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https://www.readbyqxmd.com/read/28640849/motility-in-blastogregarines-apicomplexa-native-and-drug-induced-organisation-of-siedleckia-nematoides-cytoskeletal-elements
#1
Andrea Valigurová, Naděžda Vaškovicová, Andrei Diakin, Gita G Paskerova, Timur G Simdyanov, Magdaléna Kováčiková
Recent studies on motility of Apicomplexa concur with the so-called glideosome concept applied for apicomplexan zoites, describing a unique mechanism of substrate-dependent gliding motility facilitated by a conserved form of actomyosin motor and subpellicular microtubules. In contrast, the gregarines and blastogregarines exhibit different modes and mechanisms of motility, correlating with diverse modifications of their cortex. This study focuses on the motility and cytoskeleton of the blastogregarine Siedleckia nematoides Caullery et Mesnil, 1898 parasitising the polychaete Scoloplos cf...
2017: PloS One
https://www.readbyqxmd.com/read/28640808/transmembrane-helical-interactions-in-the-cftr-channel-pore
#2
Jhuma Das, Andrei A Aleksandrov, Liying Cui, Lihua He, John R Riordan, Nikolay V Dokholyan
Mutations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene affect CFTR protein biogenesis or its function as a chloride channel, resulting in dysregulation of epithelial fluid transport in the lung, pancreas and other organs in cystic fibrosis (CF). Development of pharmaceutical strategies to treat CF requires understanding of the mechanisms underlying channel function. However, incomplete 3D structural information on the unique ABC ion channel, CFTR, hinders elucidation of its functional mechanism and correction of cystic fibrosis causing mutants...
June 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28640613/molecular-recognition-under-interfacial-conditions-calix-4-pyrrole-based-cross-linkable-micelles-for-ion-pair-extraction
#3
Xiaodong Chi, Gretchen Marie Peters, Forrest Hammel, Chandler Brockman, Jonathan L Sessler
An anthracene-functionalized, long-tailed calix[4]pyrrole 1, containing both an anion-recognition site and cation-recognition functionality, has been synthesized and fully characterized. Upon ion-pair complexation with FeF2, receptor 1 self-assembles into multi-micelles in aqueous media. This aggregation process is ascribed to a change in polarity from non-polar to amphiphilic induced upon concurrent anion and cation complexation and permits molecular recognition-based control over chemical morphology under interfacial conditions...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28640580/a-bio-inspired-alginate-gum-arabic-hydrogel-with-micro-nano-scale-structures-for-controlled-drug-release-in-chronic-wound-healing
#4
Mi Li, Haichang Li, Xiangguang Li, Hua Zhu, Zihui Xu, Lianqing Liu, Jianjie Ma, Mingjun Zhang
Bio-polymeric hydrogels have drawn increasingly research interests in biomaterials due to its tunable physical and chemical properties for both creating bioactive cellular micro-environment and serving as sustainable therapeutic reagents. Inspired by a naturally occurring hydrogel secreted from the carnivorous Sundew plant for trapping insects, here we have developed a bio-inspired hydrogel to deliver mitsugumin53 (MG53), an important protein in cell membrane repair, for chronic wound healing. Both chemical compositions and micro/nano morphological properties inherent from the natural Sundew hydrogel were mimicked using sodium alginate and gum arabic with calcium ion-mediated cross-linking...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28637296/omixcore-a-web-server-for-prediction-of-protein-interactions-with-large-rna
#5
Alexandros Armaos, Davide Cirillo, Gian Gaetano Tartaglia
Summary: Here we introduce omiXcore, a server for calculations of protein binding to large RNAs (> 500 nucleotides). Our webserver allows (i) use of both protein and RNA sequences without size restriction; (ii) pre-compiled library for exploration of human long intergenic RNAs (lincRNAs) interactions; (iii) prediction of binding sites. Results: omiXcore was trained and tested on enhanced UV Cross-Linking and ImmunoPrecipitation (eCLIP) data. The method discriminates interacting and non-interacting protein-RNA pairs and identifies RNA binding sites with Areas under the ROC curve > 0...
