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https://www.readbyqxmd.com/read/29769616/magnetic-field-induced-rotation-of-magnetosome-chains-in-silicified-magnetotactic-bacteria
#1
Marine Blondeau, Yohan Guyodo, François Guyot, Christophe Gatel, Nicolas Menguy, Imène Chebbi, Bernard Haye, Mickaël Durand-Dubief, Edouard Alphandery, Roberta Brayner, Thibaud Coradin
Understanding the biological processes enabling magnetotactic bacteria to maintain oriented chains of magnetic iron-bearing nanoparticles called magnetosomes is a major challenge. The study aimed to constrain the role of an external applied magnetic field on the alignment of magnetosome chains in Magnetospirillum magneticum AMB-1 magnetotactic bacteria immobilized within a hydrated silica matrix. A deviation of the chain orientation was evidenced, without significant impact on cell viability, which was preserved after the field was turned-off...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29732064/structure-and-formation-of-highly-luminescent-protein-stabilized-gold-clusters
#2
D M Chevrier, V D Thanthirige, Z Luo, S Driscoll, P Cho, M A MacDonald, Q Yao, R Guda, J Xie, E R Johnson, A Chatt, N Zheng, P Zhang
Highly luminescent gold clusters simultaneously synthesized and stabilized by protein molecules represent a remarkable category of nanoscale materials with promising applications in bionanotechnology as sensors. Nevertheless, the atomic structure and luminescence mechanism of these gold clusters are still unknown after several years of developments. Herein, we report findings on the structure, luminescence and biomolecular self-assembly of gold clusters stabilized by the large globular protein, bovine serum albumin...
March 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29714396/tailoring-lumazine-synthase-assemblies-for-bionanotechnology
#3
REVIEW
Yusuke Azuma, Thomas G W Edwardson, Donald Hilvert
Nanoscale compartments formed by hierarchical protein self-assembly are valuable platforms for nanotechnology development. The well-defined structure and broad chemical functionality of protein cages, as well as their amenability to genetic and chemical modification, have enabled their repurposing for diverse applications. In this review, we summarize progress in the engineering of the cage-forming enzyme lumazine synthase. This bacterial nanocompartment has proven to be a malleable scaffold. The natural protein has been diversified to afford a family of unique proteinaceous capsules that have been modified, evolved and assembled with other components to produce nanoreactors, artificial organelles, delivery vehicles and virus mimics...
May 1, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29697964/programmable-in-vitro-co-encapsidation-of-guest-proteins-for-intracellular-delivery-by-virus-like-particles
#4
Noor H Dashti, Rufika S Abidin, Frank Sainsbury
Bioinspired self-sorting and self-assembling systems using engineered versions of natural protein cages are being developed for biocatalysis and therapeutic delivery. The packaging and intracellular delivery of guest proteins is of particular interest for both in vitro and in vivo cell engineering. However, there is a lack of bionanotechnology platforms that combine programmable guest protein encapsidation with efficient intracellular uptake. We report a minimal peptide anchor for in vivo self-sorting of cargo-linked capsomeres of Murine polyomavirus (MPyV) that enables controlled encapsidation of guest proteins by in vitro self-assembly...
April 26, 2018: ACS Nano
https://www.readbyqxmd.com/read/29688238/molecular-simulations-of-self-assembling-bio-inspired-supramolecular-systems-and-their-connection-to-experiments
#5
REVIEW
Pim W J M Frederix, Ilias Patmanidis, Siewert J Marrink
In bionanotechnology, the field of creating functional materials consisting of bio-inspired molecules, the function and shape of a nanostructure only appear through the assembly of many small molecules together. The large number of building blocks required to define a nanostructure combined with the many degrees of freedom in packing small molecules has long precluded molecular simulations, but recent advances in computational hardware as well as software have made classical simulations available to this strongly expanding field...
