tRNA engineering strategies for genetic code expansion
YouJin Kim1, Suho Cho1, Joo-Chan Kim1
1Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
Frontiers in Genetics
|March 22, 2024
Summary
Optimizing transfer RNA (tRNA) sequences is key to advancing genetic code expansion (GCE) technology. Engineering tRNA enhances unnatural amino acid incorporation and orthogonality for broader GCE applications.
Area of Science:
- Biochemistry
- Molecular Biology
- Synthetic Biology
Background:
- Genetic code expansion (GCE) relies on specific aminoacyl-tRNA synthetase/tRNA pairs for incorporating unnatural amino acids.
- Past GCE advancements primarily focused on improving aminoacyl-tRNA synthetases.
- Recent research emphasizes the critical role of transfer RNA (tRNA) optimization in enhancing GCE efficiency and specificity.
Purpose of the Study:
- To review diverse tRNA engineering strategies for genetic code expansion.
- To provide examples of tRNA optimization in the context of GCE.
- To offer insights for user-friendly implementation of GCE technology through tRNA engineering.
Main Methods:
- Literature review of tRNA engineering techniques applicable to GCE.
- Analysis of studies focusing on tRNA sequence optimization for unnatural amino acid incorporation.
- Compilation of examples demonstrating successful tRNA modifications in GCE systems.
Main Results:
- Tuning tRNA sequences significantly improves unnatural amino acid incorporation efficiency.
- Optimized tRNAs enhance the orthogonality of the aminoacyl-tRNA synthetase/tRNA pair, reducing misacylation.
- Various tRNA engineering approaches can be applied to tailor GCE systems for specific applications.
Conclusions:
- tRNA engineering is a crucial component for advancing genetic code expansion technology.
- Optimizing tRNA sequences is as important as optimizing synthetases for efficient and orthogonal GCE.
- This review provides a foundation for developing more accessible and versatile GCE tools through tRNA manipulation.
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