| First Author | Yoshida Y | Year | 2002 |
| Journal | Nature | Volume | 418 |
| Issue | 6896 | Pages | 438-42 |
| PubMed ID | 12140560 | Mgi Jnum | J:163142 |
| Mgi Id | MGI:4821082 | Doi | 10.1038/nature00890 |
| Citation | Yoshida Y, et al. (2002) E3 ubiquitin ligase that recognizes sugar chains. Nature 418(6896):438-42 |
| abstractText | N-glycosylation of proteins in the endoplasmic reticulum (ER) has a central role in protein quality control. Here we report that N-glycan serves as a signal for degradation by the Skp1-Cullin1-Fbx2-Roc1 (SCF(Fbx2)) ubiquitin ligase complex. The F-box protein Fbx2 (ref. 4) binds specifically to proteins attached to N-linked high-mannose oligosaccharides and subsequently contributes to ubiquitination of N-glycosylated proteins. Pre-integrin beta 1 is a target of Fbx2; these two proteins interact in the cytosol after inhibition of the proteasome. In addition, expression of the mutant Fbx2 Delta F, which lacks the F-box domain that is essential for forming the SCF complex, appreciably blocks degradation of typical substrates of the ER-associated degradation pathway. Our results indicate that SCF(Fbx2) ubiquitinates N-glycosylated proteins that are translocated from the ER to the cytosol by the quality control mechanism. |
