| 2000 |
HEDJ/DNAJB11 is a luminal, membrane-associated ER-resident Hsp40 co-chaperone whose J domain interacts with the ER-associated Hsp70 BiP in an ATP-dependent manner and stimulates BiP's ATPase activity in vitro. |
Confocal microscopy for ER localization; protease susceptibility, glycosidase treatment, detergent solubility assays for luminal orientation; in vitro ATPase stimulation assay |
The Journal of biological chemistry |
High |
10827079
|
| 2004 |
ERdj3 directly binds unfolded protein substrates (unassembled Ig heavy chains, unfolded light chains, VSV-G ts045 mutant) independently of BiP; an ERdj3 mutant unable to stimulate BiP's ATPase activity in vitro or bind BiP in vivo retains substrate binding, indicating ERdj3 contacts substrates directly rather than via BiP. ERdj3 binds substrates first and dissociates before folding is complete, whereas BiP remains bound longer, supporting a model where ERdj3 inhibits aggregation until BiP joins and then BiP-interaction triggers ERdj3 release. |
In vitro ATPase stimulation assay; co-immunoprecipitation; ERdj3 ATPase-stimulation-dead mutant; pulse-chase kinetics |
Molecular biology of the cell |
High |
15525676
|
| 2004 |
ERdj3 is moderately induced by ER stressors; siRNA-mediated reduction of ERdj3 decreases ER stress tolerance in neuroblastoma cells, while overexpression of ERdj3 suppresses vero toxin-induced cell death. |
siRNA knockdown; ERdj3 overexpression by gene transfection; cell viability assays |
Cell stress & chaperones |
Medium |
15544163
|
| 2005 |
Within the ER lumen, Shiga toxin interacts with HEDJ/ERdj3 and is found in a complex containing HEDJ and the translocon Sec61, suggesting ERdj3 participates in retrotranslocation of Shiga toxin from the ER to the cytosol. |
Sequential co-immunoprecipitation; confocal microscopy; genetic screen yielding dominant-negative HEDJ truncation |
Infection and immunity |
Medium |
15784599
|
| 2007 |
XBP-1(S) directly binds the ERdj3 promoter in plasmacytoma cells and LPS-stimulated primary B cells, establishing ERdj3 as a direct transcriptional target of XBP-1(S) during plasma cell differentiation and the UPR. |
Chromatin immunoprecipitation (ChIP); shRNA-mediated XBP-1 knockdown; gel shift (EMSA) |
Journal of immunology |
High |
17709512
|
| 2008 |
Release of ERdj3 from unfolded substrates requires a functional interaction with BiP including both direct physical contact and the ability to stimulate BiP's ATPase activity; BiP mutants defective at any step of the ATPase cycle fail to release ERdj3 from substrate, demonstrating ATP hydrolysis by BiP is mechanistically required for ERdj3 dissociation. |
ERdj3 and BiP interaction-disrupting mutants; BiP ATPase cycle mutants; co-immunoprecipitation; in vitro release assays |
The EMBO journal |
High |
18923428
|
| 2009 |
ERdj3 binds unfolded substrates directly via conserved residues in domain I (homologous to peptide-binding site of yeast Ydj1) and domain II; domain II is critical for substrate binding and is not present in type II DnaJ family members. ERdj3 forms multimers in cells and the conserved C-terminal phenylalanine 326 is critical for self-assembly; mutation of F326A diminishes substrate binding, indicating multimerization is required for full substrate binding activity. |
Site-directed mutagenesis of conserved residues; in vitro and in vivo substrate binding assays; secondary structure prediction guided by Ydj1 crystal structure |
Biochemistry |
High |
19090675
|
| 2010 |
The Salmonella T3SS effector SlrP targets ERdj3 domain II for interaction; SlrP co-localizes partially to the ER and interferes with ERdj3 binding to a denatured substrate, demonstrating SlrP modulates ERdj3 chaperone function in the ER. |
Co-immunoprecipitation with truncated ERdj3 constructs; confocal microscopy; subcellular fractionation; substrate binding competition assay |
The Journal of biological chemistry |
Medium |
20335166
|
| 2010 |
