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IRE1α is an endogenous substrate of endoplasmic-reticulum-associated degradation

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Overview

authors

  • Sun, S.
  • Shi, G.
  • Sha, H.
  • Ji, Y.
  • Han, X.
  • Shu, X.
  • Ma, H.
  • Inoue, T.
  • Gao, B.
  • Kim, H.
  • Bu, P.
  • Guber, R. D.
  • Shen, X.
  • Lee, A. H.
  • Iwawaki, T.
  • Paton, A. W.
  • Paton, J. C.
  • Fang, D.
  • Tsai, B.
  • Yates III, John
  • Wu, H.
  • Kersten, S.
  • Long, Q.
  • Duhamel, G. E.
  • Simpson, K. W.
  • Qi, L.

publication date

  • December 2015

journal

  • Nature Cell Biology  Journal

abstract

  • Endoplasmic reticulum (ER)-associated degradation (ERAD) represents a principle quality control mechanism to clear misfolded proteins in the ER; however, its physiological significance and the nature of endogenous ERAD substrates remain largely unexplored. Here we discover that IRE1?, the sensor of the unfolded protein response (UPR), is a bona fide substrate of the Sel1L-Hrd1 ERAD complex. ERAD-mediated IRE1? degradation occurs under basal conditions in a BiP-dependent manner, requires both the intramembrane hydrophilic residues of IRE1? and the lectin protein OS9, and is attenuated by ER stress. ERAD deficiency causes IRE1? protein stabilization, accumulation and mild activation both in vitro and in vivo. Although enterocyte-specific Sel1L-knockout mice (Sel1L(?IEC)) are viable and seem normal, they are highly susceptible to experimental colitis and inflammation-associated dysbiosis, in an IRE1?-dependent but CHOP-independent manner. Hence, Sel1L-Hrd1 ERAD serves a distinct, essential function in restraint of IRE1? signalling in vivo by managing its protein turnover.
  • Endoplasmic reticulum (ER)-associated degradation (ERAD) represents a principle quality control mechanism to clear misfolded proteins in the ER; however, its physiological significance and the nature of endogenous ERAD substrates remain largely unexplored. Here we discover that IRE1α, the sensor of the unfolded protein response (UPR), is a bona fide substrate of the Sel1L-Hrd1 ERAD complex. ERAD-mediated IRE1α degradation occurs under basal conditions in a BiP-dependent manner, requires both the intramembrane hydrophilic residues of IRE1α and the lectin protein OS9, and is attenuated by ER stress. ERAD deficiency causes IRE1α protein stabilization, accumulation and mild activation both in vitro and in vivo. Although enterocyte-specific Sel1L-knockout mice (Sel1L(ΔIEC)) are viable and seem normal, they are highly susceptible to experimental colitis and inflammation-associated dysbiosis, in an IRE1α-dependent but CHOP-independent manner. Hence, Sel1L-Hrd1 ERAD serves a distinct, essential function in restraint of IRE1α signalling in vivo by managing its protein turnover.

subject areas

  • Animals
  • Base Sequence
  • Blotting, Western
  • Cells, Cultured
  • Endoplasmic Reticulum
  • Endoplasmic Reticulum-Associated Degradation
  • Endoribonucleases
  • Enterocytes
  • Female
  • Gene Expression Profiling
  • HEK293 Cells
  • Heat-Shock Proteins
  • Humans
  • Lectins
  • Male
  • Mice
  • Mice, Knockout
  • Mice, Transgenic
  • Neoplasm Proteins
  • Oligonucleotide Array Sequence Analysis
  • Protein-Serine-Threonine Kinases
  • Proteins
  • Reverse Transcriptase Polymerase Chain Reaction
  • Ubiquitin-Protein Ligases
  • Unfolded Protein Response
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Identity

PubMed Central ID

  • PMC4670240

International Standard Serial Number (ISSN)

  • 1465-7392

Digital Object Identifier (DOI)

  • 10.1038/ncb3266

PubMed ID

  • 26551274
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Additional Document Info

start page

  • 1546

end page

  • 1555

volume

  • 17

issue

  • 12

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