title: Nanoparticles-free fluorescence anisotropy amplification assay for detection of RNA nucleotide-cleaving DNAzyme activity.
abstract: Fluorescence anisotropy is a homogeneous, sensitive, ratiometric, and real-time analytical technology. However, it is a great challenge to produce a large fluorescence anisotropy change upon the presence of target small molecules without nanoparticles-dependent amplification. This work reports a nanoparticle-free and multiple G-enhanced fluorescence anisotropy assay for detection of DNAzyme activity. A Pb(2+)-dependent GR-5 DNAzyme was used as a model. We hybridized the rA-cleavable substrate strand containing a TMR label at the 5'-end with the DNAzyme strand containing an extended three G bases at the 3'-end. By this design, we demonstrate that both fluorescence quenching and the enhanced DNAzyme activity contribute to a Pb(2+)-induced large fluorescence anisotropy change (|Δr| = 0.168). The limit of detection for Pb(2+) is estimated to be about 100 pM with a dynamic range from 200 pM to 100 nM. The interference from the other nine divalent metal ions of 1000-times excess amount is negligible. Moreover, we show an extended assay for evaluation of the interactions of Pb(2+) with cysteine and glutathione by the detection of GR5 DNAzyme activity. Collectively, we developed a novel fluorescence anisotropy amplification assay, enabling us to detect DNAzyme activity and associated cofactors and inhibitors and to characterize the Pb(2+)-chelation capability of free thiols.
authors: †State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
authors: Dapeng
authors: D
authors: Zhang
authors: ‡School of Medicine and Life Sciences, University of Jinan-Shangdong Academy of Medical Sciences, Jinan 250062, People's Republic of China.
authors: Rong
authors: R
authors: Fu
authors: †State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
authors: Qiang
authors: Q
authors: Zhao
authors: ‡School of Medicine and Life Sciences, University of Jinan-Shangdong Academy of Medical Sciences, Jinan 250062, People's Republic of China.
authors: Haiqin
authors: H
authors: Rong
authors: †State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
authors: Hailin
authors: H
authors: Wang
mesh_terms: D021881:DNA, Catalytic / Q000032:analysis* / Q000378:metabolism; D005454:Fluorescence Polarization; D053758:Nanoparticles / Q000737:chemistry; D012313:RNA / Q000737:chemistry* / Q000378:metabolism
chemical_list: D021881:DNA, Catalytic; D012313:RNA