2. Academic Validation
  3. RNase A activity analysis and imaging using label-free DNA-templated silver nanoclusters

RNase A activity analysis and imaging using label-free DNA-templated silver nanoclusters

  • Talanta. 2020 Mar 1:209:120512. doi: 10.1016/j.talanta.2019.120512.
Wenya Dang 1,  Ruxin Luo 1,  Jialong Fan 1,  Ying Long 1,  Chunyi Tong 1,  Feng Xiao 1,  Xiang Xiong 2,  Bin Liu 3
Affiliations

Affiliations

  • 1 College of Biology, Hunan University, Changsha, 410082, China.
  • 2 Department of Burn and Plastic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China. Electronic address: xiongxiang_prs@csu.edu.cn.
  • 3 College of Biology, Hunan University, Changsha, 410082, China. Electronic address: binliu2001@hotmail.com.
PMID: 31892040 DOI: 10.1016/j.talanta.2019.120512
Abstract

A label-free, ultra-sensitive and turn-on method for detecting RNase A has been developed using enhanced DNA-templated silver nanoclusters (DNA-AgNCs) as the fluorescence probe. In this system, an RNA strand, which can perfectly hybridize with DNA template of nanocluster synthesis, was applied to lock the fluorescent signal of DNA-AgNCs by forming an RNA/DNA duplex. Meanwhile, the hybridized RNA/DNA duplex was used as the substrate of RNase A. The fluorescence signal of AgNCs was restored due to the degradation of RNA by RNase A. From the fluorescence signal change of this system caused by RNase A, it was found that the fluorescence signal showed a positive linear relation with RNase A concentration in the range from 0.2 pg/μL to 10 pg/μL with a detection limit of 0.098 pg/μL. Except for potential inhibitor screening and the kinetic study of this Enzyme, this strategy was further used for monitoring dynamic change of RNase A in living cells successfully. In summary, the simple and sensitive method for RNase A assay can be hopefully used for drug screening in vitro and in vivo.

Keywords

Cell imaging; DNA-AgNCs; Fluorescence; Label-free; RNase A.

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