食品科学 ›› 2009, Vol. 30 ›› Issue (17): 270-273.doi: 10.7506/spkx1002-6630-200917062

• 生物工程 • 上一篇    下一篇

鳀鱼内源蛋白酶初步研究

吕英涛1,康从民1 ,* ,韩春超2,薛长湖3   

  1. 1. 青岛科技大学化工学院 2. 山东中医药大学 3. 中国海洋大学食品科学与工程学院
  • 收稿日期:2009-02-04 修回日期:2009-07-09 出版日期:2009-09-01 发布日期:2014-04-14
  • 通讯作者: 康从民1 ,* , E-mail:cmkang@qust.edu.cn
  • 基金资助:

    山东省自然科学基金项目(Y2007C176;Y2007C175); 山东省教育厅科技计划项目(J07YC08);
    山东省高等学校科技计划资助项目(J09LC20); 青岛市科技计划基础研究项目(09-1-3-74-JCH);
    青岛科技大学科研启动基金资助项目(0022213)

Endogenous Proteases from Digestive Tract of Anchovy

LU Ying-tao1,KANG Cong-min1,*,HAN Chun-chao2,XUE Chang-hu3   

  1. 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    2. Shandong University of Traditional Chinese Medicine, Jinan 250355, China;
    3. College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China
  • Received:2009-02-04 Revised:2009-07-09 Online:2009-09-01 Published:2014-04-14
  • Contact: KANG Cong-min1,*, E-mail:cmkang@qust.edu.cn

摘要:

采用生化方法对提取的鳀鱼内源蛋白酶粗酶的性质进行初步研究,分别考察pH 值、特异底物、蛋白酶抑制剂、Ca2+ 对内源蛋白酶的影响。结果表明,鳀鱼粗酶中主要含有四种蛋白酶,最适pH 值分别为2.5、5.5、9.0、12.5。在pH5.5~12.5 的区间内,苯甲基磺酰氟(PMSF)和大豆胰蛋白酶抑制剂(SBTI)的抑制作用明显,PMSF较SBTI 的抑制范围更广,但SBTI 在上述区间内的抑制作用更强,说明鳀鱼粗酶中存在丝氨酸蛋白酶,并且其中活性最强的可能为胰蛋白酶。另外,通过Ca2+ 对酶活的影响实验说明:Ca2+ 在pH6.5~9.0 和pH12.5~14.0 这两个范围,对于稳定酶的结构,提高酶的稳定性有重要作用。

关键词: 鳀鱼, 内源蛋白酶, 特性研究

Abstract:

The crude endogenous proteases extracted from digestive tract of anchovy were characterized by biochemical techniques. The endogenous proteases were mainly composed of four proteases whose optimum working pHs were 2.5, 5.5, 9.0, and 12.5, respectively. In the pH range from 5.5 to 12.5, both PMSF (phenylmethyl sulfonyl fluoride) and SBTI (strontium bismuth titanate) could obviously inhibit these enzymes but SBTI exhibited stronger inhibition effect than PMSF which had in inhibition effect in a wider pH range, suggesting that these enzymes contain serine protease and the enzyme with the highest activity may be trypsin. Our study demonstrates that calcium plays a significant role in stabilizing the enzyme structure and improving the stability of enzyme in the pH ranges from 6.5 to 9.0 and from 12.5 and 14.0.

Key words: anchovy, endogenous proteases, characterization

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