June 15, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28637278/functional-and-structural-analysis-of-at-specific-minor-groove-binders-that-disrupt-dna-protein-interactions-and-cause-disintegration-of-the-trypanosoma-brucei-kinetoplast
#6
Cinthia R Millan, Francisco J Acosta-Reyes, Laura Lagartera, Godwin U Ebiloma, Leandro Lemgruber, J Jonathan Nué Martínez, Núria Saperas, Christophe Dardonville, Harry P de Koning, J Lourdes Campos
Trypanosoma brucei, the causative agent of sleeping sickness (Human African Trypanosomiasis, HAT), contains a kinetoplast with the mitochondrial DNA (kDNA), comprising of >70% AT base pairs. This has prompted studies of drugs interacting with AT-rich DNA, such as the N-phenylbenzamide bis(2-aminoimidazoline) derivatives 1 [4-((4,5-dihydro-1H-imidazol-2-yl)amino)-N-(4-((4,5-dihydro-1H-imidazol-2-yl)amino)phenyl)benzamide dihydrochloride] and 2 [N-(3-chloro-4-((4,5-dihydro-1H-imidazol-2-yl)amino)phenyl)-4-((4,5-dihydro-1H-imidazol-2-yl)amino)benzamide] as potential drugs for HAT...
June 16, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28636365/sustainable-elastomers-from-renewable-biomass
#7
Zhongkai Wang, Liang Yuan, Chuanbing Tang
Sustainable elastomers have undergone explosive growth in recent years, partly due to the resurgence of biobased materials prepared from renewable natural resources. However, mounting challenges still prevail: How can the chemical compositions and macromolecular architectures of sustainable polymers be controlled and broadened? How can their processability and recyclability be enabled? How can they compete with petroleum-based counterparts in both cost and performance? Molecular-biomass-derived polymers, such as polymyrcene, polymenthide, and poly(ε-decalactone), have been employed for constructing thermoplastic elastomers (TPEs)...
June 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28636252/influence-of-analyzed-lubricant-volumes-on-the-amount-and-characteristics-of-generated-wear-particles-from-three-different-types-of-polyethylene-liner-materials
#8
Jana Markhoff, Carmen Zietz, Christian Fabry, Gerhard Fulda, Rainer Bader
The articulating components of artificial joints consist mainly of metals, ceramics, or polymers. Resulting abrasive wear particles can promote osteolysis and aseptic loosening of the endo-prosthetic implants. Ultra-high-molecular-weight-polyethylene is the material used most for bearing couples in total hip replacement. In the present study, three types of polyethylene (PE) liners varying in material composition, i.e., (1) conventional PE (C-PE), (2) sequentially cross-linked PE (SX-PE), (3) cross-linked PE blended with vitamin E (EX-PE) articulating with two types of femoral heads were used...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28635414/core-shell-pla-pva-porous-microparticles-as-carriers-for-bacteriocin-nisin
#9
Pavlina Holcapkova, Martina Hrabalikova, Petra Stoplova, Vladimir Sedlarik
This work is focused on preparation of novel porous type of core-shell-structured microparticles based on polylactide (shell) and poly(vinyl alcohol) cross-linked with glutaric acid (GA) (core) prepared by water-in-oil-in-water solvent evaporation technique. The microparticle systems were used as delivery systems for immobilisation of model antibacterial agent - nisin. The effect of cross-linking and the initial amount of nisin on their morphology was investigated using scanning electron microscopy, BET analysis, zeta potential measurement and Fourier transform infra-red spectroscopy...
