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植物学报  2015 

植物莽草酸途径EPSPS蛋白的分子进化和基因结构分析

DOI: 10.3724/SP.J.1259.2015.00295, PP. 295-309

Keywords: 植物,EPSPS蛋白,系统发育分析,基因结构

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Abstract:

?EPSPS既是植物、微生物和真菌等生物芳香族氨基酸生物合成途径——莽草酸途径中的关键酶,也是除草剂草甘膦的靶标酶。EPSPS的克隆能为草甘膦抗性转基因作物的研发提供候选基因。该研究运用比较基因组学方法,通过对41种不同植物的43条EPSPS蛋白序列进行进化分析,取得主要结果如下:(1)不同植物EPSPS蛋白的相似性很高,且具有相同的结构域、保守基序和保守位点,但是其叶绿体转运肽序列差异显著;(2)系统发育分析表明,EPSPS基因按照双子叶植物纲和单子叶植物纲分为2个大的分支,各个小的分支又按照植物的种属亲缘关系进行分支和聚类;(3)基因结构分析表明,植物EPSPS基因基本都含有8个外显子和7个内含子,且所对应外显子的长度相当,而内含子的长度差异很大,说明在植物基因组进化过程中造成EPSPS基因结构差异的主要因素是内含子的改变。研究结果将为揭示植物EPSPS蛋白的结构功能提供参考。

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