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Reassignment of sense codons in vivo
A James Link1, David A Tirrell
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Methods (San Diego, Calif.)
|August 4, 2005
Summary
Genetic codon reassignment enables assigning new amino acids to DNA codes in E. coli. This protein engineering technique expands the building blocks for novel biomolecules.
Area of Science:
- Molecular Biology
- Biochemistry
- Synthetic Biology
Background:
- The standard genetic code utilizes 61 sense codons for 20 canonical amino acids.
- Reassigning codons allows for the incorporation of non-canonical amino acids (ncAAs) into proteins.
- This expands the functional repertoire of proteins beyond natural limitations.
Purpose of the Study:
- To summarize advances in codon reassignment for incorporating ncAAs.
- To provide detailed protocols for achieving codon reassignment in model organisms.
- To highlight the impact of codon reassignment on protein engineering and bioorganic chemistry.
Main Methods:
- Manipulation of the cellular protein synthesis machinery in model organisms like Escherichia coli.
- Control of intracellular amino acid pools.
- Engineering of host aminoacyl-tRNA synthetase activity to recognize and charge tRNAs with ncAAs.
Main Results:
- Successful reassignment of sense codons to a diverse range of ncAAs.
- Demonstration of ncAAs incorporation under standard recombinant protein expression conditions.
- Enabling novel protein structures and functions through expanded amino acid alphabets.
Conclusions:
- Codon reassignment is a powerful tool for protein engineering.
- This technology facilitates advances in bioorganic chemistry by creating novel biomolecules.
- Detailed protocols are provided for researchers to implement codon reassignment strategies.