华南理工大学学报(自然科学版) ›› 2016, Vol. 44 ›› Issue (10): 137-142.doi: 10.3969/j.issn.1000-565X.2016.10.020

• 食品科学与技术 • 上一篇    下一篇

pH 对小麦HMW-GS 1Dx5 的N 端结构域分子特性的影响

胡松青1,2 张亚萍1 王敬敬1 刘光毅1 黄滟波1,3 李琳1,2 侯轶3†   

  1. 1. 华南理工大学 食品科学与工程学院,广东 广州 510640; 2. 华南理工大学 广东省天然产物绿色加工与产品安全重点实验室,广东 广州 510640; 3. 华南理工大学 制浆造纸工程国家重点实验室,广东 广州 510640
  • 收稿日期:2016-03-11 修回日期:2016-06-09 出版日期:2016-10-25 发布日期:2016-09-01
  • 通信作者: 侯轶(1973-),女,博士,高级工程师,主要从事生物质利用研究. E-mail:ceyhou@scut.edu.cn
  • 作者简介:胡松青(1972-),男,博士,教授,主要从事食品蛋白质生物化学研究. E-mail:fesqhu@ scut. edu. cn
  • 基金资助:

    国家自然科学基金资助项目(31171630,31471691,31130042);高等学校博士学科点专项科研基金资助项目(20130172110018);广东省科技计划项目(2014A010107002);佛山市科技计划项目(2015AG10011)

Effect of pH on Molecular Characteristics of N-Terminal Domain of Wheat HMW-GS 1Dx5

HU Song-qing1,2 ZHANG Ya-ping1 WANG Jing-jing1 LIU Guang-yi1 HUANG Yan-bo1,3 LI Lin1,2 HOU Yi3   

  1. 1.School of Food Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety,South China University of Technology,Guangzhou 510640,Guangdong,China; 3.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2016-03-11 Revised:2016-06-09 Online:2016-10-25 Published:2016-09-01
  • Contact: 侯轶(1973-),女,博士,高级工程师,主要从事生物质利用研究. E-mail:ceyhou@scut.edu.cn
  • About author:胡松青(1972-),男,博士,教授,主要从事食品蛋白质生物化学研究. E-mail:fesqhu@ scut. edu. cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(31171630,31471691,31130042),the Research Fund for the Doctoral Program of Higher Education of China(20130172110018) and the Science and Technology Planning Project of Guangdong Province(2014A010107002)

摘要: 采用内源荧光光谱、总自由巯基定量、非还原和还原十二烷基硫酸钠聚丙烯酰胺凝胶电泳(SDS-PAGE)以及原子力显微镜(AFM)等方法探究了 pH 值对高分子量麦谷蛋白亚基(HMW-GS)1Dx5 的 N 端结构域(1Dx5-N)聚集体形成的影响规律. 结果显示:与酸性和碱性条件下相比,中性(pH =7. 0)条件下,1Dx5-N 的荧光最大发射波长发生了蓝移,表明中性条件下 1Dx5-N 聚集程度增加;与酸性和碱性处理条件相比,中性条件下 1Dx5-N的总自由巯基含量降低,且形成了更多的二聚体和高聚体,表明中性环境更有利于 1Dx5-N 的聚集,且分子间二硫键对聚集体的形成发挥了重要作用;中性条件下形成了颗粒直径相对较大的聚集体,进一步证明了中性条件更有利于 1Dx5-N 的聚集. 从而从分子层面证明了中性条件下进行面制品加工的合理性.

关键词: 高分子量麦谷蛋白亚基, N 端结构域, 聚集体

Abstract:

By means of intrinsic fluorescence measurements,total free sulfhydryl (SH) quantitation,non-reducing and reducing SDS-PAGE analysis and AFM,the effect of pH on the forming of the N-terminal domain aggregation of high molecular weight glutenin subunits (HMW-GS) 1Dx5 (1Dx5-N) was investigated.The results show that (1) in comparison with the acidic and alkaline conditions,the maximum emission wavelength of 1Dx5-N displays a blue shift under the neutral pH condition (pH 7. 0),indicating that 1Dx5-N under the neutral pH condition has a higher degree of aggregation; (2) in comparison with the acidic and alkaline conditions,the 1Dx5-N under the neutral condition is of a lower total free sulfhydryl (SH) content with more dimers and polymers,indicating that,in the ag- gregation of 1Dx5-N,the neutral condition is more helpful and the disulfide bonds play an important role; and (3) under the neutral pH condition,the aggregation of greater particle size forms,which further proves that the neutral pH condition is superior to the acidic and alkaline conditions in terms of the aggregation of 1Dx5-N.Thus,the rationality of the flour product processing under the neutral condition is demonstrated at the molecular level.

Key words: high molecular weight glutenin subunit, N-terminal domain, aggregation

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