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scientific-skills/ginkgo-cloud-lab/references/cell-free-protein-expression-optimization.md

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+# Cell Free Protein Expression Optimization
+
+**URL:** https://cloud.ginkgo.bio/protocols/cell-free-protein-expression-optimization
+**Status:** Ginkgo Certified
+**Price:** $199/sample (default: $597 for 1 protein x 3 replicates = 3 samples)
+**Turnaround:** 6-11 days
+
+## Overview
+
+Design of Experiment (DoE) approach to expressing protein targets in a proprietary reconstituted E. coli transcription-translation system. Each construct is evaluated in up to 24 reaction conditions per protein, including target-specific additives such as chaperones, disulfide-bond enhancers, and cofactors. Designed for difficult-to-express proteins including membrane proteins and targets with disulfide or cofactor requirements.
+
+## Input
+
+- **DNA sequence** in `.fasta` format
+
+## Output
+
+- **Comparative Yield:** Titer data mapped across all tested variables (lysates, temps, additives)
+- **Purity Profiling:** Target protein vs. background impurities to find highest quality yield
+- **Optimal Conditions:** Overlaid electropherograms pinpointing the exact formulation for a given sequence
+
+## Automated Workflow
+
+### Phase 1 - Reagent Prep
+
+1. Retrieve plates from 4 deg C
+2. Thaw at room temperature
+3. PBS backfill
+
+### Phase 2 - CFPS Reaction Setup & Incubation
+
+1. Retrieve plates from 4 deg C
+2. Dispense lysate
+3. QC plate read
+4. Incubate (shaking or static, condition-dependent)
+
+### Phase 3 - Quantification Prep & Read
+
+1. Dispense PBS
+2. Unseal plate
+3. LabChip quantification
+4. Seal plate
+5. Store at 4 deg C
+
+## Protocol Parameters
+
+- Payloads & Reagents
+- Bravo Stamp
+- HiG Centrifuge
+- Incubation & Storage
+
+## Optimization Variables
+
+The DoE matrix can span up to 24 conditions per protein, varying:
+
+- **Lysate composition** (different E. coli extract formulations)
+- **Temperature** (incubation temperature profiles)
+- **Additives:**
+  - Chaperones (for folding-challenged targets)
+  - Disulfide-bond enhancers (for targets requiring disulfide bridges)
+  - Cofactors (metal ions, coenzymes, prosthetic groups)
+  - Other target-specific supplements
+
+## Ordering
+
+- **Number of Proteins:** configurable
+- **Number of Replicates:** configurable
+- **File Upload:** CSV, Excel, FASTA, TXT, PDF, ZIP
+- **Additional Details:** free-text field for special requirements
+
+## Certification Milestones
+
+- Dry Run Complete
+- Wet Run Complete
+- Biovalidation Complete
+- App Note Complete
+
+## Use Cases
+
+- Optimizing expression of difficult-to-express proteins
+- Membrane protein expression screening
+- Identifying optimal conditions for disulfide-bonded proteins
+- Cofactor-dependent protein expression
+- Systematic exploration of expression parameter space
+- Finding the best formulation before scaling up production