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作物学报 ›› 2011, Vol. 37 ›› Issue (08): 1497-1502.doi: 10.3724/SP.J.1006.2011.01497

• 研究简报 • 上一篇    

普通小麦品种小偃54中α/β-醇溶蛋白编码基因的克隆与序列分析

张晓霞1,2，焦浈1，董振营2，李世明2，王燃2，凌宏清2，秦广雍1,*，王道文2,*   

  1. 1郑州大学 / 河南省离子束生物工程重点实验室, 河南郑州 450052；2中国科学院遗传与发育生物学研究所 / 植物细胞与染色体工程国家重点实验室，北京 100101
  • 收稿日期:2011-01-25 修回日期:2011-03-26 出版日期:2011-08-12 网络出版日期:2011-06-13
  • 通讯作者: 秦广雍, E-mail: qinguangyong@zzu.edu.cn; 王道文, E-mail: dwwang@genetics.ac.cn
  • 基金资助:

    本研究由植物细胞与染色体工程国家重点实验室开放课题(PCCE-2008-KF-02)和河南省重大科技专项(081100110500)资助。

Cloning and Sequence Analysis of α/β-gliadin Genes from Common Wheat Variety Xiaoyan 54

ZHANG Xiao-Xia1,2,JIAO Zhen1,DONG Zhen-Ying2,LI Shi-Ming2,WANG Ran2,LING Hong-Qing2,QIN Guang-Yong1,*,WANG Dao-Wen2,*   

  1. 1 Henan Provincial Key Laboratory of Ion Beam Bioengineering, Zhengzhou University, Zhengzhou 450052, China; 2 State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2011-01-25 Revised:2011-03-26 Published:2011-08-12 Published online:2011-06-13
  • Contact: 秦广雍, E-mail: qinguangyong@zzu.edu.cn; 王道文, E-mail: dwwang@genetics.ac.cn

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摘要： 醇溶蛋白是小麦籽粒贮藏蛋白的重要组分，其组成与含量对小麦加工品质具有重要影响。本研究建立了利用PCR从普通小麦基因组BAC文库中筛选含有α/β-醇溶蛋白基因序列BAC克隆的方法，并获得9个不同的含有α/β-醇溶蛋白基因的BAC克隆。从其中鉴定出17个α/β-醇溶蛋白基因，其编码区序列长度为852~957 bp。12个序列在编码区内存在提前终止密码子，推测为假基因。其他5个成员(Gli-Xy54-1、Gli-Xy54-2、Gli-Xy54-3、Gli-Xy54-7和Gli-Xy54-13)分别编码291、310、311、287和317个氨基酸残基，都具有α/β-醇溶蛋白一级结构的典型特征。根据推导的氨基酸序列中乳糜泻病诱发因子的分布情况及多聚谷氨酰胺重复区的长度差异，推测Gli-Xy54-7可能定位于6A染色体，Gli-Xy54-2、Gli-Xy54-3和Gli-Xy54-13可能定位于6B染色体，Gli-Xy54-1可能定位于6D染色体。基因聚类分析支持了上述推论。这是第一次从普通小麦中筛选到包含α/β-醇溶蛋白基因的BAC克隆，并从中得到目标基因全长，对进一步研究普通小麦基因组中α/β-醇溶蛋白编码基因的组成、表达与功能有较好的参考价值。

关键词: 普通小麦, α/β-醇溶蛋白, BAC文库筛选, 基因克隆

Abstract: We developed a method for identifying the genomic BAC clones containing the α/β-gliadin gene sequences of common wheat (Triticum aestivum L.). Using this method, nine unique positive clones harboring α/β-gliadin genes were obtained from the BAC library of the elite wheat variety Xiaoyan 54. From these BAC clones, 17 distinct α/β-gliadin gene sequences were isolated, 12 of which were pseudogenes because of the presence of one or more premature stop codons in their open reading frame (ORF). The remaining five genes (tentatively designated Gli-Xy54-1, Gli-Xy54-2, Gli-Xy54-3, Gli-Xy54-7, and Gli-Xy54-13) possessed intact ORF. Their deduced protein sequences contained 291, 310, 311, 287, and 317 amino acid residues, respectively, and resembled highly the primary structure of previously reported α/β-gliadins. The presence of celiac disease inducing epitopes and the length of the polyglutamine repeats in the five deduced α/β-gliadins were analyzed. Based on these data, it was suggested that Gli-Xy54-1 might be located on chromosome 6A, Gli-Xy54-2, Gli-Xy54-3, and Gli-Xy54-13 on chromosome 6B, and Gli-Xy54-7 on chromosome 6D. This proposition was supported by phylogenetic analysis of the gliadin gene sequences isolated here and previously. As far as we know, this work represents the first report on the identification of BAC clones containing the α/β-gliadin genes from common wheat. The genes isolated here may facilitate further investigations on the composition, expression and function of α/β-gliadin genes in common wheat.

Key words: Common wheat, α/β-gliadin, BAC library screening, Gene cloning

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