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cell-free-expression

Optimize cell-free protein synthesis yields and troubleshoot expression issues.

11|Updated Mar 4, 2026
Search Tags:#troubleshooting#expression#codon-optimization#cfps#cell-free#disulfide-bond#solubility-tags
One-click install
npx skills add https://github.com/junior1p/ProteinClaw --skill cell-free-expression-junior1p
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: cell-free-expression
Source: https://github.com/junior1p/ProteinClaw/tree/main/skills/cell-free-expression
Command: npx skills add https://github.com/junior1p/ProteinClaw --skill cell-free-expression-junior1p

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides practical guidance to plan, optimize, and troubleshoot cell-free protein synthesis (CFPS) experiments so researchers can improve yields, reduce aggregation, and obtain correctly folded proteins including disulfide-rich and difficult targets.

Core Features & Use Cases

  • System selection guidance: Compare extract types (E. coli, PURE, wheat germ, rabbit reticulocyte, HeLa/CHO) and choose the best system by protein class and cost.
  • Troubleshooting matrix: Targeted fixes for no expression, low yield, aggregation, truncation, and inactive protein with both design and reagent interventions.
  • Codon and 5' UTR design rules: Recommendations for first 30 codons, rare-codon thresholds, GC content targets, and strategies for strategic slow codons to aid folding.
  • Solubility and folding strategies: Tag recommendations (MBP, SUMO, NusA, Trx), temperature regimes, chaperones, and redox conditions for disulfide bond formation.
  • Use Case: Optimize expression of a 25–40 kDa disulfide-rich binder in an E. coli CFPS system by combining codon optimization, MBP fusion, adjusted Mg2+ and redox reagents, and 25°C expression to reduce aggregation.

Quick Start

Use the cell-free-expression skill to optimize a CFPS protocol for a disulfide-rich 25 kDa protein by recommending the extract type, codon/5'UTR adjustments, solubility tag, temperature, and redox buffer conditions.

Frequently Asked Questions about cell-free-expression

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I troubleshoot low yields and aggregation in cell-free protein synthesis?▼

Troubleshoot low cell-free protein synthesis yields by adjusting Mg2+ levels, adding chaperones, lowering expression temperature, or applying solubility tags like MBP to reduce aggregation and improve folding.

What is the best extract system for expressing disulfide-rich proteins in CFPS?▼

E. coli CFPS systems are commonly used for disulfide-rich proteins, requiring optimized redox buffer conditions and specific reagent adjustments to promote correct disulfide bond formation.

How do I optimize codon usage and 5' UTR design for cell-free expression?▼

Optimize cell-free expression codon usage by adjusting the first 30 codons, targeting specific GC content, managing rare-codon thresholds, and incorporating strategic slow codons to aid protein folding.

Which solubility tags work best for difficult targets in cell-free protein expression?▼

MBP, SUMO, NusA, and Trx are effective solubility tags for difficult targets in cell-free protein expression, helping to prevent aggregation and promote proper folding during synthesis.

Why does my CFPS reaction produce truncated protein products?▼

Truncated products in CFPS often result from rare codons, premature stop codons, or insufficient reagent concentrations; address these through codon optimization, sequence verification, and reagent adjustments.

Can I use wheat germ or rabbit reticulocyte extracts instead of E. coli for cell-free expression?▼

Wheat germ, rabbit reticulocyte, and HeLa/CHO extracts are viable alternatives to E. coli CFPS, with system selection depending on your protein class, cost constraints, and specific folding requirements.

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