Quantum Precision
for Drug Discovery
Sector-audited electronic landscape classification for metalloenzyme active sites — in days, across Fe, Zn, and Cu systems, with reproducible multi-seed validation.
FePorphyrin FeII ls · Zn_CA2 minimal · Zn_CA2 full imidazole · Cu_SOD_minimal · Zn square-planar scaffold control
The model validity
problem in drug discovery
Drug discovery teams already have ways to rank compounds. What they often lack is a way to verify that the metal-centered target model itself is trustworthy enough to rank against. A model that looks converged can still sit in the wrong electronic basin — producing rankings and SAR conclusions that are internally consistent but built on the wrong mechanistic foundation.
Prometheus classifies that question explicitly — before it propagates into synthesis decisions.
Most tools optimize on top of models they should not trust.
Prometheus works one layer earlier.
Drug programs around metalloproteins often fail not because the chemistry was wrong, but because the electronic model underpinning the target was never validated. Teams spend weeks or months optimizing compounds, building SAR narratives, and commissioning assays — against a metal-center model that was unstable, multi-basin, or too truncated to support the conclusions drawn from it. Prometheus classifies that model before the chemistry budget is committed.
The result is not a faster drug. It is fewer false mechanistic leads, fewer wasted synthesis cycles, and faster prioritization of compounds and target-state models that are genuinely decision-grade.
The investable wedge is not "we simulate everything faster." It is: we prevent expensive programs from optimizing against the wrong electronic story. Today, most computational tools rank candidates as if the target picture were already settled. Prometheus works upstream — on whether the target-state model itself is decision-grade. That removes a category of failure that no existing tool addresses.
Prometheus fits between target model construction and ligand or perturbation screening. It answers: is this a valid model for decision-making? Is this target state robust? Will small perturbations preserve the regime or flip the electronics? Are we screening compounds against something coherent, or against an artifact? That is extremely legible to a team that has lost months to a false mechanistic lead.
🛡 Three Expensive Failure Modes Prometheus Reduces
These are not edge cases. They are the reason metalloenzyme programs routinely run longer and cost more than anticipated. Each one is addressable earlier than it typically gets addressed today.
False mechanistic commitment
Teams spend months on a story built on the wrong electronic state. The model converged — it just converged to the wrong basin. The downstream SAR, assay design, and compound prioritization all drift from the start.
Prometheus reduces this by validating whether the modeled state is reproducible and sector-coherent before chemistry begins.Screening against artifacts
Thousands of compounds can be ranked against a metal-center model that is truncated, unstable, or multi-basin in a way the standard workflow never surfaces. The hits look real. The scaffold was the problem.
Prometheus classifies the model before large-scale screening — catching scaffold artifacts and fragment inadequacy early.Late discovery of target instability
Programs often find too late that a perturbation — a protonation change, a redox shift, a ligand substitution — changes the active-site electronics so much that earlier SAR no longer transfers. The series has to be restarted.
Prometheus maps when perturbations preserve regime versus induce selection into a new electronic family — before the medicinal chemistry is designed.📂 Four Categories That Matter Commercially
Each category has a different commercial implication. Prometheus has demonstrated the ability to distinguish all four — across Fe, Zn, and Cu biological systems validated with multiple independent seeds.
Decision-grade target models
Sector-clean, reproducible, single-family. Classification survives scaffold enrichment from donor-only fragment to full imidazole coordination environment.
Executive translation: Prometheus identifies target models robust enough to support downstream screening with confidence. You know what you are optimizing against.
Harder systems that are still trustworthy
Broader ensemble than closed-shell controls, but still sector-clean and single-family. Open-shell does not mean unusable — it means the bar is higher and Prometheus can still clear it.
Executive translation: Prometheus is not limited to easy closed-shell cases. It can classify realistic open-shell metal centers and tell you when they are still trustworthy enough to guide work.
Systems that look simple but are genuinely ambiguous
Sector-clean but multiple competing orbital families. Not a bad run — an intrinsically ambiguous scaffold. Without detection, this becomes the foundation for a misleading screening campaign.
Executive translation: Prometheus flags targets where the electronic landscape is genuinely multi-basin before teams over-interpret a single optimized state and build chemistry around it.
Models too truncated to support any conclusion
Sector escape or spin escalation despite strong enforcement. The fragment is electronically insufficient — any result would be an artifact. Most tools never surface this; they just return a number.
Executive translation: Prometheus tells you when a model should not be used for decision-making at all. That is the most commercially valuable thing a quality-control tool can say.
⚡ The Challenge Standard Methods Cannot Fully Resolve
The active sites of P450s, SOD, carbonic anhydrase, and many other drug targets contain transition metals with electronic regimes that can be difficult to classify reliably using conventional workflows alone. When the target-state model is wrong, downstream ranking and optimisation can drift onto the wrong mechanistic story.
