InterPro domain: IPR044714

This entry includes a group of BTB/POZ domain-containing protein, including At1g55760 (AtSIBP1) and At1g21780 from Arabidopsis. AtSIBP1 is induced by salt and other stresses and can positively regulate salt signalling [ 1 ]. The function of At1g21780 is not clear. Its BTB domain has been shown to interact with itself and with AtCUL3A. It might form an E3 ubiquitin ligase complex with RBX1 and AtCUL3A [ 2 ].

1. AtSIBP1, a Novel BTB Domain-Containing Protein, Positively Regulates Salt Signaling in Arabidopsis thaliana. Plants (Basel) 8
2. Arabidopsis has two redundant Cullin3 proteins that are essential for embryo development and that interact with RBX1 and BTB proteins to form multisubunit E3 ubiquitin ligase complexes in vivo. Plant Cell 17, 1180-95