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E3 ubiquitin ligase that recognizes sugar chainsYukiko Yoshida et al. Nature. 2002.
. 2002 Jul 25;418(6896):438-42. doi: 10.1038/nature00890. Authors Yukiko Yoshida 1 , Tomoki Chiba, Fuminori Tokunaga, Hiroshi Kawasaki, Kazuhiro Iwai, Toshiaki Suzuki, Yukishige Ito, Koji Matsuoka, Minoru Yoshida, Keiji Tanaka, Tadashi Tai AffiliationItem in Clipboard
AbstractN-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.
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