Volume 63, Issue 13 e202317334
Research Article

Enzymatic Synthesis of TNA Protects DNA Nanostructures

Bohe Qin

Bohe Qin

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

These authors contributed equally to this work.

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Qi Wang

Qi Wang

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

These authors contributed equally to this work.

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Yuang Wang

Yuang Wang

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

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Feng Han

Feng Han

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

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Haiyan Wang

Haiyan Wang

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

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Shuoxing Jiang

Corresponding Author

Shuoxing Jiang

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

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Hanyang Yu

Corresponding Author

Hanyang Yu

State Key Laboratory of Coordination Chemistry, Department of Biomedical Engineering, College of Engineering and Applied Sciences, Chemistry and Biomedicine Innovation Center (ChemBIC), Nanjing University, Nanjing, Jiangsu, 210023 China

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First published: 07 February 2024
Citations: 2

Graphical Abstract

Terminal deoxynucleotidyl transferase (TdT) accepts threose nucleic acid (TNA) nucleotide substrates, and catalyzes de novo synthesis of TNA on the 3’ ends of DNA oligonucleotides. The TNA extension protects DNAs from nuclease digestion, and the DNA-TNA chimeras are used directly as staple strands in the self-assembly of DNA origami nanostructures (DONs). The TNA-shielded DONs are more biologically stable under the physiological environment.

Abstract

Xeno-nucleic acids (XNAs) are synthetic genetic polymers with improved biological stabilities and offer powerful molecular tools such as aptamers and catalysts. However, XNA application has been hindered by a very limited repertoire of tool enzymes, particularly those that enable de novo XNA synthesis. Here we report that terminal deoxynucleotide transferase (TdT) catalyzes untemplated threose nucleic acid (TNA) synthesis at the 3’ terminus of DNA oligonucleotide, resulting in DNA-TNA chimera resistant to exonuclease digestion. Moreover, TdT-catalyzed TNA extension supports one-pot batch preparation of biostable chimeric oligonucleotides, which can be used directly as staple strands during self-assembly of DNA origami nanostructures (DONs). Such TNA-protected DONs show enhanced biological stability in the presence of exonuclease I, DNase I and fetal bovine serum. This work not only expands the available enzyme toolbox for XNA synthesis and manipulation, but also provides a promising approach to fabricate DONs with improved stability under the physiological condition.

Conflict of interests

H. Y., B. Q., Q. W. and S. J. have filed a patent regarding the preparation of TNA-modified DNAs using TdT-catalyzed reactions and the use of such chimeric TNA-DNAs in various applications.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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