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template_file: templates/gene_research_go_focused.md
template_variables:
organism: mouse
gene_id: Dnajb11
gene_symbol: Dnajb11
uniprot_accession: Q99KV1
protein_description: 'RecName: Full=DnaJ homolog subfamily B member 11; AltName:
Full=APOBEC1-binding protein 2; Short=ABBP-2; AltName: Full=ER-associated DNAJ;
AltName: Full=ER-associated Hsp40 co-chaperone; AltName: Full=Endoplasmic reticulum
DNA J domain-containing protein 3; Short=ER-resident protein ERdj3; Short=ERdj3;
Short=ERj3p; Flags: Precursor;'
gene_info: Name=Dnajb11;
organism_full: Mus musculus (Mouse).
protein_family: Not specified in UniProt
protein_domains: DnaJ-B11-like. (IPR051736); DnaJ_C. (IPR002939); DnaJ_domain. (IPR001623);
DnaJ_domain_CS. (IPR018253); HSP40/DnaJ_pept-bd. (IPR008971)
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citation_count: 30

Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

• UniProt Accession: Q99KV1
• Protein Description: RecName: Full=DnaJ homolog subfamily B member 11; AltName: Full=APOBEC1-binding protein 2; Short=ABBP-2; AltName: Full=ER-associated DNAJ; AltName: Full=ER-associated Hsp40 co-chaperone; AltName: Full=Endoplasmic reticulum DNA J domain-containing protein 3; Short=ER-resident protein ERdj3; Short=ERdj3; Short=ERj3p; Flags: Precursor;
• Gene Information: Name=Dnajb11;
• Organism (full): Mus musculus (Mouse).
• Protein Family: Not specified in UniProt
• Key Domains: DnaJ-B11-like. (IPR051736); DnaJ_C. (IPR002939); DnaJ_domain. (IPR001623); DnaJ_domain_CS. (IPR018253); HSP40/DnaJ_pept-bd. (IPR008971)

MANDATORY VERIFICATION STEPS:

1. Check if the gene symbol "Dnajb11" matches the protein description above
2. Verify the organism is correct: Mus musculus (Mouse).
3. Check if protein family/domains align with what you find in literature
4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'Dnajb11' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene Dnajb11 (gene ID: Dnajb11, UniProt: Q99KV1) in mouse.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

• UniProt Accession: Q99KV1
• Protein Description: RecName: Full=DnaJ homolog subfamily B member 11; AltName: Full=APOBEC1-binding protein 2; Short=ABBP-2; AltName: Full=ER-associated DNAJ; AltName: Full=ER-associated Hsp40 co-chaperone; AltName: Full=Endoplasmic reticulum DNA J domain-containing protein 3; Short=ER-resident protein ERdj3; Short=ERdj3; Short=ERj3p; Flags: Precursor;
• Gene Information: Name=Dnajb11;
• Organism (full): Mus musculus (Mouse).
• Protein Family: Not specified in UniProt
• Key Domains: DnaJ-B11-like. (IPR051736); DnaJ_C. (IPR002939); DnaJ_domain. (IPR001623); DnaJ_domain_CS. (IPR018253); HSP40/DnaJ_pept-bd. (IPR008971)

MANDATORY VERIFICATION STEPS:

1. Check if the gene symbol "Dnajb11" matches the protein description above
2. Verify the organism is correct: Mus musculus (Mouse).
3. Check if protein family/domains align with what you find in literature
4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'Dnajb11' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene Dnajb11 (gene ID: Dnajb11, UniProt: Q99KV1) in mouse.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Research Report: Functional Annotation of Mouse Dnajb11 (DNAJB11/ERdj3; UniProt Q99KV1)

0) Target verification (mandatory)

