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An allosteric switch-based hairpin for label-free chemiluminescence detection of ribonuclease H activity and inhibitors

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Abstract

To assay enzyme activities and screen its inhibitors, we demonstrated a novel label-free chemiluminescent (CL) aptasensor for the sensitive detection of RNase H activity based on hairpin technology. The specific hairpin structure was a DNA–RNA chimeric strand, which contained a streptavidin aptamer sequence and a blocked RNA sequence. RNase H could specifically recognize and cleave the RNA sequence of the DNA–RNA hybrid stem, liberating the streptavidin aptamer which could be accumulated by streptavidin-coated magnetic microspheres (SA-MP). Then the CL signal was generated due to an instantaneous derivatization reaction between the specific CL reagent 3,4,5-trimethoxyphenyl-glyoxal (TMPG) and the guanine (G) nucleotides in the SA aptamer. This novel assay method exhibited a good linear relationship in the range of 0.1–10 U mL−1 under the optimized conditions. Our results suggested that the developed system was a promising platform for monitoring the RNase H activity and showed great potential in biomedical studies and drug screening.

Graphical abstract: An allosteric switch-based hairpin for label-free chemiluminescence detection of ribonuclease H activity and inhibitors

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Publication details

The article was received on 18 Oct 2018, accepted on 16 Dec 2018 and first published on 18 Dec 2018


Article type: Paper
DOI: 10.1039/C8AN02006J
Citation: Analyst, 2019, Advance Article
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    An allosteric switch-based hairpin for label-free chemiluminescence detection of ribonuclease H activity and inhibitors

    Y. Zhou, J. Zhang, Q. Jiang and J. Lu, Analyst, 2019, Advance Article , DOI: 10.1039/C8AN02006J

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