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https://www.readbyqxmd.com/read/29676491/bistetrazine-cyanines-as-double-clicking-fluorogenic-two-point-binder-or-crosslinker-probes
#1
Attila Kormos, Christine Koehler, Eszter Fodor, Zsófia Rutkai, Maddison Martin, Gábor Mező, Edward Lemke, Péter Kele
Fluorogenic probes are capable of minimizing background fluorescence of unreacted and non-specifically adsorbed reagents. The preceding years have brought substantial developments in the design and synthesis of bioorthogonally applicable fluorogenic systems mainly based on the quenching effects of azide and tetrazine moieties. The modulation power exerted by these bioorthogonal motifs typically becomes less efficient on more conjugated systems, i.e. on probes with red-shifted emission wavelength. In order to reach efficient quenching, i...
April 20, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29665096/design-and-synthesis-of-iminosydnones-for-fast-click-and-release-reactions-with-cycloalkynes
#2
Frédéric Taran, Margaux Riomet, Elodie Decuypere, Karine Porte, Sabrina Bernard, Lucie Plougastel, Sergii Kolodych, Davide Audisio
Emerging applications in the field of chemical biology are currently limited by the lack of bioorthogonal reactions allowing both removal and linkage of chemical entities on complex biomolecules. We recently discovered a novel reaction between iminosydnones and strained alkynes leading to two products resulting from ligation and fragmentation of iminosydnones under physiological conditions. We now report the synthesis of a panel of substituted iminosydnones and the structure reactivity relationship between these compounds and strained alkyne partners...
April 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29577125/biotin-functionalized-targeted-polydiacetylene-micelles
#3
Anaëlle Doerflinger, Nam Nguyen Quang, Edmond Gravel, Guillaume Pinna, Marie Vandamme, Frédéric Ducongé, Eric Doris
Polydiacetylene micelles were functionalized with controlled amounts of biotin using bioorthogonal click chemistry. The biotinylated micelles were evaluated in the selective targeting of the MCF-7 cancerous cell line and were shown to be readily internalized. The efficiency of the cellular uptake was correlated to the density of grafted biotin.
March 26, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29531889/early-stage-incorporation-strategy-for-regioselective-labeling-of-peptides-using-the-2-cyanobenzothiazole-1-2-aminothiol-bioorthogonal-click-reaction
#4
Kuo-Ting Chen, Christian Ieritano, Yann Seimbille
Herein, we describe a synthetic strategy for the regioselective labeling of peptides by using a bioorthogonal click reaction between 2-cyanobenzothiazole (CBT) and a 1,2-aminothiol moiety. This methodology allows for the facile and site-specific modification of peptides with various imaging agents, including fluorophores and radioisotope-containing prosthetic groups. We investigated the feasibility of an early-stage incorporation of dipeptide 1 into targeting vectors, such as c[RGDyK(C)] and HER2 pep , during solid-phase peptide synthesis...
March 2018: ChemistryOpen
https://www.readbyqxmd.com/read/29531883/early-stage-incorporation-strategy-for-regioselective-labeling-of-peptides-using-the-2-cyanobenzothiazole-1-2-aminothiol-bioorthogonal-click-reaction
#5
Kuo-Ting Chen, Christian Ieritano, Yann Seimbille
Invited for this month's cover picture is the group of Dr. Yann Seimbille at the Life Sciences Division at TRIUMF (Canada). The cover picture shows how a simple and innovative methodology based on the bioorthogonal click reaction between 2-cyanobenzothiazole and 1,2-aminothiol has been elaborated to facilitate the labeling of peptide biovectors. Read the full text of their Communication at 10.1002/open.201700191.
