title: Noncovalent assembly of carbon nanotubes and single-stranded DNA: an effective sensing platform for probing biomolecular interactions.
abstract: In this paper, we report the assembly of single-walled carbon nanotubes (SWNTs) and single-stranded DNA to develop a new class of fluorescent biosensors which are able to probe and recognize biomolecular interactions in a homogeneous format. This novel sensing platform consists of a structure formed by the interaction of SWNTs and dye-labeled DNA oligonucleotides such that the proximity of the nanotube to the dye effectively quenches the fluorescence in the absence of a target. Conversely, and very importantly, the competitive binding of a target DNA or protein with SWNTs for the oligonucleotide results in the restoration of fluorescence signal in increments relative to the fluorescence without a target. This signaling mechanism makes it possible to detect the target by fluorescence spectroscopy. In the present study, the schemes for such fluorescence changes were examined by fluorescence anisotropy and fluorescence intensity measurements for DNA hybridization and aptamer-protein interaction studies.
authors.affiliation: Department of Chemistry, Shands Cancer Center and University of Florida Genetics Institute, University of Florida, Gainesville, Florida 32611-7200, USA.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Yang
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Tang
authors.forename: Jilin
authors.initials: J
authors.lastname: Yan
authors.forename: Huaizhi
authors.initials: H
authors.lastname: Kang
authors.forename: Youngmi
authors.initials: Y
authors.lastname: Kim
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhu
authors.forename: Weihong
authors.initials: W
authors.lastname: Tan
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry / Q000235:genetics; D001483:Base Sequence; D001667:Binding, Competitive; D015374:Biosensing Techniques / Q000379:methods*; D004277:DNA, Single-Stranded / Q000032:analysis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006801:Humans; D008958:Models, Molecular; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013917:Thrombin / Q000737:chemistry / Q000235:genetics
chemical_list: D052157:Aptamers, Nucleotide; D004277:DNA, Single-Stranded; D005456:Fluorescent Dyes; D037742:Nanotubes, Carbon; D013917:Thrombin