in silico
Phase 1: In Silico Validation
- Objective
- To computationally falsify the hypothesis that Green Chemistry-inspired circuit design reduces ATP burden and increases growth rate, using flux balance analysis (FBA) and stochastic modeling, before any wet-lab investment.
- Estimated cost
- €500-2000
- Estimated duration
- 4-6 weeks
- Success criteria
- FBA-predicted μ increase at 20% ATPM reduction · ≥15% increase in μ (from 0.20 to ≥0.23 h⁻¹) · (Run FBA with ATPM = 6.71 mmol/gDCW/h (20% reduction); record μ)
- Stochastic simulation: q_ATP_circuit reduction · ≥20% reduction for minimal vs. traditional circuit at k_decay = 0.5 min⁻¹ · (Run COPASI simulation; compare ATP consumption per cell per hour)
- Codon optimization: predicted translation rate · ≥1.5-fold increase in translation initiation rate for optimized vs. native sequence · (RBS Calculator output (au))
- Go if
- FBA predicts μ increase ≥15% at ≤20% ATPM reduction AND stochastic simulation shows ≥20% q_ATP_circuit reduction
- No-go if
- FBA predicts μ increase <5% even at 30% ATPM reduction OR stochastic simulation shows <10% q_ATP_circuit reduction
- Pivot if
- FBA predicts μ increase 5-15%: proceed to Phase 2 but with relaxed success criteria (e.g., 10% μ increase target)
- Risks
- FBA model does not capture kinetic effects of mRNA/protein degradationProbability: mediumMitigation: Use stochastic simulation to capture dynamic effects; compare FBA predictions with kinetic model
- DeepCodon predictions may not match experimental realityProbability: mediumMitigation: Validate top 3 optimized sequences in Phase 2; use multiple codon optimization tools (e.g., OPTIMIZER, CodonW)
- Simulation of ppGpp dynamics may be unreliable due to parameter uncertaintyProbability: lowMitigation: Use ensemble modeling with parameter sampling; focus on qualitative trends rather than absolute values