May function as the substrate recognition module for a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex including DDB1A and CUL4 (By similarity). Required for DNA repair. Binds to DDB1A to form the UV-damaged DNA-binding protein complex (the UV-DDB complex). The UV-DDB complex may recognize UV-induced DNA damage and recruit proteins of the nucleotide excision repair pathway (the NER pathway) to initiate DNA repair (PubMed:18551167). Involved in UV-B tolerance and genome integrity. In association with ATCSA-1, is necessary for repair of UV-B-induced DNA lesions (PubMed:20128879). Protein modification; protein ubiquitination. Component of the UV-DDB complex, which is composed of DDB1A and DDB2. Interacts with CUL4. Broadly distributed over chromatin. Expressed in roots and flowers. Expressed at low levels in stems. Induced transiently by UV-B. The DWD box is required for interaction with DDB1A. Interblade loops of the WD repeat region mediate most of the interaction with DNA. A hairpin between blades 5 and 6 inserts into DNA minor groove and mediates recognition of lesions and separation of the damaged and undamaged strands (By similarity). Belongs to the WD repeat DDB2/WDR76 family. Although the DWD box motif has been suggested to mediate interaction of DDB2 with DDB1A, mutagenesis experiments have to date failed to demonstrate a role for this motif.