151
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Lee BL, Singh A, Mark Glover JN, Hendzel MJ, Spyracopoulos L. Molecular Basis for K63-Linked Ubiquitination Processes in Double-Strand DNA Break Repair: A Focus on Kinetics and Dynamics. J Mol Biol 2017; 429:3409-3429. [PMID: 28587922 DOI: 10.1016/j.jmb.2017.05.029] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/20/2017] [Accepted: 05/30/2017] [Indexed: 11/18/2022]
Abstract
Cells are exposed to thousands of DNA damage events on a daily basis. This damage must be repaired to preserve genetic information and prevent development of disease. The most deleterious damage is a double-strand break (DSB), which is detected and repaired by mechanisms known as non-homologous end-joining (NHEJ) and homologous recombination (HR), which are components of the DNA damage response system. NHEJ is an error-prone first line of defense, whereas HR invokes error-free repair and is the focus of this review. The functions of the protein components of HR-driven DNA repair are regulated by the coordinated action of post-translational modifications including lysine acetylation, phosphorylation, ubiquitination, and SUMOylation. The latter two mechanisms are fundamental for recognition of DSBs and reorganizing chromatin to facilitate repair. We focus on the structures and molecular mechanisms for the protein components underlying synthesis, recognition, and cleavage of K63-linked ubiquitin chains, which are abundant at damage sites and obligatory for DSB repair. The forward flux of the K63-linked ubiquitination cascade is driven by the combined activity of E1 enzyme, the heterodimeric E2 Mms2-Ubc13, and its cognate E3 ligases RNF8 and RNF168, which is balanced through the binding and cleavage of chains by the deubiquitinase BRCC36, and the proteasome, and through the binding of chains by recognition modules on repair proteins such as RAP80. We highlight a number of aspects regarding our current understanding for the role of kinetics and dynamics in determining the function of the enzymes and chain recognition modules that drive K63 ubiquitination.
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Affiliation(s)
- Brian L Lee
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Anamika Singh
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - J N Mark Glover
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Michael J Hendzel
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada; Department of Cell Biology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Leo Spyracopoulos
- Department of Biochemistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
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152
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Schnicker NJ, De Silva SM, Todd JD, Dey M. Structural and Biochemical Insights into Dimethylsulfoniopropionate Cleavage by Cofactor-Bound DddK from the Prolific Marine Bacterium Pelagibacter. Biochemistry 2017; 56:2873-2885. [DOI: 10.1021/acs.biochem.7b00099] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nicholas J. Schnicker
- Department
of Chemistry, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Saumya M. De Silva
- Department
of Chemistry, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Jonathan D. Todd
- School
of Biological Sciences, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, United Kingdom
| | - Mishtu Dey
- Department
of Chemistry, The University of Iowa, Iowa City, Iowa 52242, United States
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153
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Singh K, Sarbajna A, Dutta I, Pandey P, Bera JK. Hemilability-Driven Water Activation: A Ni II Catalyst for Base-Free Hydration of Nitriles to Amides. Chemistry 2017; 23:7761-7771. [PMID: 28388810 DOI: 10.1002/chem.201700816] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Indexed: 11/06/2022]
Abstract
The NiII complex 1 containing pyridyl- and hydroxy-functionalized N-heterocyclic carbenes (NHCs) is synthesized and its catalytic utility for the selective nitrile hydration to the corresponding amide under base-free conditions is evaluated. The title compound exploits a hemilabile pyridyl unit to interact with a catalytically relevant water molecule through hydrogen-bonding and promotes a nucleophilic water attack to the nitrile. A wide variety of nitriles is hydrated to the corresponding amides including the pharmaceutical drugs rufinamide, Rifater, and piracetam. Synthetically challenging α-hydroxyamides are accessed from cyanohydrins under neutral conditions. Related catalysts that lack the pyridyl unit (i.e., compounds 2 and 4) are not active whereas those containing both the pyridyl and the hydroxy or only the pyridyl pendant (i.e., compounds 1 and 3) show substantial activity. The linkage isomer 1' where the hydroxy group is bound to the metal instead of the pyridyl group was isolated under different crystallization conditions insinuating a ligand hemilabile behavior. Additional pKa measurements reveal an accessible pyridyl unit under the catalytic conditions. Kinetic studies support a ligand-promoted nucleophilic water addition to a metal-bound nitrile group. This work reports a Ni-based catalyst that exhibits functional hemilability for hydration chemistry.
