Polyubiquitin-B (UBB)

Polyubiquitin-B (UBB) is a precursor protein comprised of multiple tandem repeats of the ubiquitin sequence that is processed to yield ubiquitin monomers. Ubiquitin is a highly conserved, 76-amino acid protein that serves as a pivotal regulatory signal for post-translational modification. Through covalent attachment (usually at lysine residues), ubiquitin tags proteins for proteasomal degradation or alters their function, localization, or turnover. UBB has direct implications in protein quality control and cellular signaling and is increasingly recognized for its roles in cancer, neurodegenerative disorders, and immune diseases. Aberrant forms, such as UBB+1, accumulate pathologically in neurodegeneration. Therapeutic targeting of ubiquitin-proteasome components represents one of the most successful clinical oncology strategies but also brings notable risks due to the pathway's centrality to cellular viability[1][2][3].

Other names

Ubiquitin BUBBPolyubiquitin-BMGC8385FLJ25987HEL-S-50epididymis secretory protein Li 50

Inhibition of protein degradation (by blocking downstream proteasome activity in cells overloaded with polyubiquitin chains); Modulation of ubiquitin conjugation or removal (by targeting enzymes in this pathway)