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https://www.readbyqxmd.com/read/28516998/controllable-design-of-tunable-nanostructures-inside-metal-organic-frameworks
#1
Liyu Chen, Rafael Luque, Yingwei Li
The controllable encapsulation of nanoentities (such as metal nanoparticles, quantum dots, polyoxometalates, organic and metallorganic molecules, biomacromolecules, and metal-organic polyhedra) into metal-organic frameworks (MOFs) to form composite materials has attracted significant research interest in a variety of fields. These composite materials not only exhibit the properties of both the nanoentities and the MOFs but also display unique and synergistic functionalities. Tuning the sizes, compositions, and shapes of nanoentities encapsulated in MOFs enables the final composites to exhibit superior performance to those of the separate constituents for various applications...
May 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28516950/high-conductance-values-in-%C3%AF-folded-molecular-junctions
#2
Marco Carini, Marta P Ruiz, Imanol Usabiaga, José A Fernández, Emilio J Cocinero, Manuel Melle-Franco, Ismael Diez-Perez, Aurelio Mateo-Alonso
Folding processes play a crucial role in the development of function in biomacromolecules. Recreating this feature on synthetic systems would not only allow understanding and reproducing biological functions but also developing new functions. This has inspired the development of conformationally ordered synthetic oligomers known as foldamers. Herein, a new family of foldamers, consisting of an increasing number of anthracene units that adopt a folded sigmoidal conformation by a combination of intramolecular hydrogen bonds and aromatic interactions, is reported...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28511059/development-and-validation-of-a-rapid-reversed-phase-hplc-method-for-the-quantification-of-monoclonal-antibody-bevacizumab-from-polyester-based-nanoparticles
#3
Flávia Sousa, Virgínia M F Gonçalves, Bruno Sarmento
Bevacizumab is a powerful human monoclonal antibody approved worldwide for treatment of several types of cancer and ocular diseases due to its potential as antiangiogenic drug. Nowadays, in order to improve the monoclonal antibody-based therapy, attempts have been focused in the formulation of these biomacromolecules into nanoparticles. Thus, the aim of this work was to develop and validate a reversed-phase high-performance liquid chromatography with fluorescence detection method for the determination of bevacizumab from nanoparticulate systems, according to the International Conference on Harmonization guidelines...
May 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28509549/heterogeneous-backbone-foldamer-mimics-of-zinc-finger-tertiary-structure
#4
Kelly L George, W Seth Horne
A variety of oligomeric backbones with compositions deviating from biomacromolecules can fold in defined ways. Termed "foldamers," these agents have diverse potential applications. A number of protein-inspired secondary structures (e.g., helices, sheets) have been produced from unnatural backbones, yet examples of tertiary folds combining several secondary structural elements in a single entity are rare. One promising strategy to address this challenge is the systematic backbone alteration of natural protein sequences, through which a subset of the side chains is displayed on an unnatural building block to generate a heterogeneous backbone...
May 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28496324/preparation-of-zein-nanoparticles-by-using-solution-enhanced-dispersion-with-supercritical-co2-and-elucidation-with-computational-fluid-dynamics
#5
Sining Li, Yaping Zhao
Nanoparticles have attracted more and more attention in the medicinal field. Zein is a biomacromolecule and can be used as a carrier for delivering active ingredients to prepare controlled release drugs. In this article, we presented the preparation of zein nanoparticles by solution-enhanced dispersion by supercritical CO2 (SEDS) approach. Scanning electron microscopy and transmission electron microscopy were applied to characterize the size and morphology of the obtained particles. The nozzle structure and the CO2 flow rate greatly affected the morphology and the size of the particles...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28494740/nucleic-acids-based-nanotherapeutics-crossing-the-blood-brain-barrier
#6
Noha Nafee, Noha Gouda
The restless endeavors revealing the molecular pathways underlying many neurodegenerative diseases and brain tumors have paved the way for the introduction of the selective exogenous gene-based therapeutics. The implicated active biomolecules encompass mainly negatively-charged nucleic acids ranging from DNA, mRNA, non-coding RNAs (small-interfering RNA, siRNA, and microRNA, miRNA), to antisense oligonucleotides. They selectively interfere with the genes translational and/or transcriptional processes. Although many reviews previously addressed brain targeting, a thorough correlation between the molecular properties of these biomacromolecules, the nature of blood brain barrier (BBB) in the accompanying pathological condition, the intracellular targets, as well as the design of the delivery system which will transport the bioactive cargo to the target cells attempting efficient delivery to the active sites in the brain will be appraised...
