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.
Also known as ARMADILLO BTB ARABIDOPSIS PROTEIN 1 (ABAP1). Encodes a novel Armadillo BTB protein that intreacts with the pre-replication complex and several transcription factors. Overexpression results in decreased cell proliferation and loss of function results in increased cell proliferation suggesting a role in negative regulation of cellular proliferation.