Codon Optimizer

Optimize codon usage for protein expression in E. coli, yeast, human, and other expression systems

Optimization Parameters

What is Codon Optimization?

Codon optimization replaces rare codons with frequently used synonymous codons for the target organism. Different organisms prefer different codons for the same amino acids. Optimizing codon usage can dramatically improve protein expression levels by matching the host organism's tRNA pool and avoiding translation bottlenecks.

How to Use This Optimizer

Optimize your sequence:

  1. Paste coding DNA sequence (must be in frame)
  2. Select target expression organism
  3. Choose optimization strategy
  4. Optional: avoid restriction enzyme sites
  5. View statistics (codons changed, GC content)
  6. Download or copy optimized sequence

When to Use Codon Optimization

This tool is useful when you need to:

  • Express heterologous proteins in E. coli
  • Improve protein yield in yeast systems
  • Optimize for mammalian cell expression
  • Remove rare codons causing stalling
  • Prepare synthetic genes for cloning
  • Improve translation efficiency

Example Input

Unoptimized sequence with rare codons:

ATGAGGCTAAGCTTACGATATCCAGGACGCT...
(Contains rare codons like AGG, ATA, CGT)

Original sequence may have poor expression

Example Output (E. coli)

Optimized sequence with preferred codons:

ATGCGTCTGAGCCTGCGTATCCCGGATGCC...
(Rare codons replaced with E. coli preferred)

Same protein, better expression potential

FAQ

Q: Does optimization change the protein sequence?
A: No, synonymous codons code for the same amino acids. Protein stays identical.

Q: Which organism should I choose?
A: Choose the organism where you'll express the protein (E. coli, yeast, CHO, etc.).

Q: What is GC content?
A: Percentage of G and C bases. Extreme values can affect expression.