Component of the CUL4-RBX1-DDB1-DWA1/DWA2 E3 ubiquitin-protein ligase complex that acts as negative regulator in abscisic acid (ABA) signaling. May function as the substrate recognition module within this complex leading to ABI5 degradation. Functionally redundant with DWA1. Protein modification; protein ubiquitination. Interacts with ABI5 and DDB1A and DWA1. Increased sensitivity to abscisic acid (ABA) and salt.