April 24, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29658020/human-plasma-proteome-association-and-cytotoxicity-of-nano-graphene-oxide-grafted-with-stealth-polyethylene-glycol-and-poly-2-ethyl-2-oxazoline
#6
Miaoyi Wang, Ove J R Gustafsson, Ghizal Siddiqui, Ibrahim Javed, Hannah G Kelly, Thomas Blin, Hong Yin, Stephen J Kent, Darren J Creek, Kristian Kempe, Pu Chun Ke, Thomas P Davis
Polyethylene glycol (PEG) is a gold standard against protein fouling. However, recent studies have revealed surprising adverse effects of PEG, namely its immunogenicity and shortened bio-circulation upon repeated dosing. This highlights a crucial need to further examine 'stealth' polymers for controlling the protein 'corona', a new challenge in nanomedicine and bionanotechnology. Poly(2-ethyl-2-oxazoline) (PEtOx) is another primary form of stealth polymer that, despite its excellent hydrophilicity and biocompatibility, has found considerably less applications compared with PEG...
April 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29621630/conformational-properties-of-intrinsically-disordered-proteins-bound-to-the-surface-of-silica-nanoparticles
#7
Michele Vitali, Valentina Rigamonti, Antonino Natalello, Barbara Colzani, Svetlana Avvakumova, Stefania Brocca, Carlo Santambrogio, Joanna Narkiewicz, Giuseppe Legname, Miriam Colombo, Davide Prosperi, Rita Grandori
BACKGROUND: Protein-nanoparticle (NP) interactions dictate properties of nanoconjugates relevant for bionanotechnology. Non-covalent adsorption generates a protein corona (PC) formed by an inner and an outer layer, the hard and soft corona (HC, SC). Intrinsically disordered proteins (IDPs) exist in solution as conformational ensembles, whose features in the presence of NPs are not well known. METHODS: Three IDPs (α-casein, Sic1 and α-synuclein) and lysozyme are compared, describing conformational properties inside HC on silica NPs by circular dichroism (CD) and Fourier-transform infrared (FTIR) spectroscopy...
April 2, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29599566/show-yourself-asparaginase-an-enzymatic-reaction-explained-through-a-hands-on-interactive-activity
#8
Josell Ramirez-Paz, Bonny M Ortiz-Andrade, Kai Griebenow, Liz Díaz-Vázquez
Determining the catalytic activity of an enzyme can be the perfect method for its identification, for example during purification procedures or for isolation purposes. Herein, we used a pharmaceutically relevant protein to bring the concept of enzymatic activity to the classroom. We designed a hands-on interactive activity in which a medically relevant enzyme, asparaginase, was distinguished from a nonenzymatic protein based on its specific enzymatic activity. The experiment was carried out in the classroom, designed to impact different educational levels from elementary to high school...
June 13, 2017: Journal of Chemical Education
https://www.readbyqxmd.com/read/29597075/bionanotechnology-for-vaccine-design
#9
REVIEW
Steven Frey, Ana Castro, Ammar Arsiwala, Ravi S Kane
There have been significant advances in the design of nanostructured scaffolds for eliciting robust immune responses. One method to produce strong immune responses is to emulate the appearance of a pathogen. Since pathogens such as viruses and bacteria often display multiple copies of ligands on their surfaces, the immune system is particularly sensitive towards multivalent displays of antigens. Consequently, when designing a vaccine, it is advantageous to decorate a nanostructured surface with multiple copies of an antigen...
March 26, 2018: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/29532022/metabolic-fingerprinting-on-a-plasmonic-gold-chip-for-mass-spectrometry-based-in-vitro-diagnostics
#10
Xuming Sun, Lin Huang, Ru Zhang, Wei Xu, Jingyi Huang, Deepanjali D Gurav, Vadanasundari Vedarethinam, Ruoping Chen, Jiatao Lou, Qian Wang, Jingjing Wan, Kun Qian
Current metabolic analysis is far from ideal to engage clinics and needs rationally designed materials and device. Here we developed a novel plasmonic chip for clinical metabolic fingerprinting. We first constructed a series of chips with gold nanoshells on the surface through controlled particle synthesis, dip-coating, and gold sputtering for mass production. We integrated the optimized chip with microarrays for laboratory automation and micro-/nanoscaled experiments, which afforded direct high-performance metabolic fingerprinting by laser desorption/ionization mass spectrometry using 500 nL of various biofluids and exosomes...
