葡萄F-box基因VvF-box5基因结构与表达分析
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国家转基因生物新品种培育科技重大专项(2014ZX0800916B)、河北省农林科学院基本科研业务费(494-0401-JBN-8X6P)和宁夏农林科学院科技创新先导资金(NKYJ-1513)。


Gene Structure and Expression Analysis of F-box Gene VvF-box5 in Grapevine
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    摘要:

    F-box蛋白广泛存在于真核生物中,主要参与细胞周期调控、凋亡及多种激素信号转导等过程;近几年发现,F-box蛋白还介导了植物对逆境胁迫的应答响应,对维持植物正常生长发育至关重要。干旱等非生物逆境胁迫严重影响了葡萄正常生长发育和果实品质,克隆并分析干旱响应基因对改良葡萄的抗性有重要意义。本研究根据葡萄干旱转录组分析结果,发现11个F-box基因在干旱胁迫下表达量明显上调;其中,VvF-box5基因位于葡萄第19条染色体上,对干旱胁迫的响应明显高于其他F-box成员;VvF-box5基因含有5个外显子和4个内含子,内含子均含有保守的GT…AG序列;VvF-box5基因包含1824 bp的开放阅读框,编码607个氨基酸,氨基酸序列的N端含有1个保守的F-box结构域,C端包含1个FBD和2个LRR结构域。启动子元件分析表明,VvF-box5基因含有多种逆境应答元件,包括GA响应元件GARE-motif、MeJA响应元件CGTCA-motif、干旱胁迫相关元件ERE、HSE和LTR、光应答顺式作用元件ACE、Box4和Sp1以及与细胞周期调节和发育相关的原件等。实时荧光定量PCR结果显示,在干旱、高盐、ABA和MeJA处理下,VvF-box5基因的表达量明显升高;亚细胞定位结果显示,VvF-box5蛋白主要定位于圆葱表皮细胞的细胞核中;VvF-box5的过表达明显提高了转基因拟南芥在干旱处理下的成活率。另外,本研究利用原核表达系统诱导6×His-VvF-box5融合蛋白的表达,并使用蛋白标记亲和层析柱纯化获得了6×His-VvF-box5融合蛋白,为下一步深入研究VvF-box5的功能鉴定基础。

    Abstract:

    F-box proteins, widely existing in eukaryotes, were involved in cell cycle regulation, apoptosis and multiple hormone signal transduction. Recently, it was showed that F-box proteins mediated the responses to abiotic and biotic stresses, which is crucial to maintain the normal growth and development for plant. Drought and other abiotic stresses seriously affected plant growth and development. It is urgent to solve the problem which enhances the drought resistance of plant at present. The Grapevine, one of important fruit trees, was widely cultivated among China and world. Drought stress severely affected the plant growth and dramatically reduced the fruit quality of grapevine. Therefore, it has a great meaning to isolate the drought-responsive genes and analyze its functions for stress-resistant improvement in grapevine. According to the analysis of drought treated grapevine transcriptome, we isolated 11 F-box genes obviously up-regulated under drought stress. Pfam software analysis showed these F-box genes encode amino acid sequences having a complete F-box domain. Among them, VvF-box5 exhibited higher expression level compared with other genes and VvF-box5 is located on the 19th chromosome. There are 1 824 bp in opening reading frame of the VvF-box5, including 5 exons and 4 introns according to gene sequence analysis. VvF-box5 protein contains 1 F-box domain in its N terminal and a fibrinogen-like domain(FBD) and two leucine-rich repeat(LRR)in its C terminal. Protein secondary structure prediction analysis showed that the VvF-box5 contain 15 α-helixs and 14 β-pleated sheets. The promoter element analysis showed that the promoter of VvF-box5 contains multiple stresses-responsive elements, such as GA response element GARE-motif, MeJA response element CGTCA-motif, Drought stress related components ethylene-responsive element (ERE), heat stress-responsive element (HSE) and low temperature responsive element (LTR), light response cis elements ACE, Box 4 and Sp1 and other element related to cell cycle regulation and development. Real-time qRT-PCR showed that VvF-box5 responded to drought, salt, ABA and JA. Subcellular localization showed that VvF-box5 was mainly located in nucleus in onion epidermis cells. Overexression of VvF-box5 clearly improved the drought tolerance in transgenic plants. In addition, the fusion protein 6×His-VvF-box5 was induced and expressed in prokaryotic expression system and purified by Ni-NTA Resin, laying foundation for studying VvF-box5 functions.

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于兰芳,周硕,张双喜,等.葡萄F-box基因VvF-box5基因结构与表达分析[J].植物遗传资源学报,2018,19(2):361-369.

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  • 收稿日期:2017-08-21
  • 最后修改日期:2018-01-25
  • 录用日期:2017-11-13
  • 在线发布日期: 2018-02-23
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