关键词:
艾纳香
咖啡酸氧甲基转移酶
基因克隆
生物信息学分析
摘要:
艾纳香是一种多年生草本或亚灌木植物,属于菊科艾纳香属。艾纳香含有挥发油、黄酮类以及苯丙素类等成分。咖啡酸氧甲基转移酶基因(COMT)可催化苯丙素类化合物羟基上氧原子的甲基化,也是参与木质素和褪黑素生物合成的关键基因,在调节植物生长品质和抗逆性中发挥重要作用。本文以艾纳香咖啡酸氧甲基转移酶(BbCOMT)为研究对象,通过PCR获得该基因全长,对该基因进行生物信息学分析。结果显示,BbCOMT基因的完整开放阅读框长1062 bp,共编码353个氨基酸;生物信息学分析结果显示BbCOMT为跨膜蛋白,无信号肽;含有二聚体结构域和AdoMet-MTase保守结构域;且BbCOMT与青蒿聚在同一分支,氨基酸一致度为72.39%。本研究为黔产艾纳香中苯丙素类化合物的合成研究奠定基础,进而提高艾纳香药用价值,同时为进一步分析咖啡酸氧甲基转移酶基因的功能提供分子基础。Blumea balsamifera is a perennial or subshrub plant belonging to the Asteraceae family of the Blumea genus. Blumea balsamifera contains volatile oil, flavonoids, and phenylpropanoid compounds. Caffeoyl-CoA O-methyltransferase gene (COMT) can catalyze the methylation of hydroxyl group on phenylpropanoid compounds, and it is also a key gene involved in lignin and melatonin biosynthesis. It plays an important role in regulating plant growth quality and resistance to adverse conditions. In this study, BbCOMT gene was taken as the research object, and the gene was cloned by PCR. Bioinformatics analysis was conducted on the gene. The results showed that the complete open reading frame of BbCOMT gene was 1062 bp, and it encoded 353 amino acids. Bioinformatics analysis showed that BbCOMT was a transmembrane protein without a signal peptide, containing a dimerization domain and a conserved AdoMet-MTase domain. BbCOMT was clustered with Artemisia on the same branch, with an amino acid identity of 72.39%. This study lays a foundation for the synthesis of phenylpropanoid compounds in Blumea balsamifera, thereby improving its pharmaceutical value, and it also provides a molecular basis for further analyzing the function of the caffeoyl-CoA O-methyltransferase gene.