- Macrometallocycle binuclear NHC silver(I) complex with bridging azobenzene: Synthesis, structure and recognition for hydrogen sulfate
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One bis-imidazolium salt 2,2′-di[2’’-(N-methyl-imidazoliumyl)ethoxyl]azobenzene hexafluorophosphate (LH2·(PF6)2) and its macrometallocycle binuclear N-heterocyclic carbene silver(I) complex [(LAg)2](PF6/su
- Liu, Qingxiang,Wu, Hao,Zhao, Zhixiang,Wei, Dengche
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Read Online
- Microsphere-based real-time calcium sensing
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Sensing within the cell: Microspheres (2 μm) covalently loaded with calcium sensors can be delivered efficiently into living cells to analyze the intracellular changes in the concentration of Ca2+ ions in real time. The figure shows the real-ti
- Sanchez-Martin, Rosario M.,Cuttle, Matt,Mittoo, Stifun,Bradley, Mark
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Read Online
- Synthesis of an azido-tagged low affinity ratiometric calcium sensor
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Changes in high localised concentrations of Ca2+ ions are fundamental to cell signalling. The synthesis of a dual excitation, ratiometric calcium ion sensor with a Kd of 90 μM, is described. It is tagged with an azido group for bioconjugation, and absorbs in the blue/green and emits in the red region of the visible spectrum with a large Stokes shift. The binding modulating nitro group is introduced to the BAPTA core prior to construction of a benzofuran-2-yl carboxaldehyde by an allylation-oxidation-cyclisation sequence, which is followed by condensation with an azido-tagged thiohydantoin. The thiohydantoin unit has to be protected with an acetoxymethyl (AM) caging group to allow CuAAC click reaction and incorporation of the KDEL peptide endoplasmic reticulum (ER) retention sequence.
- Caldwell, Stuart T.,Cairns, Andrew G.,Olson, Marnie,Chalmers, Susan,Sandison, Mairi,Mullen, William,McCarron, John G.,Hartley, Richard C.
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Read Online
- A Comprehensive Study of the Ca2+ Ion Binding of Fluorescently Labelled BAPTA Analogues
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Since its development, the ionophore BAPTA (1,2-bis(2-aminophenoxy)-ethane-N,N,N’,N’-tetraacetic acid) has been used unchanged in calcium sensing applications. In this work we present a comprehensive experimental and theoretical study of novel alterations in the structure of BAPTA, with a focus on the systematic modification of the chain connecting the two aromatic rings of the molecule (denoted as “linker”). A bis-(diethylamino)xantene fluorophore was also attached to the structures in a fixed position and the structure-fluorescence response relationship of these molecules was investigated in addition. The effect of the linker's length, the number of oxygen atoms in this chain and even the removal of one of the rings was tested; these all proved to significantly alter the characteristics of the compounds. For example, it was found that the second aromatic ring of BAPTA is not essential for the turn-on of the fluorescence. We also demonstrated that successful sensing can be realized even by replacing the chain with a single oxygen atom, which suggests the availability of a new calcium binding mode of the chelator. The reliable turn-on characteristic, the steep Ca2+ fluorescence titration curve and the intense fluorescence emission combine to make this compound a prospective candidate as a calcium sensing molecular probe in diagnostic neurobiological applications.
- Csomos, Attila,Kontra, Bence,Jancsó, Attila,Galbács, Gábor,Deme, Ruth,Kele, Zoltán,Rózsa, Balázs József,Kovács, Ervin,Mucsi, Zoltán
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supporting information
p. 5248 - 5261
(2021/10/19)
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- CONJUGATES AND CONJUGATES FOR USE IN PREVENTING OR TREATING OF BRAIN DAMAGE AND NEURODEGENERATIVE DISEASES
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The present invention relates to conjugates comprising one or more compounds selected from of (i) an anti-inflammatory compound, and/or (ii) an antioxidant compound, and/or (iii) and antibiotic compound and/or, (iv) a metal chelating compound and at least
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Page/Page column 43; 44
(2021/03/05)
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- Design potential selective inhibitors for human leukocyte common antigen-related (PTP-LAR) with fragment replace approach
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The overexpression of PTP-LAR could cause the insulin resistance, so PTP-LAR might be a promising target for treating diabetes. In this study, we applied the computer modeling methods with fragment replace approach to screen the fragment database by targeting PTP domain and site B with the aim to discover potent and selective PTP-LAR inhibitors. A series of novel 4-thiazolidone derivatives were gained. The results of their ADMET predictions indicated that these new compounds might become drug candidates. The series of these derivatives were synthesized. Subsequently, their PTP-LAR inhibitory activities were assayed. The compound7d showed highly selectivity for PTP-LAR (10.41 μM) over its close homolog PTP1B (IC50=44.40 μM), SHP2 (IC50>122.81 μM) and CDC25B (IC50>122.81 μM) and docking and molecular dynamics simulation were applied to propose the most likely binding mode of compound7d with PTP-LAR. Thus, our findings reported here may pave a way for discovering potential selective PTP-LAR inhibitors. AbbreviationsPTP-LAR Human leukocyte common antigen-relatedPTP Protein Tyrosine PhosphataseIR insulin receptorPTP1B Protein tyrosine phosphatase-1BLRP Lung resistance proteinADMET absorption, distribution, metabolism, excretion, toxicityPPB plasma protein bindingBBB blood brain barrier penetrationCYP450 cytochrome P450HIA human intestinal absorptionTLC thin-layer chromatographyUV Ultra VioletNMR nuclear magnetic resonanceTMS tetramethylsilaneMS mass spectrometryANM anisotropic network modePDB Protein Data BankDMF N,N-DimethylformamidepNPP para-nitrophenyl phosphateDTT dithiothreitolMD molecular dynamicRMSD root-mean-square deviationRMSF root-mean-square fluctuationSPC single-point chargePME Particle Mesh EwaldMM-PBSA molecular mechanics Poisson Boltzmann surface areaH bond, hydrogen bondVDW Van der Waals Communicated by Ramaswamy H. Sarma.
