Synthetic mRNAs modified with sulfur atoms boost efficient protein synthesis

Synthetic mRNAs modified with sulfur atoms boost efficient protein synthesis
Phosphorothioate modification of mRNA increases the rate of translation initiation and the molecular designs for a high translation efficiency were optimized. This result provides a useful molecular design guideline for improving the translation quantity by chemical modification of mRNA. Credit: Nagoya University

Since mRNAs play a key role in protein synthesis in vivo, the use of mRNAs as medicines and for in vitro protein synthesis has been desired. In particular, mRNA therapeutics hold the potential for application to vaccine therapy against coronaviruses and are being developed. However, the efficiency of protein production with mRNAs in the natural form is not sufficient enough for certain purposes, including application to mRNA therapeutics. Therefore, mRNA molecules allowing for efficient protein production have been required to be developed.

A ribosome repeats the following three steps to synthesize a protein in vivo using an mRNA as a template ( reaction): 1) Initiation step: A ribosome binds to an mRNA to form a translation initiation complex; 2) Elongation step: The ribosome moves on the mRNA and links amino acids to synthesize a protein; and 3) Termination step: The process concludes, and the ribosome is liberated. In the translation reaction cycle, the initiation step takes the longest time.

Collaborative research by a group of Nagoya University consisting of Professor Hiroshi Abe, Research Assistant Professor Naoko Abe, and graduate student Daisuke Kawaguchi with Yoshihiro Shimizu, a team leader at RIKEN, has succeeded in the development of modified messenger RNAs (mRNAs). The modified mRNA contains sulfur atoms in the place of oxygen atoms of phosphate moieties of natural mRNAs. It is capable of supporting protein synthesis at increased efficiency. They discovered that modified mRNAs accelerated the initiation step of the translation reactions and improved efficiency of protein synthesis by at least 20 times compared with that using natural-form mRNAs.

This method is expected to be used for large-scale synthesis of proteins as raw materials for the production of biomaterials. Moreover, the application of the results obtained in this study to eukaryotic translation systems enables the efficient production of mRNA therapeutics for replacement therapy to contribute to medical treatments. Furthermore, there are virtually no previous reports on the molecular design of highly functional mRNAs; therefore, the successful design achieved in this study can guide a future direction of the molecular design of modified mRNAs.

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More information: Hiroshi Abe et al. Phosphorothioate Modification of mRNA Accelerates Rate of Translation Initiation Providing More Efficient Protein Synthesis, Angewandte Chemie International Edition (2020). DOI: 10.1002/anie.202007111
Provided by Japan Science and Technology Agency (JST)
Citation: Synthetic mRNAs modified with sulfur atoms boost efficient protein synthesis (2020, July 16) retrieved 8 August 2020 from
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