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New DNA Research Study Findings Reported from CREST Research Project (Single-Molecule Imaging of Dynamic Motions of Biomolecules in DNA Origami...

July 22, 2014



New DNA Research Study Findings Reported from CREST Research Project (Single-Molecule Imaging of Dynamic Motions of Biomolecules in DNA Origami Nanostructures Using High-Speed Atomic Force Microscopy)

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on DNA Research. According to news reporting originating from Tokyo, Japan, by NewsRx correspondents, research stated, "CONSPECTUS: Direct imaging of molecular motions is one of the most fundamental issues for elucidating the physical properties of individual molecules and their reaction mechanisms. Atomic force microscopy (AFM) enables direct molecular imaging, especially for biomolecules in the physiological environment."

Our news editors obtained a quote from the research from CREST Research Project, "Because AFM can visualize the molecules at nanometer-scale spatial resolution, a versatile observation scaffold is needed for the precise imaging of molecule interactions in the reactions. The emergence of DNA origami technology allows the precise placement of desired molecules in the designed nanostructures and enables molecules to be detected at the single-molecule level. In our study, the DNA origami system was applied to visualize the detailed motions of target molecules in reactions using high-speed AFM (HS-AFM), which enables the analysis of dynamic motions of biomolecules in a subsecond time resolution. In this system, biochemical properties such as the placement of various double-stranded DNAs (dsDNAs) containing unrestricted DNA sequences, modified nucleosides, and chemical functions can be incorporated. From a physical point of view, the tension and rotation of dsDNAs can be controlled by placement into the DNA nanostructures. From a topological point of view, the orientations of dsDNAs and various shapes of dsDNAs including Holliday junctions can be incorporated for studies on reaction mechanisms. In this Account, we describe the combination of the DNA origami system and HS-AFM for imaging various biochemical reactions including enzymatic reactions and DNA structural changes. To observe the behaviors and reactions of DNA methyltransferase and DNA repair enzymes, the substrate dsDNAs were incorporated into the cavity of the DNA frame, and the enzymes that bound to the target dsDNA were observed using HS-AFM. DNA recombination was also observed using the recombination substrates and Holliday junction intermediates placed in the DNA frame, and the direction of the reactions was controlled by introducing structural stress to the substrates. In addition, the movement of RNA polymerase and its reaction were visualized using a template dsDNA attached to the origami structure. To observe DNA structural changes, G-quadruplex formation and disruption, the switching behaviors of photoresponsive oligonucleotides, and B-Z transition were visualized using the DNA frame observation system. For the formation and disruption of G-quadruplex and double-helix DNA, the-two dsDNA(-) chains incorporated into the DNA frame could amplify the small structural change to the global structural change, which enabled the visualization of their association and dissociation by HS-AFM. The dynamic motion of the helical rotation induced by the B-Z transition was also directly imaged in the DNA frame. Furthermore, the stepwise motions of mobile DNA along the DNA track were visualized on the DNA origami surface."

According to the news editors, the research concluded: "These target-orientated observation systems should contribute to the detailed analysis of biomolecule motions in real time and at molecular resolution."

For more information on this research see: Single-Molecule Imaging of Dynamic Motions of Biomolecules in DNA Origami Nanostructures Using High-Speed Atomic Force Microscopy. Accounts of Chemical Research, 2014;47(6):1645-1653. Accounts of Chemical Research can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Accounts of Chemical Research - www.pubs.acs.org/journal/achre4)

The news editors report that additional information may be obtained by contacting M. Endo, Japan Sci & Technology Corp JST, CREST, Chiyoda Ku, Tokyo 1020075, Japan (see also DNA Research).

Keywords for this news article include: Asia, Tokyo, Japan, Biochemical, Biochemistry, DNA Research, Nanostructural, Nanostructures, Nanotechnology, Emerging Technologies, Atomic Force Microscopy

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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