食品科学

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基因工程菌Escherichia coli BL21/pET-pel重组果胶酶的纯化及酶学性质

徐 伟,姚晓静,付大伟   

  1. 哈尔滨商业大学食品工程学院,食品科学与工程重点实验室,黑龙江 哈尔滨 150076
  • 发布日期:2014-12-15

Purification and Characterization of Recombinant Pectinase from Genetically Engineering Strain Escherichia coli BL21/pET-pel

XU Wei, YAO Xiao-jing, FU Da-wei   

  1. Key Laboratory of Food Science and Engineering, School of Food Engineering, Harbin University of Commerce,Harbin 150076, China
  • Published:2014-12-15

摘要:

采用超声波破碎法、镍离子亲合层析柱法,纯化重组菌Escherichia coli BL21/pET-pel表达的胞内重组果胶酶,并用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(sodium dodecyl sulfate-polyacrylamide pelelectrophoresis,SDSPAGE)检测,研究纯化的重组果胶酶酶学性质。结果表明:重组果胶酶纯化倍数为1.71,回收率为88.5%,分子质量约为44 kD。最适pH值为9.0~9.5,在pH 7.0~10.0之间催化性质较稳定;最适作用温度范围为45~55 ℃,在60 ℃下保温30 min还剩余40%的酶活力;在离子浓度为1 mmol/L时,Ca2+和Co2+对该酶有较强的促进作用,而Fe2+则对其有较强的抑制作用。

关键词: 重组果胶酶, 胞内酶, 镍离子亲合层析, 酶学性质

Abstract:

The recombinant pectinase expressed in Escherichia coli BL21/pET-pel was purified by ultrasonic cell disruption
and nickel ion affinity chromatography, and detected using SDS-PAGE. Its enzymatic characteristics were analyzed. The
results showed that purification fold of the recombinant pectinase was 1.71, and recovery was 88.5%. Molecular weight
of the recombinant pectinase was approximately 44 kD. Its optimal temperature and pH were 45–55 ℃ and 9.0–9.5. It
was stable at pH 7.0–10.0. When the recombinant pectinase was incubated for 30 min at 60 ℃, the relative activity was
approximately 40%. Different metal ions revealed different effects on the recombinant pectinase, which was activated by
Ca2+ and Co2+ but inhibited by Fe2+.

Key words: recombinant pectinase, intracellular enzyme, nickel ion affinity chromatography, enzymatic characteristic

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