食品科学

• 生物工程 • 上一篇    下一篇

利用低温聚合酶链式反应技术提高大豆超氧化物歧化酶活性

张丽媛1,马红丹1,赵邯郸1,徐丹丹1,曲 静2,关淑艳1,*,王丕武2,*   

  1. 1.吉林农业大学生命科学学院,吉林 长春 130118;2.吉林农业大学农学院,吉林 长春 130118
  • 出版日期:2015-03-15 发布日期:2015-03-17

Improved Superoxide Dismutase Activity in Soybean by Low Temperature Polymerase Chain Reaction (PCR)

ZHANG Liyuan1, MA Hongdan1, ZHAO Handan1, XU Dandan1, QU Jing2, GUAN Shuyan1,*, WANG Piwu2,*   

  1. 1. College of Life Sciences, Jilin Agricultural University, Changchun 130118, China;
    2. Faculty of Agronomy, Jilin Agricultural University, Changchun 130118, China
  • Online:2015-03-15 Published:2015-03-17

摘要:

目的:利用低温聚合酶链式反应对大豆超氧化物歧化酶(superoxide dismutase,SOD)的活性进行改良。方法:将6 种在较低退火温度下扩增出的超氧化物歧化酶基因插入到表达载体pREP5N上,构建pPM1、pPM2、pPM3、pPM4、pPM5、pPM6表达载体,转入大肠杆菌后得到工程菌,诱导其在大肠杆菌中进行蛋白表达,并进行酶活力测定,筛选高酶活力菌株。结果:将已克隆的目的基因序列与已知的大豆MnSOD基因序列比对分析,一致性平均为86.57%,氨基酸序列同源性平均为82.58%。对已获得的6 种工程菌进行蛋白质提取,十二烷基硫酸钠-聚丙烯酰胺凝胶电泳结果显示表达产物的分子质量约为26 kD。经1%差异水平分析,改良后的SOD酶活力均有极显著提高,平均比对照菌株的酶活力提高1.95 倍。结论:本实验证明低温聚合酶链式反应是改变酶活性的一种有效方法,为超氧化物歧化酶在生产中的应用提供了技术支持。

关键词: 超氧化物歧化酶基因, 低温聚合酶链式反应, 酶活力

Abstract:

Objective: This study aims at modifying the activity of superoxide dismutase in soybean by low temperature
PCR. Methods: Six amplified superoxide dismutase genes at low annealing temperatures were inserted into the expression
vector pREP5N to construct the new vectors pPM1, pPM2, pPM3, pPM4, pPM5 and pPM6. These expression vectors
were introduced into E. coli for enzyme expression. The enzyme activity was determined for screening strains with high
enzyme activity. Results: The alignment analysis of cloned sequences versus published MnSOD sequences showed that
the consistency was 86.57% on average. The homology of amino acid sequences was 82.58%. The molecular weights
of the proteins extracted from six strains were approximately 26 kD as determined by SDS-PAGE. Enzyme activity was
significantly improved (P < 0.01) by 1.95 folds on average. Conclusion: The findings of this study provide technical support
for the application of superoxide dismutase.

Key words: superoxide dismutase gene, low temperature polymerase chain reaction, enzyme activity

中图分类号: