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园艺学报 ›› 2012, Vol. 39 ›› Issue (1): 143-150.

• 研究报告 • 上一篇    下一篇

甜樱桃DELLA蛋白基因PaGAI的克隆与表达分析

钟 翡1,沈欣杰1,刘 芳1,袁华招1,刘兰英2,李天红1,*   

  1. (1中国农业大学农学与生物技术学院,北京市果树逆境生理与分子生物学重点开放实验室,北京 100193;2北京市海淀区植物组织培养技术实验室,北京 100091)
  • 收稿日期:2011-09-15 修回日期:2011-11-24 出版日期:2012-01-25 发布日期:2012-01-25
  • 通讯作者: 李天红

Cloning and Expression Analysis of PaGAI gene of DELLA Protein from Prunus avium

ZHONG Fei1,SHEN Xin-jie1,LIU Fang1,YUAN Hua-zhao1,LIU Lan-ying2,and LI Tian-hong1,*   

  1. (1College of Agronomy and Biotechnology,Key Laboratory of Stress Physiology and Molecular Biology for Fruit Trees of Beijing,China Agricultural University,Beijing 100193,China;2Laboratory of Plant Tissue Culture Technology,Haidian District,Beijing 100091,China)
  • Received:2011-09-15 Revised:2011-11-24 Online:2012-01-25 Published:2012-01-25
  • Contact: LI Tian-hong

摘要: 利用RT-PCR和RACE技术从甜樱桃(Prunus avium L.)嫩叶中克隆了赤霉素信号转导途径中的关键负调控因子DELLA蛋白基因cDNA全序列,将其命名为PaGAI。该基因cDNA全长2 310 bp,开放阅读框ORF为1 788 bp,推测其编码一个含有595个氨基酸残基的多肽链,蛋白质分子量约64 kD。生物信息学分析结果表明,PaGAI编码蛋白具有DELLA蛋白保守结构域,其N端存在两个非常保守的酸性结构域DELLA和VHYNP作为信号感知区域,C端有VHIID、RVER 和SAW结构域作为阻遏区域。PaGAI与其它植物的DELLA蛋白具有较高的同源性,其中与苹果MdRGL2b蛋白同源性最高,达到84%。构建pGEX-4T-1/PaGAI原核表达体系,并转化E. coli BL21,经0.5 mmol · L-1 IPTG诱导蛋白表达,SDS-PAGE检测获得了分子质量为91 kD的融合蛋白,半定量RT-PCR分析表明,PaGAI在花、果实、叶片、韧皮部中普遍表达,在花与韧皮部中的表达远远强于在果实与叶片中的表达。

关键词: 甜樱桃, DELLA蛋白, 基因克隆, 原核表达

Abstract: DELLA protein is a key negative regulation factor of gibberellins(GAs)signal transduction pathway. A whole cDNA sequence of DELLA protein gene,named PaGAI,was cloned from Prunus avium L. tender leaves using RT-PCR and RACE-PCR. The cDNA of PaGAI had a length of 2 310 bp and contain an opening-reading frame(ORF)of 1 788 bp,which was supposed to encode a 595 amino-acid residues polypeptide of 64 kD. Bioinformatics analysis showed that the protein encoded by PaGAI had a conservative structural domain of DELLA protein. It had two strict conservative amino acid domains DELLA and VHYNP in the N terminal and three repression regions of VHVID,RVER and SAW in the C terminal. PaGAI,with high homologous with the DELLA proteins in some other plants,and showed the highest homology of 84% with Malus domestica. The prokaryotic expression system of pGEX-4T-1/PaGAI was constructed and transformated into E. coli BL21,and the protein expression was induced by 0.5 mmol · L-1 IPTG and a 91 kD fusion protein was detected by SDS-PAGE. Semi-quantitative RT-PCR analysis showed that PaGAI widely expressed in flower,fruit,leaf and phloem,and PaGAI in the expression of flower and phloem is much stronger than in fruit and leaf.

Key words: Prunus avium, DELLA protein, gene cloning, prokaryotic expression

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