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pH-Responsive Reversible DNA Self-assembly Mediated by Zwitterion

  • Yuhang Dong
  • Xiaorui Pan
  • Feng LiEmail author
  • Dayong YangEmail author
Article
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Abstract

pH-Responsive DNA assembles have drawn growing attentions owing to their great potential in diverse areas. However, pH-responsive motifs are limited to specific DNA sequences and annealing is usually needed for DNA assemblies; therefore, sequence-independent pH-responsive DNA assembly at room temperature is highly desired as a more general way. Here, we propose a reversible pH-responsive DNA assembly strategy at room-temperature using zwitterion, glycine betaine(GB), as charge-regulation molecules. The reversible assembly and disassembly of DNA nanostructures could be achieved by alternatively regulating the acidic and basic environments in the presence of GB, respectively. In an acidic environment, carboxylate group in GB was protonated and GB was positively charged, which facilitated to shield the inherent electrostatic repulsion of DNA strands. Molecular simulation showed that the newly formed carboxyl group in protonated GB could form hydrogen bonds with bases in DNA to promote the assembly of DNA strands. In a basic solution, carboxylate group in GB was deprotonated and GB was neutral, thus inducing the dissociation of DNA assembly.

Keywords

DNA nanotechnology Dynamic assembly pH responsiveness Zwitterion 

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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2020

Authors and Affiliations

  1. 1.Frontier Science Center for Synthetic Biology, Key Laboratory of Systems BioengineeringMinistry of Education, School of Chemical Engineering and Technology, Tianjin UniversityTianjinP. R. China

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