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https://www.readbyqxmd.com/read/28340381/studying-the-adsorption-of-dna-nanostructures-on-graphene-in-the-aqueous-phase-using-molecular-dynamic-simulations
#1
Jixue Sun, Yang Li, Jianping Lin
DNA nanostructures can undergo large structural fluctuations and deviate from their intended configurations. In this work, two model DNA nanostructures (i.e., Nan and Kai) were designed based on the shape of the two Chinese characters of the name of Nankai University, and additional single-stranded DNA fragments were added to interact with graphene. During four 50-ns molecular dynamic simulations in aqueous solution, the DNA nanostructures adsorbed onto graphene demonstrated more stable conformations with lower root mean square deviations and smaller coordinate changes in the z-axis direction than the DNA nanostructures that were not adsorbed onto graphene...
March 9, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28335324/dna-origami-reorganizes-upon-interaction-with-graphite-implications-for-high-resolution-dna-directed-protein-patterning
#2
Masudur Rahman, David Neff, Nathaniel Green, Michael L Norton
Although there is a long history of the study of the interaction of DNA with carbon surfaces, limited information exists regarding the interaction of complex DNA-based nanostructures with the important material graphite, which is closely related to graphene. In view of the capacity of DNA to direct the assembly of proteins and optical and electronic nanoparticles, the potential for combining DNA-based materials with graphite, which is an ultra-flat, conductive carbon substrate, requires evaluation. A series of imaging studies utilizing Atomic Force Microscopy has been applied in order to provide a unified picture of this important interaction of structured DNA and graphite...
October 31, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335274/metallic-nanostructures-based-on-dna-nanoshapes
#3
REVIEW
Boxuan Shen, Kosti Tapio, Veikko Linko, Mauri A Kostiainen, Jari Jussi Toppari
Metallic nanostructures have inspired extensive research over several decades, particularly within the field of nanoelectronics and increasingly in plasmonics. Due to the limitations of conventional lithography methods, the development of bottom-up fabricated metallic nanostructures has become more and more in demand. The remarkable development of DNA-based nanostructures has provided many successful methods and realizations for these needs, such as chemical DNA metallization via seeding or ionization, as well as DNA-guided lithography and casting of metallic nanoparticles by DNA molds...
August 10, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335267/dna-based-enzyme-reactors-and-systems
#4
REVIEW
Veikko Linko, Sami Nummelin, Laura Aarnos, Kosti Tapio, J Jussi Toppari, Mauri A Kostiainen
During recent years, the possibility to create custom biocompatible nanoshapes using DNA as a building material has rapidly emerged. Further, these rationally designed DNA structures could be exploited in positioning pivotal molecules, such as enzymes, with nanometer-level precision. This feature could be used in the fabrication of artificial biochemical machinery that is able to mimic the complex reactions found in living cells. Currently, DNA-enzyme hybrids can be used to control (multi-enzyme) cascade reactions and to regulate the enzyme functions and the reaction pathways...
July 27, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334880/dna-nanostructures-constructed-with-multi-stranded-motifs
#5
Donglei Yang, Zhenyu Tan, Yongli Mi, Bryan Wei
Earlier studies in DNA self-assembly have foretold the feasibility of building addressable nanostructures with multi-stranded motifs, which is fully validated in this study. In realizing this feasibility in DNA nanotechnology, a diversified set of motifs of modified domain lengths is extended from a classic type. The length of sticky ends can be adjusted to form different dihedral angles between the matching motifs, which corresponds to different connecting patterns. Moreover, the length of rigidity core can also be tuned to result in different dihedral angles between the component helices of a certain motif therefore different numbers of component helices...