ERdj3/DNAJB11 is a cellular binding partner and co-chaperone required for expression of the KSHV K1 oncoprotein; siRNA knockdown of ERdj3 dramatically reduces K1 protein levels and abolishes K1's anti-apoptotic function, identifying K1 as an ERdj3 client protein. |
Tandem affinity purification; bidirectional co-immunoprecipitation; siRNA knockdown; apoptosis assays |
Oncogene |
Medium |
20418907
|
| 2011 |
ERdj3 directly binds unfolded (but not folded) cholera toxin CTA1 subunit via its A1(2) subdomain, masking solvent-exposed hydrophobic residues; expression of dominant-negative ERdj3 blocks CTA1 translocation into the cytosol, establishing ERdj3 as a host factor required for CT intoxication. |
Surface plasmon resonance binding assay; dominant-negative ERdj3 overexpression; cell-based translocation assay |
Infection and immunity |
Medium |
21844235
|
| 2013 |
ERdj3 associates with a large complex including the translocon Sec61α in the ER; FRAP analysis shows overexpressed ERdj3 dramatically decreases BiP mobility in a client-dependent manner, while ERdj3 itself remains relatively immobile regardless of client levels, demonstrating ERdj3 regulates BiP engagement of client proteins and likely acts in ER subdomains enriched near the translocon. |
FRAP live-cell imaging; native gel electrophoresis; co-immunoprecipitation |
Journal of cell science |
Medium |
23378021
|
| 2014 |
ERdj3 homodimers that cannot stimulate BiP ATPase (QPD mutants) accumulate on unfolded ER substrates due to impaired release rather than enhanced binding; dimerization is strictly required for substrate binding; heterodimers with one functional subunit show wild-type release rates, demonstrating only one protomer needs to stimulate BiP ATPase for ERdj3 release. |
QPD mutant co-expression; pulse-chase experiments; co-immunoprecipitation; heterodimer analysis |
The Journal of biological chemistry |
High |
25143379
|
| 2014 |
ERdj3 promotes ERAD of mutant GCase (Gaucher's disease variants); depleting ERdj3 reduces mutant GCase degradation rate and redirects it to the calnexin pro-folding pathway, increasing GCase trafficking and lysosomal function. |
GCase immunoprecipitation followed by mass-spectrometry proteomics; siRNA ERdj3 depletion in patient-derived fibroblasts; GCase trafficking and activity assays |
Chemistry & biology |
Medium |
25126989
|
| 2014 |
UPR activation upregulates and triggers secretion of ERdj3 into the extracellular space; secreted ERdj3 binds misfolded extracellular proteins, substoichiometrically inhibits their aggregation, and attenuates proteotoxicity of misfolded prion protein. ERdj3 can co-secrete with destabilized aggregation-prone clients as a stable complex when ER chaperoning is overwhelmed. |
ERdj3 secretion assays under UPR activation; co-secretion co-immunoprecipitation; aggregation inhibition assays; proteotoxicity cell-based assays |
The EMBO journal |
High |
25361606
|
| 2017 |
ERdj3 promotes ERAD of Z-variant alpha-1-antitrypsin (ZAAT); depleting ERdj3 increases ZAAT degradation rate by redirecting ZAAT to the calreticulin-EDEM1 pathway followed by autophagosome formation. |
Co-immunoprecipitation; siRNA ERdj3 knockdown in hepatocytes; degradation rate assays; pathway marker analysis |
Journal of cellular biochemistry |
Medium |
28419579
|
| 2017 |
ERdj3/DNAJB11 assembles as a native tetramer (dimer of dimers) rather than the dimer typical of other HSP40 co-chaperones; an EM structural model shows the tetramer involves inter-subunit interactions via domain II and domain III. Deletion of residues 175–190 within domain II renders ERdj3 a stable dimer with impaired substrate binding in the ER and extracellular space, reduced BiP interactions, and worsened ER stress-dependent client secretion and extracellular aggregation. |
Electron microscopy structural modeling; targeted domain deletion mutagenesis; co-immunoprecipitation; secretion and aggregation assays |
The EMBO journal |
High |
28655754
|
| 2018 |
