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Biomacromolecule

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https://read.qxmd.com/read/30785035/gold-nanoparticle-carboxymethyl-cellulose-nanocolloids-for-detection-of-human-immunodeficiency-virus-type-1-hiv-1-using-laser-light-scattering-immunoassay
#1
A J Caires, H S Mansur, A A P Mansur, S M Carvalho, Z I P Lobato, J K P Dos Reis
It is estimated that over 100 million people have been infected with human immunodeficiency virus (HIV-1) resulting in approximately 30 million deaths globally. Herein, we designed and developed novel nano-immunoconjugates using gold nanoparticles (AuNPs) and carboxymethylcellulose (CMC) biopolymer, which performed simultaneously as an eco-friendly in situ reducing agent and surface stabilizing ligand for the aqueous colloidal process. These AuNPs-CMC nanocolloids were biofunctionalized with the gp41 glycoprotein receptor (AuNPs-CMC-gp41) or HIV monoclonal antibodies (AuNPs-CMC_PolyArg-abHIV) for detection using the laser light scattering immunoassay (LIA)...
February 15, 2019: Colloids and Surfaces. B, Biointerfaces
https://read.qxmd.com/read/30778067/double-helical-conformation-and-extreme-rigidity-in-a-rodlike-polyelectrolyte
#2
Ying Wang, Yadong He, Zhou Yu, Jianwei Gao, Stephanie Ten Brinck, Carla Slebodnick, Gregory B Fahs, Curt J Zanelotti, Maruti Hegde, Robert B Moore, Bernd Ensing, Theo J Dingemans, Rui Qiao, Louis A Madsen
The ubiquitous biomacromolecule DNA has an axial rigidity persistence length of ~50 nm, driven by its elegant double helical structure. While double and multiple helix structures appear widely in nature, only rarely are these found in synthetic non-chiral macromolecules. Here we report a double helical conformation in the densely charged aromatic polyamide poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide) or PBDT. This double helix macromolecule represents one of the most rigid simple molecular structures known, exhibiting an extremely high axial persistence length (~1 micrometer)...
February 18, 2019: Nature Communications
https://read.qxmd.com/read/30771977/a-choline-chloride-acrylic-acid-deep-eutectic-solvent-polymer-based-on-fe-3-o-4-particles-and-mos-2-sheets-poly-chcl-aa-des-fe-3-o-4-mos-2-with-specific-recognition-and-good-antibacterial-properties-for-%C3%AE-lactoglobulin-in-milk
#3
Najing Fu, Liteng Li, Kaijing Liu, Chan Kyung Kim, Jun Li, Tao Zhu, Jianheng Li, Baokun Tang
With the development of deep eutectic solvents (DESs), more DES-based functional materials have been explored and applied in various areas. In this work, a novel choline chloride-acrylic acid (ChCl-AA) DES polymer, on a 2D magnetic base, was prepared for the recognition of β-lactoglobulin (β-LG) biomacromolecules in milk and for the inhibition of common bacteria such as Escherichia coli (E. coli), Pseudomonas fluorescens (P. fluorescens), Staphylococcus aureus (S. aureus), and Bacillus subtilis (B. subtilis)...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771394/dissolution-regeneration-and-characterization-of-curdlan-in-the-ionic-liquid-1-ethyl-3-methylimidazolium-acetate
#4
Wenqiang Bai, Faisal Shah, Qiang Wang, Hongzhi Liu
In this work, a novel green solvent based on the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate (EmimAc) with a superior dissolving ability to biomacromolecules was utilized to boost solubility of water-insoluble curdlan. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), circular dichroism (CD), and nuclear magnetic resonance (NMR) were used to characterize the structural changes of curdlan before and after regeneration. Thermal decomposition property of curdlan was also investigated using thermal gravimetric analysis (TGA)...
February 13, 2019: International Journal of Biological Macromolecules
https://read.qxmd.com/read/30740889/biomacromolecule-functionalized-aiegens-for-advanced-biomedical-studies
#5
REVIEW
Feng Wu, Xia Wu, Zhijuan Duan, Yu Huang, Xiaoding Lou, Fan Xia
The advances in bioinformatics and biomedicine have promoted the development of biomedical imaging and theranostic systems to respectively extend the endogenous biomarker imaging with high contrast and enhance the therapeutic effect with high efficiency. The emergence of biomacromolecule-functionalized aggregation-induced emitters (AIEgens), utilizing AIEgens, and biomacromolecules (nucleic acids, peptides, glycans, and lipids), displays specific targeting ability to cancer cell, improved biocompatibility, reduced toxicity, enhanced therapeutic effect, and so forth...
