The apple WD40 protein MdTTG1 interacts with bHLH but not MYB proteins to regulate anthocyanin accumulation
文献类型: 外文期刊
第一作者: An, Xiu-Hong
作者: An, Xiu-Hong;Tian, Yi;Chen, Ke-Qin;Wang, Xiao-Fei;Hao, Yu-Jin;An, Xiu-Hong;Tian, Yi;Chen, Ke-Qin;Wang, Xiao-Fei;Hao, Yu-Jin;An, Xiu-Hong;Tian, Yi;Chen, Ke-Qin;Wang, Xiao-Fei;Hao, Yu-Jin;Tian, Yi
作者机构:
关键词: Apple;Anthocyanin biosynthesis;WD40 protein;Ectopic expression;Protein interaction
期刊名称:JOURNAL OF PLANT PHYSIOLOGY ( 影响因子:3.549; 五年影响因子:4.164 )
ISSN: 0176-1617
年卷期: 2012 年 169 卷 7 期
页码:
收录情况: SCI
摘要: The abundance of anthocyanins and proanthocyanins in apples is tightly regulated by three classes of regulatory factors, MYB, bHLH and WD40 proteins, only some of which have been previously identified. In this study, we identified an apple WD40 protein (MdTTG1) that promotes the accumulation of anthocyanins. The biosynthetic genes required downstream in the flavonoid pathway were up-regulated when MdTTG1 was over-expressed in Arabidopsis. Consistent with its role as a transcriptional regulator, an MdTTG1-GFP fusion protein was observed only in the nucleus. We assayed the expression patterns of this gene in different organs and found that they were positively correlated with anthocyanin accumulation in the apple. Yeast two-hybrid and bimolecular fluorescence complementation assays demonstrated that MdTTG1 interacted with bHLH transcription factors (TFs) but not MYB protein, whereas bHLH was known to interact with MYB in apples. However, based on a ChIP assay, MdTTG1 does not appear to bind to the promoter of the anthocyanin biosynthetic genes MdDFR and MdUFGT. Taken together, these results suggest that the apple WD40 protein MdTTG1 interacts with bHLH but not MYB proteins to regulate anthocyanin accumulation. (C) 2012 Elsevier GmbH. All rights reserved.
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