Isolation and Structural Analysis of DRE-Binding Transcription Factor from Maize (Zea mays L.)

文献类型： 外文期刊

第一作者： Qin, F

作者： Qin, F;Li, J;Zhang, GY;Zhao, J;Chen, SY;Liu, Q

作者机构：

关键词： maDREB1;transcription factor;dehydration-responsive element (DRE)

期刊名称：ACTA BOTANICA SINICA （ 影响因子：0.599； ）

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收录情况： SCI

摘要： Dehydration-responsive element-binding (DREB) proteins specifically binding with dehydration-responsive element (DRE) have been identified as a kind of important transcription activator of plants under drought, high salt and cold stress. The conserved amino acid residues of Val (14th residue) and Glu (19th residue) in AP2/EREBP domain of DREB1A have been identified to be two key points in determining the binding ability of DREB gene with DRE element. Using the yeast one-hybrid system, we isolated one mai/e DREB gene named maDREB1 by screening cDNA library. Trans-activation experiment in yeast reporter strain demonstrated that maDREBl protein could function as a DREB transcription factor activating target gene expression by specifically binding to the DRE cis-element. To assess the functional significance of these two residues in maDREB1, the V14 and E19 were substituted individually or doubly by Ala and Asp. Point mutation analysis showed that V14 substitution made significant loss of binding ability with DRE element, while point mutation of E19 had less effect. If the substitution happened simultaneously to these two residues, it would lead to great loss of the ability of binding with DRE element. It suggested that V14 and E19 were both important in protein-DNA interacting in maDREB1, though 14V was more essential. The copy number and expression pattern of maDREB1 was discussed.

分类号： Q94

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