March 2018: ChemistryOpen
https://www.readbyqxmd.com/read/29493873/rapid-detection-of-copper-in-biological-systems-using-click-chemistry
#6
Wenshu Zheng, Huiling Li, Wenwen Chen, Jiangjiang Zhang, Nuoxin Wang, Xuefeng Guo, Xingyu Jiang
A fast (1 min), straightforward but efficient, click chemistry-based system that enables the rapid detection of free copper (Cu) ions in either biological fluids or living cells without tedious pretreatment is provided. Cu can quickly induce the conjugation between graphene oxide (GO) and a fluorescent dye via click reaction. On the basis of the high specificity of bioorthogonal reaction and the effective quenching ability of GO, the assay studied in this paper can respond to Cu ions in less than 1 min with excellent selectivity and sensitivity, which is the fastest sensor for Cu as far as it is known...
March 1, 2018: Small
https://www.readbyqxmd.com/read/29461645/enzymatic-or-in-vivo-installation-of-propargyl-groups-in-combination-with-click-chemistry-enables-enrichment-and-detection-of-methyltransferase-target-sites-in-rna
#7
Katja Hartstock, Benedikt Nilges, Anna Ovcharenko, Nicolas Cornelissen, Nikolai Puellen, Sebastian Leidel, Andrea Rentmeister
m6A is the most abundant internal modification in eukaryotic mRNA. It is introduced by METTL3-METTL14 and tunes mRNA metabolism, impacting cell differentiation and development. Precise transcriptome-wide assignment of m6A sites is of utmost importance. However, m6A does not interfere with Watson-Crick base pairing making polymerase-based detection challenging. We developed a chemical-biology approach for the precise mapping of methyltransferase (MTase) target sites based on the introduction of a bioorthogonal propargyl group in vitro and in cells...
February 20, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29443107/visualizing-lignification-dynamics-in-plants-with-click-chemistry-dual-labeling-is-bliss
#8
Clémence Simon, Corentin Spriet, Simon Hawkins, Cedric Lion
Lignin is one of the most prevalent biopolymers on the planet and a major component of lignocellulosic biomass. This phenolic polymer plays a vital structural and protective role in the development and life of higher plants. Although the intricate mechanisms regulating lignification processes in vivo strongly impact the industrial valorization of many plant-derived products, the scientific community still has a long way to go to decipher them. In a simple three-step workflow, the dual labeling protocol presented herein enables bioimaging studies of actively lignifying zones of plant tissues...
January 26, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29410228/facile-metabolic-glycan-labeling-strategy-for-exosome-tracking
#9
Tae Sup Lee, Young Kim, Weiqi Zhang, In Ho Song, Ching-Hsuan Tung
BACKGROUND: Exosomes are nano-sized vesicles derived from the fusion of multivesicular bodies with the surrounding plasma membrane. Exosomes have various diagnostic and therapeutic potentials in cancer and other diseases, thus tracking exosomes is an important issue. METHODS: Here, we report a facile exosome labeling strategy using a natural metabolic incorporation of an azido-sugar into the glycan, and a strain-promoted azide-alkyne click reaction. In culture, tetra-acetylated N-azidoacetyl-D-mannosamine (Ac4ManNAz) was spontaneously incorporated into glycans within the cells and later redistributed onto their exosomes...
February 2, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29394044/thermal-stabilization-of-biologics-with-photoresponsive-hydrogels
#10
Balaji V Sridhar, John R Janczy, Øyvind Hatlevik, Gabriel Wolfson, Kristi S Anseth, Mark W Tibbitt
Modern medicine, biological research, and clinical diagnostics depend on the reli- able supply and storage of complex biomolecules. However, biomolecules are inherently susceptible to thermal stress and the global distribution of value-added biologics, including vaccines, biotherapeutics, and Research Use Only (RUO) proteins, requires an integrated cold chain from point of manufacture to point of use. To mitigate reliance on the cold chain, formulations have been engineered to protect biologics from thermal stress, including materials-based strategies that impart thermal stability via direct encapsulation of the molecule...