The gap in current workflows
Standard simulation finds the lowest energy state — it does not characterise the full set of accessible electronic configurations, or detect whether the model is sitting in the correct basin at all. For open-shell metallocenters, that gap matters.
What Prometheus adds
A reproducible, sector-audited ensemble sweep that classifies the electronic landscape — stable, coherent open-shell, multi-basin, or model-pathologic — before any synthesis decision is made. Not a replacement for existing workflows. A quality-control layer on top of them.
📐 The Prometheus Classification System
Prometheus does not merely find energy minima. It sorts metallocenters into mechanistically distinct regimes — and identifies when a fragment model is too truncated to support a trustworthy classification.
Rigid Stability
Low ensemble dispersion, single-family basin, sector-clean across all seeds. The model is decision-grade and reproducible.
typically sub-kcal/mol σCoherent Open-Shell
Broader ensemble dispersion than closed-shell controls, but still sector-clean and single-family across seeds. Characteristic of realistic open-shell transition-metal targets.
broader but still coherentMulti-Basin
Sector-clean but multiple competing orbital families. Scaffold geometry is the causal variable — not sector contamination. Indicates a more complex electronic environment.
large dispersion / multiple familiesModel Pathology
Sector escape or spin escalation despite strong enforcement. Fragment model is insufficient to support a trustworthy landscape classification.
engineering constraintLocked benchmark and diagnostic
canonical results
| System | Metal / Config | σ (kcal/mol) | Seeds | Classification | Status |
|---|---|---|---|---|---|
| FePorphyrin_FeII ls P450 / heme model | Fe²⁺ d⁶ low-spin | 0.3375 | 5 | Rigid Stability | ● LOCKED |
| Zn_CA2 minimal Carbonic anhydrase | Zn²⁺ d¹⁰ tetrahedral | 0.0933 | 9 | Rigid Stability | ● LOCKED |
| Zn_CA2 imidazole Full His coordination shell | Zn²⁺ d¹⁰ + 3 imidazole | 0.4367 | 5 | Rigid Stability | ● LOCKED |
| Cu_SOD_minimal Superoxide dismutase | Cu²⁺ d⁹ doublet | 1.7035 | 5 | Coherent open-shell | ● LOCKED |
| Zn_squareplanar Scaffold geometry control | Zn²⁺ d¹⁰ D4h artificial | 43.29 | 5 | Multi-basin (scaffold) | ◆ LOCKED DIAGNOSTIC |
All results: 20-qubit penalized VQE · LANL2DZ basis · GPU-accelerated (L40S) · Full sector audit per run
🔬 How It Works
A quality-control layer, not an optimizer. Prometheus answers a different question from standard simulation: is this electronic model trustworthy enough to guide chemistry?
Fragment model construction
First-shell metallocenter geometry built from crystallographic references. Each atom verified; engine patched and backed up before any run.
Penalized VQE multi-seed sweep
Independent VQE optimisations across multiple seeds with N-sector and Sz-sector enforcement. 20-qubit operating point validated across all targets.
Sector audit per seed
Every run: full energy decomposition, ⟨N⟩, ⟨Sz⟩, dom_p, dominant bitstring. Penalty contributions explicitly separated from physical energy.
Landscape classification
σ across seeds, basin count, dominant determinant consistency. Result locked only when all metrics are internally consistent across the full ensemble.
Realism-survival testing
Classification re-run with an enriched scaffold. For Zn_CA2: donor-only minimal → full imidazole coordination shell. Same regime confirmed. Not a toy-fragment result.
What makes a result trustworthy?
Every locked Prometheus result meets all five criteria simultaneously — not a subset.
"Prometheus is not merely finding answers. It is identifying when a fragment model is too truncated to support trustworthy landscape classification."
Research Roadmap
The Zn and Fe biological benchmarks are closed. The Cu²⁺ SOD branch is locked. The next step — a controlled perturbation panel — is where Prometheus becomes a regime-mapping tool, not just a classifier.
✓ Complete
Biological Benchmark Ladder
Four locked results across Fe, Zn, and Cu active sites. Classification ladder established. Realism-survival extension confirmed for the Zn branch — minimal fragment and full imidazole scaffold give identical regime classification.
◆ Active
Cu²⁺ SOD Perturbation Panel
One controlled coordination-shell perturbation on the locked Cu_SOD_minimal benchmark. Goal: show when a medicinally relevant metal center preserves its electronic regime under perturbation — and when it does not.
○ Next
Partner Target Classification
Apply the validated Prometheus workflow to partner-nominated metalloenzyme targets and deliver a sector-audited landscape report: stable, coherent open-shell, multi-basin, or model-pathologic.
Stop optimizing against models you haven't validated.
Prometheus is available for a small number of partner engagements in 2026. If your program involves a metal-centered target and you need to know whether the working electronic model is stable, coherent, multi-basin, or too truncated to trust — before you commit to large-scale screening or medicinal chemistry — we should talk.
Typical engagement: sector-audited landscape report for your target system, delivered in days.