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https://www.readbyqxmd.com/read/28747503/identification-of-vaccinia-virus-replisome-and-transcriptome-proteins-by-ipond-coupled-with-mass-spectrometry
#1
Tatiana G Senkevich, George Katsafanas, Andrea Weisberg, Lisa R Olano, Bernard Moss
Poxviruses replicate within the cytoplasm and encode proteins for DNA and mRNA synthesis. To investigate poxvirus replication and transcription from a new perspective, we incorporated 5-ethynyl-2' -deoxyuridine (EdU) into nascent DNA in cells infected with vaccinia virus (VACV). The EdU-labeled DNA was conjugated to fluor- or biotin-azide and visualized by confocal, super resolution and transmission electron microscopy. Nuclear labeling decreased dramatically after infection, accompanied by intense labeling of cytoplasmic foci...
July 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28745492/amphiphilic-polysaccharide-block-copolymers-for-ph-responsive-micellar-nanoparticles
#2
Benjamin B Breitenbach, Ira Schmid, Peter R Wich
A full polysaccharide amphiphilic block copolymer was prepared from end group-functionalized dextrans using copper mediated azide-alkyne click chemistry. Sufficient modification of the reducing end in both blocks was achieved by microwave-enhanced reductive amination in a borate-buffer/methanol solvent system. The combination of a hydrophilic dextran block with a hydrophobic acetalated dextran block results in an amphiphilic structure that turns water-soluble upon acid treatment. The material has a low CMC and self-assembles in water to spherical micellar nanoparticles...
July 26, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28745060/tunable-fluorescence-of-a-semiconducting-polythiophene-positioned-on-dna-origami
#3
Johanna Zessin, Franziska Fischer, Andreas Heerwig, Alfred Kick, Susanne Boye, Manfred Stamm, Anton Kiriy, Michael Mertig
A novel approach for the integration of π-conjugated polymers (CPs) into DNA-based nanostructures is presented. Using the controlled Kumada catalyst-transfer polycondensation, well-defined thiophene-based polymers with controllable molecular weight, specific end groups and water-soluble oligoethylene glycol-based side chains were synthesized. The end groups were used for the easy but highly efficient click chemistry-based attachment of end-functionalized oligodeoxynucleotides (ODNs) with predesigned sequences...
July 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28743396/synthesis-of-hydrogel-via-click-chemistry-for-dna-electrophoresis
#4
Chiara Finetti, Laura Sola, Jim Elliott, Marcella Chiari
This work introduces a novel sieving gel for DNA electrophoresis using a classical click chemistry reaction, the copper (I)-catalyzed azide-alkyne cycloaddition (CuAAC), to cross-link functional polymer chains. The efficiency of this reaction provides, under mild conditions, hydrogels with near-ideal network connectivity and improved physical properties. Hydrogel formation via click chemistry condensation of functional polymers does not involve the use of toxic monomers and UV initiation. The performance of the new hydrogel in the separation of double stranded DNA fragments was evaluated in the 2200 TapeStation system, an analytical platform, recently introduced by Agilent that combines the advantages of CE in terms of miniaturization and automation with the simplicity of use of slab gel electrophoresis...
July 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28740606/structure-guided-strategy-for-the-development-of-potent-bivalent-erk-inhibitors
#5
Bernhard C Lechtenberg, Peter D Mace, E Hampton Sessions, Robert Williamson, Romain Stalder, Yann Wallez, Gregory P Roth, Stefan J Riedl, Elena B Pasquale
ERK is the effector kinase of the RAS-RAF-MEK-ERK signaling cascade, which promotes cell transformation and malignancy in many cancers and is thus a major drug target in oncology. Kinase inhibitors targeting RAF or MEK are already used for the treatment of certain cancers, such as melanoma. Although the initial response to these drugs can be dramatic, development of drug resistance is a major challenge, even with combination therapies targeting both RAF and MEK. Importantly, most resistance mechanisms still rely on activation of the downstream effector kinase ERK, making it a promising target for drug development efforts...
