Upgrading aminoacyl-tRNA synthetases for genetic code expansion

Area of Science:

• Synthetic biology
• Biochemistry
• Molecular biology

Background:

• Genetic code expansion enables site-specific protein synthesis with non-canonical amino acids.
• Over 200 diverse amino acids can be incorporated into proteins across various organisms.
• Aminoacyl-tRNA synthetases are repurposed to ligate non-canonical amino acids to tRNAs.

Purpose of the Study:

• To summarize progress and challenges in developing selective and efficient aminoacyl-tRNA synthetases.
• To highlight advancements in incorporating diverse non-canonical amino acids into proteins.
• To address limitations in simultaneous multi-amino acid incorporation.

Main Methods:

• Review of current literature on aminoacyl-tRNA synthetase engineering.
• Analysis of strategies for expanding the genetic code.
• Discussion of challenges in incorporating non-l-α-amino acids.

Main Results:

• Significant progress in expanding the repertoire of incorporable non-canonical amino acids.
• Development of strategies for site-specific amino acid incorporation.
• Identification of limitations in simultaneous and diverse amino acid incorporation.

Conclusions:

• Further development of aminoacyl-tRNA synthetases is crucial for advancing genetic code expansion.
• Overcoming challenges in selectivity and efficiency is key for broader applications.
• Future research aims to enable simultaneous incorporation of multiple and unusual amino acids.