- Li, Hong-Lian,Li, Wei-Ya,Lu, Xin-Hua,Ma, Ying,Tang, Xue,Wang, Run-Ling,Wu, Jing-Wei,Zhang, Huan,Zheng, Zhi-Hui
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p. 5338 - 5348
(2019/12/24)
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- METHODS FOR PREPARING FUEL ADDITIVES
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A method is provided for preparing a fuel additive having the formula: ( l ) The method comprises carrying out the following reactions: (i) addition of an alkylating agent b to starting material a: (a) to form an intermediate c; and (ii) ring closing intermediate c to form fuel additive e.
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Page/Page column 34; 35
(2019/07/17)
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- Synthesis of new chalcone-based homoserine lactones and their antiproliferative activity evaluation
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Three series of new homoserine lactone analogs were efficiently synthesized starting from methionine and further evaluated for their antiproliferative activity against different cancer cell lines. Among these compounds, some of the chalcone containing compounds 6a-n showed acceptable antiproliferative activity against prostate cancer cells DU145 and PC-3 with the IC50 values less than 10 μM. Compounds 6c, 6e and 6h inhibited growth of DU145 and PC-3 cells at low micromolar levels with the IC50 values ranging from 3.0 to 5.0 μM, much more potent than natural OdDHL. Compound 6e concentration-dependently inhibited colony formation and cell migration of DU145 cells. A synergistic effect on the growth inhibition and the apoptosis of DU145 cells was observed when compound 6e was used in combination with TRAIL. OdDHL or 6e treatment concentration-dependently activated TRAIL death receptor DR5 which may account for the observed synergistic effect of 6e or OdDHL with TRAIL on the growth inhibition and cell apoptosis. Compound 6e also inhibited migration of DU145 cells in a time- and concentration-dependent manner. The data suggest that quorum sensing molecules OdDHL and 6e may improve the sensitivity of DU145 cells toward TRAIL via activating DR5, compound 6e may be used as a potential lead compound for developing new TRAIL receptor agonists.
- Yu, Bin,Liu, Haoyue,Kong, Xiaoyan,Chen, Xinli,Wu, Chunli
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p. 500 - 511
(2019/01/03)
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- Azobenzene linked cyclic N-heterocyclic carbene silver complex as well as preparation method and application thereof
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The invention discloses an azobenzene linked cyclic N-heterocyclic carbene silver complex as well as a preparation method and application thereof. The preparation method comprises the following steps:reacting o-nitrophenol and 1,2-dibromoethane in an orga
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Paragraph 0017
(2019/01/08)
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- Targeted probes of cellular physiology
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Biosensor comprising an activatable acceptor fluorogen linked via a linker to a donor which transfers energy to the fluorogen on detecting an analyte wherein the fluorogen component reacts and a 100 fold increase in intensity results when the fluorogen interacts non-covalently with an activator e.g. fluorogen activator peptide.
