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大豆科学  2007 

南农87C-38大豆优质11S球蛋白Gy7基因克隆及序列分析

DOI: 10.3969/j.issn.1000-9841.2007.06.007

Keywords: 大豆,S球蛋白Gy全基因,S球蛋白GycDNA序列,克隆,序列分析

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Abstract:

大豆种子不仅富含蛋白质,而且赖氨酸含量较高,利用大豆高赖氨酸基因能够弥补谷类作物种子赖氨酸含量的不足。运用现代分子生物学技术,从高蛋白大豆南农87C-38中克隆11S球蛋白Gy7全基因及cDNA序列。经生物公司测序后,利用vectorNTI软件将所克隆的Gy7全基因及cDNA序列与Genbank(AF319776和AF319777)报道的序列进行比对分析,同源性分别为99%和99.6%。序列比对结果显示,Gy7基因cDNA与Genbank报道的序列之间所有的核苷酸差异都位于第3外显子。由此推测,第1、第2和第4外显子编码的氨基酸对于G7多肽形成特定高级结构可能具有非常重要的作用,它们在进化过程中受到的选择压力可能比第3外显子更强。根据遗传密码表推测,克隆的Gy7与Genbank报道的cDNA序列所编码的多肽,两者存在2个氨基酸组成的差异。大豆球蛋白Gy7优质基因的获得为今后利用转基因技术改良水稻、小麦等谷类作物的营养品质奠定了基础。

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