[关键词]
[摘要]
目的 研究白桦硫氧还蛋白(Betula platyphylla thioredoxin,BpTRX)基因全长和启动子序列及其编码结构和性质,揭示其在硫化氢(H2S)处理下BpTRX的表达模式。方法 通过PCR手段克隆BpTRX基因,应用染色体步移技术获得BpTRX启动子区序列,并对BpTRX基因、启动子及其编码蛋白进行生物信息学分析,构建BpTRX系统进化树。利用实时荧光定量PCR定量分析BpTRX基因在H2S外源胁迫处理下的表达模式。结果 BpTRX基因全长351 bp,编码了由117个氨基酸组成的蛋白。BpTRX基因与蓖麻、大豆、苜蓿和葡萄TRX-H型蛋白亲缘关系紧密。获得的BpTRX启动子区序列为873 bp,包含了转录必备的元件以及大量的胁迫响应和激素响应元件等。结论 获得BpTRX基因的全长和部分启动子序列,BpTRX基因对H2S处理的响应趋势为双峰形式,即先增加后降低、再增加再降低。
[Key word]
[Abstract]
Objective To study the full-length, promoter sequences and its coding structure and properties of thioredoxin (Trx) gene of Betula platyphylla (BpTRX), and reveal the expression pattern of BpTRX under H2S treatment. Methods The BpTRX gene was cloned by PCR, and the promoter region sequences of BpTRX was obtained by using chromosome walking technique. The BpTRX gene, the promoter and its encoded protein were analyzed by bioinformatics software. The phylogenetic tree of BpTRX was constructed. The expression patterns of BpTRX gene under H2S exogenous stress were analyzed by quantitative real-time PCR. Results The full-length of BpTRX gene is 351 bp, encoding 117 amino acids. The BpTRX gene was closely related to the TRX-H protein of castor bean, soybean, alfalfa and grape. The obtained BpTRX promoter region sequences are 873 bp, which contains the essential elements of transcription and a large number of stress response and hormone response elements. Conclusion The full length and partial promoter sequences of the BpTRX gene were obtained. The response trend of BpTRX gene to H2S treatment was in the form of bimodal, which was first rises, then decreases, then rises and then declines.
[中图分类号]
[基金项目]
中央高校基本科研业务专项基金项目(2572015DY02);黑龙江省自然科学基金资助项目(C2016005)