Soybean transcription factor GmMYBZ2 represses catharanthine biosynthesis in hairy roots of Catharanthus roseus

文献类型： 外文期刊

第一作者： Zhou, Mei-Liang

作者： Zhou, Mei-Liang;Shao, Ji-Rong;Zhou, Mei-Liang;Wu, Yan-Min;Tang, Yi-Xiong;Hou, Hong-Li;Zhu, Xue-Mei

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关键词： Catharanthine;Growth index;Hairy roots;Metabolic engineering;MYB transcription factor;Transcript profiling

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

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收录情况： SCI

摘要： Catharanthus roseus (L.) G. Don is a plant species known for its production of a variety of terpenoid indole alkaloids, many of which have pharmacological activities. Production of catharanthine in cell cultures or in hairy roots established by transformation with Agrobacterium rhizogenes is of interest because catharanthine can be chemically coupled to the abundant leaf alkaloid vindoline to form the valuable anticancer drug vinblastine. Here, we observed a high amount of catharanthine in hairy roots of C. roseus, established by infecting leaf explants with the A. rhizogenes >agropine-type A4 strain carrying plasmid pRi. T-DNA transfer from plasmid pRi into hairy roots was confirmed by PCR for the essential T-DNA genes rolA and rolB and the agropine synthesis gene ags. The results suggest that integration of T-DNA into the plant DNA plays a positive role on the catharanthine pathway in C. roseus hairy roots. Furthermore, co-transformation with the soybean transcription factor GmMYBZ2 indicated that GmMYBZ2 reduces the catharanthine production by alteration of expression of a number of genes linked to the pathway. Transcription levels of the zinc-finger transcription factor 1 gene ZCT1 were high, and the transcription levels of the anthranilate synthase gene ASα, the strictosidine synthase gene STR, and the key transcription factor gene octadecanoid-responsive Catharanthus APETALA2/ethylene response factor were low. In addition, GmMYBZ2 had a negative effect on the gene expression levels of A-type cyclin CYSA and B-type cyclin CYSB, which was correlated with a reduced growth rate of the hairy roots.

分类号： Q939.9

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