February 2, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29388773/sydnone-reporters-for-highly-fluorogenic-copper-free-click-ligations
#11
Camille Favre, Lucie de Cremoux, Jerome Badaut, Frédéric Friscourt
Bioorthogonal fluorescent turn-on reactions are attractive for the sensitive real-time detection of a variety of phenomena including bioconjugation, chemical reactivity, and material assembly. Herein we describe the use of 3,4-disubstituted sydnones, a singular class of mesoionic dipoles, for highly fluorescent turn-on copper-free click cycloadditions with the fluorogenic dibenzocyclooctyne Fl-DIBO. Coherent with time-dependent density functional theory calculations, the pyrazole cycloadducts were found to be highly fluorescent with compelling photophysical properties including excellent fluorescence enhancement (up to 240-fold), high quantum yields (over 45%), and large Stokes shift (over 100 nm)...
February 1, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29384666/unraveling-tetrazine-triggered-bioorthogonal-elimination-enables-chemical-tools-for-ultrafast-release-and-universal-cleavage
#12
Jonathan Carlson, Hannes Mikula, Ralph Weissleder
Recent developments in bond cleavage reactions have expanded the scope of bioorthogonal chemistry beyond click ligation and enabled new strategies for probe activation and therapeutic delivery. These applications, however, remain in their infancy, with further innovations needed to achieve the efficiency required for versatile and broadly useful tools in vivo. Amongst these chemistries, the tetrazine/trans-cyclooctene click-to-release reaction has exemplary kinetics and adaptability but achieves only partial release and is incompletely understood, which has limited its application...
January 31, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29356431/precision-fluorescent-labeling-of-an-adeno-associated-virus-vector-to-monitor-the-viral-infection-pathway
#13
Chuanling Zhang, Xueying Zhou, Tianzhuo Yao, Zhenyu Tian, Demin Zhou
Adeno-associated virus 2 (AAV2) is a common vehicle for the delivery of a variety of therapeutic genes. A better understanding of the process of infection of AAV2 will advance our knowledge of AAV2 biology and allow for the optimization of AAV2 capsids with favorable transduction profiles. However, the precise fluorescent labeling of an AAV2 vector for probing virus tracking without affecting the nature of the virus remains a challenge. In this study, a lab-synthesized azide-moieties on the viral capsid at modifiable sites is precisely displayed...
April 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29306547/a-cell-surface-clicked-navigation-system-to-direct-specific-bone-targeting
#14
Young Kim, Zhe Zhang, Jae-Hyuck Shim, Tae Sup Lee, Ching-Hsuan Tung
Cell therapies are promising up-and-coming therapeutic strategies for many diseases. For maximal therapeutic benefits, injected cells have to navigate their way to a designated area, including organ and tissue; unfortunately, the majority of therapeutic cells are currently administered without a guide or homing device. To improve this serious shortcoming, a functionalization method was developed to equip cells with a homing signal. Its application was demonstrated by applying an Azadibenzocyclooctyne-bisphosphonate (ADIBO-BP) and azide paired bioorthogonal chemistry on cells for bone specific homing...
February 1, 2018: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29250049/using-click-chemistry-for-visualizing-in-situ-changes-of-translational-activity-in-planktonic-marine-bacteria
#15
Ainara Leizeaga, Margarita Estrany, Irene Forn, Marta Sebastián
A major challenge in microbial ecology is linking diversity and function to determine which microbes are actively contributing to processes occurring in situ . Bioorthogonal non-canonical amino acid tagging (BONCAT) is a promising technique for detecting and quantifying translationally active bacteria in the environment. This technique consists of incubating a bacterial sample with an analog of methionine and using click-chemistry to identify the cells that have incorporated the substrate. Here, we established an optimized protocol for the visualization of protein-synthesizing cells in oligotrophic waters that can be coupled with taxonomic identification using Catalyzed Reporter Deposition Fluorescent in Situ Hybridization...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29240290/bioorthogonal-cycloadditions-with-sub-millisecond-intermediates
#16
Yujia Qing, Gökçe Su Pulcu, Nicholas A W Bell, Hagan Bayley
Tetrazine- and sydnone-based click reactions have emerged as important bioconjugation strategies with fast kinetics and N2 or CO2 as the only byproduct. Mechanistic studies of these reactions have focused on the initial rate-determining cycloaddition steps. The subsequent N2 or CO2 release from the bicyclic intermediates has been approached mainly through computational studies, which have predicted lifetimes of femtoseconds. In the present study, bioorthogonal cycloadditions involving N2 or CO2 extrusion have been examined experimentally at the single-molecule level by using a protein nanoreactor...
