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Pyrrolysyl-tRNA synthetase (PylRS)/tRNAPyl pairs have revolutionized genetic code expansion, enabling the incorporation of noncanonical amino acids (ncAAs) across all domains of life. This technology facilitates novel applications and the creation of diverse biomolecules.

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Molecular Biology

Background:

  • Genetic code expansion utilizes pyrrolysyl-tRNA synthetase (PylRS)/tRNAPyl pairs.
  • These pairs possess unique properties enabling genetic code reprogramming.
  • The pyrrolysine system has driven significant advances in the field.

Purpose of the Study:

  • To summarize the discovery and properties of the PylRS/tRNAPyl system.
  • To review the development and applications of genetic code expansion using PylRS/tRNAPyl pairs.
  • To discuss strategies for engineering PylRS/tRNAPyl pairs for novel monomer incorporation and multiple ncAAs.

Main Methods:

  • Review of literature on PylRS/tRNAPyl pair discovery and engineering.
  • Analysis of applications in genetic code expansion across different life domains.
  • Examination of strategies for incorporating diverse and multiple noncanonical amino acids (ncAAs).

Main Results:

  • PylRS/tRNAPyl pairs have been successfully developed for genetic code expansion in various organisms.
  • Diverse ncAAs can be incorporated using engineered PylRS/tRNAPyl pairs and orthogonal systems.
  • Multiple distinct ncAAs can be incorporated into proteins using mutually orthogonal PylRS/tRNAPyl pairs.

Conclusions:

  • PylRS/tRNAPyl pairs are foundational for genetic code expansion and reprogramming.
  • The technology enables the synthesis of noncanonical polymers and macrocycles.
  • Future developments promise expanded capabilities for PylRS/tRNAPyl pairs in synthetic biology.