Apple MdMYB306-like inhibits anthocyanin synthesis by directly interacting with MdMYB17 and MdbHLH33
文献类型： 外文期刊
作者： Wang, Shuo 1 ; Zhang, Zhen 1 ; Li, Li-Xian 1 ; Wang, Hai-Bo 2 ; Zhou, Hui 3 ; Chen, Xue-Sen 1 ; Feng, Shou-Qian 1 ;
作者机构： 1.Shandong Agr Univ, Coll Hort Sci & Engn, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China
2.Shandong Inst Pomol, Tai An 271000, Shandong, Peoples R China
3.Anhui Acad Agr Sci, Inst Hort, Key Lab Genet Improvement & Ecophysiol Hort Crops, Hefei 230031, Peoples R China
关键词： apple; anthocyanin; MdMYB306-like; R2R3-MYB repressors; MdMYB17; MdbHLH33
期刊名称：PLANT JOURNAL （ 影响因子：6.486； 五年影响因子：7.666 ）
ISSN： 0960-7412
年卷期：
页码：
收录情况： SCI
摘要： Anthocyanin is one of the most important pigments and nutrients in fruits. Genes encoding R2R3-MYB transcription factors (TFs) are key to anthocyanin regulation. R2R3-MYB activators have been widely studied in the anthocyanin synthesis pathway. However, the mechanism by which R2R3-MYB repressors negatively regulate anthocyanin synthesis remains poorly understood. In the present study, we characterized a subfamily 1 R2R3-MYB anthocyanin repressor gene, MYB306-like, from apple (Malus x domestica) and demonstrated its significance in anthocyanin regulation. The MdMYB306-like protein activates the expression of an anthocyanin repressor gene, MdMYB17, and inhibits the expression of MdDFR (an anthocyanin structural gene) by directly binding to the corresponding promoters. The MdMYB306-like protein interacts with MdMYB17 and MdbHLH33 through its N-terminus. In addition, MdMYB306-like interacts with MdbHLH33 and MdMYB17 to enhance its regulatory activities on MdMYB17 and MdDFR, respectively. Our results revealed that the MdMYB306-like protein, in conjunction with MdMYB17 and MdbHLH33, forms a key regulatory module to fine-tune anthocyanin synthesis in apple.
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