Comparing 2 hypotheses side-by-side
The co-chaperone CHIP (STUB1, encoded by STUB1) bridges HSP70/HSP90 to the proteasome. Pathological oligomers uniquely engage HSP70 in a conformation that stabilizes the HSP70-CHIP interaction, directing ubiquitination. Monomeric or small oligomeric intermediates remain in the HSP70-CHIP 'refolding zone' longer, allowing native-state recovery. This conformation-selective model is supported by evidence that CHIP preferentially ubiquitinates misfolded proteins over native proteins [PMID 27212786]
Pathological conformers expose 'aggregation nucleation' sequences—typically 5-15 residue hydrophobic stretches with high β-sheet propensity—that are buried in native folds but become accessible during misfolding. This recognition is mediated by HSP70 isoforms including HSPA8, HSPA1A, and their J-domain co-chaperones DNAJB6 and DNAJB2. Consistent with binding studies demonstrating that HSP70 preferentially binds α-synuclein at the N-terminal and NAC amyloidogenic regions (PMID 29463785), and that
| Dimension | CHIP-mediated ubiquitination s | Exposed amyloidogenic segments |
|---|---|---|
| Mechanistic | 0.450 | 0.650 |
| Evidence | 0.580 | 0.720 |
| Novelty | 0.650 | 0.600 |
| Feasibility | 0.580 | 0.850 |
| Impact | 0.720 | 0.800 |
| Druggability | 0.550 | 0.820 |
| Safety | 0.520 | 0.780 |
| Competition | 0.620 | 0.650 |
| Data | 0.600 | 0.800 |
| Reproducible | 0.520 | 0.720 |
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4 rounds · quality: 0.73
# Therapeutic Hypotheses: Chaperone Selectivity for Pathological Conformers ## Hypothesis 1: Co-chaperone heterogeneity determines conformational discrimination **Title:** J-protein co-chaperone rep...
# Critical Evaluation of Chaperone Selectivity Hypotheses ## Hypothesis 1: Co-chaperone Heterogeneity (DNAJB6/DNAJB2) **Weak Links:** - The "client code" is descriptive terminology lacking mechanist...
# Feasibility Assessment: Chaperone Selectivity Hypotheses ## Executive Summary Of the five hypotheses, **Hypothesis 3 (amyloidogenic segment recognition)** emerges as most feasible for therapeutic ...
{ "ranked_hypotheses": [ { "title": "Exposed amyloidogenic segments (β-sheet propensity residues) serve as HSP70 recognition codes", "description": "Pathological conformers expose 'a...
4 rounds · quality: 0.73
# Therapeutic Hypotheses: Chaperone Selectivity for Pathological Conformers ## Hypothesis 1: Co-chaperone heterogeneity determines conformational discrimination **Title:** J-protein co-chaperone rep...
# Critical Evaluation of Chaperone Selectivity Hypotheses ## Hypothesis 1: Co-chaperone Heterogeneity (DNAJB6/DNAJB2) **Weak Links:** - The "client code" is descriptive terminology lacking mechanist...
# Feasibility Assessment: Chaperone Selectivity Hypotheses ## Executive Summary Of the five hypotheses, **Hypothesis 3 (amyloidogenic segment recognition)** emerges as most feasible for therapeutic ...
{ "ranked_hypotheses": [ { "title": "Exposed amyloidogenic segments (β-sheet propensity residues) serve as HSP70 recognition codes", "description": "Pathological conformers expose 'a...