Transcription factor. Plays a role in resistance to amide-linked indole-3-acetic acid (IAA) conjugates such as IAA-Leu and IAA-Phe. May regulate gene expression in response to metal homeostasis changes. Homodimer (Probable). Interacts with BTS and BHLH47/PYE (PubMed:20675571, PubMed:25452667). Widely expressed throughout development, mostly in vasculatures. Plants are more sensitive to IAA conjugates.