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Affiliation(s)
- Kuldeep Singh
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Abir Sarbajna
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Indranil Dutta
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Pragati Pandey
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Jitendra K Bera
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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154
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Lee S, Lee H, Jung OS. A sandwich-shaped M 3L 2 zinc(ii) complex containing 1,3,5-tris(dimethyl(pyridin-3-yl)silyl)benzene: selective photoluminescence recognition of diiodomethane. Dalton Trans 2017; 46:5843-5847. [PMID: 28426062 DOI: 10.1039/c7dt01138e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembly of Zn(ClO4)2 with 1,3,5-tris(dimethyl(pyridin-3-yl)silyl)benzene (L) as a new C3-symmetric tridentate N-donor gives rise to a discrete sandwich-shaped M3L2 architecture, [Zn3(μ-OH)3L2](ClO4)3·4CH3CN·2H2O. Its blue photoluminescence is significantly quenched only by CH2I2 among the various small molecules, CH2Cl2, CH2Br2, CHCl3, 1,2-dichloroethane, EtOH, CH3CN, benzene, toluene, and phenol.
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Affiliation(s)
- Sangseok Lee
- Department of Chemistry, Pusan National University, Busan 46241, Korea.
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155
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Li PF, Liu YY, Zhang WJ, Zhao N. A Fluorescent Probe for Pyrophosphate Based on Tetraphenylethylene Derivative with Aggregation-Induced Emission Characteristics. ChemistrySelect 2017. [DOI: 10.1002/slct.201700302] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Peng Fei Li
- Key Laboratory of Macromolecular Science of Shaanxi Province; Shaanxi Normal University; 620 West Chang'an Avenue Xi'an 710119 China
| | - Yan Yan Liu
- Key Laboratory of Macromolecular Science of Shaanxi Province; Shaanxi Normal University; 620 West Chang'an Avenue Xi'an 710119 China
| | - Wen Juan Zhang
- Key Laboratory of Macromolecular Science of Shaanxi Province; Shaanxi Normal University; 620 West Chang'an Avenue Xi'an 710119 China
| | - Na Zhao
- Key Laboratory of Macromolecular Science of Shaanxi Province; Shaanxi Normal University; 620 West Chang'an Avenue Xi'an 710119 China
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156
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Synthesis, characterization and crystal structure determination of a new Zn(II) Schiff base complex derived from condensation of a new asymmetrical tripodal amine, 3-((4-aminobutyl)(pyridin-2-ylmethyl)amino)propan-1-ol and 2-hydroxy-3-methoxybenzaldehyde. JOURNAL OF SAUDI CHEMICAL SOCIETY 2017. [DOI: 10.1016/j.jscs.2015.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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157
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Bioinspired Co(II) and Zn(II) complexes with an imidazole derived tripodal ligand. Structural models for astacins and MnSOD. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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158
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Li WW, Mu HL, Liu JY, Li YS. 9,9-Dimethylxanthene-based binuclear phenoxy-imine neutral nickel(II) catalysts for ethylene homo- and copolymerization. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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159