The literature retrieved in this run consistently matches the user-specified UniProt entry Q99KV1 (Mus musculus Dnajb11) to the protein widely referred to as ERdj3/DNAJB11, a soluble ER-resident/luminal Hsp40 (J-domain protein) co-chaperone for BiP/HSPA5, with aliases including ABBP-2 and HEDJ. These sources describe a 358-aa protein with a cleavable N-terminal signal peptide, a canonical J-domain with the HPD motif, and no canonical KDEL retrieval motif—features that align with the UniProt description supplied by the user. (daverkausenfischer2024erresidentcochaperonesin pages 52-56, daverkausenfischer2024erresidentcochaperonesina pages 52-56, tungkum2023regulatingthetrafficking pages 35-39)

1) Key concepts and definitions (current understanding)

1.1 What DNAJB11/ERdj3 is

Dnajb11 (DNAJB11/ERdj3) encodes an endoplasmic reticulum (ER) J-domain (Hsp40/DnaJ) co-chaperone that partners with the ER Hsp70 chaperone BiP/HSPA5. The defining feature of J-domain proteins is the ~70-aa J-domain containing the conserved HPD motif, which is required to engage Hsp70s and stimulate their ATPase cycle, thereby controlling client binding/release dynamics. (abouelazm2018modulationofprotein pages 39-42, tungkum2023regulatingthetrafficking pages 35-39, daverkausenfischer2024erresidentcochaperonesina pages 56-58)

1.2 Domain architecture and motifs relevant for function

A 2024 critical synthesis of ER-resident co-chaperones describes ERdj3/DNAJB11 as a 358-aa protein with: a cleavable signal peptide, J-domain (aa17–88), G/F-rich region (aa88–129), and a cysteine-rich region (aa160–201) with flanking regions forming a substrate-binding hydrophobic pocket. It also notes predicted N-glycosylation sites (including one experimentally supported EndoH-sensitive site) and highlights the lack of a C-terminal KDEL ER retrieval motif. These features support an ER-luminal role with potential secretion under stress. (daverkausenfischer2024erresidentcochaperonesin pages 52-56, daverkausenfischer2024erresidentcochaperonesina pages 52-56)

1.3 Core molecular function (what it “does”)

DNAJB11/ERdj3 is not an enzyme with a defined catalytic reaction; its primary function is as a co-chaperone that (i) can bind unfolded/misfolded secretory pathway proteins and (ii) via its J-domain stimulates BiP/HSPA5 ATP hydrolysis to promote productive BiP–client interactions in ER proteostasis/quality control. HPD motif integrity is critical for BiP binding and ATPase stimulation. (abouelazm2018modulationofprotein pages 39-42, daverkausenfischer2024erresidentcochaperonesina pages 56-58)

2) Subcellular localization and where it acts

2.1 ER luminal localization with secretion potential

ERdj3/DNAJB11 is described as a soluble ER Hsp40 co-chaperone targeted to the ER by an N-terminal signal sequence and lacking a transmembrane segment and canonical KDEL retention motif, consistent with ER luminal localization while retaining the capacity for stress-induced secretion. (abouelazm2018modulationofprotein pages 39-42, daverkausenfischer2024erresidentcochaperonesin pages 52-56, daverkausenfischer2024erresidentcochaperonesina pages 56-58)

2.2 Functional coupling to the Sec61 translocon and ER homeostasis

ERdj3 has been reported to interact with the Sec61 translocon and to influence processes such as protein translocation and ER calcium leakage/gating through Sec61, indicating it can participate not only in client folding/triage but also in broader ER homeostatic control. (abouelazm2018modulationofprotein pages 39-42, daverkausenfischer2024erresidentcochaperonesina pages 58-62, daverkausenfischer2024erresidentcochaperonesina pages 65-68)

3) Mechanism and structural biology: ERdj3 as a tetrameric Hsp40

3.1 Tetramerization is a native functional state

A key primary study (EMBO Journal, 2017) provides strong evidence that ERdj3/DNAJB11 natively assembles and functions as a tetramer. Using gel filtration and analytical ultracentrifugation, the apparent molecular mass was ~166 kDa, close to the predicted ~153 kDa for a tetramer, and negative-stain EM supported a diamond-shaped dimer-of-dimers architecture. (chen2017theendoplasmicreticulum pages 2-3)

