Ultrasensitive DNAzyme-Based Ca2+ Detection Boosted by Ethanol and a Solvent-Compatible Scaffold for Aptazyme Design

Chembiochem : a European Journal of Chemical Biology
Tianmeng YuJuewen Liu

Abstract

Functional DNA includes aptamers and DNAzymes, and metal ions are often important for achieving the chemical functions of such DNA. Biosensors based on functional DNA have mainly been tested in aqueous buffers. By introducing organic solvents with much lower dielectric constants, the interaction between metal ions and DNA can be significantly enhanced, and this might affect the performance of DNA-based biosensors. In this work, the effect of ethanol on the activity of the EtNa DNAzyme was studied for Ca2+ detection. With 30 % ethanol, the sensor has a detection limit of 1.4 μm Ca2+ , which is a 16-fold improvement relative to that in water. This EtNa DNAzyme is unique because other tested DNAzymes are all inhibited by 50 % ethanol. Finally, by using the EtNa DNAzyme as a scaffold, the adenosine monophosphate (AMP) aptamer was inserted to construct an aptazyme, which allowed the measurement of AMP in ethanol. In summary, this study has reported the most sensitive DNA-based sensor for Ca2+ , and its sensitivity and selectivity can approach those of proteins or small-molecule ligands. This work also provides a way to measure aptamer binding in organic solvents.

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Citations

Mar 15, 2018·Chembiochem : a European Journal of Chemical Biology·Tianmeng YuJuewen Liu
Nov 13, 2019·Chemistry, an Asian Journal·Kristian Le VayHannes Mutschler
Oct 22, 2020·Sensors·Imogen Heaton, Mark Platt
Jan 22, 2021·Biosensors & Bioelectronics·Ioana CozmaYingfu Li
Jul 16, 2019·Current Opinion in Chemical Biology·Marcel Hollenstein
May 1, 2021·Chembiochem : a European Journal of Chemical Biology·Tianjun ChangYingfu Li
Jul 16, 2021·Food Science & Nutrition·Mingcan QinShujun Wang
Jul 15, 2021·Advanced Science·Shasha LuXiurong Yang
Jul 7, 2021·Chemical Society Reviews·Erin M McConnellYingfu Li
Sep 25, 2019·ACS Sensors·Byunghwa KangSeung Soo Oh
Oct 14, 2021·Chembiochem : a European Journal of Chemical Biology·Roger M BialyJohn D Brennan
Oct 20, 2021·Chemistry, an Asian Journal·Yuqing LiJuewen Liu

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