Required for DNA repair. Binds to DDB1 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 (Probable). May function as the substrate recognition module for a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex (By similarity). Component of the UV-DDB complex, which is composed of DDB1 and DDB2. Expressed in proliferating tissues such as shoot apical meristem (SAM), root tips and young leaves. Not detected in mature leaves. Belongs to the WD repeat DDB2/WDR76 family.