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Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells
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Genetic Code Expansion in Mammalian Cells Through Quadruplet Codon Decoding.

Yan Chen1, Tianyu Gao1, Xinyuan He2

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 5, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for site-specific protein modification using quadruplet codons in mammalian cells. This genetic code expansion technique allows for the precise insertion of noncanonical amino acids (ncAAs) for advanced biological research.

Keywords:
Four-base codonGenetic code expansionNon-canonical amino acidQuadruplet codonUnnatural amino acid

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • Genetic code expansion allows for site-specific incorporation of noncanonical amino acids (ncAAs) into proteins.
  • Expanding the genetic code beyond triplet codons, such as using quadruplet codons, offers new possibilities for protein engineering.

Purpose of the Study:

  • To provide a protocol for decoding the UAGA quadruplet codon with a ncAA in mammalian cells.
  • To demonstrate a general approach for genetically incorporating ncAAs using engineered aminoacyl-tRNA synthetases (aaRS) and tRNA variants.

Main Methods:

  • Utilizing an engineered aminoacyl-tRNA synthetase (aaRS) and a tRNA variant with an expanded anticodon loop.
  • Developing a protocol for quadruplet codon decoding in mammalian cells.
  • Employing microscopy imaging and flow cytometry for analysis.

Main Results:

  • Successful decoding of the UAGA quadruplet codon with a ncAA in mammalian cells.
  • Demonstration of a generalizable method for genetic incorporation of ncAAs via quadruplet codons.
  • Characterization of ncAA mutagenesis using advanced imaging and flow cytometry techniques.

Conclusions:

  • The developed protocol enables the expansion of the genetic code in mammalian cells using quadruplet codons.
  • This method provides a powerful tool for site-specific protein modification and the study of ncAA mutagenesis.
  • The approach is broadly applicable for advancing protein engineering and synthetic biology applications.