高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (7): 1245.doi: 10.7503/cjcu20160259

• 研究论文: 无机化学 • 上一篇    下一篇

稀土离子Tb3+对卵清蛋白稳定性的影响

宋珍1,3, 董金龙1, 任跃红1, 袁雯1, 张彩凤1,3, 杨斌盛2()   

  1. 1. 太原师范学院化学系, 太原 030012
    2. 山西大学分子科学研究所, 化学生物学与分子工程教育部重点实验室, 太原 030006
    3. 山西省腐植酸工程技术研究中心, 太原 030012
  • 收稿日期:2016-04-20 出版日期:2016-07-10 发布日期:2016-06-20
  • 基金资助:
    国家自然科学基金(批准号: 21571117)、 山西省留学归国基金(批准号: 2011085)和太原师范学院大学生创新项目(批准号: CXCY1629)资助

Effect of Tb3+ on the Stability of Ovalbumin

SONG Zhen1,3, DONG Jinlong1, REN Yuehong1, YUAN Wen1, ZHANG Caifeng1,3, YANG Binsheng2,*()   

  1. 1. Department of Chemistry, Taiyuan Normal University, Taiyuan 030012, China
    2. Institute of Molecular Science, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Taiyuan 030006, China
    3. Humic Acid Engineering and Technology Research Center of Shanxi Province, Taiyuan 030012, China
  • Received:2016-04-20 Online:2016-07-10 Published:2016-06-20
  • Contact: YANG Binsheng E-mail:yangbs@sxu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21571117), the Returned Oversea Fund of Shanxi Province, China(No.2011085) and the Innovation Project of Undergraduate of Shanxi Normal University, China(No.CXCY1629)

摘要:

在室温、 pH=7.4、 10 mmol/L 4-羟乙基哌嗪乙磺酸(Hepes)缓冲溶液条件下, 利用荧光光谱研究了卵清蛋白(Ova)与Tb3+的结合性质. 利用荧光探针2-对甲苯胺基-6-萘磺酸钠(TNS)检测了Tb3+对Ova疏水区的影响. 通过化学变性实验分析了Ca2+和Tb3+对Ova结构稳定性的影响. 结果表明, Ova可以与Tb3+形成1∶2的复合物, Tb3+的结合使其疏水区暴露程度增加, TNS的荧光增强. Ova的解折叠曲线呈现三态的变化(N?I?U). Ca2+可以增加I?U过程的稳定性, Tb3+对N?I和I?U两个解折叠过程都有影响.

关键词: 卵清蛋白, Tb3+, 稳定性

Abstract:

The binding properties of Tb3+ with ovalbumin were measured by fluorescence spectra at room temperature in pH=7.4, 10 mmol/L 4-(2-hydroxyethyl)-1-piperazinecthanesulfonic acid(Hepes). The effect of Tb3+ on the hydrophobic region of ovalbumin was measured by hydrophobic probe 2-p-toluidino-6-naphthalenesalfonic acid(TNS). The effects of Ca2+ and Tb3+ on the stability of ovalbumin were analyzed by chemical unfolding methods. The results suggested that ovalbumin can form 1∶2 complexes with Tb3+. The binding of Tb3+ increased the hydrophobic surface of ovalbumin, and the fluorescence intensity of TNS increased. The unfolding curves of ovalbumin showed two transition, N?I and I?U. Ca2+ can increase the stability of transition I?U and Tb3+ can increase the stability of transitions N?I and I?U.

Key words: Ovalbumin, Tb3+, Stability(Ed.: F, K, M)

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