title: Investigation of newly identified G-quadruplexes and their application to DNA detection.
abstract: G-quadruplexes are guanine-rich nucleic acid sequences that can act as universal signal-transducers and generate colorimetric, fluorescence, and chemiluminescence signals when complexed with different ligands. Due to their merits including easy modification and low cost, it is of great importance to explore new G-quadruplexes with improved performance. Herein the properties of newly identified G-quadruplexes 9th-3-35 and 10th-2-40 were investigated in detail with UV-vis spectra, circular dichroism (CD) spectra and fluorescence spectra. The results indicated that 9th-3-35 and 10th-2-40 exhibited excellent peroxidase-like activity, as well as fluorescence enhancement of thioflavin T (ThT). Furthermore, the application of G-quadruplexes to DNA detection was performed on account of the ThT fluorescence enhancement, and the limit of detection was as low as 8 pM. This study implied that 9th-3-35 and 10th-2-40 are competitive candidates as signal-transducers in the design of bioassays.
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Key Laboratory for Bio-Nanotechnology and Molecule Engineering of Hunan Province, Hunan University, Changsha, 410082, China. yangxiaohai@hnu.edu.cn kmwang@hnu.edu.cn.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Liu
authors.forename: Min
authors.initials: M
authors.lastname: Lin
authors.forename: Xiaohai
authors.initials: X
authors.lastname: Yang
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Nandi
authors.initials: N
authors.lastname: Chen
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Kemin
authors.initials: K
authors.lastname: Wang
authors.forename: Shiya
authors.initials: S
authors.lastname: Qin
mesh_terms: D002942:Circular Dichroism; D004247:DNA / Q000032:analysis*; D054856:G-Quadruplexes; D013050:Spectrometry, Fluorescence
chemical_list: D004247:DNA