ubiquitinációs
Ubiquitination is a post-translational modification process in which a small protein called ubiquitin is attached to a target protein. This attachment can occur as a single ubiquitin molecule (monoubiquitination) or as a chain of ubiquitin molecules (polyubiquitination). The process is catalyzed by a cascade of enzymes, including E1 ubiquitin-activating enzymes, E2 ubiquitin-conjugating enzymes, and E3 ubiquitin ligases, which provide specificity to the reaction.
The attachment of ubiquitin acts as a signal that can direct the fate of the target protein.
Other polyubiquitin chain linkages can mediate non-proteolytic functions, such as in signal transduction pathways, immune responses,