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 (By similarity). Acts as a positive regulator of ABA response via the modulation of the transcriptional activity of ABF2, a transcription factor which controls ABA-dependent gene expression via the G-box-type ABA-responsive elements. Negative regulator of seed germination and young seedling growth. Protein modification; protein ubiquitination. Interacts with ABF2 (PubMed:15516505). Interacts with DUF7/AIP1 (PubMed:26538092). A number of isoforms are produced. According to EST sequences. Detected in embryos and most of the vegetative and reproductive organs. Up-regulated by abscisic acid (ABA) and high salt. The BTB/POZ domain mediates the interaction with some component of ubiquitin ligase complexes. Abscisic acid (ABA) and glucose insensitivities. More efficient germination and postgermination growth.