ERdj4 protein is a soluble endoplasmic reticulum (ER) DnaJ family protein that interacts with ER-associated degradation machinery

Chunwei Walter Lai, Joel H. Oteros, Linda M. Hendershots, Erik Snapp

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Protein localization within cells regulates accessibility for interactions with co-factors and substrates. The endoplasmic reticulum (ER) BiP co-factor ERdj4 is up-regulated by ER stress and has been implicated in ER-associated degradation (ERAD) of multiple unfolded secretory proteins. Several other ERdj family members tend to interact selectively with nascent proteins, presumably because those ERdj proteins associate with the Sec61 translocon that facilitates entry of nascent proteins into the ER.HowERdj4 selects and targets terminally misfolded proteins for destruction remains poorly understood. In this study, we determined properties of ERdj4 that might aid in this function. ERdj4 was reported to retain its signal sequence and to be resistant to mild detergent extraction, suggesting that it was an integral membrane protein. However, live cell photobleaching analyses of GFP-tagged ERdj4 revealed that the protein exhibits diffusion coefficients uncommonly high for an ER integral membrane protein and more similar to the mobility of a soluble luminal protein. Biochemical characterization established that the ERdj4 signal sequence is cleaved to yield a soluble protein. Importantly, we found that both endogenous and overexpressed ERdj4 associate with the integral membrane protein, Derlin-1. Our findings now directly link ERdj4 to the ERAD machinery and suggest a model in which ERjd4 could help recruit clients from throughout the ER to ERAD sites.

Original languageEnglish (US)
Pages (from-to)7969-7978
Number of pages10
JournalJournal of Biological Chemistry
Volume287
Issue number11
DOIs
StatePublished - Mar 9 2012

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HSP40 Heat-Shock Proteins
Endoplasmic Reticulum-Associated Degradation
Endoplasmic Reticulum
Machinery
Degradation
Proteins
Membrane Proteins
Protein Sorting Signals
Photobleaching
Protein Unfolding
Endoplasmic Reticulum Stress
Detergents

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

ERdj4 protein is a soluble endoplasmic reticulum (ER) DnaJ family protein that interacts with ER-associated degradation machinery. / Lai, Chunwei Walter; Oteros, Joel H.; Hendershots, Linda M.; Snapp, Erik.

In: Journal of Biological Chemistry, Vol. 287, No. 11, 09.03.2012, p. 7969-7978.

Research output: Contribution to journalArticle

Lai, Chunwei Walter ; Oteros, Joel H. ; Hendershots, Linda M. ; Snapp, Erik. / ERdj4 protein is a soluble endoplasmic reticulum (ER) DnaJ family protein that interacts with ER-associated degradation machinery. In: Journal of Biological Chemistry. 2012 ; Vol. 287, No. 11. pp. 7969-7978.
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