DCAF4 (DDB1 And CUL4 Associated Factor 4) is a critical component of the CUL4-DDB1 ubiquitin ligase complex, which tags proteins for degradation via ubiquitination. This process is vital for regulating protein levels, maintaining cellular homeostasis, and managing stress responses. DCAF4 helps determine the proteins targeted, playing key roles in cell cycle regulation, DNA repair, and signal transduction. Disruptions in DCAF4 function can cause cellular imbalances and have been linked to cancer and other diseases, highlighting its significance in proteostasis and cellular health.