June 21, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28635253/discovery-and-characterization-of-histidine-oxidation-initiated-cross-links-in-an-igg1-monoclonal-antibody
#10
Chong-Feng Xu, Rachel Chen, Linda Yi, Tim Brantley, Brad Stanley, Zoran Sosic, Li Zang
Novel cross-links between an oxidized histidine and intact histidine, lysine or cysteine were discovered and characterized from high-molecular weight (HMW) fractions of an IgG1 monoclonal antibody (mAb). The mAb HMW fractions were col-lected using preparative size-exclusion chromatography (SEC) and extensively characterized to understand the mechanism of formation of the non-reducible and covalently linked portion of the HMWs. The HMW fractions were IdeS digested, reduced and analyzed by size-exclusion chromatography coupled with mass spectrometry (SEC-MS)...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28634161/oncolytic-adenovirus-expressing-bispecific-antibody-targets-t-cell-cytotoxicity-in-cancer-biopsies
#11
Joshua D Freedman, Joachim Hagel, Eleanor M Scott, Ioannis Psallidas, Avinash Gupta, Laura Spiers, Paul Miller, Nikolaos Kanellakis, Rebecca Ashfield, Kerry D Fisher, Margaret R Duffy, Leonard W Seymour
Oncolytic viruses exploit the cancer cell phenotype to complete their lytic life cycle, releasing progeny virus to infect nearby cells and repeat the process. We modified the oncolytic group B adenovirus EnAdenotucirev (EnAd) to express a bispecific single-chain antibody, secreted from infected tumour cells into the microenvironment. This bispecific T-cell engager (BiTE) binds to EpCAM on target cells and cross-links them to CD3 on T cells, leading to clustering and activation of both CD4 and CD8 T cells. BiTE transcription can be controlled by the virus major late promoter, limiting expression to cancer cells that are permissive for virus replication...
June 20, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28632989/impact-of-interface-mixing-on-the-performance-of-solution-processed-organic-light-emitting-diodes-impedance-and-ultraviolet-photoelectron-spectroscopy-study
#12
Dong A Ahn, Seungjun Lee, JaeGwan Chung, Yongsup Park, Min Chul Suh
We investigated interfacial mixing of solution-processed organic light-emitting devices (OLEDs) using impedance spectroscopy (IS) and ultraviolet photoelectron spectroscopy (UPS) and its impact on device performance. We focused on interfacial mixing between a solution-processed cross-linkable hole transport layer (XM) and an emitting layer (EML), formed either by solution processing or vacuum evaporation. The results of IS and UPS clearly indicated that extensive interfacial mixing was unavoidable, even after the XM was cross-linked to make it insoluble and rinsed to remove residual soluble species, if the subsequent EML was solution processed...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632385/fatigue-resistant-bioinspired-composite-from-synergistic-two-dimensional-nanocomponents
#13
Sijie Wan, Qi Zhang, Xiaohang Zhou, Dechang Li, Baohua Ji, Lei Jiang, Qunfeng Cheng
Portable and wearable electronics require much more flexible graphene-based electrode with high fatigue life, which could repeatedly bend, fold, or stretch without sacrificing its mechanical properties and electrical conductivity. Herein, a kind of ultrahigh fatigue resistant graphene-based nanocomposite via tungsten disulfide (WS2) nanosheets is synthesized by introducing a synergistic effect with covalently cross-linking inspired by the orderly layered structure and abundant interfacial interactions of nacre...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28632302/sequentially-responsive-shell-stacked-nanoparticles-for-deep-penetration-into-solid-tumors
#14
Jinjin Chen, Jianxun Ding, Yucai Wang, Jianjun Cheng, Shengxiang Ji, Xiuli Zhuang, Xuesi Chen
Nanomedicine to overcome both systemic and tumor tissue barriers ideally should have a transformable size and surface, maintaining a certain size and negative surface charge for prolonged circulation, while reducing to a smaller size and switching to a positive surface charge for efficient penetration to and retention in the interstitial space throughout the tumor tissue. However, the design of such size and charge dual-transformable nanomedicine is rarely reported. Here, the design of a shell-stacked nanoparticle (SNP) is reported, which can undergo remarkable size reduction from about 145 to 40 nm, and surface charge reversal from -7...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631478/drying-affects-the-fiber-network-in-low-molecular-weight-hydrogels
#15
Laura L E Mears, Emily R Draper, Ana M Castilla, Hao Su, Zhuola Zhuola, Bart Dietrich, Michael Nolan, Gregory N Smith, James Doutch, Sarah E Rogers, Riaz Akhtar, Honggang Cui, Dave J Adams
Low molecular weight gels are formed by the self-assembly of a suitable small molecule gelator into a three-dimensional network of fibrous structures. The gel properties are determined by the fiber structures, the number and type of cross-links and the distribution of the fibers and cross-links in space. Probing these structures and cross-links is difficult. Many reports rely on microscopy of dried gels (xerogels), where the solvent is removed prior to imaging. The assumption is made that this has little effect on the structures, but it is not clear that this assumption is always (or ever) valid...