July 13, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28740382/dual-linker-gold-nanoparticles-as-adjuvanting-carriers-for-multivalent-display-of-recombinant-influenza-hemagglutinin-trimers-and-flagellin-improve-the-immunological-responses-in-vivo-and-in-vitro
#6
Chao Wang, Wandi Zhu, Bao-Zhong Wang
Vaccination is the most cost-effective means of infectious disease control. Although current influenza vaccines are effective in battling closely matched strains, such vaccines have major limitations such as the requirement to produce new vaccines every season, an egg-dependent production system, long production periods, uncertainty in matching the vaccine to circulating strains, and the inability to react to new influenza pandemics resulting from genetic drift or shift. To overcome the intrinsic limitations of the conventional influenza vaccine, we have designed dual-linker gold nanoparticles (AuNPs) conjugated with both recombinant trimetric A/Aichi/2/68 (H3N2), hemagglutinin (HA) and TLR5 agonist flagellin (FliC) as a novel vaccine approach...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28738291/inflammation-responsive-self-regulated-drug-release-from-ultrathin-hydrogel-coating
#7
Min He, Qian Wang, Zhenqiang Shi, Yi Xie, Weifeng Zhao, Changsheng Zhao
Heterotopic ossification(HO) is a potential severe complication after many biomaterial implanting surgeries, and the inflammation environment caused by the implanting-associated infections is considered as the main nosogenesis. Herein, an inflammation-responsive drug release system was designed by chemically conjugating indometacin (via ester group) onto hydrogel coating to realize local self-regulated drug release to prevent HO. In our strategy, poly(3-mercaptopropyl)trimethoxysilane-co-acrylic acrylate and polyvinyl alcohol (providing anchoring sites for drug molecules) were firstly synthesized and functionalized with ene-groups, then a hydrogel layer was formed and covalently attached onto thiol-modified substrate via thiol-ene click chemistry, followed by grafting indometacin...
July 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28738228/streptavidin-hydrogel-prepared-by-sortase-a-assisted-click-chemistry-for-enzyme-immobilization-on-an-electrode
#8
Takuya Matsumoto, Yuki Isogawa, Tsutomu Tanaka, Akihiko Kondo
A tetrameric streptavidin (SA)-appended LPETG tag was site-specifically linked to azido-containing tri-glycine via sortase A catalysis and the resulting azido-modified SA (SA-N3) was retained in the biotin-binding pocket. SA-N3 was polymerized with dibenzylcyclooctyne-modified branched poly(ethyleneglycol) (DBCO-PEG) using azido-modified branched PEG (N3-PEG) as a spacer via copper-free click chemistry. The resulting SA-based hydrogel exhibited gel-like mechanical properties and could immobilize biotin-modified molecules through biotin-SA affinity...
July 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28736786/an-enzyme-free-flow-cytometric-bead-assay-for-the-sensitive-detection-of-micrornas-based-on-click-nucleic-acid-ligation-mediated-signal-amplification
#9
Yan Qi, Liying Qiu, Wenjiao Fan, Chenghui Liu, Zhengping Li
A versatile flow cytometric bead assay (FCBA) coupled with a completely enzyme-free signal amplification mechanism is developed for the sensitive detection of microRNAs (miRNAs). This new strategy integrates click chemistry-mediated ligation chain reaction (CLCR) with hybridization chain reaction (HCR) for enzyme-free signal amplification on magnetic beads (MBs), and a flow cytometer for the robust fluorescence readout of the MBs. Firstly, target miRNA can initiate CLCR on the surface of MBs based on the click chemical ligation between dibenzocyclooctyne (DBCO)- and azide-modified single-stranded DNA (ssDNA) probes, and the amount of ligated ssDNA sequences on the MBs will be proportional to the dosage of target miRNA...