February 10, 2019: Small
https://read.qxmd.com/read/30734041/non-gaussian-non-ergodic-and-non-fickian-diffusion-of-tracers-in-mucin-hydrogels
#6
Andrey G Cherstvy, Samudrajit Thapa, Caroline E Wagner, Ralf Metzler
Native mucus is polymer-based soft-matter material of paramount biological importance. How non-Gaussian and non-ergodic is the diffusive spreading of pathogens in mucus? We study the passive, thermally driven motion of micron-sized tracers in hydrogels of mucins, the main polymeric component of mucus. We report the results of the Bayesian analysis for ranking several diffusion models for a set of tracer trajectories [C. E. Wagner et al., Biomacromolecules, 2017, 18, 3654]. The models with "diffusing diffusivity", fractional and standard Brownian motion are used...
February 8, 2019: Soft Matter
https://read.qxmd.com/read/30733413/an-ingestible-self-orienting-system-for-oral-delivery-of-macromolecules
#7
Alex Abramson, Ester Caffarel-Salvador, Minsoo Khang, David Dellal, David Silverstein, Yuan Gao, Morten Revsgaard Frederiksen, Andreas Vegge, František Hubálek, Jorrit J Water, Anders V Friderichsen, Johannes Fels, Rikke Kaae Kirk, Cody Cleveland, Joy Collins, Siddartha Tamang, Alison Hayward, Tomas Landh, Stephen T Buckley, Niclas Roxhed, Ulrik Rahbek, Robert Langer, Giovanni Traverso
Biomacromolecules have transformed our capacity to effectively treat diseases; however, their rapid degradation and poor absorption in the gastrointestinal (GI) tract generally limit their administration to parenteral routes. An oral biologic delivery system must aid in both localization and permeation to achieve systemic drug uptake. Inspired by the leopard tortoise's ability to passively reorient, we developed an ingestible self-orienting millimeter-scale applicator (SOMA) that autonomously positions itself to engage with GI tissue...
February 8, 2019: Science
https://read.qxmd.com/read/30721538/self-powered-intracellular-drug-delivery-by-a-biomechanical-energy-driven-triboelectric-nanogenerator
#8
Zhirong Liu, Jinhui Nie, Bin Miao, Jiadong Li, Yuanbo Cui, Shu Wang, Xiaodi Zhang, Gengrui Zhao, Yongbo Deng, Yihui Wu, Zhou Li, Linlin Li, Zhong Lin Wang
Nondestructive, high-efficiency, and on-demand intracellular drug/biomacromolecule delivery for therapeutic purposes remains a great challenge. Herein, a biomechanical-energy-powered triboelectric nanogenerator (TENG)-driven electroporation system is developed for intracellular drug delivery with high efficiency and minimal cell damage in vitro and in vivo. In the integrated system, a self-powered TENG as a stable voltage pulse source triggers the increase of plasma membrane potential and membrane permeability...
February 5, 2019: Advanced Materials
https://read.qxmd.com/read/30715857/effect-of-peptide-sequence-on-the-lcst-like-transition-of-elastin-like-peptides-and-elastin-like-peptide-collagen-like-peptide-conjugates-simulations-and-experiments
#9
Ammu Prhashanna, Phillip A Taylor, Jingya Qin, Kristi L Kiick, Arthi Jayaraman
Elastin-like polypeptides (ELPs) are thermoresponsive biopolymers that undergo an LCST-like phase transition in aqueous solutions. The temperature of this LCST-like transition, Tt  , can be tuned by varying the number of repeat units in the ELP, sequence and composition of the repeat units, the solution conditions, and via conjugation to other biomacromolecules. In this study, we show how and why the choice of guest (X) residue in the VPGXG pentad repeat tunes the Tt of short ELPs, (VPGXG)4 , in the free state and when conjugated to collagen-like peptides (CLPs)...
