Protein Expression with Biosynthesized Noncanonical Amino Acids.
Methods Mol Biol
; 2676: 87-100, 2023.
Article
in En
| MEDLINE
| ID: mdl-37277626
ABSTRACT
Natural proteins are normally made by 20 canonical amino acids. Genetic code expansion (GCE) enables incorporation of diverse chemically synthesized noncanonical amino acids (ncAAs) by orthogonal aminoacyl-tRNA synthetase (aaRS)/tRNA pairs using nonsense codons, which could significantly expand new functionalities of proteins in both scientific and biomedical applications. Here, by hijacking the cysteine biosynthetic enzymes, we describe a method combining amino acid biosynthesis and GCE to introduce around 50 structurally novel ncAAs into proteins by supplementation of commercially available aromatic thiol precursors, thus eliminating the need to chemically synthesize these ncAAs. A screening method is also provided for improving the incorporation efficiency of a particular ncAA. Furthermore, we demonstrate bioorthogonal groups, such as azide and ketone, that are compatible with our system and can be easily introduced into protein for subsequent site-specific labeling.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Amino Acids
/
Amino Acyl-tRNA Synthetases
Language:
En
Journal:
Methods Mol Biol
Year:
2023
Type:
Article
Affiliation country:
China