| 禾谷类植物胚凝集素基因的分子起源与进化 |
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| 引用本文： | 刘庆法,郝峥嵘,曲志才,陈永青,沈大棱.禾谷类植物胚凝集素基因的分子起源与进化[J].复旦学报(自然科学版),2001,40(5):530-534. |
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| 作者姓名： | 刘庆法 郝峥嵘 曲志才 陈永青 沈大棱 |
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| 作者单位： | 1. 复旦大学生命科学学院遗传学研究所;西北农业大学农学系
2. 复旦大学生命科学学院遗传学研究所 |
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| 基金项目： | 上海市科委科学与技术发展基金资助项目（953907009） |
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| 摘 要： | 对禾谷类植物胚凝集素的基因结构进行了详细分析，发现该基因有4个hevein(结合域）编码区，研究表明，禾谷类植物胚凝集素基因是由1个较小的带单个hevein的祖先基因（或片段）经过2次顺接重复产生的，第一次重复产生1个双hevein结构，然后以这个双hevein结构为单位再次发生重复，最终产生了具有4个hevein的禾谷类胚凝集素基因的原型。对42个不同来源的hevein DNA序列进化关系的研究进一步证实了上述结论。初步发现，小麦B组染色体编码的麦胚凝集素WGA－B基因可能是该类禾谷类凝集素基因中比较原始的类型。植物hevein的氨基酸通式可以表述为：CXXXXCCSXXGXCGXXXXXC。
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| 关 键 词： | 胚凝集素 禾谷类 结合域 基因结构分析 结合糖蛋白 分子起源 进化机制 |
| 文章编号： | 0427-7104(2001)05-0530-05 |
Molecular Origin and Evolution of Germ Lectin Gene in Cereals |
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| LIU Qing-fa,HAO Zheng-rong,QU Zhi-cai,CHEN Yong-qing,SHEN Da-leng.Molecular Origin and Evolution of Germ Lectin Gene in Cereals[J].Journal of Fudan University(Natural Science),2001,40(5):530-534. |
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| Authors: | LIU Qing-fa HAO Zheng-rong QU Zhi-cai CHEN Yong-qing SHEN Da-leng |
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| Abstract: | A detailed sequence dissection and multiple comparison of the domain-coding reg ions clearly showed that cereal germ lectin genes were evolved from a small ance stral gene (or a small truncated fragment) by two duplications, which resulted i n the modern form with four tandem-duplicated highly-homologous chitin-bindin g domains. The first duplication produced a double hevein structure. Then the do uble hevein structure duplicated further and resulted in a tetra-hevein germ le ctin gene, which diversified further in each cereal species. Germ lectin gene encoded by genome B of wheat (WGA-B) was presumed as the anc ient form of germ lectin gene. The conserved amino acid sequence of heveins in plants was inferred as CXXXXCCSXXGXCGXXXXXC. |
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