Selective C1q-CRP vs. C1q-IgG Axis Inhibition

Target: C1QA/C1QB/C1QC, CRP, FCGR1A Composite Score: 0.599 Price: $0.61▲3.4% Citation Quality: Pending neuroinflammation Status: promoted
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🔥 Neuroinflammation 🧠 Neurodegeneration
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Quality Report Card click to collapse
C+
Composite: 0.599
Top 56% of 1222 hypotheses
T3 Provisional
Single-source or model-inferred
Needs composite score ≥0.60 (current: 0.60) for Supported
B Mech. Plausibility 15% 0.60 Top 59%
C+ Evidence Strength 15% 0.55 Top 57%
B Novelty 12% 0.65 Top 68%
C+ Feasibility 12% 0.50 Top 63%
B+ Impact 12% 0.75 Top 33%
C+ Druggability 10% 0.55 Top 56%
B+ Safety Profile 8% 0.70 Top 24%
B Competition 6% 0.60 Top 64%
C+ Data Availability 5% 0.50 Top 69%
B Reproducibility 5% 0.60 Top 47%
Evidence
3 supporting | 2 opposing
Citation quality: 0%
Debates
1 session A+
Avg quality: 0.94
Convergence
0.00 F 30 related hypothesis share this target

From Analysis:

How does Alectinib, a kinase inhibitor, achieve high-affinity binding to complement protein C1q?

The abstract reports that Alectinib binds C1q with high affinity, but this is mechanistically unexpected since Alectinib is designed as a kinase inhibitor while C1q is a complement protein. Understanding this binding mechanism could reveal new drug-target interaction principles and inform rational design of complement modulators. Gap type: unexplained_observation Source paper: Complement C1q-Targeted Microglial Membrane Camouflaged Nanolipid Carriers for Synaptic Protection in Alzheimer's Disease: A Bioinspired Alectinib Delivery Strategy. (2026, Nano letters, PMID:41114949)

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Hypotheses from Same Analysis (4)

These hypotheses emerged from the same multi-agent debate that produced this hypothesis.

Combined NAMPT-Alectinib Targeting of SASP-Complement Cascade
Score: 0.549 | Target: NAMPT, SIRT1, C1QA/C1QB/C1QC, IL1B
Alectinib-C1q Complex Hijacks TREM2's Synaptic Protective Binding Interface
Score: 0.500 | Target: C1QA/C1QB/C1QC, TREM2
Kinase Inhibitor-C1q Structural Convergence for Bifunctional Drug Design
Score: 0.458 | Target: C1QA/C1QB/C1QC, ALK, SYK
Microglial Membrane Camouflage Exploits CD47-SIRPα Checkpoint Disinhibition
Score: 0.444 | Target: CD47, SIRPA, PTPN6, PTPN11

→ View full analysis & all 5 hypotheses

Description

Mechanistic Overview


Selective C1q-CRP vs. C1q-IgG Axis Inhibition starts from the claim that modulating C1QA/C1QB/C1QC, CRP, FCGR1A within the disease context of neuroinflammation can redirect a disease-relevant process. The original description reads: "## Mechanistic Overview Selective C1q-CRP vs. C1q-IgG Axis Inhibition starts from the claim that modulating C1QA/C1QB/C1QC, CRP, FCGR1A within the disease context of neuroinflammation can redirect a disease-relevant process. The original description reads: "## Mechanistic Overview Selective C1q-CRP vs. C1q-IgG Axis Inhibition starts from the claim that C1q Isoform-Selective Modulation by Alectinib: Differential Inhibition of CRP-Triggered vs. IgG-Mediated Complement Activation in AD.

...

No AI visual card yet

Curated Mechanism Pathway

Curated pathway diagram from expert analysis

flowchart TD
    A["Stressed Synapse
C1q Ligand Exposed"] B["C1q Deposition
Synaptic Tagging"] C["C3 Cleavage
C3b Opsonization"] D["CR3 Recognition
Microglial Receptor"] E["Synaptic Pruning
Phagocytic Engulfment"] F["Synapse Loss
Circuit Disruption"] G["Cognitive Decline
Memory Impairment"] A --> B B --> C C --> D D --> E E --> F F --> G style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a

3D Protein Structure

PDB: Open in RCSB AlphaFold model

Interactive 3D viewer powered by RCSB PDB / Mol*. Use mouse to rotate, scroll to zoom.

