Ubiquitin is a small protein that plays a crucial role in the process of targeting other proteins for degradation by the proteasome. This process, known as ubiquitination, involves the covalent attachment of ubiquitin molecules to target proteins, marking them for destruction. Ubiquitin also plays a role in other cellular processes, such as protein trafficking, DNA repair, and cell signaling. Research in the field of ubiquitin focuses on understanding the mechanisms and regulation of ubiquitination, as well as its implications in various diseases such as cancer, neurodegenerative disorders, and immune system dysfunction. Overall, ubiquitin research is essential for advancing our understanding of cellular regulation and disease pathogenesis.