Saran, RunjhunLiu, Juewen2017-04-282017-04-282016-04-05http://dx.doi.org/10.1021/acs.analchem.6b00327http://hdl.handle.net/10012/11801This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry, © 2016 American Chemical Society after peer review and technical editing by publisher. To access the final edited and published work see Saran, R., & Liu, J. (2016). A Silver DNAzyme. Analytical Chemistry, 88(7), 4014–4020. http://dx.doi.org/10.1021/acs.analchem.6b00327Silver is a very common heavy metal, and its detection is of significant analytical importance. DNAzymes are DNA-based catalysts; they typically recruit divalent and trivalent metal ions for catalysis. Herein, we report a silver specific RNA-cleaving DNAzyme named Ag10c obtained after six rounds of in vitro selection. Ag10c displays a catalytic rate of 0.41 min(-1) with 10 mu M Ag+ at pH 7.5 with 200 mM NaNO3, while its activity is completely inhibited with the same concentration of NaCl. Ag10c is highly specific for Ag+ among all the tested metals. A catalytic beacon biosensor is designed by labeling a fluorophore and a quencher on the DNAzyme. Fluorescence enhancement is observed in the presence of Ag+ with a detection limit of 24.9 nM Ag+. The sensor shows a similar analytical performance in Lake Huron water. This is the first monovalent transition metal dependent RNA-cleaving DNAzyme. Apart from its biosensor application, this study strengthens the idea of exploring beyond the traditional understanding of multivalent ion dependent DNAzyme catalysis.enLanthanide-Dependent DNAzymeIn-Vitro SelectionCleaving DNAMetal-IonsAcidCatalysisSensorNanoparticlesSensitivityBiosensorArticle