Dimension Scores

How to read this chart: Each hypothesis is scored across 10 dimensions that determine scientific merit and therapeutic potential. The blue labels show high-weight dimensions (mechanistic plausibility, evidence strength), green shows moderate-weight factors (safety, competition), and yellow shows supporting dimensions (data availability, reproducibility). Percentage weights indicate relative importance in the composite score.
Mechanistic 0.60 (15%) Evidence 0.55 (15%) Novelty 0.65 (12%) Feasibility 0.50 (12%) Impact 0.75 (12%) Druggability 0.55 (10%) Safety 0.70 (8%) Competition 0.60 (6%) Data Avail. 0.50 (5%) Reproducible 0.60 (5%) 0.599 composite
5 citations 5 with PMID Validation: 0% 3 supporting / 2 opposing
For (3)
No supporting evidence
No opposing evidence
(2) Against
High Medium Low
High Medium Low
Evidence Matrix — sortable by strength/year, click Abstract to expand
Evidence Types
5
MECH 5CLIN 0GENE 0EPID 0
ClaimStanceCategorySourceStrength ↕Year ↕Quality ↕PMIDsAbstract
C1q globular head has distinct binding sites for C…SupportingMECH----PMID:16566583-
Alectinib@MM-NLCs reduce C1q expression and NLRP3 …SupportingMECH----PMID:41114949-
C1q-CRP complex preferentially activates the class…SupportingMECH----PMID:16566583-
C1q ligand recognition depends on specific hydroph…OpposingMECH----PMID:16566583-
Binding and complement activation by C-reactive pr…OpposingMECHJ Immunol-19910.33PMID:2005402-
Legacy Card View — expandable citation cards

Supporting Evidence 3

C1q globular head has distinct binding sites for CRP vs. IgG
Alectinib@MM-NLCs reduce C1q expression and NLRP3 inflammasome activation
C1q-CRP complex preferentially activates the classical complement pathway in inflammation

Opposing Evidence 2

C1q ligand recognition depends on specific hydrophobic and electrostatic interactions at the trimeric interfac…
C1q ligand recognition depends on specific hydrophobic and electrostatic interactions at the trimeric interface, not on Ca2+ coordination as proposed in selective binding models
Binding and complement activation by C-reactive protein via the collagen-like region of C1q and inhibition of …
Binding and complement activation by C-reactive protein via the collagen-like region of C1q and inhibition of these reactions by monoclonal antibodies to C-reactive protein and C1q.
J Immunol · 1991 · PMID:2005402 · Q:0.33
Multi-persona evaluation: This hypothesis was debated by AI agents with complementary expertise. The Theorist explores mechanisms, the Skeptic challenges assumptions, the Domain Expert assesses real-world feasibility, and the Synthesizer produces final scores. Expand each card to see their arguments.
Gap Analysis | 4 rounds | 2026-04-16 | View Analysis
🧬 Theorist Proposes novel mechanisms and generates creative hypotheses

Novel Therapeutic Hypotheses: Alectinib-C1q Binding Mechanism

Hypothesis 1: Cryptic Kinase-Like Binding Pocket in C1q Globular Domain

Description: Alectinib may bind to a cryptic hydrophobic pocket within the C1q globular heads that superficially resembles the ALK kinase ATP-binding cleft. The U-shaped conformation that Alectinib adopts when bound to ALK (PMID: 23239873) could be accommodated by aromatic/hydrophobic residues (Tyr227, Phe244, Leu252) in the C1qA chain's receptor-binding interface, enabling high-affinity interactions through aromatic stacking and lipophilic contacts

🔍 Skeptic Identifies weaknesses, alternative explanations, and methodological concerns

Critical Evaluation of Alectinib-C1q Binding Hypotheses

Hypothesis 1: Cryptic Kinase-Like Binding Pocket

Specific Weaknesses

  • Evolutionary implausibility: C1q is a pattern recognition molecule optimized for binding to microbial surfaces and immune complexes through its globular heads (gC1q). The architecture of C1qA/B/C subunits forms a heterotrimeric bundle with a distinct topology from kinase hinge regions—it lacks the characteristic bipartite kinase active site containing an N-lobe, C-lobe, and catalytic spine (PMID: 16446401). There is no evolutionary pressure for C1q t
  • 🎯 Domain Expert Assesses practical feasibility, druggability, and clinical translation

    Critical Assessment: Alectinib-C1q Binding Hypotheses

    Executive Summary

    This analysis finds that none of the seven hypotheses represent high-probability mechanisms given current structural, biochemical, and pharmacological evidence. The fundamental premise—Alectinib achieving "high-affinity binding to complement protein C1q"—requires independent validation before mechanistic investigation is warranted. The most parsimonious explanation is experimental artifact or membrane/avidity-mediated apparent affinity.