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Page/Page column 73
(2018/06/25)
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- Diphenoxyl flexible molecules with high affinity with A[beta] plaque and preparation method and applications thereof
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The invention discloses diphenoxyl flexible molecules with high affinity with A[beta] plaque and a preparation method and applications thereof. After the molecules are labeled by radionuclide, the molecules can be used as an A[beta] plaque developing agen
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Paragraph 0073; 0074; 0075; 0076
(2017/12/09)
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- An Efficient K2CO3-Promoted Synthesis of 1-Bromo-2-aryloxyethane Derivatives and Evaluation of Larval Mortality against Aedes aegypti
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The influences of reaction parameters on the etherification of phenols to obtain 1-bromo-2-aryloxyethane derivatives were evaluated. The compounds were prepared by direct etherification of phenols with 1,2-dibromoethane using anhydrous K2CO3 and acetonitrile as solvent reaction, at 80°C, in a reaction time of 6 h. Under these conditions, excellent yields (71%-94%) were obtained, with low yields of secondary products. The anhydrous K2CO3 was recycled by simple filtration, dried in vacuum, and reused. The compounds were characterized by conventional spectral data (MS and NMR). Larvicidal activity results showed a 100% larval mortality after 24-hour exposure to the compound 1-(2-bromoethoxy)-2-phenylbenzene.
- Pájaro, Yina,Sathicq, ángel,Puello-Polo, Esneyder,Pérez, Astrid,Romanelli, Gustavo,Trilleras, Jorge
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- Protein-specific localization of a rhodamine-based calcium-sensor in living cells
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A small synthetic calcium sensor that can be site-specifically coupled to proteins in living cells by utilizing the bio-orthogonal HaloTag labeling strategy is presented. We synthesized an iodo-derivatized BAPTA chelator with a tetramethyl rhodamine fluorophore that allows further modification by Sonogashira cross-coupling. The presented calcium sensitive dye shows a 200-fold increase in fluorescence upon calcium binding. The derivatization with an aliphatic linker bearing a terminal haloalkane-function by Sonogashira cross-coupling allows the localization of the calcium sensor to Halo fusion proteins which we successfully demonstrate in in vitro and in vivo experiments. The herein reported highly sensitive tetramethyl rhodamine based calcium indicator, which can be selectively localized to proteins, is a powerful tool to determine changes in calcium levels inside living cells with spatiotemporal resolution.
- Best, Marcel,Porth, Isabel,Hauke, Sebastian,Braun, Felix,Herten, Dirk-Peter,Wombacher, Richard
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supporting information
p. 5606 - 5611
(2016/07/06)
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- NON-SYSTEMIC TGR5 AGONISTS
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Compounds of structure (I), or a stereoisomer, tautomer, pharmaceutically acceptable salt or prodrug thereof, wherein R1, R2, R3, R4, R8, R9, R10, R11, R12, A1, A2, X, Y and Z are as defined herein. Uses of such compounds as TGR5 antagonists and for treatment of various indications, including Type II diabetes meletus are also provided.
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Page/Page column 173
(2013/07/05)
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- Two-photon excited fluorescent probes for calcium based on internal charge transfer
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Two-photon excited (TPE) calcium fluorescent probes are designed and synthesized based on internal charge transfer (ICT) with high Ca2+ affinity and large two-photon action cross section, which can be used in living cells and detected with two-
- Dong, Xiaohu,Yang, Yiyao,Sun, Jian,Liu, Zhihong,Liu, Bi-Feng
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supporting information; experimental part
p. 3883 - 3885
(2010/01/06)
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- A simple modification of the known preparation procedure of 2-Phenoxyethyl bromides providing high yields
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A modification of preparation method was developed for synthesis of a number of 1-bromo-2-phenoxyethanes from 1,2-dibromoethanes and sodium phenolates in two-phase water-organic system with or without addition of triethylbenzylammonium chloride as phase-transfer catalyst. Addition of NaOH in two portions for transforming phenols into phenolates ensured high yields (60-80%) of phenoxylation products.
- Slyn'ko,Tormyshev
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p. 254 - 257
(2007/10/03)
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- Preparation of new azobenzene crown ether p-tert-butylcalix[4]arenes and their roles as switchable ionophores for Na+ and K+ ions
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New azobenzene crown ether p-tert-butylcalix[4]arenes (6 and 7) have been synthesized by reductive coupling reactions between two nitrobenzene groups. Their isomerization and switchable binding properties towards Na+ and K+ were stud
- Pipoosananakaton, Bongkot,Sukwattanasinitt, Mongkol,Jaiboon, Nongnuj,Chaichit, Narongsak,Tuntulani, Thawatchai
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p. 9095 - 9100
(2007/10/03)
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- Synthesis and properties of liquid crystalline aniline monomers and semiconducting polyaniline with mesogenic side-chains
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Novel aniline monomers substituted by mesogenic moieties with different spacer lengths are synthesised and preliminary data are reported on the conjugated polymers produced.
- Gabaston, Laurence I.,Foot, Peter J. S.,Brown, John W.
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p. 429 - 430
(2007/10/03)
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