February 28, 2018: ACS Central Science
https://www.readbyqxmd.com/read/29509403/recent-advances-of-membrane-cloaked-nanoplatforms-for-biomedical-applications
#11
Xiangzhao Ai, Ming Hu, Zhimin Wang, Wenmin Zhang, Juan Li, Huanghao Yang, Jun Lin, Bengang Xing
In terms of the extremely small size and large specific surface area, nanomaterials often exhibit unusual physical and chemical properties, which have recently attracted considerable attention in bionanotechnology and nanomedicine. Currently, the extensive usage of nanotechnology in medicine holds great potential for precise diagnosis and effective therapeutics of various human diseases in clinical practice. However, a detailed understanding regarding how nanomedicine interacts with the intricate environment in complex living systems remains a pressing and challenging goal...
April 18, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29504678/carbon-nanozymes-enzymatic-properties-catalytic-mechanism-and-applications
#12
REVIEW
Hanjun Sun, Ya Zhou, Jinsong Ren, Xiaogang Qu
Nanozymes have advantages over natural enzymes, such as facile production on large scale, long storage time, low costs, and high stability in harsh environments. Carbon nanomaterials (CNMs), including fullerenes, carbon nanotubes, graphene, carbon quantum dots, and graphene quantum dots, have become a star family in materials science. As a new class of nanozymes, the catalytic activity of CNMs and their hybrids has been extensively reported. In this Minireview, recent progress of CNMs based artificial enzymes, focusing on those with peroxidase-like activity, has been summarized...
March 5, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29497609/heat-a-highly-efficient-skin-enhancer-for-transdermal-drug-delivery
#13
REVIEW
Sabine Szunerits, Rabah Boukherroub
Advances in materials science and bionanotechnology have allowed the refinements of current drug delivery systems, expected to facilitate the development of personalized medicine. While dermatological topical pharmaceutical formulations such as foams, creams, lotions, gels, etc., have been proposed for decades, these systems target mainly skin-based diseases. To treat systemic medical conditions as well as localized problems such as joint or muscle concerns, transdermal delivery systems (TDDSs), which use the skin as the main route of drug delivery, are very appealing...
2018: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/29481797/design-of-tryptophan-containing-mutants-of-the-symmetrical-pizza-protein-for-biophysical-studies
#14
Hiroki Noguchi, Bram Mylemans, Elke De Zitter, Luc Van Meervelt, Jeremy R H Tame, Arnout Voet
β-propeller proteins are highly symmetrical, being composed of a repeated motif with four anti-parallel β-sheets arranged around a central axis. Recently we designed the first completely symmetrical β-propeller protein, Pizza6, consisting of six identical tandem repeats. Pizza6 is expected to prove a useful building block for bionanotechnology, and also a tool to investigate the folding and evolution of β-propeller proteins. Folding studies are made difficult by the high stability and the lack of buried Trp residues to act as monitor fluorophores, so we have designed and characterized several Trp-containing Pizza6 derivatives...
March 18, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29451979/neat-protein-polymer-surfactant-bioconjugates-as-universal-solvents
#15
Anasua Mukhopadhyay, Tarasankar Das, Anindya Datta, Kamendra P Sharma
Solvents, particularly those having low volatility, are of great interest for the biocatalytic synthesis of utility chemicals and fuels. We show novel and universal solvent-like properties of a neat and water-less polymer surfactant-bovine serum albumin (BSA) conjugated material (WL-PS pBSA). This highly viscous, nonvolatile material behaves as a liquid above its solid-liquid transition temperature (∼25-27 °C) and can be used as a solvent for variety of completely dry solutes of different sizes and surface chemistries...
