Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (4): 20240004.doi: 10.7503/cjcu20240004

• Organic Chemistry • Previous Articles     Next Articles

Effect of Metal Ions on the Catalytical Activity of a DMSO-dependent RNA-cleaving DNAzyme

CUI Li1, LI Suhui1, ZHENG Xing1, CHANG Tianjun1(), BING Tao2()   

  1. 1.Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454003,China
    2.Hangzhou Institute of Medicine(HIM),Chinese Academy of Sciences,Hangzhou 310022,China
  • Received:2024-01-02 Online:2024-04-10 Published:2024-02-19
  • Contact: CHANG Tianjun E-mail:changtj@ hpu.edu.cn;bingtao@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(U1704241);the Natural Science Foundation of Zhejiang Province, China(YXD24B0401);the Pioneer and Leading Goose Research and Development Program in Zhejiang Province, China(2023SDYXS0002);the National Health Commission Scientific Research Fund-Zhejiang Province Health Major Science and Technology, China(WKJ-ZJ-2424);the Key Laboratory of Aptamers and Clinical Diagnosis and Treatment in Zhejiang Province, China(2022ASC001)

Abstract:

Engineering RNA-cleaving DNAzymes(RCDs) and RCD-based molecular devices that are highly functional in high content of organic co-solvents may not only expand the ability of DNAs as enzymes, but also promote functional nucleic acids for novel applications. In this work, we have investigated the requirement of divalent metal ions for a dimethyl sulfoxide(DMSO)-dependent RCD(named E3) that we previously reported. The divalent metal ions were proved to be crucial for E3 to function in 35%(volume fraction) DMSO, and the metal ions with the ability to activate E3 followed the order: Zn2+, Mg2+>Fe2+>Pb2+>Mn2+>Co2+. The rate-pH profile of E3 in Mg2+ showed a “bell” shaped curve with a plateau at the pH range from 7.0 to 9.0, yet a sharp peak at pH value of 7.0 in Zn2+. Moreover, both Zn2+ and Mg2+ bound to E3 at a number ratio of 1∶1. We also observed that E3 could be activated by Fe2+ in 35% DMSO, but quickly inactive by the rapid oxidation of Fe2+ to Fe3+. This inactivation of E3could be further rescued by the addition of ascorbic acid. In addition, the catalytic activity of E3 in the presence of Zn2+ or Mg2+ was sharply inhibited with the competition of Cu2+, Ni2+, and Fe3+. These results are helpful for understanding the characterization and catalytical mechanism of the DMSO-dependent RCD.

Key words: RNA-cleaving DNAzyme, Functional nucleic acid, Organic solvent, Metal ion

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