UBE4B (Ubiquitination Factor E4B) is a gene that encodes a protein involved in the ubiquitin-proteasome system, which helps regulate protein degradation and quality control in cells. It plays a key role in removing damaged or misfolded proteins, particularly in neurons. Disruption of UBE4B function has been linked to neurodegenerative diseases, highlighting its importance in cellular stress response and neurological health.