DNAJB11 loss impairs maturation and trafficking of the ADPKD protein polycystin-1 (PC1) and the ADTKD protein uromodulin (UMOD), establishing DNAJB11 as an ER co-chaperone required for processing of these disease-relevant clients. |
Characterization of DNAJB11-null cells; analysis of kidney samples from affected individuals; biochemical trafficking and maturation assays |
American journal of human genetics |
Medium |
29706351
|
| 2019 |
SDF2L1 retains ERdj3 in the ER by forming a complex with ERdj3 and SDF2; the ERdj3 dimer incorporates two SDF2L1 molecules to form the ER-retained complex, whereas ERdj3 alone forms a homotetramer. The ERdj3–SDF2L1 complex shows higher chaperone activity than ERdj3 alone (suppressing ER protein aggregation without requiring substrate transfer to BiP) and maintains denatured GST in a soluble oligomeric state in vitro. |
Co-immunoprecipitation; in vitro aggregation suppression assay with denatured GST; intracellular localization analysis; in vitro reconstitution of ERdj3–SDF2L1 complex |
The Journal of biological chemistry |
High |
31624144
|
| 2023 |
Dnajb11 loss in mice causes a profound defect in PC1 GPS cleavage with no effect on other cystoprotein processing assayed; conditional Dnajb11 loss in renal tubular epithelium produces PC1 dosage-dependent kidney cysts; Dnajb11 mouse models show no UPR activation or cyst-independent fibrosis, placing DNAJB11-kidney disease on the ADPKD spectrum via a PC1-dependent mechanism distinct from ADTKD pathogenesis. |
Germline and conditional mouse knockout alleles; Dnajb11-/- cell lines; PC1 C-terminal fragment cleavage assay; UPR activation markers |
Journal of the American Society of Nephrology |
High |
37332102
|
| 2024 |
ATM kinase phosphorylates DNAJB11 at threonine 188 upon DNA double-strand breaks; this phosphorylation specifically facilitates delivery of misfolded α-synuclein (but not tau or transthyretin) to the HSP70 folding system, and loss of this response impairs neurite outgrowth. |
Large-scale proteomic analysis of ATM/ATR substrates; site-directed mutagenesis of T188; co-chaperone delivery assays; neurite outgrowth assay; correlation with transgenic PD mouse model and patient samples |
NAR molecular medicine |
Medium |
41256008
|
| 2024 |
BiP/ERdj3 act as mechanical foldases under force (e.g., during co-translational folding through cellular tunnels), transitioning to holdase function in the absence of force; this force-regulated behavior is opposite to their cytoplasmic homologs DnaK/DnaJ, which act as holdases under force. |
Single-molecule force spectroscopy assays; comparison with DnaK/DnaJ homologs |
Protein science |
Medium |
38864739
|
| 2024 |
Biallelic loss of Dnajb11 in mouse models causes cystic kidney disease and fibrosis; cysts originate predominantly from proximal tubules (distinct from classical ADPKD); impaired PC1 GPS cleavage is identified as the underlying molecular mechanism by proteomic analysis of Dnajb11- and Pkd1-deficient cells. |
Constitutive and conditional Dnajb11 knockout mouse models; Dnajb11-deficient renal epithelial cell lines; quantitative proteomics; PC1 cleavage assay |
FASEB journal |
High |
39530576
|
| 2025 |
SDF2 and SDF2L1 are essential co-factors of DNAJB11 for PC1 processing; unbiased interaction proteomics identifies SDF2/SDF2L1 as strong DNAJB11 interactors; knockout of SDF2 and SDF2L1 together impairs PC1 processing, phenocopying DNAJB11 loss; DNAJB11 and SDF2/SDF2L1 show reciprocal interdependence of protein abundance. |
Unbiased interaction proteomics (AP-MS); CRISPR/Cas9 knockout cell lines; PC1 processing assays; complementation re-expression experiments |
The Journal of biological chemistry |
High |
41109348
|
| 2025 |
The E3 ubiquitin ligase RFFL ubiquitinates DNAJB11 and promotes its degradation via the proteasomal pathway, identifying RFFL as a writer of ubiquitin on DNAJB11. |
Label-free quantitative mass spectrometry proteomics; CRISPR/Cas9 RFFL knockout; stable RFFL re-expression; in vivo ubiquitination assays |
Journal of proteome research |
Medium |
40568870
|