DCAF4 (DDB1 And CUL4 Associated Factor 4) is a key component of the CUL4-DDB1 ubiquitin ligase complex, which is responsible for tagging proteins for degradation through ubiquitination. This process is essential for regulating protein levels, maintaining cellular balance, and managing stress responses. DCAF4 helps determine which proteins are targeted, playing important roles in cell cycle control, DNA repair, and signal transduction. Disruptions in DCAF4 function can lead to cellular imbalances and have been associated with cancer and other diseases, underscoring its importance in proteostasis and cellular health.