July 24, 2017: Analyst
https://www.readbyqxmd.com/read/28732952/ultrasound-promoted-direct-functionalization-of-multi-walled-carbon-nanotubes-in-water-via-diels-alder-click-chemistry
#10
Cuong M Q Le, Xuan Thang Cao, Kwon Taek Lim
A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder "click chemistry". Firstly, the copolymers of poly(styrene-alt-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28722729/a-healable-thermo-reversible-functional-polymer-prepared-via-raft-polymerization-and-ultrafast-click-chemistry-using-a-triazolinedione-derivative
#11
Prantik Mondal, Prasanta Kumar Behera, Nikhil K Singha
This communication reports the preparation and characterization of a functional polymer bearing a pendant indole group via a reversible-addition fragmentation and chain transfer (RAFT) process followed by its modification via an Alder-ene 'click' reaction using a 1,2,4-triazoline-3,5-dione (TAD) derivative. The resultant functional polymer showed thermo-reversible as well as healing characteristics.
July 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28719058/corrigendum-click-chemistry-mediated-rapid-microbubble-capture-for-acute-thrombus-ultrasound-molecular-imaging
#12
Tuantuan Wang, Chuxiao Yuan, Bingyang Dai, Yang Liu, Mingxi Li, Zhenqiang Feng, Qing Jiang, Zhihong Xu, Ningwei Zhao, Ning Gu, Fang Yang
No abstract text is available yet for this article.
July 18, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28712709/synthesis-and-biological-evaluation-of-novel-1-2-3-triazole-derivatives-as-anti-tubercular-agents
#13
Abdul Aziz Ali, Dhrubajyoti Gogoi, Amrita K Chaliha, Alak K Buragohain, Priyanka Trivedi, Prakash J Saikia, Praveen S Gehlot, Arvind Kumar, Vinita Chaturvedi, Diganta Sarma
A library of seventeen novel 1,2,3-triazole derivatives were efficiently synthesized in excellent yields by the popular 'click chemistry' approach and evaluated in vitro for their anti-tubercular activity against Mycobacterium tuberculosis H37Ra (ATCC 25177 strain). Among the series, six compounds exhibited significant activity with minimum inhibitory concentration (MIC) values ranging from 3.12 to 0.78μg/mL and along with no significant cytotoxicity against MBMDMQs (mouse bone marrow derived macrophages)...
July 5, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28707880/pinpoint-chemical-modification-of-the-quinone-access-channel-of-mitochondrial-complex-i-via-a-two-step-conjugation-reaction
#14
Takahiro Masuya, Masatoshi Murai, Takeshi Ito, Shunsuke Aburaya, Wataru Aoki, Hideto Miyoshi
We previously showed that a bulky ring-strained cycloalkyne possessing a rhodamine fluorophore directly reacts (via strain-promoted click chemistry) with the azido group incorporated (via ligand-directed tosyl chemistry) into Asp160 in the 49 kDa subunit of complex I in bovine heart submitochondrial particles [Masuya et al. (2014) Biochemistry 53, 7816-7823]. This two-step conjugation may be a promising technique for specific chemical modifications of the quinone-access channel in complex I by various molecular probes, which would lead to new methodologies for studying the enzyme...
July 14, 2017: Biochemistry
https://www.readbyqxmd.com/read/28702658/overcoming-multidrug-resistance-using-folate-receptor-targeted-and-ph-responsive-polymeric-nanogels-containing-covalently-entrapped-doxorubicin
#15
Y Chen, O Tezcan, D Li, N Beztsinna, B Lou, T Etrych, K Ulbrich, J M Metselaar, T Lammers, W E Hennink
Multidrug resistance (MDR) contributes to failure of chemotherapy. We here show that biodegradable polymeric nanogels are able to overcome MDR via folic acid targeting. The nanogels are based on hydroxyethyl methacrylamide-oligoglycolates-derivatized poly(hydroxyethyl methacrylamide-co-N-(2-azidoethyl)methacrylamide) (p(HEMAm-co-AzEMAm)-Gly-HEMAm), covalently loaded with the chemotherapeutic drug doxorubicin (DOX) and subsequently decorated with a folic acid-PEG conjugate via copper-free click chemistry. pH-Responsive drug release is achieved via the acid-labile hydrazone bond between DOX and the methacrylamide polymeric network...
