高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (3): 20220246.doi: 10.7503/cjcu20220246

• 研究论文 • 上一篇    下一篇

催化RNA切割反应的苏糖核酸酶的表征及在切割microRNA中的应用

孙昕, 高明媚, 张泽, 王海燕, 于涵洋()   

  1. 南京大学配位化学国家重点实验室,现代工程与应用科学学院,化学和生物医药创新研究院,江苏省人工功能材料重点实验室,南京 210023
  • 收稿日期:2022-04-14 出版日期:2023-03-10 发布日期:2023-03-14
  • 通讯作者: 于涵洋 E-mail:hanyangyu@nju.edu.cn
  • 作者简介:第一联系人:共同第一作者.
  • 基金资助:
    国家自然科学基金(21977046)

Characterization of an RNA-Cleaving TNA Enzyme and Application in MicroRNA Cleavage

SUN Xin, GAO Mingmei, ZHANG Ze, WANG Haiyan, YU Hanyang()   

  1. State Key Laboratory of Coordination Chemistry,College of Engineering and Applied Sciences,Chemistry and Biomedicine Innovation Center,Jiangsu Key Laboratory of Artificial Functional Materials,Nanjing University,Nanjing 210023,China
  • Received:2022-04-14 Online:2023-03-10 Published:2023-03-14
  • Contact: YU Hanyang E-mail:hanyangyu@nju.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21977046)

摘要:

对一条催化RNA切割反应的苏糖核酸(TNA)酶6-29进行了系统的生物化学表征, 探究了TNA酶6-29对RNA底物的序列要求, 测定了TNA酶6-29催化反应的酶学常数, 并进一步开发了TNA酶6-29在切割 microRNA中的应用. 研究结果表明, TNA酶6-29能够耐受底物结合臂和切割位点的多种变化, 具有良好的底物序列通用性; TNA酶6-29能够在镁离子和锰离子等多种金属离子的存在下发挥催化活性, 并且能够催化多个底物分子发生切割反应, 具有酶的典型特征. 基于TNA酶6-29良好的普适性, 进一步展示了TNA酶6-29可以切割不同序列microRNA分子. 本文结果表明, 具有催化活性的TNA是一种有潜力的分子工具, 有望进一步应用于疾病诊疗领域.

关键词: 核酸化学, 非天然核酸, 苏糖核酸, 核酶, 功能核酸

Abstract:

In this work, we systematically characterized a previously identified RNA-cleaving threose nucleic acid(TNA) enzyme 6-29 including the substrate sequence requirement and reaction rate constant, and further demonstrated its application in microRNA cleavage. It was revealed that 6-29 possessed a relatively broad substrate sequence scope and was able to cleave RNAs with distinct sequences and cleavage sites. Moreover, TNA enzyme 6-29 remained active in the presence of a variety of metal ions such as Mg2+ and Mn2+, and functioned under a multi-turnover condition. Lastly, it was demonstrated that 6-29 catalysed site-specific cleavage reactions on severaldifferent microRNA sequences. This work highlights catalytic TNA as a promising molecular tool, which could be developed to act as a key functional element in disease theranostics.

Key words: Nucleic acid chemistry, Xenobiological nucleic acid, Threose nucleic acid, Ribozyme, Functional nucleic acid

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