3.2 Functional significance of oligomeric state

The same study reports that engineered disruption of tetramerization (e.g., a deletion converting the protein to a stable dimer) impaired substrate binding and reduced interaction with BiP, and could worsen secretion outcomes for an aggregation-prone client under ER stress when overexpressed. This supports a model in which quaternary structure contributes to client engagement and/or productive BiP coupling. (chen2017theendoplasmicreticulum pages 1-2, chen2017theendoplasmicreticulum pages 2-3)

4) Roles in ER proteostasis pathways (folding, ERAD/triage, UPR)

4.1 BiP-centered ER folding/triage circuit

ERdj3 binds unfolded proteins and supports their handoff to BiP, where BiP ATP-driven conformational cycling enables folding or triage. A review-style synthesis describes a two-step mechanism: ERdj3 binds substrate first, then transfers it to BiP; importantly, BiP ATP hydrolysis is required for ERdj3 release from substrate complexes, and BiP mutants defective in ATP hydrolysis fail to release ERdj3. (daverkausenfischer2024erresidentcochaperonesina pages 58-62, daverkausenfischer2024erresidentcochaperonesina pages 56-58)

4.2 Client-specific quality control: mutant glucocerebrosidase (Gaucher disease)

A primary mechanistic paper (Chemistry & Biology, 2014) identifies ERdj3 as an ER degradation/ERAD-promoting factor for misfolded glucocerebrosidase (GCase) variants linked to Gaucher disease. In patient-derived fibroblasts, ERdj3 knockdown achieved >90% transcript and >75% protein reduction and increased maturation/trafficking markers (e.g., increased EndoH-resistant forms), lysosomal localization, and lysosomal enzyme activity for mutant GCase variants (e.g., L444P, N370S). Reported effect sizes included increases in activity such as ~1.2× (ERdj3 knockdown) and ~1.4× (co-knockdown with another factor), and a longer knockdown regimen increased activity ~2.9×; pharmacologic elevation of ER Ca2+ with diltiazem (10 µM) increased activity ~1.5× and showed synergy with ERdj3 depletion. The study emphasized that raising mutant activity toward ~20% of WT from ~11–15% could be clinically meaningful (context for disease thresholding). (tan2014erdj3isan pages 3-4, tan2014erdj3isan pages 6-7, tan2014erdj3isan pages 4-5)

Interpretation: for at least some destabilized luminal enzymes, ERdj3 can bias the folding vs degradation decision toward degradation; inhibiting ERdj3 can allow partitioning into alternative pro-folding pathways (e.g., calnexin cycle). (tan2014erdj3isan pages 6-7, tan2014erdj3isan pages 4-5)

4.3 Client-specific quality control: Z alpha-1-antitrypsin (AAT deficiency)

In an AAT KO Huh7.5 hepatocyte system expressing the Z-variant AAT (ZAAT), ERdj3 knockdown by siRNA (~70% reduction in endogenous ERdj3) increased intracellular ZAAT degradation over a 4-hour pulse–chase. Pharmacologic perturbations implicated lysosome/autophagy pathways: bafilomycin A1 strongly inhibited the increased degradation induced by ERdj3 knockdown, whereas proteasome inhibition (MG132) had less effect. ERdj3 overexpression increased ZAAT polymer formation and co-localization with polymeric species. Secreted ZAAT levels (ELISA) were not significantly changed by ERdj3 depletion despite the intracellular degradation changes. (khodayari2017erdj3hasan pages 9-13)

Interpretation: ERdj3 can have client- and pathway-dependent effects; in this system, ERdj3 appears to stabilize/retain ZAAT in a manner that reduces its autophagic/lysosomal clearance, and lowering ERdj3 shifts ZAAT toward degradative routes. (khodayari2017erdj3hasan pages 9-13)

