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园艺学报 ›› 2006, Vol. 33 ›› Issue (1): 84-88.

• 研究论文 • 上一篇    下一篇

潍坊萝卜中芜菁花叶病毒分离物的分子特性及CP基因的表达

刘金亮;于晓庆;田延平;都 杰;竺晓平;李向东;严敦余   

  1. (山东农业大学植物保护学院, 泰安271018)
  • 收稿日期:2005-04-06 修回日期:2005-06-17 出版日期:2006-02-25 发布日期:2006-02-25

Molecular Characterization and Coat Protein Gene Expression of a Turnip mosaic virus Isolate from Radish in Weifang

  • Received:2005-04-06 Revised:2005-06-17 Online:2006-02-25 Published:2006-02-25

摘要: 从表现红心病的潍坊萝卜块根上得到一芜菁花叶病毒( Turnip m osaic virus, TuMV) 分离物
(TuMV-Ra) , 通过RT-PCR获得了该分离物的外壳蛋白(CP) 基因, 对其进行了序列测定, 并将其核苷酸序列及推导出的氨基酸序列与GenBank中登录的其它20个TuMV萝卜分离物的相应序列进行比较和分析。结果表明, TuMV-Ra与这20个分离物CP基因核苷酸序列的同源性为89.9% ~99.0% , CP氨基酸序列同源性为94.8%~99.7%; 其中与中国浙江杭州萝卜的两个分离物HZLB1、HZLB2同源性最高, 核苷酸序列的同源性为98.7%和99.0% , 氨基酸序列同源性为99.0%和99.7%。TuMV-Ra与1999年从表现相同症状的潍坊萝卜得到的分离物CHINA-WF CP基因核苷酸同源性为93.66% , 氨基酸同源性为96.53% , 说明病毒发生了比较大的变异, 而且变异的位点主要在CP的N末端。将TuMV-Ra CP基因克隆到原核表达载体pET-22b ( + ) , 在大肠杆菌BL21 (DE3) 中表达出分子量为38 kD的融合蛋白。Western blotting分析证明TuMV-Ra CP在大肠杆菌中得到了正确表达。

关键词: 芜菁花叶病毒, 萝卜, CP基因, 分子特性, 基因表达

Abstract: A Turnip mosaic virus (TuMV) isolate (TuMV-Ra) was obtained from the radish root with symptom of red flesh in Weifang. The coat protein (CP) gene of TuMV-Ra was amplified by RT-PCR and its complete nucleotide sequence was determined. Homologies of the nucleotide and deduced amino acid sequences were compared between the CP region of TuMV-Ra and those of 20 TuMV radish isolates in GenBank. TuMV-Ra shared identities of 89.9% - 99.0% and 94.8% - 99.7% with these 20 radish isolates in nucleotide and corresponding amino acid sequences. It had highest homologies with two isolates from Hangzhou, HZLB1 and HZLB2, which amounted to 98.7% and 99.0% at nucleotide level and 99.0% and 99.7% at amino acid level. The nucleotide and amino acid sequences similarities between TuMV-Ra and CHINA-WF (obtained from the red flesh radish of Weifang in 1999) were 93.66% and 96.53% respectively. Most of the mutations occurred at the N terminus of CP. The CP gene of TuMV-Ra was cloned into expression vector pET22b ( + ) , transferred into E. coli BL21 (DE3) and exp ressed as a 38 kD fusion protein when induced with IPTG. The result ofwestern blotting assay showed that TuMV-Ra CP gene had been correctly expressed.

Key words: Turnip m osa ic virus, Radish, CP gene, Molecular characterization, Gene exp ression