July 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28700110/copper-alkyne-complexation-is-responsible-for-the-nucleolar-localisation-of-quadruplex-nucleic-acid-drugs-labelled-by-click-chemistry
#16
Marie-Paule Teulade-Fichou, Joël Lefebvre, Corinne Guetta, Florent Poyer, Florence Mahuteau-Betzer
G-quadruplex(es) (G4) are non-canonical nucleic acid structures found in guanine-rich sequences. They can be targeted with small molecules (G4-ligands) acting as reporters, for tracking both in vitro and in cells. We explored the cellular localisation of PhenDC3, one of the most powerful G4 ligands, by synthesising two clickable azide and alkyne derivatives (PhenDC3-alk, PhenDC3-az) and labelling them in situ with the corresponding Cy5 click partners. A careful comparison of the results obtained for the copper-based CuAAC and copper-free SPAAC methodologies in fixed cells implicated Cu(I) /alkyne intermediates in the non-specific localisation of ligands (and fluorophores) to the nucleoli...
July 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28696391/site-specific-pegylated-adeno-associated-viruses-with-increased-serum-stability-and-reduced-immunogenicity
#17
Tianzhuo Yao, Xueying Zhou, Chuanling Zhang, Xiaojuan Yu, Zhenyu Tian, Lihe Zhang, Demin Zhou
Adeno-associated virus (AAV) is one of the most extensively studied and utilized viral vectors in clinical gene transfer research. However, the serum instability and immunogenicity of AAV vectors significantly limit their application. Here, we endeavored to overcome these limitations by developing a straightforward approach for site-specific PEGylation of AAV via genetic code expansion. This technique includes incorporation of the azide moiety into the AAV capsid protein followed by orthogonal and stoichiometric conjugation of a variety of polyethylene glycols (PEGs) through click chemistry...
July 11, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28695735/investigation-and-demonstration-of-catalyst-initiator-driven-selectivity-in-thiol-michael-reactions
#18
Stephen H Frayne, Raghavendra R Murthy, Brian H Northrop
Thiol-Michael 'click' reactions are essential synthetic tools in the preparation of various materials including polymers, dendrimers, and other macromolecules. In spite of increasing efforts to apply thiol-Michael chemistry in a controlled fashion, the selectivity of base- or nucleophile-promoted thiol-Michael reactions in complex mixtures of multiple thiols and/or acceptors remains largely unknown. Herein, we report a thorough fundamental study of the selectivity of the thiol-Michael reactions through a series of 270 ternary reactions, using 1H NMR spectroscopy to quantify product selectivity...
July 11, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28695507/identification-of-protein-substrates-of-specific-parp-enzymes-using-analog-sensitive-parp-mutants-and-a-clickable-nad-analog
#19
Bryan A Gibson, W Lee Kraus
The PARP family of ADP-ribosyl transferases contains 17 members in human cells, most of which catalyze the transfer of the ADP-ribose moiety of NAD(+) onto their target proteins. This posttranslational modification plays important roles in cellular signaling, especially during cellular stresses, such as heat shock, inflammation, unfolded protein responses, and DNA damage. Knowing the specific proteins that are substrates for individual PARPs, as well as the specific amino acid residues in a given target protein that are ADP-ribosylated, is a key step in understanding the biology of individual PARPs...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28694021/recombinant-and-chemo-bio-orthogonal-synthesis-of-liposomal-thrombomodulin-and-its-antithrombotic-activity
#20
Lin Wang, Rui Jiang, Yang Liu, Maosheng Cheng, Qingyu Wu, Xue-Long Sun
Thrombomodulin (TM) is an endothelial cell membrane protein that acts as a major cofactor in the protein C anticoagulant pathway. The EGF-like domains 4-6 of TM (TM456) are essential for PC activation. In this study, we proposed a liposomal recombinant TM conjugate to mimic the membrane TM structure and its anticoagulant activity. First, a DSPE-PEG2000-TM456 was successfully synthesized by site-specific conjugation of azido-TM456 with DSPE-PEG2000-DBCO via copper-free click chemistry quantitatively. Then, liposome-TM456 was fabricated via direct liposome formation with the DSPE-PEG2000-TM456 and other lipids...
July 7, 2017: Journal of Bioscience and Bioengineering
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