食品科学 ›› 2011, Vol. 32 ›› Issue (11): 239-242.doi: 10.7506/spkx1002-6630-201111049

• 生物工程 • 上一篇    下一篇

Enterococcus faecalis RQ15产低温中性蛋白酶的纯化及酶学性质

朱巍巍,李 杨,朱万琴,王艳华,冀宝赢,孙翠焕*   

  1. 辽宁省微生物科学研究院
  • 出版日期:2011-06-15 发布日期:2011-05-13

Purification and Characterization of Cold-adapted Neutral Protease from Enterococcus faecalis RQ15

ZHU Wei-wei,LI Yang,ZHU Wan-qin,WANG Yan-hua,JI Bao-ying,SUN Cui-huan*   

  1. Liaoning Scientific Academy of Microbiology, Chaoyang 122000, China
  • Online:2011-06-15 Published:2011-05-13

摘要: 采用DEAE Sepharose Fast Flow和SuperdexTM 75对Enterococcus faecalis RQ15产蛋白酶进行纯化和酶学性质研究。SDS-PAGE测定该蛋白酶分子质量为32.4kD,最适作用温度35~40℃,最适pH7.5。20~40℃之间酶活较高,pH值耐受范围广泛,具有低温蛋白酶的特征。Zn2+对蛋白酶有激活作用,Ag+、Hg2+和EDTA-Na2对酶有显著抑制作用。纯酶最适作用条件下对酪蛋白底物的Km和Vmax分别为1.31×10-4mol/L和6.92×10-6mol/(L ·s)。

关键词: Enterococcus faecalis, 低温蛋白酶, 纯化

Abstract: The protease from Enterococcus faecalis RQ15 was characterized after purification with DEAE Sepharose Fast Flow and SuperdexTM 75. The molecular weight of the protease was determination by SDS-PAGE to be 32.4 kD. The optimal reaction temperature and pH of protease were 35-40 ℃ and 7.5, respectively. The protease was characterized to be a cold-adapted enzyme. It had more activity at 20-40 ℃ and a wide range of pH tolerance.The activity of the protease could be activated by Zn2+ but inhibited by Ag+, Hg2+ and EDTA-Na2 significantly. The Km and Vmax of the purified protease were 1.31 × 10-4 mol/L and 6.92×10-6 mol/(L ·s), respectively.

Key words: Enterococcus faecalis, cold-adapted acid protease, purification

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