摘要
GA2ox是赤霉素合成代谢的关键酶,以苹果品种富士茎尖为供试材料,应用同源克隆技术克隆GA2ox基因,获得长度为1 656 bp的DNA序列和1 014 bp cDNA序列。对比分析表明,DNA序列存在3个外显子和2个内含子。GA2ox的开放性阅读框编码337个氨基酸残基,推断其相对分子量为37.679 8 kDa,等电点为6.41。蛋白质结构域检索表明,GA2ox属于依赖于2-酮戊二酸的双加氧酶家族成员;氨基酸同源性分析表明,GA2ox与已报道的其他植物的GA2ox氨基酸序列同源性为51%~97%;氨基酸聚类分析表明,苹果和梨首先聚类,其次是毛果杨。
GA 2-oxidase(GA2ox)is a critical enzyme in the pathway of gibberellins biosynthesis.In this research,GA2ox gene was isolated from Fuji stem apical tissue by homologous cloning technology.The cDNA sequence of GA2ox was 1 656 bp in length with 3 exons and 2 introns.Its open reading frame was 1 014 bp which encoding a protein of 337 amino acids.Molecular weight and isoelectric point of the protein was 37.679 8 kDa and 6.41,respectively.Conserved domains showed that the enzyme belonged to the class 2-oxoglutarate-dependent dioxygenases.Amino acids homology analysis indicated that the sequence had 51%-97% similarity with those of other reported plants.Cluster analysis showed that GA2ox from pear was clustered together with GA2ox from apple firstly,and followed by that from black cottonwood.
出处
《华北农学报》
CSCD
北大核心
2012年第5期55-59,共5页
Acta Agriculturae Boreali-Sinica
基金
山东省良种工程项目
青岛市科技计划基础研究项目(11-2-4-5(4)-jch)