🧪
hypothesis

Phosphorylation-State Dependent Inhibition

Hypothesis

Phosphorylation-State Dependent Inhibition

Inhibitors that selectively disrupt HSP90 machinery only when tau substrates are hyperphosphorylated, containing phosphoserine/threonine recognition domains conjugated to HSP90 pathway disruptors to create activity-based selectivity for .
🧬 HSP90AA1🩺 drug-discovery🎯 Composite 46%💱 $0.52▲5.2%active
drug discovery
EvidencePending (0%)📖 5 cit🗣 1 debates 5 support 2 oppose
✓ All Quality Gates Passed
Mechanistic 0.50 (15%) Evidence 0.50 (15%) Novelty 0.50 (12%) Feasibility 0.50 (12%) Impact 0.00 (12%) Druggability 0.50 (10%) Safety 0.50 (8%) Competition 0.50 (6%) Data Avail. 0.50 (5%) Reproducible 0.50 (5%) KG Connect 0.50 (8%) 0.455 composite
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arXiv PreprintNeurIPSNature MethodsPLOS ONE
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Composite46%

🧪 Overview

Inhibitors that selectively disrupt HSP90 machinery only when tau substrates are hyperphosphorylated, containing phosphoserine/threonine recognition domains conjugated to HSP90 pathway disruptors to create activity-based selectivity for pathological tau species.

🧬 Mechanism

🔗 Mechanism from KG for HSP90AA1

Auto-built from this analysis's top knowledge-graph edges.

graph TD
    HSP90AA1["HSP90AA1"] -->|participates in| protein_folding["protein_folding"]
    FKBP5["FKBP5"] -->|protein interactio| HSP90AA1_1["HSP90AA1"]
    FKBP4["FKBP4"] -->|protein interactio| HSP90AA1_2["HSP90AA1"]
    MAPT["MAPT"] -->|regulates| HSP90AA1_3["HSP90AA1"]
    HSP90AA1_4["HSP90AA1"] -->|regulates| tau_protein["tau protein"]
    FKBP51["FKBP51"] -.->|inhibits| HSP90AA1_5["HSP90AA1"]
    Ganetespib["Ganetespib"] -.->|inhibits| HSP90AA1_6["HSP90AA1"]
    n17_AAG["17-AAG"] -.->|inhibits| HSP90AA1_7["HSP90AA1"]
    HSP90AA1_8["HSP90AA1"] -->|regulates| tau_HSP90_interactions["tau-HSP90 interactions"]
    Co_chaperones["Co-chaperones"] -->|modulates| HSP90AA1_function["HSP90AA1 function"]
    HSP90AA1_9["HSP90AA1"] -->|regulates| proteasomal_degradation_p["proteasomal degradation pathway"]
    HSP90AA1_C_terminal_domai["HSP90AA1 C-terminal domain"] -->|regulates| tau_HSP90_complex_formati["tau-HSP90 complex formation"]
    style HSP90AA1 fill:#ce93d8,stroke:#333,color:#000
    style protein_folding fill:#81c784,stroke:#333,color:#000
    style FKBP5 fill:#ce93d8,stroke:#333,color:#000
    style HSP90AA1_1 fill:#ce93d8,stroke:#333,color:#000
    style FKBP4 fill:#ce93d8,stroke:#333,color:#000
    style HSP90AA1_2 fill:#ce93d8,stroke:#333,color:#000
    style MAPT fill:#ce93d8,stroke:#333,color:#000
    style HSP90AA1_3 fill:#ce93d8,stroke:#333,color:#000
    style HSP90AA1_4 fill:#4fc3f7,stroke:#333,color:#000
    style tau_protein fill:#4fc3f7,stroke:#333,color:#000
    style FKBP51 fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_5 fill:#4fc3f7,stroke:#333,color:#000
    style Ganetespib fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_6 fill:#4fc3f7,stroke:#333,color:#000
    style n17_AAG fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_7 fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_8 fill:#4fc3f7,stroke:#333,color:#000
    style tau_HSP90_interactions fill:#4fc3f7,stroke:#333,color:#000
    style Co_chaperones fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_function fill:#4fc3f7,stroke:#333,color:#000
    style HSP90AA1_9 fill:#4fc3f7,stroke:#333,color:#000
    style proteasomal_degradation_p fill:#81c784,stroke:#333,color:#000
    style HSP90AA1_C_terminal_domai fill:#4fc3f7,stroke:#333,color:#000
    style tau_HSP90_complex_formati fill:#4fc3f7,stroke:#333,color:#000

