Substrate-specific adapter of a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex required for DNA replication during mitosis and meiosis. The DCX(DTL) complex, also named CRL4(CDT2) complex, mediates the polyubiquitination and subsequent degradation of cdt1 and spd1. Involved in the regulation of mitotic and pre-meiotic S-phase progression. Protein modification; protein ubiquitination. Component of the DCX(DTL) E3 ubiquitin ligase complex, at least composed of cul4, ddb1, cdt2 and pip1. Belongs to the WD repeat cdt2 family.