Versatility of Synthetic tRNAs in Genetic Code Expansion

Area of Science:

• Molecular Biology
• Synthetic Biology
• Biochemistry

Background:

• Transfer RNAs (tRNAs) are essential molecules in all life forms, facilitating amino acid delivery for protein synthesis.
• tRNAs undergo extensive processing, structuring, and modification for accurate function.
• Engineered tRNAs are critical for synthetic biology, enabling the creation of proteins with non-canonical amino acids (ncAAs).

Purpose of the Study:

• To review the current status of selenocysteine (Sec)- and pyrrolysine (Pyl)-based translation systems.
• To highlight the importance of suppressor tRNAs in genetic code expansion for ncAA incorporation.
• To discuss the unique adaptations and selection techniques for tRNAs in these specialized translation systems.

Main Methods:

• Review of existing literature on tRNA biology and genetic code expansion.
• Comparative analysis of selenocysteine and pyrrolysine translation systems.
• Discussion of tRNA engineering challenges and selection strategies.

Main Results:

• Suppressor tRNAs are central to efficient ncAA incorporation.
• Selenocysteine and pyrrolysine translation systems have distinct tRNA requirements.
• tRNA adaptations are dictated by the specific needs of each translation system.

Conclusions:

• Understanding tRNA adaptations is crucial for advancing synthetic biology and genetic code expansion.
• The unique features of Sec- and Pyl-tRNAs offer opportunities for precise protein engineering.
• Tailored selection methods are necessary to optimize synthetic tRNA variants for specific translation systems.