May act as a substrate-specific adapter of an E3 ubiquitin-protein ligase complex (CUL3-RBX1-BTB) which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. Protein modification; protein ubiquitination. Interacts with GTE11/BET10 through the BTB domain. Preferentially expressed in leaves, stems and flowers. Up-regulated by auxin (IAA), salicylic acid (SA), methyl jasmonate (MeJA), hydrogen peroxide, wounding and NaCl. The BTB/POZ domain mediates the interaction with some component of ubiquitin ligase complexes. May be due to an intron retention.