4.4 UPR regulation and ER stress response

Several sources converge on ERdj3 as stress-inducible and connected to the UPR, including regulation at the transcriptional level and functional coupling to ER stress handling. A 2018 synthesis reports that ER stress can elevate extracellular ERdj3 and that hepatic ER stress in mice increased serum ERdj3 from ~25 nM to ~50 nM, and that >40% of newly synthesized ERdj3 can be secreted after ER stress or ATF6 activation. (abouelazm2018modulationofprotein pages 39-42)

5) Secretion, extracellular roles, and biomarker applications

5.1 ERdj3 as a secreted chaperone in extracellular proteostasis

Although ERdj3 is ER luminal, multiple sources describe a model in which ER stress leads to ERdj3 secretion either unbound (when BiP capacity is available) or in complexes with misfolded clients (when ER proteostasis is overwhelmed), supporting a role in extracellular anti-aggregation chaperoning and potentially cell-surface signaling modulation. (abouelazm2018modulationofprotein pages 39-42, chen2017theendoplasmicreticulum pages 1-2)

5.2 Biomarker concepts: serum and urine ERdj3

Because ERdj3 secretion increases with ER stress, it has been discussed as a candidate ER stress biomarker. Quantitatively, serum changes in mice (25 nM to 50 nM under hepatic ER stress) and the >40% secretion fraction after ER stress/ATF6 activation provide a rationale for systemic detectability. (abouelazm2018modulationofprotein pages 39-42)

A 2024 critical review further summarizes evidence that ERdj3 can be detected in urine and increases under ER stress conditions (e.g., after tunicamycin), with urinary ERdj3 correlating with onset of proteinuria in nephritis models, supporting its use as a urinary marker of glomerular ER stress in preclinical contexts. (daverkausenfischer2024erresidentcochaperonesina pages 68-71, daverkausenfischer2024erresidentcochaperonesin pages 68-71)

5.3 Real-world/clinical-translation context

The biomarker framing is strengthened by disease-linked settings where ER stress is prominent (glomerular disease, nephritis models), but the retrieved excerpts in this run did not include full numeric performance statistics (AUC/ROC, sensitivity/specificity) for ERdj3 as a biomarker; therefore, its “implementation” should currently be regarded as emerging/experimental within the literature available here. (daverkausenfischer2024erresidentcochaperonesina pages 68-71, daverkausenfischer2024erresidentcochaperonesin pages 68-71)

6) Disease relevance with emphasis on 2023–2024 developments

6.1 DNAJB11 and polycystic kidney disease: new mechanistic mouse evidence (2024)

A 2024 bioRxiv preprint directly connects DNAJB11 to atypical polycystic kidney disease mechanisms using mouse genetics and cell models. Key quantitative findings include:

• Reduced survival of constitutive Dnajb11−/− mice: only 7/61 weaned pups (~11%) were homozygous, and embryonic homozygotes were ~17% at E17.5; all homozygous embryos had polycystic kidneys. (busch2024theroleof pages 5-8)
• Nephron segment origin: cysts/dilations were predominantly proximal tubule-derived (LRP2+); distal-nephron deletion (Ksp-Cre) did not produce cysts even at one year. (busch2024theroleof pages 5-8)
• Mechanism—polycystin-1 (PC1) processing: Dnajb11 deletion reduced the ratio of cleaved PC1 C-terminal fragment to full-length PC1; re-expression of human DNAJB11 rescued PC1 cleavage, but a patient-associated mutant (p.Pro54Arg) did not, and another (p.Leu77Pro) was unstable/undetectable. (busch2024theroleof pages 5-8, busch2024theroleof pages 8-12)
• Proteomics: differential expression analysis identified 123 proteins altered in DNAJB11-deficient cells versus 178 in PC1-deficient cells, with only 12 concordantly regulated, suggesting partially distinct downstream responses. (busch2024theroleof pages 8-12)

