DCAF4 (DDB1 And CUL4 Associated Factor 4) is a crucial component of the CUL4-DDB1 ubiquitin ligase complex, which tags proteins for degradation through ubiquitination. This process is vital for regulating protein levels, maintaining cellular balance, and managing stress responses. DCAF4 helps select the proteins to be targeted, playing significant 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 importance in proteostasis and cellular health.