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Engineering enzyme activity using an expanded amino acid alphabet.

Zachary Birch-Price1, Christopher J Taylor1, Mary Ortmayer1

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Summary

Enzyme engineering is enhanced by incorporating non-canonical amino acids (ncAAs) using an expanded genetic code. This allows for novel protein functions and catalytic mechanisms beyond nature's 20 amino acids.

Keywords:
directed evolutiongenetic code expansionnon-canonical amino acids

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Enzyme design is limited by the 20 canonical amino acids in nature's genetic alphabet.
  • Non-canonical amino acids (ncAAs) offer a way to expand protein functionality.
  • Genetic code expansion enables site-selective incorporation of ncAAs.

Purpose of the Study:

  • To highlight how expanded amino acid repertoires open new avenues in enzyme design and engineering.
  • To review the applications of ncAAs in probing biological mechanisms and augmenting enzyme function.
  • To discuss the potential of embedding novel catalytic mechanisms using ncAAs.

Main Methods:

  • Utilizing genetic code expansion technology for site-selective ncAA incorporation.
  • Reviewing studies that demonstrate the use of ncAAs in protein engineering.
  • Analyzing the impact of ncAAs on enzyme function and catalysis.

Main Results:

  • Hundreds of structurally diverse ncAAs are now available for protein engineering.
  • ncAAs have been successfully used to probe biological mechanisms and enhance enzyme function.
  • ncAAs enable the creation of new catalytic mechanisms in protein active sites.

Conclusions:

  • The incorporation of ncAAs provides powerful tools for enzyme design and engineering.
  • Advances in genetic code expansion will further establish ncAA incorporation in biocatalysis.
  • ncAA technology offers solutions for challenges in creating novel enzymatic functions.