食品科学

• 工艺技术 • 上一篇    下一篇

TGase催化玉米醇溶蛋白糖基化改性

周利敏,刘晓兰,刘 玥,郑喜群*   

  1. 齐齐哈尔大学食品与生物工程学院,农产品加工黑龙江省普通高校重点实验室,黑龙江 齐齐哈尔 161006
  • 出版日期:2014-12-25 发布日期:2014-12-29
  • 通讯作者: 郑喜群
  • 基金资助:

    国家自然科学基金面上项目(31371726)

TGase-Catalyzed Glycosylation of Zein

ZHOU Li-min, LIU Xiao-lan, LIU Yue, ZHENG Xi-qun*   

  1. Key Constructive Laboratory of Processing Agricultural Products of Heilongjiang Province Normal University,
    College of Food and Biological Engineering, Qiqihar University, Qiqihar 161006, China
  • Online:2014-12-25 Published:2014-12-29
  • Contact: ZHENG Xi-qun

摘要:

利用转谷氨酰胺酶(transglutaminase,TGase)催化玉米醇溶蛋白与氨基葡萄糖盐酸盐(glucosamine hydrochloride,GAH)发生交联反应。通过SDS-聚丙烯酰胺凝胶电泳确认玉米醇溶蛋白与GAH发生交联反应。以玉米醇溶蛋白糖基化修饰产物中GAH导入量为指标,优化糖基化反应条件,并对玉米醇溶蛋白糖基化修饰样品的溶解性进行了表征。结果表明,最适的糖基化反应条件为底物质量浓度5 g/100 mL、TGase添加量50 U/g(以玉米醇溶蛋白计)、玉米醇溶蛋白中酰基供体与GAH中的酰基受体物质的量比1∶6、初始pH 8.0、反应温度44 ℃、反应时间7 h;此反应条件下,玉米醇溶蛋白中GAH的最大导入量为(11.34±0.21) mg/g(以玉米醇溶蛋白计)。与玉米醇溶蛋白相比,玉米醇溶蛋白交联样品与糖基化修饰样品的溶解性均得到提高,玉米醇溶蛋白糖基化修饰样品的溶解性最高。

关键词: 玉米醇溶蛋白, 转谷氨酰胺酶, 糖基化, 蛋白质改性

Abstract:

In the present work, transglutaminase (TGase) was used to catalyze covalent cross-linking reaction between
zein and glucosamine hydrochloride (GAH). The cross-linking reaction was identified by SDS-PAGE. The reaction
conditions were optimized based on the amount of GAH conjugated onto zein. Meanwhile, the solubility of zein modified
by glycosylation was characterized. The results showed that the optimized reaction conditions for TGase/zein concentration,
zein ratio molar ratio of acyl donor to acceptor, initial reaction pH, temperature and reaction time were 5 g/100 mL, 50 U/g,
1:6, 8.0, 44 ℃ and 7 h respectively. Under these conditions, the amount of GAH conjugated onto zein was (11.34 ± 0.21)
mg/g zein. Compared with intact zein, the solubility of both cross-linked zein and glycosylated zein was improved, and
glycosylation resulted in the highest solubility.

Key words: zein, transglutaminase (TGase), glycosylation, protein modification

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