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Tanaka, Keiji; Tai, Tadashi; Yoshida, Yukiko; Chiba, Tomoki; Tokunaga, Fuminori; Kawasaki, Hiroshi; Iwai, Kazuhiro; Suzuki, Toshiaki; Ito, Yukishige; Matsuoka, Koji; Yoshida, Minoru
Nature (London), 07/2002, Letnik: 418, Številka: 6896Journal Article
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 (SCFFbx2) 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 β1 is a target of Fbx2; these two proteins interact in the cytosol after inhibition of the proteasome. In addition, expression of the mutant Fbx2ΔF, 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 SCFFbx2 ubiquitinates N-glycosylated proteins that are translocated from the ER to the cytosol by the quality control mechanism.
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