食品科学 ›› 2019, Vol. 40 ›› Issue (20): 192-199.doi: 10.7506/spkx1002-6630-20190104-052

• 生物工程 • 上一篇    下一篇

选择性修饰MCM-41固定化脂肪酶及其催化合成甾醇酯的应用

张欣,陈书曼,吴楠,王彤,裴兴武,江连洲,韩翠萍,于殿宇   

  1. (东北农业大学食品学院,黑龙江 哈尔滨 150030)
  • 出版日期:2019-10-25 发布日期:2019-10-25
  • 基金资助:
    黑龙江省教育厅2018年度省属高校科技成果研发、培育项目(TSTAU-C2018011)

ZHANG Xin, CHEN Shuman, WU Nan, WANG Tong, PEI Xingwu, JIANG Lianzhou, HAN Cuiping, YU Dianyu

ZHANG Xin, CHEN Shuman, WU Nan, WANG Tong, PEI Xingwu, JIANG Lianzhou, HAN Cuiping, YU Dianyu   

  1. (College of Food Science and Technology, Northeast Agricultural University, Harbin 150030, China)
  • Online:2019-10-25 Published:2019-10-25

摘要: 将南极假丝酵母脂肪酶B(Candida antarctica lipase B,CALB)与三亚油酸甘油三酯进行分子对接,得到CALB的活性中心组成,其氨基酸残基中游离ε-NH2分布在远离活性中心的位置上,—COOH有小部分分布在活性中心。针对CALB活性基团的分布特点将MCM-41修饰成具有醛基的G-MCM-41及具有氨基的NH2-MCM-41。当G-MCM-41与CALB固定时,醛基与ε-NH2结合,酶负载量为87.4 mg/g,活性为1 176 U/g,活性较高,当NH2-MCM-41与CALB固定时,氨基与—COOH结合,酶负载量为89.6 mg/g,活性为672 U/g,活性相对较低,结果证明了CALB分子氨基酸残基分布的结论。以一级大豆油和植物甾醇为底物,固定化脂肪酶催化酯交换反应,经响应面试验优化后酯交换率达到87.4%。

关键词: 分子对接, 活性中心, 修饰, MCM-41, 固定化, 酯交换

Abstract: Candida antarctica lipase B (CALB) was docked with trilinolein to obtain the active site composition of CALB. The free ε-NH2 residues of CALB were located far from the active site and a small part of –COOH was located at the active site. Given the distribution characteristics of the CALB reactive groups, MCM-41 was modified into G-MCM-41 having aldehyde groups or NH2-MCM-41 having amino groups. CALB was immobilized with G-MCM-41 by binding the aldehyde group to ε-NH2 with a loading capacity of 87.4 mg/g, and the activity of the immobilized enzyme was as high as 1 176 U/g. CALB was immobilized with NH2-MCM-41 by binding the amino group to –COOH with a loading capacity of 89.6 mg/g, and the activity the immobilized enzyme was only 672 U/g. The results confirmed the distribution of amino acid residues in the CALB molecule. Using first-grade soybean oil and phytosterol as substrates, the transesterification rate of the immobilized lipase was 87.4% under the optimum conditions established using response surface methodology.

Key words: molecular docking, active center, modification, MCM-41, immobilization, transesterification

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