E3 ubiquitin ligase that recognizes sugar chains.

Abstract:

: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.

journal_name

Nature

journal_title

Nature

authors

Yoshida Y,Chiba T,Tokunaga F,Kawasaki H,Iwai K,Suzuki T,Ito Y,Matsuoka K,Yoshida M,Tanaka K,Tai T

doi

10.1038/nature00890

keywords:

subject

Has Abstract

pub_date

2002-07-25 00:00:00

pages

438-42

issue

6896

eissn

0028-0836

issn

1476-4687

pii

nature00890

journal_volume

418

pub_type

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