食品科学 ›› 2021, Vol. 42 ›› Issue (10): 178-183.doi: 10.7506/spkx1002-6630-20200304-062

• 生物工程 • 上一篇    下一篇

草鱼胰蛋白酶的亲和纯化及酶学性质

李晨,高柳芳,崔晓东,韩宇航,朱丹旭,李娇   

  1. (1.山西大学生命科学学院,山西 太原 030006;2.山西大学生物技术研究所,山西 太原 030006)
  • 出版日期:2021-05-25 发布日期:2021-06-02
  • 基金资助:
    山西省回国留学人员科研资助项目(2020-015);山西省研究生教育创新项目(2020SY021); 国家自然科学基金青年科学基金项目(31600631)

Affinity Chromatographic Purification and Enzymatic Characterization of Trypsin from Grass Carp (Ctenopharyngodon idellus)

LI Chen, GAO Liufang, CUI Xiaodong, HAN Yuhang, ZHU Danxu, LI Jiao   

  1. (1. School of Life Science, Shanxi University, Taiyuan 030006, China; 2. Institute of Biochemistry, Shanxi University, Taiyuan 030006, China)
  • Online:2021-05-25 Published:2021-06-02

摘要: 从草鱼肝胰腺中提取胰蛋白酶,经匀浆、硫酸铵分级沉淀、透析得到胰蛋白酶粗酶液,通过BTI-Sepharose亲和层析一步纯化得到电泳纯的草鱼胰蛋白酶,并进一步研究该胰蛋白酶的酶学性质。结果表明:草鱼胰蛋白酶的分子质量约为27 kDa,米氏常数Km为3.4×10-5 mol/L;最适反应温度为60 ℃,在低于60 ℃条件下稳定;最适pH值为9.5,酸碱耐受范围为pH 6.0~12.0;Ba2+、Mg2+、Fe2+在0~10 mmol/L范围内对该酶具有一定激活作用,而乙二胺四乙酸(ethylene diamine tetraacetic acid,EDTA)、K+在0~10 mmol/L范围内对该酶有一定抑制作用,EDTA较K+对酶的抑制作用更明显。

关键词: 草鱼;胰蛋白酶;亲和纯化;酶学性质

Abstract: Trypsin was extracted from the hepatopancreas of grass carps in this study. After homogenization and ammonium sulfate precipitation, crude enzyme solution was prepared by dialysis. Then, trypsin of electrophoretic purity was obtained by BTI-Sepharose affinity chromatography in only one step. The results showed that the molecular mass of the trypsin was about 27 kDa, and the Km was 3.4 × 10-5 mol/L. The optimum reaction temperature of the enzyme was 60 ℃ and it remained stabile at temperatures lower than 60 ℃. Its optimal reaction pH was 9.5, and the pH tolerance range was 6.0–12.0. Ba2+, Mg2+ and Fe2+ all could activate the enzyme in the concentration range of 0–10 mmol/L. EDTA and K+ inhibited the enzyme in the concentration range of 0–10 mmol/L, the former being more effective than the latter.

Key words: grass carp; trypsin; affinity chromatographic purification; enzymatic properties

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