© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor-in-Chief: José Oliveira; Deputy Editors: Yan Li, Guangchen Xu
Online ISSN: 1613-6829
Associated Title(s): Advanced Electronic Materials, Advanced Energy Materials, Advanced Engineering Materials, Advanced Functional Materials, Advanced Healthcare Materials, Advanced Materials, Advanced Materials Interfaces, Advanced Optical Materials, Advanced Science, Particle & Particle Systems Characterization
Nanopore Biosensors: Monitoring of an ATP-Binding Aptamer and its Conformational Changes Using an α-Hemolysin Nanopore (Small 1/2011)
An aptamer is a specific oligonucleotide sequence that spontaneously forms a secondary structure capable of selectively binding an analyte. An aptamer’s conformation is the key to specific binding of a target molecule, even in the case of very closely related targets. Nanopores are a sensitive tool for the single-molecule analysis of DNA, peptides, and proteins transporting through the pore. Herein, a single α-hemolysin natural nanopore is utilized to sense the conformational changes of an adenosine 5’-triphosphate (ATP)-binding aptamer (ABA). The known DNA sequence of the ABA is used as a model to develop real-time monitoring of molecular conformational changes that occur by binding targets. The native, folded ABA structure has a nanopore unfolding time of 4.17 ms, compared with 0.29 ms for the ABA:ATP complex. A complementary 14-mer strand, which binds the ABA sequence in the key nucleic acids responsible for folding, forms linear duplex DNA, resulting in a nanopore transit time of 0.50 ms and a higher capture probability than that of the folded ABA oligomer. Competition assays between the ABA:ATP and ABA:reporter complexes are carried out, and the results suggest that the ABA:ATP complex is formed preferentially. The nanopore allows for the detection of an ABA in its folded, ATP-bound, and linear conformations.