Transcription corepressor of Zinc finger transcription factors GAF1/IDD2 and ENY/IDD1 in regulation of gibberellin homeostasis and signaling. Tetramer (PubMed:26601214). Interacts with WUS (via the C-terminal domain) (PubMed:16461579). Interacts with SPL (via EAR motif) (PubMed:25527103, PubMed:25378179). Interacts with SPEAR3/TIE1 (PubMed:23444332). Binds to and corepresses GAF1/IDD2 at the promoter of GA20OX2 gene (PubMed:25035403). The N-terminal TOPLESS domain (TPD) (1-209) binds directly to a 12-amino acid LxLxL EAR motif peptide.