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Updated: May 2, 2026

Nitropeptide Profiling and Identification Illustrated by Angiotensin II
Published on: June 16, 2019
Structural basis of improved second-generation 3-nitro-tyrosine tRNA synthetases
Richard B Cooley1, Jessica L Feldman, Camden M Driggers
1Department of Biochemistry and Biophysics, Oregon State University , 2011 Agriculture and Life Sciences Building, Corvallis, Oregon 97331, United States.
Researchers improved the efficiency of incorporating noncanonical amino acids (ncAAs) like nitrotyrosine into proteins. This advancement in genetic code expansion enhances the study of diseases linked to elevated nitrotyrosine levels.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- Genetic code expansion enables site-specific incorporation of noncanonical amino acids (ncAAs) into proteins.
- Low ncAA incorporation efficiency limits the utility of this technology.
- Elevated cellular nitrotyrosine (nitroTyr) levels are implicated in human diseases.
Purpose of the Study:
- To investigate the origins of improved nitroTyr incorporation efficiency in second-generation aminoacyl-tRNA synthetases (RS).
- To elucidate the molecular basis for enhanced nitroTyr-RS efficiencies using crystal structures.
- To understand how selection strategies impact ncAA-RS efficiency.
Main Methods:
- Development of second-generation aminoacyl-tRNA synthetases (RS) for nitroTyr incorporation.
- Crystallographic analysis of highly efficient nitroTyr-RS.
- Comparative analysis of selection strategies on mutant libraries.
Main Results:
- Second-generation nitroTyr-RSs achieved approximately tenfold greater nitroTyr incorporation efficiency compared to previous methods.
- Crystal structures revealed active sites in second-generation RSs more compatible with Tyr binding.
- A modified selection strategy on an existing mutant library dramatically improved nitroTyr-RS efficiencies.
Conclusions:
- Optimized selection protocols are crucial for enhancing ncAA-RS efficiencies.
- Improved nitroTyr-RSs advance the study of nitroTyr's role in human disease.
- This work highlights the potential for significant improvements in genetic code expansion technologies.
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