Interpretation: these results support DNAJB11 as a BiP-associated ER co-chaperone that is specifically required for proper biogenesis/cleavage processing of at least some large secretory pathway clients such as PC1, and that loss can drive cystogenesis from particular renal tubular segments. (busch2024theroleof pages 8-12, busch2024theroleof pages 5-8)

6.2 Human genetics/clinical cohort (2023): DNAJB11 variants in ADPKD spectrum

A 2023 paper in Genes focuses on DNAJB11 variants in ADPKD patients in a monocentric cohort and frames DNAJB11 nephropathy as an overlap between ADPKD and tubulointerstitial phenotypes. The excerpt available in this run confirms the existence and topic of this cohort and mentions biopsy fibrosis prevalence in one case (~60% of sample), but the extracted text here did not include full cohort-level statistics (e.g., n, allele frequencies, imaging metrics distributions). Accordingly, detailed cohort statistics cannot be reliably reported from the present evidence snippets alone. (aiello2023dnajb11mutationin pages 11-11)

7) Expert opinions and authoritative synthesis

7.1 2024 critical review perspective on ERdj3

A 2024 “critical analysis” review of ER-resident co-chaperones synthesizes extensive primary evidence on ERdj3/DNAJB11 structure, localization, regulation, secretion, client spectrum, and disease associations (including kidney disease, secretory proteostasis clients, and biomarker framing). It also highlights areas of controversy such as reported oligomeric states (tetramer vs monomer under different conditions) and emphasizes context dependence (ER pool vs secreted pool; partner binding such as SDF2/SDF2L1). (daverkausenfischer2024erresidentcochaperonesin pages 52-56, daverkausenfischer2024erresidentcochaperonesina pages 56-58, daverkausenfischer2024erresidentcochaperonesina pages 65-68)

7.2 Mechanistic consensus and what remains uncertain

Across primary and review sources, the best-supported core function is: ER luminal Hsp40/J-protein co-chaperone that binds unfolded polypeptides and uses its J-domain to regulate BiP activity, influencing folding/trafficking versus degradation and, under stress, extracellular proteostasis through secretion. (abouelazm2018modulationofprotein pages 39-42, daverkausenfischer2024erresidentcochaperonesina pages 56-58, chen2017theendoplasmicreticulum pages 1-2)

Uncertainties and gaps in this run: while ABBP-2 is a documented alias, this run did not retrieve primary mechanistic evidence specifically demonstrating the APOBEC1-binding function for the mouse protein; therefore that aspect cannot be expanded beyond synonym-level reporting here. (daverkausenfischer2024erresidentcochaperonesin pages 52-56, daverkausenfischer2024erresidentcochaperonesina pages 52-56)

8) Current applications and real-world implementations

1. Renal disease genetics/diagnostics: DNAJB11 is now discussed in the context of atypical cystic kidney disease/ADPKD genetics; recent mechanistic mouse work supports PC1 processing impairment as a causal axis, informing interpretation of variants of uncertain significance and pathway-based stratification. (busch2024theroleof pages 8-12, busch2024theroleof pages 5-8, aiello2023dnajb11mutationin pages 11-11)
2. Biomarkers for ER stress: ERdj3 is proposed as a secreted/urinary marker of ER stress (e.g., glomerular disease contexts), supported by stress-induced secretion and detectability in biofluids. (abouelazm2018modulationofprotein pages 39-42, daverkausenfischer2024erresidentcochaperonesina pages 68-71, daverkausenfischer2024erresidentcochaperonesin pages 68-71)
3. Proteostasis-directed therapy concepts: Cell and patient-fibroblast data suggest that modulating ERdj3 levels or ERdj3-mediated triage can increase functional output of destabilized lysosomal enzymes (e.g., GCase mutants), supporting the broader concept of targeting ER quality control components to rescue folding/trafficking of disease mutants. (tan2014erdj3isan pages 3-4, tan2014erdj3isan pages 4-5)