May 10, 2017: Current Gene Therapy
https://www.readbyqxmd.com/read/28494275/synthetic-biological-approaches-for-rna-labelling-and-imaging-design-principles-and-future-opportunities
#7
REVIEW
Steven Pauff, Jamie M Withers, Iain Jw McKean, Simon P Mackay, Glenn A Burley
RNA is the most mercurial of all biomacromolecules. In contrast to DNA, where the predominant role is the storage of genetic information, the biological role of RNA varies; ranging from a template-based intermediary in gene expression to playing a direct role in catalysis. Their high turnover and metabolic lability makes the detection of specific sequences particularly challenging. This review describes the latest synthetic biological developments that enable the direct imaging of RNA both in vitro and in their native cellular environment...
May 8, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28490237/phytochemistry-and-pharmacological-activities-of-the-genus-swertia-gentianaceae-a-review
#8
Jie Li, Yan-Li Zhao, Heng-Yu Huang, Yuan-Zhong Wang
Swertia plants have been considered to be medicinal plants useful for the treatment of various ailments for thousands of years, especially in Asian countries. This is due to the broad variety of chemical compounds that provide multiple ligands for bonding to different endogenous biomacromolecules for patients. Chemical constituents and pharmacological activities of Swertia plants are summarized in this paper. Approximately 419 metabolites and 40 bioactive compounds have been reported from 30 Swertia species, including xanthones, flavonoids, seco-iridiods, iridiods, triterpenoids, alkaloids, volatiles, and other secondary metabolites...
May 11, 2017: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/28489346/metal-organic-frameworks-at-the-biointerface-synthetic-strategies-and-applications
#9
Christian Doonan, Raffaele Riccò, Kang Liang, Darren Bradshaw, Paolo Falcaro
Many living organisms are capable of producing inorganic materials of precisely controlled structure and morphology. This ubiquitous process is termed biomineralization and is observed in nature from the macroscale (e.g., formation of exoskeletons) down to the nanoscale (e.g., mineral storage and transportation in proteins). Extensive research efforts have pursued replicating this chemistry with the overarching aims of synthesizing new materials of unprecedented physical properties and understanding the complex mechanisms that occur at the biological-inorganic interface...
May 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28482223/biological-effects-of-%C3%AE-adrenergic-phentolamine-on-erythrocyte-hemeprotein-molecular-insights-from-biorecognition-behavior-protein-dynamics-and-flexibility
#10
Wei Peng, Fei Ding, Yu-Kui Peng, Yong Xie
Phentolamine is one of the most representative nonselective α-adrenoreceptor blocking agents, which have been proved to be owned various pharmacological actions. Unfortunately, whether erythrocytes in the veins intervene in biological behaviors of such drug are largely obscured. With the aid of multiple biophysical techniques, this scenario was to detailed explore the potential biorecognition between phentolamine and the hemeprotein in the cytosol of erythrocytes, and the influences of dynamic characters of protein during the bioreaction...
April 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28482159/cascading-effects-of-nanoparticle-coatings-surface-functionalization-dictates-the-assemblage-of-complexed-proteins-and-subsequent-interaction-with-model-cell-membranes
#11
Eric S Melby, Samuel E Lohse, Ji Eun Park, Ariane M Vartanian, Rebecca A Putans, Hannah B Abbott, Robert J Hamers, Catherine J Murphy, Joel A Pedersen
Interactions of functionalized nanomaterials with biological membranes are expected to be governed by not only nanoparticle physiochemical properties, but also coatings or "coronas" of biomacromolecules acquired after emersion in biological fluids. Here, we prepared a library of 4-5 nm gold nanoparticles (AuNPs) coated with either ω-functionalized thiols or polyelectrolyte wrappings to examine the influence of surface functional groups on the assemblage of proteins complexing the nanoparticles and its subsequent impact on attachment to model biological membranes...