February 4, 2019: Biomacromolecules
https://read.qxmd.com/read/30710179/structural-and-biomechanical-changes-to-dentin-extracellular-matrix-following-chemical-removal-of-proteoglycans
#10
Ana Paula Farina, Cristina M P Vidal, Doglas Cecchin, Thaiane R Aguiar, Ana K Bedran-Russo
Proteoglycans are biomacromolecules with significant biomineralization and structural roles in the dentin extracellular matrix. This study comprehensively assessed the mechanical properties and morphology of the dentin extracellular matrix following chemical removal of proteoglycans to elucidate the structural roles of proteoglycans in dentin. Dentin extracellular matrix was prepared from extracted teeth after complete tissue demineralization. Chemical removal of proteoglycans was carried-out using guanidine hydrochloride for up to 10 days...
February 1, 2019: Odontology
https://read.qxmd.com/read/30695126/dissociative-bioorthogonal-reactions
#11
Julian Tu, Minghao Xu, Raphael Franzini
Bioorthogonal reactions that proceed readily at physiological conditions without interference from biomolecules have found widespread application in the life sciences. Complementary to bioorthogonal reactions that ligate two molecules, there is an increasing interest in reactions that release a molecule or cleave a linker. Such dissociative bioorthogonal reactions have a broad spectrum of uses, for example in controlling biomacromolecule activity, in drug delivery, and in diagnostic assays. The present review article summarizes the developed bioorthogonal reactions linked to a release step, outlines representative areas of applications of such reactions, and discusses aspects that require further improvement...
January 29, 2019: Chembiochem: a European Journal of Chemical Biology
https://read.qxmd.com/read/30694497/in-situ-imaging-and-structure-determination-of-bacterial-toxin-delivery-systems-using-electron-cryotomography
#12
Debnath Ghosal, Mohammed Kaplan, Yi-Wei Chang, Grant J Jensen
Determining the three-dimensional structure of biomacromolecules at high resolution in their native cellular environment is a major challenge for structural biology. Toward this end, electron cryotomography (ECT) allows large bio-macromolecular assemblies to be imaged directly in their hydrated physiological milieu to ~4 nm resolution. Combining ECT with other techniques like fluorescent imaging, immunogold labeling, and genetic manipulation has allowed the in situ investigation of complex biological processes at macromolecular resolution...
2019: Methods in Molecular Biology
https://read.qxmd.com/read/30694286/thermodynamic-modelling-of-acidic-collagenous-solutions-from-free-energy-contributions-to-phase-diagrams
#13
Sayyed Ahmad Khadem, Alejandro D Rey
Tropocollagen is considered one of the main precursors in the fabrication of collagen-based biomaterials. Triple helix acidic solutions of collagen I have been shown experimentally to lead to chiral plywood architectures found in bone and "cornea" like tissues. As these plywoods are solid analogues of liquid crystal architectures, bio-inspired processing and fabrication platforms based on liquid crystal physics and thermodynamics will continue to play an essential role. For tissue engineering applications, it has been shown that dilute isotropic collagen solutions need to be flow processed first and then dehydrated...
January 29, 2019: Soft Matter
https://read.qxmd.com/read/30693696/-application-of-mesenchymal-stem-cells-in-antineoplastic-drugs-delivery-for-tumor-targeted-therapy
#14
Xiaoling Wang, Xumei Ouyang, Xiaoyi Sun
In recent years, a large number of studies have achieved tumor targeting by mesenchymal stem cells (MSC)-based delivery system attributed to the tumor tropism of MSCs. Biomacromolecules and antineoplastic drugs loaded on MSC via internalization or cell membrane anchoring can be released or expressed at tumor site to perform their antitumor effects. The genetically modified MSC are extensively studied, however, the applications of MSCs in targeted delivery of antineoplastic drug with small molecules are not well summarized...
May 25, 2018: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://read.qxmd.com/read/30682774/functional-chitosan-derivative-and-chitin-as-decolorization-materials-for-methylene-blue-and-methyl-orange-from-aqueous-solution
#15
Abdelkader Labidi, Asier M Salaberria, Susana C M Fernandes, Jalel Labidi, Manef Abderrabba
Dyes are classified as one of the major pollutants of water. They have negative impacts not only on environment but also on human health. In fact, wastewater that contains these harmful substances requires many types of treatments. Therefore, alternative methods and adsorption agents are needed. Herein, we propose to evaluate the decolorization of methylene blue (MB) and methyl orange (MO) as two models of soluble dyes from water using chitin and chitosan-graft-polyacrylamide. Furthermore, the applicability of these biomacromolecules as alternative adsorption agents, their sticking probability and desorption were also examined...
