title: Detection system based on the conformational change in an aptamer and its application to simple bound/free separation.
abstract: Aptamers are good molecular recognition elements for biosensors. Especially, their conformational change, which is induced by the binding to the target molecule, enables the development of several types of useful detection systems. We applied this property to bound/free separation, which is a crucial process for highly sensitive detection. We designed aptamers which change their conformation upon binding to the target molecule and thereby expose a single-strand bearing the complementary sequence to the capture probe immobilized onto the support. We named the designed aptamers "capturable aptamers" and the capture probe "capture DNA". Three capturable aptamers were designed based on the PrP aptamer, which binds to prion protein. One of these capturable aptamers was demonstrated to recognize prion protein and change its conformation upon binding to it. A detection system using this designed capturable aptamer for prion protein was developed. Capturable aptamers and capture DNA allow us to perform simple bound/free separation with only one target ligand.
authors.affiliation: Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Ogasawara
authors.forename: Naomi S
authors.initials: NS
authors.lastname: Hachiya
authors.forename: Kiyotoshi
authors.initials: K
authors.lastname: Kaneko
authors.forename: Koji
authors.initials: K
authors.lastname: Sode
authors.forename: Kazunori
authors.initials: K
authors.lastname: Ikebukuro
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D001665:Binding Sites; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011328:Prions / Q000737:chemistry* / Q000648:ultrastructure*; D011485:Protein Binding; D011487:Protein Conformation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance
chemical_list: D052157:Aptamers, Nucleotide; D011328:Prions