title: Aptamer-based ATP assay using a luminescent light switching complex.
abstract: With the increasing applications of nucleic acid aptamers as a new class of molecular recognition probes in bioanalysis and biosensor development, the development of general and simple signaling strategies to transduce aptamer-target binding events to detectable signals is demanding. We have developed a new signaling method based on aptamers and a DNA molecular light switching complex, [Ru(phen)2(dppz)]2+, for sensitive protein detection. In this work, we have demonstrated the applicability of this signaling mechanism to small-molecule detection using ATP as a model target. Our results have shown that upon ATP binding to the folded aptamer where [Ru(phen)2(dppz)]2+ intercalated, the conformational change or distortion of the aptamer is large enough to cause a significant luminescence change of [Ru(phen)2(dppz)]2+. By monitoring the ATP-dependent luminescence intensity change, we have achieved ATP detection with high selectivity and high sensitivity down to 1 nM in homogeneous solution. The method is very simple without the needs for covalently labeling aptamers or using costly enzymes and multistep analysis as other reported fluorescence/luminescence assays for ATP. The successful detection of ATP indicates that using the signaling aptamers with [Ru(phen)2(dppz)]2+ is expected to be a general method for aptamer-based target detection.
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Yaxin
authors.initials: Y
authors.lastname: Jiang
authors.forename: Cuisong
authors.initials: C
authors.lastname: Zhou
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Fang
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis*; D052157:Aptamers, Nucleotide / Q000737:chemistry*; D008027:Light; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D009994:Osmolar Concentration; D012680:Sensitivity and Specificity; D012996:Solutions / Q000737:chemistry; D013329:Structure-Activity Relationship
chemical_list: D052157:Aptamers, Nucleotide; D049408:Luminescent Agents; D009942:Organometallic Compounds; C466600:Ru(phen)(2)dipyrido(3,2-a-2',3'-c)phenazine; D012996:Solutions; D000255:Adenosine Triphosphate