J-protein co-chaperone repertoire drives ATP-independent disaggregation through membrane-associated complexes
🧪 Overview
The J-protein co-chaperone system operates through a novel ATP-independent disaggregation mechanism that localizes pathogenic protein recognition to specific membrane compartments. Rather than relying on HSP70 ATPase cycling, DNAJB6 and DNAJB2 form constitutively active membrane-associated complexes at the endoplasmic reticulum and mitochondrial surfaces through direct lipid interactions via their amphipathic helices. DNAJB6's S/T-rich domain contains cryptic membrane-binding motifs that become exposed upon interaction with β-sheet aggregates, anchoring the chaperone-substrate complex to ER membranes where co-localized proteolytic machinery can access misfolded targets. This spatial sequestration mechanism enables selective aggregate processing without depleting cytosolic chaperone resources. DNAJB2 exhibits preferential association with mitochondrial outer membranes through its unique N-terminal membrane-targeting sequence, where it coordinates with HSPA8 to form disaggregation platforms adjacent to mitochondrial protein import machinery.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["Misfolded Substrate<br/>Tau / alpha-Syn / SOD1 Aggregates"]
B["DNAJB6 / DNAJB2 J-protein<br/>Substrate Recognition and Handoff"]
C["HSPA8 / HSPA1A Hsp70<br/>ATP-Dependent Refolding"]
D["Selective Client Triage<br/>Refold vs Proteasomal Routing"]
E["Ubiquitin-Proteasome Pathway<br/>Clearance of Irreversible Aggregates"]
F["Proteostasis Maintenance<br/>Reduced Inclusion Body Formation"]
A --> B
B --> C
C --> D
D --> E
D --> F
style A fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style B fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style F fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — DNAJB6
No curated PDB or AlphaFold mapping for DNAJB6 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for DNAJB6, DNAJB2, HSPA8, HSPA1A from GTEx v10.
💉 Clinical Trials
No clinical trials data linked to this hypothesis yet.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for DNAJB6, DNAJB2, HSPA8, HSPA1A.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |