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| Content Provider | PubMed Central |
|---|---|
| Author | Ponting, C. P. |
| Abstract | Sequence database searches, using iterative-profile and Hidden-Markov-model approaches, were used to detect hitherto-undetected homologues of proteins that regulate the endoplasmic reticulum (ER)-associated degradation pathway. The translocon-associated subunit Sec63p (Sec=secretory) was shown to contain a domain of unknown function found twice in several Brr2p-like RNA helicases (Brr2=bad response to refrigeration 2). Additionally, Cue1p (Cue=coupling of ubiquitin conjugation to ER degradation), a yeast protein that recruits the ubiquitin-conjugating (UBC) enzyme Ubc7p to an ER-associated complex, was found to be one of a large family of putative scaffolding-domain-containing proteins that include the autocrine motility factor receptor and fungal Vps9p (Vps=vacuolar protein sorting). Two other yeast translocon-associated molecules, Sec72p and Hrd3p (Hrd=3-hydroxy-3-methylglutaryl-CoA reductase degradation), were shown to contain multiple tetratricopeptide-repeat-like sequences. From this observation it is suggested that Sec72p associates with a heat-shock protein, Hsp70, in a manner analogous to that known for Hop (Hsp70/Hsp90 organizing protein). Finally, the luminal portion of Ire1p (Ire=high inositol-requiring), thought to convey the sensing function of this transmembrane kinase and endoribonuclease, was shown to contain repeats similar to those in beta-propeller proteins. This finding hints at the mechanism by which Ire1p may sense extended unfolded proteins at the expense of compact folded molecules. |
| Starting Page | 527 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 2 |
| Volume Number | 351 |
| Language | English |
| Publisher Date | 2000-10-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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