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Recent advances in the expanding genetic code.

Michael L Pigula1, Peter G Schultz1

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Scientists are expanding the genetic code beyond 20 standard amino acids, enabling the creation of novel proteins with enhanced functions. This breakthrough allows for precise engineering of enzymes and biotherapeutics in living systems.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The central dogma of biology traditionally relies on 20 canonical amino acids.
  • Limited functional diversity of canonical amino acids restricts protein capabilities.

Purpose of the Study:

  • To review recent advancements in incorporating noncanonical amino acids (ncAAs) into proteins.
  • To highlight the potential of ncAAs for protein engineering and therapeutic development.

Main Methods:

  • Site-specific incorporation of ncAAs using unique codons.
  • High-level mammalian and eukaryotic expression systems for ncAA-containing proteins.
  • Encoding of non-alpha-amino acid building blocks.

Main Results:

  • Hundreds of ncAAs with novel properties can now be site-specifically incorporated into proteins.
  • Successful high-level expression of ncAA-modified proteins in mammalian systems.
  • Demonstrated utility in studying protein function and engineering novel biotherapeutics.

Conclusions:

  • Expansion of the genetic code with ncAAs offers unprecedented opportunities in protein science.
  • Future research directions include further expanding the repertoire of ncAAs and their applications.
  • ncAA technology holds significant promise for advancing biotechnology and medicine.