May 8, 2017: ACS Nano
https://www.readbyqxmd.com/read/28474899/liquefaction-of-biopolymers-solvent-free-liquids-and-liquid-crystals-from-nucleic-acids-and-proteins
#12
Kai Liu, Chao Ma, Robert Göstl, Lei Zhang, Andreas Herrmann
Biomacromolecules, such as nucleic acids, proteins, and virus particles, are persistent molecular entities with dimensions that exceed the range of their intermolecular forces hence undergoing degradation by thermally induced bond-scission upon heating. Consequently, for this type of molecule, the absence of a liquid phase can be regarded as a general phenomenon. However, certain advantageous properties usually associated with the liquid state of matter, such as processability, flowability, or molecular mobility, are highly sought-after features for biomacromolecules in a solvent-free environment...
May 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28468314/carbon-nanotube-membranes-synthesis-properties-and-future-filtration-applications
#13
REVIEW
Md Harun-Or Rashid, Stephen F Ralph
Over the course of the past decade, there has been growing interest in the development of different types of membranes composed of carbon nanotubes (CNTs), including buckypapers and composite materials, for an ever-widening range of filtration applications. This article provides an overview of how different types of CNT membranes are prepared and the results obtained from investigations into their suitability for different applications. The latter involve the removal of small particles from air samples, the filtration of aqueous solutions containing organic compounds and/or bacteria, and the separation of individual liquids present in mixtures...
May 1, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28452748/soleil-shining-on-the-solution-state-structure-of-biomacromolecules-by-synchrotron-x-ray-footprinting-at-the-metrology-beamline
#14
A Baud, L Aymé, F Gonnet, I Salard, Y Gohon, P Jolivet, K Brodolin, P Da Silva, A Giuliani, B Sclavi, T Chardot, P Mercère, P Roblin, R Daniel
Synchrotron X-ray footprinting complements the techniques commonly used to define the structure of molecules such as crystallography, small-angle X-ray scattering and nuclear magnetic resonance. It is remarkably useful in probing the structure and interactions of proteins with lipids, nucleic acids or with other proteins in solution, often better reflecting the in vivo state dynamics. To date, most X-ray footprinting studies have been carried out at the National Synchrotron Light Source, USA, and at the European Synchrotron Radiation Facility in Grenoble, France...
May 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28447792/-liquid-crystalline-nanoparticles-rationally-designed-vehicle-to-improve-stability-and-therapeutic-efficacy-of-insulin-following-oral-administration
#15
Ashish Kumar Agrawal, Kuldeep Kumar, Nitin Kumar Swarnakar, Varun Kushwah, Sanyog Jain
In the present article we investigate the feasibility of liquid crystalline nanoparticles (LCNPs) to improve the stability and therapeutic efficacy of insulin following oral administration. Compatibility studies of different formulation ingredients with insulin and extensive optimization of different process variables resulted into the formation of LCNPs with particle size of 245.50 ± 6.36 nm, PDI of 0.220 ± 0.042, and zeta potential of -18.30 ± 1.27 mV with an entrapment efficiency of 44.17 ± 1.47%. Mannitol (5% w/v) was identified as a suitable cryoprotectant to produce freeze-dried LCNPs without affecting their critical quality attributes...
May 3, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28423958/strategies-and-perspectives-of-assembling-multi-enzyme-systems
#16
Shi-Zhen Wang, Yong-Hui Zhang, Hong Ren, Ya-Li Wang, Wei Jiang, Bai-Shan Fang
Multi-enzyme complexes have the potential to achieve high catalytic efficiency for sequence reactions due to their advantages in eliminating product inhibition, facilitating intermediate transfer and in situ regenerating cofactors. Constructing functional multi-enzyme systems to mimic natural multi-enzyme complexes is of great interest for multi-enzymatic biosynthesis and cell-free synthetic biotransformation, but with many challenges. Currently, various assembly strategies have been developed based on the interaction of biomacromolecules such as DNA, peptide and scaffolding protein...