February 22, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28331958/nucleic-acid-sensing-with-enzyme-dna-binding-protein-conjugates-cascade-and-simple-dna-nanostructures
#6
Gülsen Betül Aktas, Vasso Skouridou, Lluis Masip
A versatile and universal DNA sensing platform is presented based on enzyme-DNA binding protein tags conjugates and simple DNA nanostructures. Two enzyme conjugates were thus prepared, with horseradish peroxidase linked to the dimeric single-chain bacteriophage Cro repressor protein (HRP-scCro) and glucose oxidase linked to the dimeric headpiece domain of Escherichia coli LacI repressor protein (GOx-dHP), and used in conjunction with a hybrid ssDNA-dsDNA detection probe. This probe served as a simple DNA nanostructure allowing first for target recognition through its target-complementary single-stranded DNA (ssDNA) part and then for signal generation after conjugate binding on the double-stranded DNA (dsDNA) containing the specific binding sites for the dHP and scCro DNA binding proteins...
March 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28330413/molecular-dynamic-simulation-and-dft-study-on-the-drug-dna-interaction-crocetin-as-an-anticancer-and-dna-nanostructure-model
#7
Ebrahim Azarhazin, Mohammad Izadyar, Mohammad Reza Housaindokht
In this research, the interaction of Crocetin as an anticancer drug and a Dickerson DNA has been investigated. 25 ns molecular dynamic simulations of Crocetin and DNA composed of twelve base pairs and a sequence of d(CGCGAATTCGCG)2 were done in water. Three definite parts of the B-DNA were considered in analyzing the best interactive site from the thermodynamic point of view. Binding energy analysis showed that van der Waals interaction is the most important part related to the reciprocal O and H atoms of the Crocetin and DNA...
March 22, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28328200/fluorescence-resonance-energy-transfer-based-dna-tetrahedron-nano-tweezer-for-highly-reliable-detection-of-tumor-related-mrna-in-living-cells
#8
Lei He, Dan-Qing Lu, Hao Liang, Sitao Xie, Can Luo, Miaomiao Hu, Liujun Xu, Xiaobing Zhang, Weihong Tan
Accurate detection and imaging of tumor-related mRNA in living cells hold great promise for early cancer detection. However, currently, most probes designed to image intracellular mRNA confront intrinsic interferences arising from complex biological matrices and resulting in inevitable false-positive signals. To circumvent this problem, a new class of intracellular DNA nanoprobe, termed DNA tetrahedron nano-tweezer (DTNT), was developed to reliably image tumor-related mRNA in living cells based on the FRET (fluorescence resonance energy transfer) "off" to "on" signal readout mode...
March 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28327725/a-four-helix-bundle-dna-nanostructure-with-binding-pockets-for-pyrimidine-nucleotides
#9
Rainer Joachim Schwarz, Clemens Richert
Designed DNA nanostructures of impressive size have been described, but designed structures of the size of protein enzymes that bind organic ligands with high specificity are rare. Here we report a four-helix motif consisting of three synthetic strands with 65 base pairs and 165 nucleotides in total that folds well. Furthermore, we show that in the interior of this small folded DNA nanostructure, cavities can be set up that bind pyrimidine nucleotides with micromolar affinity. Base-specific binding for both thymidine and cytidine derivatives is demonstrated...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28317958/the-collective-behavior-of-spring-like-motifs-tethered-to-a-dna-origami-nanostructure
#10
E-C Schöneweiß, B Saccà
Dynamic DNA nanotechnology relies on the integration of small switchable motifs at suitable positions of DNA nanostructures, thus enabling the manipulation of matter with nanometer spatial accuracy in a trigger-dependent fashion. Typical examples of such motifs are hairpins, whose elongation into duplexes can be used to perform long-range, translational movements. In this work, we used temperature-dependent FRET spectroscopy to determine the thermal stabilities of distinct sets of hairpins integrated into the central seam of a DNA origami structure...
March 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28317903/stability-and-dynamics-of-membrane-spanning-dna-nanopores
#11
Vishal Maingi, Jonathan R Burns, Jaakko J Uusitalo, Stefan Howorka, Siewert J Marrink, Mark S P Sansom
Recently developed DNA-based analogues of membrane proteins have advanced synthetic biology. A fundamental question is how hydrophilic nanostructures reside in the hydrophobic environment of the membrane. Here, we use multiscale molecular dynamics (MD) simulations to explore the structure, stability and dynamics of an archetypical DNA nanotube inserted via a ring of membrane anchors into a phospholipid bilayer. Coarse-grained MD reveals that the lipids reorganize locally to interact closely with the membrane-spanning section of the DNA tube...
