Download PDF by Yangyang Yang: Artificially Controllable Nanodevices Constructed by DNA

By Yangyang Yang

ISBN-10: 4431557687

ISBN-13: 9784431557685

ISBN-10: 4431557695

ISBN-13: 9784431557692

In this e-book, the writer offers in most cases with themes: (1) single-molecule visualization of switching behaviors within the DNA nanoframe approach using other forms of molecular switches by using high-speed atomic strength microscope (AFM); (2) development of photocontrollable DNA nanostructures in programmed styles and direct visualization of the dynamic assembling method. right here, high-speed AFM used to be hired to monitor the dynamic routine of unmarried molecules. in comparison to a conventional single-molecule research procedure, equivalent to fluorescence spectroscopy or electron microscopy, high-speed AFM makes attainable the real-time remark of molecule behaviors. DNA nanostructures have been designed and assembled as scaffolds to include biomolecules. The observations have been conducted below strong stipulations with no advanced pretreatment. additionally, the photoresponsive molecules have been effectively assembled into round a hundred nm-sized DNA nanostructures. The assembly/disassembly of nanostructures could be regulated reversibly via photoirradiation. This e-book explains how DNA origami has progressively develop into a great tool for the research of biochemical interactions in outlined nanospace. It additionally indicates the potential of DNA nanostructures performing as nanodevices for program in organic structures, serving as a superb advent to simple DNA nanotechnology.

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Extra info for Artificially Controllable Nanodevices Constructed by DNA Origami Technology: Photofunctionalization and Single-Molecule Analysis

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However, it was noted that there were still 7 % of nanostructures exist in AS-2 state and 31 % of nanostructures exist in RS state. By adding K+ (50 mM, switch-2) alone into the initial solution, the percentage of nanostructures at AS-1 state was slightly decreased while the percentage of both RS and AS-2 were slightly increased (Fig. 4d). This result suggests that the addition of K+ alone had slight effect on all three states formation. On the other hand, 40 3 Direct Observation of Logic-Gated Dual-Switching Behaviors … Fig.

5 Direct Observation of Association of Photoresponsive Domains in Nanoframe Under Visible Light Irradiation Under UV irradiation, the dissociation behaviors of single pair of photoresponsive domain on DNA nanoframe were directly visualized in real-time. Next it is tried to observe the reverse hybridization movements with the irradiation of visible light. The sample pretreated with UV light was loaded on the mica surface and the expected nanoframes in separated-shape were imaged. Visible light (λ = 440– 470 nm) was then introduced by band path filter for the cis- to trans-isomerization of azobenzene molecules in the nanostructures.

The relative facing orientation should be distinguished by comparing relative positions of the loops at the inner side of e-domain (marked on AFM images by blue and green triangles in Fig. 3). In addition, hairpin markers were introduced to the e-domain for the preparation of B-series monomer to differentiate assembling units of A-series and B-series. In the AFM images of dimers, four Azo-ODN duplexes as linkers between two monomers were also clearly imaged in high resolution (pointed by orange arrows in AFM image), representing that these hexagonal-shaped nanostructures were in dimer form not just randomly absorbed closely on mica surface in coincidence.

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Artificially Controllable Nanodevices Constructed by DNA Origami Technology: Photofunctionalization and Single-Molecule Analysis by Yangyang Yang

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