April 20, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28423276/supramolecular-%C3%AE-sheets-stabilized-protein-nanocarriers-for-drug-delivery-and-gene-transfection
#17
Yuan Ping, Dawei Ding, Ricardo A N S Ramos, Harini Mohanram, Kanagavel Deepankumar, Jianqing Gao, Guping Tang, Ali Miserez
Suckerin proteins, recently discovered in the sucker ring teeth of squids, represent a family of promising structural biomacromolecules that can form supramolecular networks stabilized by nanoconfined β-sheets. Exploiting this feature as well as their specific amino acid composition, we demonstrate that artificial suckerin-19 (S-19) can be engineered into nanocarriers for efficient drug delivery and gene transfection in vitro and in vivo. First, we demonstrate that S-19 self-assembles into β-sheet stabilized nanoparticles with controlled particle sizes of 100-200 nm that are able to encapsulate hydrophobic drugs for pH-dependent release in vitro, and that can effectively inhibit tumor growth in vivo...
April 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28422491/discovery-of-novel-ligands-for-tnf-%C3%AE-and-tnf-receptor-1-through-structure-based-virtual-screening-and-biological-assay
#18
Si Chen, Zhiwei Feng, Yun Wang, Shifan Ma, Ziheng Hu, Peng Yang, Yifeng Chai, Xiangqun Xie
Tumor necrosis factor α (TNF-α) is overexpressed in various diseases, and it has been a validated therapeutic target for autoimmune diseases. All therapeutics currently used to target TNF-α are biomacromolecules, and limited numbers of TNF-α chemical inhibitors have been reported, which makes the identification of small-molecule alternatives an urgent need. Recent studies have mainly focused on identifying small molecules that directly bind to TNF-α or TNF receptor-1 (TNFR1), inhibit the interaction between TNF-α and TNFR1, and/or regulate related signaling pathways...
May 11, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28422208/encapsulation-into-complex-coacervate-core-micelles-promotes-egfp-dimerization
#19
A Nolles, N J E van Dongen, A H Westphal, A J W G Visser, J M Kleijn, W J H van Berkel, J W Borst
Complex coacervate core micelles (C3Ms) are colloidal structures useful for encapsulation of biomacromolecules. We previously demonstrated that enhanced green fluorescent protein (EGFP) can be encapsulated into C3Ms using the diblock copolymer poly(2-methyl-vinyl-pyridinium)41-b-poly(ethylene-oxide)205. This packaging resulted in deviating spectroscopic features of the encapsulated EGFP molecules. Here we show that for monomeric EGFP variant (mEGFP) micellar encapsulation affects the absorption and fluorescence properties to a much lesser extent, and that changes in circular dichroism characteristics are specific for encapsulated EGFP...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28418639/supermagnetically-tuned-halloysite-nanotubes-functionalized-with-aminosilane-for-covalent-laccase-immobilization
#20
Avinash A Kadam, Jiseon Jang, Dae Sung Lee
Halloysite nanotubes (HNTs) were tuned with supermagnetic Fe3O4 (M-HNTs) and functionalized with γ-aminopropyltriethoxysilane (APTES) (A-M-HNTs). Gluteraldehyde (GTA) was linked to A-M-HNTs (A-M-HNTs-GTA) and explored for covalent laccase immobilization. The structural characterization of M-HNTs, A-M-HNTs, and A-M-HNTs-GTA-immobilized laccase (A-M-HNTs-GTA-Lac) was determined by X-ray photoelectron spectroscopy, field-emission high-resolution transmission electron microscopy, a magnetic property measurement system, and thermogavimetric analyses...
April 25, 2017: ACS Applied Materials & Interfaces
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