title: Interlocked DNA nanostructures controlled by a reversible logic circuit.
abstract: DNA nanostructures constitute attractive devices for logic computing and nanomechanics. An emerging interest is to integrate these two fields and devise intelligent DNA nanorobots. Here we report a reversible logic circuit built on the programmable assembly of a double-stranded (ds) DNA [3]pseudocatenane that serves as a rigid scaffold to position two separate branched-out head-motifs, a bimolecular i-motif and a G-quadruplex. The G-quadruplex only forms when preceded by the assembly of the i-motif. The formation of the latter, in turn, requires acidic pH and unhindered mobility of the head-motif containing dsDNA nanorings with respect to the central ring to which they are interlocked, triggered by release oligodeoxynucleotides. We employ these features to convert the structural changes into Boolean operations with fluorescence labelling. The nanostructure behaves as a reversible logic circuit consisting of tandem YES and AND gates. Such reversible logic circuits integrated into functional nanodevices may guide future intelligent DNA nanorobots to manipulate cascade reactions in biological systems.
authors.affiliation: Chemical Biology and Medicinal Chemistry Unit, Life and Medical Science (LIMES) Institute, University of Bonn, 53121 Bonn, Germany.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: Chemical Biology and Medicinal Chemistry Unit, Life and Medical Science (LIMES) Institute, University of Bonn, 53121 Bonn, Germany.
authors.forename: Finn
authors.initials: F
authors.lastname: Lohmann
authors.affiliation: 1] Chemical Biology and Medicinal Chemistry Unit, Life and Medical Science (LIMES) Institute, University of Bonn, 53121 Bonn, Germany [2] Center of Advanced European Studies and Research (CAESAR), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Famulok
mesh_terms: D000873:Anthracenes / Q000737:chemistry; D003124:Colorimetry; D004247:DNA / Q000737:chemistry*; D021881:DNA, Catalytic / Q000737:chemistry*; D054856:G-Quadruplexes; D006863:Hydrogen-Ion Concentration; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D012371:Robotics; D013050:Spectrometry, Fluorescence
chemical_list: D000873:Anthracenes; D021881:DNA, Catalytic; D009838:Oligodeoxyribonucleotides; C467767:catenane; D004247:DNA