彩色马铃薯二氢黄酮醇4-还原酶(DFR)基因的克隆及生物信息学分析肖继坪王琼郭华春云南农业大学薯类作物研究所,昆明,650201花色素苷是影响花色的主要色素,二氢黄酮醇4-还原酶(DFR)基因是花色素苷合成的关键酶基因。
本研究以云南地方彩色马铃薯品种‘剑川红’和‘转心乌’,外引品种‘黑美人’为实验材料,通过RT-PCR方法从其块茎表皮中克隆到DFR基因的完整cDNA序列,并进行了生物信息学分析。
分析结果显示供试的三个彩色马铃薯的DFR基因编码381个氨基酸,具有完整的开放式阅读框(ORF),DFR与NADPH的结合位点、底物特异性选择结合位点高度保守。
同源比对表明,三个彩色马铃薯品种的核苷酸相似性为99.24%,氨基酸同源性为98.78%,与茄科的烟草、矮牵牛等的同源性均在86%以上。
三个彩色马铃薯品种DFR都不具有信号肽,无明显跨膜区域,可能为亲水蛋白,定位于细胞质的可能性最高。
α-螺旋和无规则卷曲是DFR的主要二级结构元件,DFR属于NADB-Rossmann superfamily。
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