Summary of key quantitative/statistical points (from retrieved evidence)

• ER stress in mice: serum ERdj3 ~25 nM → ~50 nM; >40% newly synthesized ERdj3 secreted after ER stress/ATF6 activation. (abouelazm2018modulationofprotein pages 39-42)
• ERdj3 concentration in dog pancreas microsomes: 0.29 µM (contextual quantitation of luminal abundance). (daverkausenfischer2024erresidentcochaperonesina pages 56-58)
• ERdj3 tetramer: AUC apparent MW ~166 kDa (vs predicted 153 kDa tetramer). (chen2017theendoplasmicreticulum pages 2-3)
• Gaucher fibroblasts: ERdj3 knockdown >90% transcript, >75% protein; mutant GCase activity increased (e.g., ~1.2×, ~1.4× with co-knockdown; ~2.9× with prolonged knockdown; diltiazem 10 µM ~1.5×). (tan2014erdj3isan pages 3-4, tan2014erdj3isan pages 4-5)
• ZAAT hepatocyte model: ERdj3 knockdown ~70%; increased intracellular ZAAT degradation in 4 h pulse–chase, blocked strongly by bafilomycin A1 (lysosome/autophagy), less by MG132 (proteasome). (khodayari2017erdj3hasan pages 9-13)
• 2024 Dnajb11−/− mice: 7/61 weaned (~11%) homozygous; ~17% homozygous at E17.5; proteomics 123 vs 178 DE proteins with 12 concordant between DNAJB11- vs PC1-deficiency. (busch2024theroleof pages 5-8, busch2024theroleof pages 8-12)

Consolidated fact table

Table: This table summarizes the verified identity, molecular function, localization, experimental evidence, disease relevance, and recent developments for mouse Dnajb11/DNAJB11/ERdj3. It highlights key quantitative findings useful for functional annotation and evidence-based reporting.

References

1. (daverkausenfischer2024erresidentcochaperonesin pages 52-56): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

2. (daverkausenfischer2024erresidentcochaperonesina pages 52-56): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

3. (tungkum2023regulatingthetrafficking pages 35-39): Wanida Tungkum. Regulating the trafficking of the unfolded protein response (upr) reporter atf6. Text, Jan 2023. URL: https://doi.org/10.5525/gla.thesis.83743, doi:10.5525/gla.thesis.83743. This article has 2 citations and is from a peer-reviewed journal.

4. (abouelazm2018modulationofprotein pages 39-42): NT Abouelazm. Modulation of protein folding in the endoplasmic reticulum as a mechanism-based therapy for glomerular disease. Unknown journal, 2018.

5. (daverkausenfischer2024erresidentcochaperonesina pages 56-58): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

6. (daverkausenfischer2024erresidentcochaperonesina pages 58-62): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

7. (daverkausenfischer2024erresidentcochaperonesina pages 65-68): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

8. (chen2017theendoplasmicreticulum pages 2-3): Kai‐Chun Chen, Song Qu, Saikat Chowdhury, Isabelle C Noxon, Joseph D Schonhoft, Lars Plate, Evan T Powers, Jeffery W Kelly, Gabriel C Lander, and R Luke Wiseman. The endoplasmic reticulum hsp40 co‐chaperone erdj3/dnajb11 assembles and functions as a tetramer. The EMBO Journal, 36:2296-2309, Aug 2017. URL: https://doi.org/10.15252/embj.201695616, doi:10.15252/embj.201695616. This article has 66 citations.