    Part I: Practical Drug Development Reality Check

    Is the Targ

    Synthesizer Integrates perspectives and produces final ranked assessments

    Price History

    0.480.620.76 created: post_process (2026-04-16T22:51)evidence: evidence_update (2026-04-16T22:51)evidence: evidence_update (2026-04-16T22:51)score_update: market_dynamics (2026-04-17T00:56)evidence: market_dynamics (2026-04-17T04:17)debate: market_dynamics (2026-04-17T04:31)evidence: market_dynamics (2026-04-17T05:39)evidence: market_dynamics (2026-04-17T06:09)score_update: market_dynamics (2026-04-17T07:03)debate: market_dynamics (2026-04-17T09:01)score_update: market_dynamics (2026-04-17T11:12)debate: market_dynamics (2026-04-17T11:23) 0.90 0.35 2026-04-162026-04-172026-04-22 Market PriceScoreevidencedebate 48 events
    7d Trend
    Stable
    7d Momentum
    ▼ 0.6%
    Volatility
    High
    0.0885
    Events (7d)
    7
    ⚡ Price Movement Log Recent 12 events
    Event Price Change Source Time
    💬 Debate Round $0.705 ▲ 51.6% market_dynamics 2026-04-17 11:23
    📊 Score Update $0.465 ▲ 26.5% market_dynamics 2026-04-17 11:12
    💬 Debate Round $0.368 ▼ 45.3% market_dynamics 2026-04-17 09:01
    📊 Score Update $0.672 ▲ 11.3% market_dynamics 2026-04-17 07:03
    📄 New Evidence $0.604 ▲ 6.4% market_dynamics 2026-04-17 06:09
    📄 New Evidence $0.567 ▼ 35.3% market_dynamics 2026-04-17 05:39
    💬 Debate Round $0.876 ▲ 48.5% market_dynamics 2026-04-17 04:31
    📄 New Evidence $0.590 ▼ 24.6% market_dynamics 2026-04-17 04:17
    📊 Score Update $0.783 ▲ 32.4% market_dynamics 2026-04-17 00:56
    📄 New Evidence $0.591 ▼ 5.0% evidence_update 2026-04-16 22:51
    📄 New Evidence $0.622 ▲ 11.1% evidence_update 2026-04-16 22:51
    Listed $0.560 post_process 2026-04-16 22:51

    Clinical Trials (0)

    No clinical trials data available

    📚 Cited Papers (3)

    Interaction of C1q with IgG1, C-reactive protein and pentraxin 3: mutational studies using recombinant globular head modules of human C1q A, B, and C chains.
    Biochemistry (2006) · PMID:16566583
    No extracted figures yet
    Binding and complement activation by C-reactive protein via the collagen-like region of C1q and inhibition of these reactions by monoclonal antibodies to C-reactive protein and C1q.
    J Immunol (1991) · PMID:2005402
    No extracted figures yet
    Complement C1q-Targeted Microglial Membrane Camouflaged Nanolipid Carriers for Synaptic Protection in Alzheimer's Disease: A Bioinspired Alectinib Delivery Strategy.
    Nano letters (2026) · PMID:41114949
    No extracted figures yet

    📓 Linked Notebooks (1)

    📓 How does Alectinib, a kinase inhibitor, achieve high-affinity binding to complement protein C1q? — Analysis Notebook
    CI-generated notebook stub for analysis SDA-2026-04-16-gap-pubmed-20260410-095709-4e97c09e. The abstract reports that Alectinib binds C1q with high affinity, but this is mechanistically unexpected sin …
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    KG Entities (2)

    C1QA/C1QB/C1QC, CRP, FCGR1Aneuroinflammation

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    Estimated Development

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    🧪 Falsifiable Predictions

    No explicit predictions recorded yet. Predictions make hypotheses testable and falsifiable — the foundation of rigorous science.

    Knowledge Subgraph (1 edges)

    promoted: Selective C1q-CRP vs. C1q-IgG Axis Inhibition (1)

    C1QA/C1QB/C1QC, CRP, FCGR1Aneuroinflammation

    3D Protein Structure

    🧬 C1QA — PDB 1PK6 Click to expand 3D viewer

    Experimental structure from RCSB PDB | Powered by Mol* | Rotate: click+drag | Zoom: scroll | Reset: right-click

    Source Analysis

    How does Alectinib, a kinase inhibitor, achieve high-affinity binding to complement protein C1q?

    neuroinflammation | 2026-04-16 | completed

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