The Basic Helix-Loop-Helix Transcription Factor MYC1 Is Involved in the Regulation of the Flavonoid Biosynthesis Pathway in Grapevine

被引:317
作者
Hichri, Imene [2 ]
Heppel, Simon C. [1 ]
Pillet, Jeremy [2 ]
Leon, Celine [2 ]
Czemmel, Stefan [1 ]
Delrot, Serge [2 ]
Lauvergeat, Virginie [2 ]
Bogs, Jochen [1 ]
机构
[1] Heidelberger Inst Pflanzenwissensch, D-69120 Heidelberg, Germany
[2] Univ Bordeaux, UMR Ecophysiol & Genom Fonctionnelle Vigne 1287, INRA, Inst Sci Vigne & Vin, F-33882 Villenave Dornon, France
关键词
Fruit ripening; molecular physiology; secondary metabolism-phenylpropanoids and phenolics; gene regulation; transcriptional control and transcription factors; grapevine; PROANTHOCYANIDIN BIOSYNTHESIS; ANTHOCYANIN BIOSYNTHESIS; MYB DOMAIN; LEUCOANTHOCYANIDIN REDUCTASE; PETUNIA ENCODES; GENE ENCODES; ARABIDOPSIS; EXPRESSION; PROTEIN; BHLH;
D O I
10.1093/mp/ssp118
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Previous results indicated that in grapevine (Vitis vinifera), regulation of the flavonoid pathway genes by MYB transcription factors depends on their interaction with basic helix-loop-helix proteins (bHLHs). The present study describes the first functional characterization of a bHLH factor from grapevine named VvMYC1. This transcription factor is phylogenetically related to Arabidopsis bHLH proteins, which participate in the control of flavonoid biosynthesis and epidermal cell fate. Transient promoter and yeast two-hybrid assays demonstrated that VvMYC1 physically interacts with MYB5a, MYB5b, MYBA1/A2, and MYBPA1 to induce promoters of flavonoid pathway genes involved in anthocyanin and/or proanthocyanidin (PA) synthesis. Additionally, transient promoter assays revealed that VvMYC1 is involved in feedback regulation of its own expression. Transcript levels of VvMYC1 during berry development correlate with the synthesis of anthocyanins and PAs in skins and seeds of berries, suggesting that VvMYC1 is involved in the regulation of anthocyanins and PA synthesis in these organs. Likewise, transient expression of VvMYC1 and VvMYBA1 induces anthocyanin synthesis in grapevine suspension cells. These results suggest that VvMYC1 is part of the transcriptional cascade controlling anthocyanin and PA biosynthesis in grapevine.
引用
收藏
页码:509 / 523
页数:15
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