9. (chen2017theendoplasmicreticulum pages 1-2): Kai‐Chun Chen, Song Qu, Saikat Chowdhury, Isabelle C Noxon, Joseph D Schonhoft, Lars Plate, Evan T Powers, Jeffery W Kelly, Gabriel C Lander, and R Luke Wiseman. The endoplasmic reticulum hsp40 co‐chaperone erdj3/dnajb11 assembles and functions as a tetramer. The EMBO Journal, 36:2296-2309, Aug 2017. URL: https://doi.org/10.15252/embj.201695616, doi:10.15252/embj.201695616. This article has 66 citations.

10. (tan2014erdj3isan pages 3-4): Yun Lei Tan, Joseph C. Genereux, Sandra Pankow, Johannes M.F.G. Aerts, John R. Yates, and Jeffery W. Kelly. Erdj3 is an endoplasmic reticulum degradation factor for mutant glucocerebrosidase variants linked to gaucher's disease. Chemistry & biology, 21 8:967-76, Aug 2014. URL: https://doi.org/10.1016/j.chembiol.2014.06.008, doi:10.1016/j.chembiol.2014.06.008. This article has 97 citations.

11. (tan2014erdj3isan pages 6-7): Yun Lei Tan, Joseph C. Genereux, Sandra Pankow, Johannes M.F.G. Aerts, John R. Yates, and Jeffery W. Kelly. Erdj3 is an endoplasmic reticulum degradation factor for mutant glucocerebrosidase variants linked to gaucher's disease. Chemistry & biology, 21 8:967-76, Aug 2014. URL: https://doi.org/10.1016/j.chembiol.2014.06.008, doi:10.1016/j.chembiol.2014.06.008. This article has 97 citations.

12. (tan2014erdj3isan pages 4-5): Yun Lei Tan, Joseph C. Genereux, Sandra Pankow, Johannes M.F.G. Aerts, John R. Yates, and Jeffery W. Kelly. Erdj3 is an endoplasmic reticulum degradation factor for mutant glucocerebrosidase variants linked to gaucher's disease. Chemistry & biology, 21 8:967-76, Aug 2014. URL: https://doi.org/10.1016/j.chembiol.2014.06.008, doi:10.1016/j.chembiol.2014.06.008. This article has 97 citations.

13. (khodayari2017erdj3hasan pages 9-13): Nazli Khodayari, George Marek, Yuanqing Lu, Karina Krotova, Rejean Liqun Wang, and Mark Brantly. Erdj3 has an essential role for z variant alpha‐1‐antitrypsin degradation. Journal of Cellular Biochemistry, 118:3090-3101, Jun 2017. URL: https://doi.org/10.1002/jcb.26069, doi:10.1002/jcb.26069. This article has 31 citations and is from a peer-reviewed journal.

14. (daverkausenfischer2024erresidentcochaperonesina pages 68-71): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

15. (daverkausenfischer2024erresidentcochaperonesin pages 68-71): LV Daverkausen-Fischer. Er-resident co-chaperones in mammalian cells a critical analysis of experimental data published on structure, localization, regulation and function. Unknown journal, 2024.

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18. (aiello2023dnajb11mutationin pages 11-11): Valeria Aiello, Francesca Ciurli, Amalia Conti, Carlotta Pia Cristalli, Sarah Lerario, Francesca Montanari, Nicola Sciascia, Gisella Vischini, Benedetta Fabbrizio, Roberta Di Costanzo, Giulia Olivucci, Andrea Pietra, Antonia Lopez, Loretta Zambianchi, Gaetano La Manna, and Irene Capelli. Dnajb11 mutation in adpkd patients: clinical characteristics in a monocentric cohort. Genes, 15:3, Dec 2023. URL: https://doi.org/10.3390/genes15010003, doi:10.3390/genes15010003. This article has 2 citations.

19. (liu2022exosomaldnajb11promotes pages 20-20): Peng Liu, Fuqiang Zu, Hui Chen, Xiaoli Yin, and Xiaodong Tan. Exosomal dnajb11 promotes the development of pancreatic cancer by modulating the egfr/mapk pathway. Cellular & Molecular Biology Letters, Oct 2022. URL: https://doi.org/10.1186/s11658-022-00390-0, doi:10.1186/s11658-022-00390-0. This article has 26 citations and is from a peer-reviewed journal.

