p(MESH:Proteins, pmod(Ub))
Thus, Rad23 and Dsk2 in yeast are believed to bind polyubiquitinated substrates in the cytosol and target them to the proteasome PubMed:14556719
Thus, Rad23 and Dsk2 in yeast are believed to bind polyubiquitinated substrates in the cytosol and target them to the proteasome PubMed:14556719
It has recently become appreciated that ubiquitination of proteins by covalent modification tags them for elimination not only through the proteasome (the ubiquitin–proteasome system or UPS) but also through the lysosomal system. PubMed:22908190
In APP transgenic mouse models of AD, undigested autophagy substrates including LC3-II, p62, and ubiquitinated proteins accumulate in neuronal AVs, establishing that autophagic protein turnover in lysosomes is impeded (Yang et al. 2011). PubMed:22908190
It has recently become appreciated that ubiquitination of proteins by covalent modification tags them for elimination not only through the proteasome (the ubiquitin–proteasome system or UPS) but also through the lysosomal system. PubMed:22908190
The proteasome selectively degrades normal proteins (mainly those with short half-lives) and abnormal proteins, which are earmarked for elimination by a process involving their conjugation to ubiquitin (Ub; Goldberg 2003). PubMed:22908190
Third, there is ligation of Ub with an epsilon-amino group of lysine in the target protein by an E3 ligase. E3 ligase binds both the target protein and the E2–Ub complex; thousands of substrate- specific E3s ensure selective protein tagging and degradation. PubMed:22908190
Third, there is ligation of Ub with an epsilon-amino group of lysine in the target protein by an E3 ligase. E3 ligase binds both the target protein and the E2–Ub complex; thousands of substrate- specific E3s ensure selective protein tagging and degradation. PubMed:22908190
Similar results have recently been observed in vitro using the proteasome inhibitor lactacystin, as pre-treatment with rapamycin attenuates lactacystin-induced apoptosis and reduces lactacystin-induced ubiquitinated protein aggregation [74]. PubMed:18930136
HDAC6 activity appears to be important for trafficking ubiquitinated proteins and lysosomes in vitro and this has led to the suggestion that HDAC6 coordinates delivery of substrates to autophagic machinery [64,70,78]. PubMed:18930136
Thus, it has been suggested that p62 provides a key link between autophagy and the UPS by facilitating autophagic degradation of ubiquitinated proteins. PubMed:18930136
Third, there is ligation of Ub with an epsilon-amino group of lysine in the target protein by an E3 ligase. E3 ligase binds both the target protein and the E2–Ub complex; thousands of substrate- specific E3s ensure selective protein tagging and degradation. PubMed:22908190
Ubiquitinated target proteins bind to the 19S cap (RP), which has a Ub binding site and ATPase activity, and this leads to cleavage of Ub moieties from the target by deubiquitinating enzymes, unfolds the polypeptides and sends them to the narrow channel of the 20S core particle. PubMed:22908190
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If you find BEL Commons useful in your work, please consider citing: Hoyt, C. T., Domingo-Fernández, D., & Hofmann-Apitius, M. (2018). BEL Commons: an environment for exploration and analysis of networks encoded in Biological Expression Language. Database, 2018(3), 1–11.