January 24, 2019: Materials
https://read.qxmd.com/read/30681683/a-stimuli-responsive-dnazyme-displaying-boolean-logic-gate-responses
#16
Ayaka Banno, Sayuri Higashi, Aya Shibata, Masato Ikeda
Introducing a desired stimuli-responsive function into catalytically active biomacromolecules is potentially useful in developing molecular tools for various bio-applications. In this paper, we discuss the development of a stimuli-responsive DNAzyme (catalytic deoxyribozyme) capable of displaying Boolean logic-gate responses.
January 25, 2019: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30677670/comparative-transcriptomic-analysis-provides-insights-into-the-response-to-the-benzo-a-pyrene-stress-in-aquatic-firefly-luciola-leii
#17
Qi-Lin Zhang, Jun Guo, Xian-Yu Deng, Feng Wang, Jun-Yuan Chen, Lian-Bing Lin
Many studies have reported that behavior and bioluminescence of fireflies could be affected by changes in environment conditions. However, little is known about how the deterioration of the aquatic environment affects aquatic fireflies, particularly with respect to molecular responses following exposure to water pollutants, such as benzo(a)pyrene (BaP), which is a key indicator in environmental risk assessment because of the hazards it poses. Here, whole transcriptome sequencing and gene expression analysis were performed on freshwater fireflies (Luciola leii) exposed to BaP (concentration of 0...
January 15, 2019: Science of the Total Environment
https://read.qxmd.com/read/30676727/clustering-enhancement-of-noisy-cryo-em-sing-particle-images-with-network-structural-similarity-metric
#18
Shuo Yin, Biao Zhang, Yang Yang, Yan Huang, Hong-Bin Shen
The reconstruction of a 3D model from cryo-electron microscopy (cryo-EM) 2D images is currently a mainstream technology for revealing the structure of biomacromolecules. In this structure solution protocol, an important step is to identify each particle's projection orientation. Since the obtained single particle images are often too noisy, clustering is an important step to refrain noise by averaging images within same class. The core of clustering is to put similar cryo-EM images into the same class, hence measurement of similarity between data samples is an essential element in any clustering algorithm...
January 24, 2019: Journal of Chemical Information and Modeling
https://read.qxmd.com/read/30673159/glycosylated-cell-penetrating-peptides-gcpps
#19
Ivan Gallego, Alicia Rioboo, Jose J Reina, Bernardo Díaz, Ángeles Canales, F Javier Cañada, Jorge Guerra-Varela, Laura Sánchez, Javier Montenegro
The cell membrane regulates the exchange of molecules and information with the external environment. However, this control barrier hinders the delivery of exogenous bioactive molecules that can be applied to correct cellular malfunctions. Therefore, the traffic of macromolecules across the cell membrane represents a great challenge for the development of the next generation of therapies and diagnostic methods. Cell penetrating peptides are short peptide sequences capable of delivering a broad range of biomacromolecules across the cellular membrane...
January 23, 2019: Chembiochem: a European Journal of Chemical Biology
https://read.qxmd.com/read/30666316/data-for-ampholytic-ion-exchange-materials-coated-with-small-zwitterions-for-high-efficacy-purification-of-ionizable-soluble-biomacromolecules
#20
Jingjing Rao, Juan Liao, Youquan Bu, Yitao Wang, Xiaolei Hu, Gaobo Long, Mingtong Huang, Luhui Zhong, Xiaolan Yang, Fei Liao
Data in this article are associated with the research article "Ampholytic ion-exchange materials coated with small zwitterion for high-efficacy purification of ionizable soluble biomacromolecules" (Rao et al., 2018) [1]. This article provided data on how to design ampholytic ion-exchange material (AIEM) for the purification of ionizable soluble biomacromolecules for both high activity yields and favorable homogeneity, with two uricases as protein models and a plasmid as DNA model. Data were made publicly available for further analyses...
December 2018: Data in Brief
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