⚖️ Evidence

⚖️ Evidence Matrix5 supports2 contradicts
Supports
Folding or holding?-Hsp70 and Hsp90 chaperoning of misfolded proteins in neurodegenerative disease.
J Biol Chem2022PMID:35398094medium
Supports
Hsp90-interacting Co-chaperones and their Family Proteins in Tau Regulation: Introducing a Novel Role for Cdc37L1.
Neuroscience2021PMID:33246057medium
Supports
The Hsp90 cochaperone, FKBP51, increases Tau stability and polymerizes microtubules.
J Neurosci2010PMID:20071522medium
Supports
To fold or not to fold: modulation and consequences of Hsp90 inhibition.
Future Med Chem2009PMID:20161407medium
Supports
Hsp90 co-chaperones, FKBP52 and Aha1, promote tau pathogenesis in aged wild-type mice.
Acta Neuropathol Commun2021PMID:33832539medium
Contradicts
Pharmacological mechanism and therapeutic efficacy of Icariside II in the treatment of acute ischemic stroke: a systematic review and network pharmacological analysis.
BMC Complement Med Ther2022PMID:36180911medium
Contradicts
Mapping the pathogenic nexus: Gene overlap and protein interaction networks in Alzheimer's and breast cancer as a precursor to protein structure prediction and analysis.
Adv Protein Chem Struct Biol2025PMID:40973403medium
📖 Linked Papers

No linked papers recorded for this hypothesis yet.

🏥 Translation

🧬 3D Protein Structure — HSP90AA1

🧬 PDB 2CG9 Click to expand

Experimental structure from RCSB PDB | Powered by Mol*

💉 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.

🔍 Search ClinVar for HSP90AA1 →

No DepMap CRISPR Chronos data found for HSP90AA1.

Run python3 scripts/backfill_hypothesis_depmap.py to populate.

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📊 Market Indicators

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🔮 Predictions

🔎 Predictions vs Observations2 predictions · 0 with recorded observations
PredictionPredictedObservedStatusConf
IF PS19 tau P301S transgenic mice (8 months old, n≥10/group) with established tau pathology receive intraperitoneal injections of a phospho-tau selective HSP90 inhibitor (10 mg/kg) three times weekly Hippocampal Sarkozyl-positive tau signal reduction ≥40% (p<0.01), with <15% change in total tau (Tau5 ELISA)— no observation —pending0.55
IF phosphoserine/threonine recognition domain-HSP90 disruptor conjugates are applied to in vitro HSP90 complexes pre-incubated with hyperphosphorylated tau (p-tau Ser396/404) versus non-phosphorylatedIC50 ratio (non-phosphorylated/p-tau condition) ≥2.0, with >50% differential inhibition at 1 µM concentration— no observation —pending0.65
🔮 Falsifiable Predictions (2)
pendingconf 65%
IF phosphoserine/threonine recognition domain-HSP90 disruptor conjugates are applied to in vitro HSP90 complexes pre-incubated with hyperphosphorylated tau (p-tau Ser396/404) versus non-phosphorylated recombinant tau, THEN p-tau-bound HSP90 activity will be inhibited at least 50% greater potency (lo
Predicted outcome: IC50 ratio (non-phosphorylated/p-tau condition) ≥2.0, with >50% differential inhibition at 1 µM concentration
Falsification: IC50 values differ by <1.2-fold between phosphorylated and non-phosphorylated tau conditions, indicating no phosphorylation-state selectivity
pendingconf 55%
IF PS19 tau P301S transgenic mice (8 months old, n≥10/group) with established tau pathology receive intraperitoneal injections of a phospho-tau selective HSP90 inhibitor (10 mg/kg) three times weekly for 4 weeks, THEN Sarko-positive/AT100-positive pathological tau species will decrease by ≥40% in hi
Predicted outcome: Hippocampal Sarkozyl-positive tau signal reduction ≥40% (p<0.01), with <15% change in total tau (Tau5 ELISA)
Falsification: Pathological tau reduction <20% OR total tau decreases proportionally (>25%), indicating loss of selectivity rather than activity-based targeting of phospho-dependent conformation
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