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Citations

1. chen2017theendoplasmicreticulum pages 2-3
2. abouelazm2018modulationofprotein pages 39-42
3. busch2024theroleof pages 5-8
4. busch2024theroleof pages 8-12
5. daverkausenfischer2024erresidentcochaperonesina pages 56-58
6. daverkausenfischer2024erresidentcochaperonesin pages 52-56
7. daverkausenfischer2024erresidentcochaperonesina pages 52-56
8. tungkum2023regulatingthetrafficking pages 35-39
9. daverkausenfischer2024erresidentcochaperonesina pages 58-62
10. daverkausenfischer2024erresidentcochaperonesina pages 65-68
11. chen2017theendoplasmicreticulum pages 1-2
12. daverkausenfischer2024erresidentcochaperonesina pages 68-71
13. daverkausenfischer2024erresidentcochaperonesin pages 68-71
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Dnajb11 curation notes

Deep research status: just deep-research-falcon mouse Dnajb11 --fallback perplexity-lite was first run on 2026-05-03 and timed out after 600 seconds; the requested perplexity-lite fallback failed with a 401 insufficient-quota error. Per course correction, just deep-research-falcon mouse Dnajb11 --timeout 1800 --fallback perplexity-lite was then run one gene at a time and succeeded, producing Dnajb11-deep-research-falcon.md.

Core evidence: Dnajb11/ERdj3 is an endoplasmic reticulum DnaJ/Hsp40 co-chaperone for BiP/Hspa5, supporting secretory-protein folding, maturation, and quality control. UniProt names the protein "ER-associated Hsp40 co-chaperone" and places it in the "Endoplasmic reticulum lumen".

Falcon synthesis: The Falcon report verifies the same identity and core function, describing DNAJB11/ERdj3 as a soluble ER-luminal Hsp40/J-domain co-chaperone for BiP/HSPA5 that uses its HPD-containing J-domain to regulate BiP ATPase/client handling. It also highlights tetrameric assembly, Sec61/ER homeostasis connections, stress-induced secretion, and disease contexts such as PC1 processing in cystic kidney disease [file:mouse/Dnajb11/Dnajb11-deep-research-falcon.md].

BiP cochaperone evidence: Marcinowski et al. studied BiP substrate discrimination and state that "A major BiP cochaperone in antibody folding, ERdj3, modulated the conformational space of BiP in a nucleotide-dependent manner" PMID:21217698.

ABBP2/apobec-1 evidence: The apoB mRNA editing paper states that ABBP-2 "binds to apobec-1" and that "Down-regulation of ABBP-2 expression in cultured cells inhibits endogenous apobec-1-mediated apoB mRNA editing" PMID:11584023. However, UniProt cautions that N-terminal GFP-tagged Dnajb11/ERdj3 failed ER targeting in the cited work, likely making the reported cytosolic/nuclear APOBEC1 interaction and apoB mRNA-editing annotations artifactual or unsupported for native Dnajb11 [file:mouse/Dnajb11/Dnajb11-uniprot.txt].

PRTG/neurogenesis evidence: The protogenin paper identifies ERdj3 as a PRTG ligand and reports that "Addition of purified ERdj3 protein into the P19 differentiation assay reduced neurogenesis" PMID:20335479. This supports a secreted/context-specific signaling role, not the core molecular function.

Curation rule: GO:0051082 unfolded protein binding is not the preferred term for DnaJ co-chaperone activity; GO:0044183 protein folding chaperone better captures the Hsp40 co-chaperone role. GO:0005515 protein binding is too generic when the evidence is BiP/Hsp70 or context-specific partners, and APOBEC1 binding should be removed because the native-protein evidence is compromised.