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). In association with TCP24, exerts a negative role in cell proliferation in leaves, possibly by inhibiting mitotic DNA replication. Protein modification; protein ubiquitination. Forms a heterodimeric complex with TCP24 (PubMed:18818695). Interacts with the origin recognition complex (preRC) components ORC1A, ORC1B, CDT1A and CDT1B (PubMed:18818695). Interacts with DUF7/AIP1 (PubMed:26538092). Weakly expressed in the emerging lateral roots and mainly expressed in the shoot apex, young leaves and flower buds. Detected in developing leaves during proliferation stage (9-day-old plants) and expression rapidly declines in leaves of 13 till 21-day-old plants. Also expressed during stomatal cell differentiation. The BTB/POZ domain mediates the interaction with some component of ubiquitin ligase complexes.