食品科学 ›› 2010, Vol. 31 ›› Issue (17): 232-235.doi: 10.7506/spkx1002-6630-201017052

• 生物工程 • 上一篇    下一篇

as1-酪蛋白IgE抗原决定簇的识别

丛艳君1,任发政2 ,* ,云战友3   

  1. 1.北京工商大学化学与环境工程学院
    2.中国农业大学食品科学与营养工程学院 3.内蒙古伊利实业集团股份有限公司
  • 收稿日期:2010-01-05 出版日期:2010-09-15 发布日期:2010-12-29
  • 通讯作者: 任发政 E-mail:congyj@th.btbu.edu.cn
  • 基金资助:

    “十一五”国家科技支撑计划项目(2006BAD04A06)

Identification of IgE-binding Epitopes on αs1-Casein

CONG Yan-jun1,REN Fa-zheng2,*,YUN Zhan-you3   

  1. 1. School of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China;
    2. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China;
    3. Inner Mongolia Yili Industrial Group Co. Ltd., Hohhot 010080, China
  • Received:2010-01-05 Online:2010-09-15 Published:2010-12-29
  • Contact: REN Fa-zheng E-mail:congyj@th.btbu.edu.cn

摘要:

以αs1- 酪蛋白氨基酸序列为模板,错位合成αs1- 酪蛋白多肽,以收集到的牛乳过敏患者血清为抗体,鉴定αs1- 酪蛋白IgE 抗原决定簇,分析影响致敏性的关键氨基酸,探讨牛乳过敏机理。结果表明:αs1- 酪蛋白IgE 抗原决定簇有5 条,它们在αs1- 酪蛋白的定位分别为aa21~35、aa26~40、aa91~105、aa141~155、aa186~200。影响αs1- 酪蛋白致敏性的关键氨基酸为组氨酸、谷氨酸、脯氨酸。说明特异性水解抗原决定簇或定点修饰过敏原氨基酸实现脱敏的方法是可行的。

关键词: 牛奶, as1-酪蛋白, IgE, 抗原决定簇

Abstract:

A series of casein overlapping decapeptides (offset by 5 amino acids) were synthesized on the basis of the sequence of αs1-casein. IgE-binding epitopes were identified using individual sera from cow milk allergic patients. Moreover, the critical amino acids (AAs) for IgE binding were explored. The results indicated that five IgE-binding epitopes were identified to locate in the sequence of aa21-35, aa26-40, aa91-105, aa141-155 and aa186-200, respectively. In addition, histidine, glutamic acid and proline were the critical amino acids for the allergenicity of αs1-casein.

Key words: cow milk, αs1-casein, IgE, epitope

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