Facile and diverse logic circuits based on dumbbell DNA-templated fluorescent copper nanoclusters and S1 nuclease detection  

作　　者：Zefeng Gu Anchen Fu Ru Qiu Ru Sun Zhijuan Cao 

机构地区：[1]Shanghai Key Laboratory of Bioactive Small Molecules&Department of Pharmaceutical Analysis,School of Pharmacy,Fudan University,Shanghai 201203,China

出　　处：《Chinese Chemical Letters》2022年第5期2711-2714,共4页中国化学快报（英文版）

基　　金：the projects of Innovative research team of high-level local universities in Shanghai and a key laboratory program of the Education Commission of Shanghai Municipality (No. ZDSYS14005);Program for high-level local universities in Shanghai (No. IDF301027/022);Shanghai Agriculture Science and Technology Support Project (No. 21N31900500);the National Natural Science Foundation of China (No. 21505023)

摘　　要：DNA-based logic gates promote the development of molecular computing and show enormous potential in the fields of nanotechnology and biotechnology. Dumbbell oligonucleotides(DNA) with poly-thymine(poly-T) loops and a nicked random double strand have been demonstrated to be an efficient template for the formation of fluorescent copper nanoclusters(Cu NCs) in our previous work. Herein, a new platform technology is presented with which to construct molecular logic gates by employing Cu NCs probe as a basic output generator, coupling of functional nucleases as the inputs. Two dumbbell DNAs are used with the difference in stem length(8 bp and 16 bp, respectively). The degradation of DNA templates can be tuned by various nucleic acid enzymes, single-stranded nuclease(S1), double-stranded specific nuclease(DSN), E. coli DNA ligase, exonucleases Ⅰ and Ⅲ. Briefly, S1 can digest both DNA templates, while the cleavage ability of DSN will be resistant by the short stem of SS-DNA(short-stem DNA). Exonuclease Ⅰ and Ⅲ can degrade these two nicked DNA templates, which are inhibited due to the ligation of E. coli DNA ligase. With this novel strategy, a set of logic gates is successfully constructed at the molecular level,including “YES”, “PASS 0”, “OR”, “INHIBIT”, which take the advantages of no label, easy operation, fast speed, high efficiency and low cost. Furthermore, S1 nuclease, as the biomarker of numerous carcinogens,is selectively detected in the range of 0.05–50 U/m L with the detection limit of 0.005 U/m L(1×10^(−6)U)based on this platform.

关 键 词：Logic gates Dumbbell DNA templates Poly-thymine loops Copper nanoclusters Nucleic acid enzymes 

分 类 号：Q503[生物学—生物化学] O657.3[理学—分析化学]