March 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28317184/self-assembled-multivalent-samul-polyanion-binding-impact-of-hydrophobic-modifications-in-the-micellar-core-on-dna-and-heparin-binding-at-the-peripheral-cationic-ligands
#12
Buthaina Albanyan, Erik Laurini, Paola Posocco, Sabrina Pricl, David K Smith
This paper reports a small family of cationic surfactants designed to bind polyanions such as DNA and heparin. Each molecule has the same hydrophilic cationic ligand, and a hydrophobic aliphatic group with eighteen carbon atoms with either one, two or three alkene groups within the hydrophobic chain (C18-1, C18-2 and C18-3). Dynamic light scattering indicates that more alkenes lead to geometric distortion, giving rise to larger self-assembled multivalent (SAMul) nanostructures. Mallard Blue and Ethidium Bromide dye displacement assays demonstrate that heparin and DNA have markedly different binding preferences, with heparin binding most effectively to C18-1, and DNA to C18-3, even though the molecular structural differences of these SAMul systems are buried in the hydrophobic core...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28300237/modular-synthesis-of-supramolecular-dna-amphiphiles-through-host-guest-interactions-and-their-self-assembly-into-dna-decorated-nanovesicles
#13
Shine K Albert, Hari Veera Prasad Thelu, Murali Golla, Nithiyanandan Krishnan, Reji Varghese
DNA nanostructures have found potential applications in various fields including nanotechnology, materials science and nanomedicine, hence the design and synthesis of DNA nanostructures is extremely important. Self-assembly of DNA amphiphiles provides an efficient strategy for the crafting of soft DNA nanostructures. However, the synthesis of DNA amphiphiles is always challenging. Herein, we show a non-covalent approach based on the host-guest interaction between β-CD and adamantane for the synthesis of DNA amphiphiles, and report their amphiphilicity-driven self-assembly into DNA decorated vesicles...
March 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28295864/block-copolymer-micellization-as-a-protection-strategy-for-dna-origami
#14
Nayan P Agarwal, Michael Matthies, Fatih N Gür, Kensuke Osada, Thorsten L Schmidt
DNA nanotechnology enables the synthesis of nanometer-sized objects that can be site-specifically functionalized with a large variety of materials. For these reasons, DNA-based devices such as DNA origami are being considered for applications in molecular biology and nanomedicine. However, many DNA structures need a higher ionic strength than that of common cell culture buffers or bodily fluids to maintain their integrity and can be degraded quickly by nucleases. To overcome these deficiencies, we coated several different DNA origami structures with a cationic poly(ethylene glycol)-polylysine block copolymer, which electrostatically covered the DNA nanostructures to form DNA origami polyplex micelles (DOPMs)...
March 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28294495/ultrathin-covalently-bound-organic-layers-on-mica-formation-of-atomically-flat-biofunctionalizable-surfaces
#15
Rickdeb Sen, Digvijay Gahtory, Rui Rijo Carvalho, Bauke Albada, Floris L van Delft, Han Zuilhof
Mica is the substrate of choice for microscopic visualization of a wide variety of intricate nanostructures. Unfortunately, the lack of a facile strategy for its modification has prevented the on-mica assembly of nanostructures. Herein, we disclose a convenient catechol-based linker that enables various surface-bound metal-free click reactions, and an easy modification of mica with DNA nanostructures and a horseradish peroxidase mimicking hemin/G-quadruplex DNAzyme.