January 26, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29192289/caspase-3-7-specific-metabolic-precursor-for-bioorthogonal-tracking-of-tumor-apoptosis
#17
Man Kyu Shim, Hong Yeol Yoon, Sangmin Lee, Mun Kyeong Jo, Jooho Park, Jong-Ho Kim, Seo Young Jeong, Ick Chan Kwon, Kwangmeyung Kim
Apoptosis is one of the most important intracellular events in living cell, which is a programmed cell death interrelated with caspase enzyme activity for maintaining homeostasis in multicellular organisms. Therefore, direct apoptosis imaging of living cells can provide enormous advantages for diagnosis, drug discovery, and therapeutic monitoring in various diseases. However, a method of direct apoptosis imaging has not been fully validated, especially for live cells in in vitro and in vivo. Herein, we developed a new apoptosis imaging technology via a direct visualization of active caspase-3/-7 activity in living cells...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29130210/imaging-newly-transcribed-rna-in-cells-by-using-a-clickable-azide-modified-utp-analog
#18
Anupam A Sawant, Sanjeev Galande, Seergazhi G Srivatsan
Robust RNA labeling and imaging methods that enable the understanding of cellular RNA biogenesis and function are highly desired. In this context, we describe a practical chemical labeling method based on a bioorthogonal reaction, namely, azide-alkyne cycloaddition reaction, which facilitates the fluorescence imaging of newly transcribed RNA in both fixed and live cells. This strategy involves the transfection of an azide-modified UTP analog (AMUTP) into mammalian cells, which gets specifically incorporated into RNA transcripts by RNA polymerases present inside the cells...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29109777/improved-tumor-targeting-and-longer-retention-time-of-nir-fluorescent-probes-using-bioorthogonal-chemistry
#19
Xianghan Zhang, Bo Wang, Na Zhao, Zuhong Tian, Yunpeng Dai, Yongzhan Nie, Jie Tian, Zhongliang Wang, Xiaoyuan Chen
The traditional labeling method for targeted NIR fluorescence probes requires directly covalent-bonded conjugation of targeting domains and fluorophores in vitro . Although this strategy works well, it is not sufficient for detecting or treating cancers in vivo , due to steric hindrance effects that relatively large fluorophore molecules exert on the configurations and physiological functions of specific targeting domains. The copper-free, "click-chemistry"-assisted assembly of small molecules in living systems may enhance tumor accumulation of fluorescence probes by improving the binding affinities of the targeting factors...
2017: Theranostics
https://www.readbyqxmd.com/read/29095606/ex-uno-plura-differential-labeling-of-phospholipid-biosynthetic-pathways-with-a-single-bioorthogonal-alcohol
#20
Timothy W Bumpus, Felice J Liang, Jeremy M Baskin
Imaging approaches that track biological molecules within cells are essential tools in modern biochemistry. Lipids are particularly challenging to visualize, as they are not directly genetically encoded. Phospholipids, the most abundant subgroup of lipids, are structurally diverse and accomplish many cellular functions, acting as major structural components of membranes and as signaling molecules that regulate cell growth, division, apoptosis, cytoskeletal dynamics, and numerous other physiological processes...
January 16, 2018: Biochemistry
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