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. Plays a key role as a component of the TAC1-mediated telomerase activation pathway certainly by targeting a telomerase repressor to degradation. Seems to occupy an integral position in a complex signaling network that perceives, integrates, and responds to multiple, and sometimes competing, signals. Enhances responses to auxin in postgermination and vegetative development. Also negatively regulates ABA- and sugar-mediated inhibition of the germination. Essential for female and male gametophyte development. Protein modification; protein ubiquitination. Interacts with CUL3A. Interacts with GTE11/BET10 through the BTB domain. Preferentially expressed in young leaves and roots. Up-regulated by auxin (IAA), methyl jasmonate (MeJA), hydrogen peroxide and nitrates. Down-regulated by salicylic acid (SA), abscisic acid (ABA), hydrogen peroxide, sugars, cold and NaCl. Positively regulated by the transcriptional factor TAC1. Circadian-regulation; expression increase during the dark phase and decrease during the light phase. The BTB/POZ domain mediates the interaction with some component of ubiquitin ligase complexes. Altered response to auxin. Blocked ability of TAC1 to induce telomerase. Hypersensitive response to both sugar and abscisic acid (ABA)-mediated inhibition of germination.