E-viri
Recenzirano
Odprti dostop
-
Mass Spectrometry Reveals the Missing Links in the Assembly Pathway of the Bacterial 20 S ProteasomeSharon, Michal; Witt, Susanne; Glasmacher, Elke; Baumeister, Wolfgang; Robinson, Carol V.
Journal of biological chemistry/The Journal of biological chemistry, 06/2007, Letnik: 282, Številka: 25Journal Article
The 20 S proteasome is an essential proteolytic particle, responsible for degrading short-lived and abnormal intracellular proteins. The 700-kDa assembly is comprised of 14 α-type and 14 β-type subunits, which form a cylindrical architecture composed of four stacked heptameric rings (α7β7β7α7). The formation of the 20 S proteasome is a complex process that involves a cascade of folding, assembly, and processing events. To date, the understanding of the assembly pathway is incomplete due to the experimental challenges of capturing short-lived intermediates. In this study, we have applied a real-time mass spectrometry approach to capture transient species along the assembly pathway of the 20 S proteasome from Rhodococcus erythropolis. In the course of assembly, we observed formation of an early α/β-heterodimer as well as an unprocessed half-proteasome particle. Formation of mature holoproteasomes occurred in concert with the disappearance of half-proteasomes. We also analyzed the β-subunits before and during assembly and reveal that those with longer propeptides are incorporated into half- and full proteasomes more rapidly than those that are heavily truncated. To characterize the preholoproteasome, formed by docking of two unprocessed half-proteasomes and not observed during assembly of wild type subunits, we trapped this intermediate using a β-subunit mutational variant. In summary, this study provides evidence for transient intermediates in the assembly pathway and reveals detailed insight into the cleavage sites of the propeptide.
Vnos na polico
Trajna povezava
- URL:
Faktor vpliva
Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
---|
Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
---|
Vir: Osebne bibliografije
in: SICRIS
To gradivo vam je dostopno v celotnem besedilu. Če kljub temu želite naročiti gradivo, kliknite gumb Nadaljuj.