secretory expressed. By adding 5% D-sorbitol and 2 mmol/L CaCl2 in TB medium,the enzyme activity in fermented supernatant increased from 7.5 to 36.0 U/mL. The recombinant prolyl aminopeptidase was purified by ammonium sulfate,Hitrap Q anion exchange chromatography and SuperdexTM 75 gel chromatography,the purification factor was 8.8 and the specific activity of the purified enzyme was 247.3 U/mg. The purified enzyme has the highest activity at pH 7.5 and 50 ℃,the K m and V max was estimated to be 0.171 mmol/L and 55.99 μmol/(L·min) respectively.

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汪克红,王开道,田亚平.脯氨酸氨肽酶枯草芽孢杆菌分泌表达及特性表征[J].食品与生物技术学报,2018,37(11):1135-1140.

WANG Kehong, WANG Kaidao, TIAN Yaping. Secretory Expression and Characterization of Prolyl Aminopeptidase in Bacillus subtilis [J]. Journal of Food Science and Biotechnology,2018,37(11):1135-1140.

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  • 在线发布日期: 2018-12-25
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