March 12, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29365316/manipulating-hemoglobin-oxygenation-using-silica-nanoparticles-a-novel-prospect-for-artificial-oxygen-carriers
#16
Stéphanie Devineau, Laurent Kiger, Frédéric Galacteros, Véronique Baudin-Creuza, Michael Marden, Jean Philippe Renault, Serge Pin
Recently, nanoparticles have attracted much attention as new scaffolds for hemoglobin-based oxygen carriers (HBOCs). Indeed, the development of bionanotechnology paves the way for the rational design of blood substitutes, providing that the interaction between the nanoparticles and hemoglobin at a molecular scale and its effect on the oxygenation properties of hemoglobin are finely controlled. Here, we show that human hemoglobin has a high affinity for silica nanoparticles, leading to the adsorption of hemoglobin tetramers on the surface...
January 23, 2018: Blood Advances
https://www.readbyqxmd.com/read/29228777/fast-and-strong-adsorption-of-native-oligonucleotides-on-citrate-coated-gold-nanoparticles
#17
Anna Epanchintseva, Pavel Vorobjev, Dmitrii Pyshnyi, Inna Pyshnaya
The adsorption of oligonucleotides on citrate-coated gold nanoparticles (AuNPs) is studied under conditions "right after the synthesis", i.e., in a weak citrate solution at a pH value close to neutral (5.8 ± 0.2). We found that short-term elevation of reaction temperature under these conditions provides fast and strong adsorption of oligonucleotides on the surface of AuNPs. The affinity of oligonucleotides to AuNPs depends on the length of the oligonucleotide and its nucleotide composition. The shortest oligonucleotide in this study, T6 , is the most affine, having the equilibrium binding constant KD = 0...
January 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29210408/a-protected-excitation-energy-reservoir-for-efficient-upconversion-luminescence
#18
Kai Huang, Haichun Liu, Marco Kraft, Swati Shikha, Xiang Zheng, Hans Ågren, Christian Würth, Ute Resch-Genger, Yong Zhang
Lanthanide-doped upconversion nanoparticles (UCNPs) are of great interest for biomedical applications. Currently, the applicability of UCNP bionanotechnology is hampered by the generally low luminescence intensity of UCNPs and inefficient energy transfer from UCNPs to surface-bound chromophores used e.g. for photodynamic therapy or analyte sensing. In this work, we address the low-efficiency issue by developing versatile core-shell nanostructures, where high-concentration sensitizers and activators are confined in the core and shell region of representative hexagonal NaYF4 :Yb,Er UCNPs...
December 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/29205597/selection-and-screening-of-dna-aptamers-for-inorganic-nanomaterials
#19
Yibo Zhou, Zhicheng Huang, Ronghua Yang, Juewen Liu
Searching for DNA sequences that can strongly and selectively bind to inorganic surfaces is a long-standing topic in bionanotechnology, analytical chemistry and biointerface research. This can be achieved either by aptamer selection starting with a very large library of ≈1014 random DNA sequences, or by careful screening of a much smaller library (usually from a few to a few hundred) with rationally designed sequences. Unlike typical molecular targets, inorganic surfaces often have quite strong DNA adsorption affinities due to polyvalent binding and even chemical interactions...
February 21, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29182276/identifying-structure-in-short-dna-scaffolds-using-solid-state-nanopores
#20
Eric Beamish, Vincent Tabard-Cossa, Michel Godin
The identification of molecular tags along nucleic acid sequences has many potential applications in bionanotechnology, disease biomarker detection, and DNA sequencing. An attractive approach to this end is the use of solid-state nanopores, which can electrically detect molecular substructure and can be integrated into portable lab-on-a-chip sensors. We present here a DNA origami-based approach of molecular assembly in which solid-state nanopores are capable of differentiating 165 bp scaffolds containing zero, one, and two dsDNA protrusions...
December 22, 2017: ACS Sensors
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