March 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28287705/aptasensor-with-expanded-nucleotide-using-dna-nanotetrahedra-for-electrochemical-detection-of-cancerous-exosomes
#16
Sai Wang, Liqin Zhang, Shuo Wan, Sena Cansiz, Cheng Cui, Yuan Liu, Ren Cai, Chengyi Hong, I-Ting Teng, Muling Shi, Yuan Wu, Yiyang Dong, Weihong Tan
Exosomes are extracellular vesicles (50-100 nm) circulating in biofluids as intercellular signal transmitters. Although the potential of cancerous exosomes as tumor biomarkers is promising, sensitive and rapid detection of exosomes remains challenging. Herein, we combined the strengths of advanced aptamer technology, DNA-based nanostructure, and portable electrochemical devices to develop a nanotetrahedron (NTH)-assisted aptasensor for direct capture and detection of hepatocellular exosomes. The oriented immobilization of aptamers significantly improved the accessibility of an artificial nucleobase-containing aptamer to suspended exosomes, and the NTH-assisted aptasensor could detect exosomes with 100-fold higher sensitivity when compared to the single-stranded aptamer-functionalized aptasensor...
March 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28287704/orientational-binding-of-dna-guided-by-the-c2n-template
#17
Zonglin Gu, Lin Zhao, Weifeng Li, Shengtang Liu, Guangxin Duan, Jose Manuel Perez-Aguilar, Judong Luo, Ruhong Zhou
A detailed understanding of the interactions between biomolecules and nanomaterial surfaces is critical for the development of biomedical applications of these novel nanomaterials. Here, we characterized the binding patterns and dynamics of a double stranded DNA (dsDNA) segment on the recently synthesized nitrogenized graphene (C2N) with both theoretical (including classical and quantum calculations) and experimental approaches. Our results show that the dsDNA repeatedly exhibits a strong preference in its binding mode on the C2N substrate, displaying an upright orientation that is independent of its initial configurations...
March 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28287117/barcode-extension-for-analysis-and-reconstruction-of-structures
#18
Cameron Myhrvold, Michael Baym, Nikita Hanikel, Luvena L Ong, Jonathan S Gootenberg, Peng Yin
Collections of DNA sequences can be rationally designed to self-assemble into predictable three-dimensional structures. The geometric and functional diversity of DNA nanostructures created to date has been enhanced by improvements in DNA synthesis and computational design. However, existing methods for structure characterization typically image the final product or laboriously determine the presence of individual, labelled strands using gel electrophoresis. Here we introduce a new method of structure characterization that uses barcode extension and next-generation DNA sequencing to quantitatively measure the incorporation of every strand into a DNA nanostructure...
March 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28275219/intrinsic-dynamics-analysis-of-a-dna-octahedron-by-elastic-network-model
#19
Guang Hu, Lei He, Federico Iacovelli, Mattia Falconi
DNA is a fundamental component of living systems where it plays a crucial role at both functional and structural level. The programmable properties of DNA make it an interesting building block for the construction of nanostructures. However, molecular mechanisms for the arrangement of these well-defined DNA assemblies are not fully understood. In this paper, the intrinsic dynamics of a DNA octahedron has been investigated by using two types of Elastic Network Models (ENMs). The application of ENMs to DNA nanocages include the analysis of the intrinsic flexibilities of DNA double-helices and hinge sites through the calculation of the square fluctuations, as well as the intrinsic collective dynamics in terms of cross-collective map calculation coupled with global motions analysis...
January 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28264159/streamlined-synthesis-and-assembly-of-a-hybrid-sensing-architecture-with-solid-binding-proteins-and-click-chemistry
#20
Brian J F Swift, Jared A Shadish, Cole A DeForest, François Baneyx
Combining bioorthogonal chemistry with the use of proteins engineered with adhesive and morphogenetic solid-binding peptides is a promising route for synthesizing hybrid materials with the economy and efficiency of living systems. Using optical sensing of chloramphenicol as a proof of concept, we show here that a GFP variant engineered with zinc sulfide and silica-binding peptides on opposite sides of its β-barrel supports the fabrication of protein-capped ZnS:Mn nanocrystals that exhibit the combined emission signatures of organic and inorganic fluorophores...
March 13, 2017: Journal of the American Chemical Society
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