USP8 Protein, Human (sf9)

USP8, a hydrolase with pivotal roles in cellular regulation, serves as a crucial player in protein turnover by effectively removing conjugated ubiquitin from proteins, preventing their degradation. This enzymatic action extends to both 'Lys-48' and 'Lys-63'-linked ubiquitin chains, showcasing its versatility in modulating ubiquitin dynamics. USP8's catalytic activity is notably enhanced during the M phase, underlining its cell cycle-dependent regulatory functions. The enzyme is intricately involved in various cellular processes, including cell proliferation and the response to serum stimulation, where it is required for S phase entry. Additionally, USP8 is implicated in the modulation of T-cell anergy, stabilization of proteins such as STAM2 and RASGRF1, and regulation of endosomal dynamics, cargo sorting, and membrane traffic. Its role in controlling ubiquitination on endosomes is essential for maintaining the organelle's morphology. USP8 further exerts influence on diverse pathways, including acrosome biogenesis, EGFR degradation, MAPK signaling, and the modulation of BACE1-mediated APP cleavage and amyloid-beta formation. The multifaceted functions of USP8 highlight its significance in maintaining cellular homeostasis and orchestrating various signaling cascades.