UBA2 plays a crucial role in the sumoylation process, which is essential for regulating various cellular functions. Sumoylation, unlike ubiquitination that primarily targets proteins for degradation, modifies proteins to influence stability, localization, and activity, thereby impacting processes such as nuclear transport and transcriptional regulation. UBA2, along with homolog AOS1, forms a heterodimer that activates SUMO-1, facilitating conjugation to target proteins, including key regulators like p53 and MDM2. This interaction maintains cellular homeostasis and responds to stress, making UBA2 a significant player in cellular signaling pathways.