June 20, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28631377/state-of-the-art-technologies-to-explore-long-non-coding-rnas-in-cancer
#16
REVIEW
Saeede Salehi, Mohammad Naser Taheri, Negar Azarpira, Abdolhossein Zare, Abbas Behzad-Behbahani
Long non-coding RNAs (lncRNAs) comprise a vast repertoire of RNAs playing a wide variety of crucial roles in tissue physiology in a cell-specific manner. Despite being engaged in myriads of regulatory mechanisms, many lncRNAs have still remained to be assigned any functions. A constellation of experimental techniques including single-molecule RNA in situ hybridization (sm-RNA FISH), cross-linking and immunoprecipitation (CLIP), RNA interference (RNAi), Clustered regularly interspaced short palindromic repeats (CRISPR) and so forth has been employed to shed light on lncRNA cellular localization, structure, interaction networks and functions...
June 19, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28631261/distinct-post-translational-features-of-type-i-collagen-are-conserved-in-mouse-and-human-periodontal-ligament
#17
D M Hudson, M Garibov, D R Dixon, T Popowics, D R Eyre
BACKGROUND AND OBJECTIVE: Specifics of the biochemical pathways that modulate collagen cross-links in the periodontal ligament (PDL) are not fully defined. Better knowledge of the collagen post-translational modifications that give PDL its distinct tissue properties is needed to understand the pathogenic mechanisms of human PDL destruction in periodontal disease. In this study, the post-translational phenotypes of human and mouse PDL type I collagen were surveyed using mass spectrometry...
June 20, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28630861/biophysical-mechanisms-mediating-fibrin-fiber-lysis
#18
REVIEW
Nathan E Hudson
The formation and dissolution of blood clots is both a biochemical and a biomechanical process. While much of the chemistry has been worked out for both processes, the influence of biophysical properties is less well understood. This review considers the impact of several structural and mechanical parameters on lytic rates of fibrin fibers. The influences of fiber and network architecture, fiber strain, FXIIIa cross-linking, and particle transport phenomena will be assessed. The importance of the mechanical aspects of fibrinolysis is emphasized, and future research avenues are discussed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28630474/nanoassembly-routes-stimulate-conflicting-antibody-quantity-and-quality-for-transmission-blocking-malaria-vaccines
#19
Darren B Leneghan, Kazutoyo Miura, Iona J Taylor, Yuanyuan Li, Jing Jin, Karl D Brune, Martin F Bachmann, Mark Howarth, Carole A Long, Sumi Biswas
Vaccine development efforts have recently focused on enabling strong immune responses to poorly immunogenic antigens, via display on multimerisation scaffolds or virus like particles (VLPs). Typically such studies demonstrate improved antibody titer comparing monomeric and nano-arrayed antigen. There are many such studies and scaffold technologies, but minimal side-by-side evaluation of platforms for both the amount and efficacy of antibodies induced. Here we present direct comparison of three leading platforms displaying the promising malaria transmission-blocking vaccine (TBV) target Pfs25...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629592/measurement-and-clinical-utility-of-%C3%AE-ctx-in-serum-and-plasma
#20
Stephen A P Chubb, Samuel D Vasikaran
Biochemical markers of bone turnover (BTM) are released during bone remodeling and can be measured in blood or urine as noninvasive surrogate markers for the bone remodeling rate. The C-terminal cross-linked telopeptide of type I collagen (βCTX) is released during bone resorption and is specific to bone tissue. Assays have been developed to measure βCTX in blood and in urine; most current use of βCTX measurement for research and in clinical practice is performed on a blood sample. Method-specific differences for serum and plasma βCTX have led to initiatives to standardize or harmonize βCTX commercial assays...
2017: Advances in Clinical Chemistry
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