The ubiquitin-proteasome pathway

Annals of Medicine
Pia Roos-Mattjus, Lea Sistonen

Abstract

Regulating protein stability and turnover is a key task in the cell. Besides lysosomes, ubiquitin-mediated proteasomal degradation comprises the major proteolytic pathway in eukaryotes. Proteins destined for degradation by the proteasome are conjugated by a 'tag', a ubiquitin chain to a lysine, through an extensively regulated enzymatic cascade. The ubiquitylated proteins are subsequently targeted for degradation by the 26S proteasome, the major proteolytic machinery for ubiquitylated proteins in the cell. Ubiquitylation can be considered as another covalent post-translational modification and signal, comparable to acetylation, glycosylation, methylation, and phosphorylation. However, ubiquitylation has multiple roles in addition to targeting proteins for degradation. Depending on the number of ubiquitin moieties and the linkages made, ubiquitin also plays an important role in DNA repair, protein sorting and virus budding. Unregulated degradation of proteins, or abnormally stable proteins, interfere with several regulatory pathways, and the ubiquitin-proteasome pathway is affected in a number of diseases, such as neurodegenerative diseases, cellular atrophies and malignancies. Therefore, dissecting the ubiquitin-proteasome path...Continue Reading

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