Transcription activator, when associated with BHLH12/MYC1, EGL3, or GL3. Promotes the synthesis of. phenylpropanoid-derived compounds such as anthocyanins and proanthocyanidin, probably together with GL3 and BHLH2. Regulates the expression of CHS, DFRA, LDOX, and BAN. Interacts with BHLH12/MYC1, BHLH1/GL3/MYC6, BHLH2/EGL3/MYC146, and BHLH42/TT8. Mostly expressed in mature plant aerial part. Detected ubiquitously, with higher levels in rosette leaves and flowers. By jasmonic acid (JA), NaCl, sucrose, UV light, nitrogen deficiency and drought. This protein has reduced anthocyanins induction activity in cv C24 and cv cvi-1 backgrounds.