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Zhang T, Sharma G, Paul TJ, Hoffmann Z, Prabhakar R. Effects of Ligand Environment in Zr(IV) Assisted Peptide Hydrolysis. J Chem Inf Model 2017; 57:1079-1088. [PMID: 28398040 DOI: 10.1021/acs.jcim.6b00781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this DFT study, activities of 11 different N2O4, N2O3, and NO2 core containing Zr(IV) complexes, 4,13-diaza-18-crown-6 (I'N2O4), 1,4,10-trioxa-7,13-diazacyclopentadecane (I'N2O3), and 2-(2-methoxy)ethanol (I'NO2), respectively, and their analogues in peptide hydrolysis have been investigated. Based on the experimental information, these molecules were created by altering protonation states (singly protonated, doubly protonated, or doubly deprotonated) and number of their ligands. The energetics of the I'N2O4, and I'NO2 and their analogues predicted that both stepwise and concerted mechanisms occurred either with similar barriers, or the latter was more favorable than the former. They also showed that the doubly deprotonated form hydrolyzed the peptide bond with substantially lower barriers than the barriers for other protonation states. For NO2 core possessing complexes, Zr-(NO2)(OHH)(H2O/OH)n for n = 1-3, the hydroxyl group containing molecules were found to be more reactive than their water ligand possessing counterparts. The barriers for these complexes reduced with an increase in the coordination number (6-8) of the Zr(IV) ion. Among all 11 molecules, the NO2 core possessing and two hydroxyl group containing I'DNO2-2H complex was found to be the most reactive complex with a barrier of 28.9 kcal/mol. Furthermore, barriers of 27.5, 28.9, and 32.0 kcal/mol for hydrolysis of Gly-Glu (negative), Gly-Gly (neutral), and Gly-Lys (positive) substrates, respectively, by this complex were in agreement with experiments. The activities of these complexes were explained in terms of basicity of their ligand environment and nucleophilicity of the Zr(IV) center using metal-ligand distances, charge on the metal ion, and the metal-nucleophile distance as parameters. These results provide a deeper understanding of the functioning of these complexes and will help design Zr(IV)-based synthetic metallopeptidases.
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Affiliation(s)
- Tingting Zhang
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Gaurav Sharma
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Thomas J Paul
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Zachary Hoffmann
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Rajeev Prabhakar
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
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160
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Kreider-Mueller A, Quinlivan PJ, Owen JS, Parkin G. Tris(2-mercaptoimidazolyl)hydroborato Cadmium Thiolate Complexes, [Tm But]CdSAr: Thiolate Exchange at Cadmium in a Sulfur-Rich Coordination Environment. Inorg Chem 2017; 56:4644-4654. [PMID: 28368611 PMCID: PMC5461919 DOI: 10.1021/acs.inorgchem.7b00296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Indexed: 11/30/2022]
Abstract
A series of cadmium thiolate compounds that feature a sulfur-rich coordination environment, namely [TmBut]CdSAr, have been synthesized by the reactions of [TmBut]CdMe with ArSH (Ar = C6H4-4-F, C6H4-4-But, C6H4-4-OMe, and C6H4-3-OMe). In addition, the pyridine-2-thiolate and pyridine-2-selenolate derivatives, [TmBut]CdSPy and [TmBut]CdSePy have been obtained via the respective reactions of [TmBut]CdMe with pyridine-2-thione and pyridine-2-selone. The molecular structures of [TmBut]CdSAr and [TmBut]CdEPy (E = S or Se) have been determined by X-ray diffraction and demonstrate that, in each case, the [CdS4] motif is distorted tetrahedral and approaches a trigonal monopyramidal geometry in which the thiolate ligand adopts an equatorial position; [TmBut]CdSPy and [TmBut]CdSePy, however, exhibit an additional long-range interaction with the pyridyl nitrogen atoms. The ability of the thiolate ligands to participate in exchange was probed by 1H and 19F nuclear magnetic resonance (NMR) spectroscopic studies of the reactions of [TmBut]CdSC6H4-4-F with ArSH (Ar = C6H4-4-But or C6H4-4-OMe), which demonstrate that (i) exchange is facile and (ii) coordination of thiolate to cadmium is most favored for the p-fluorophenyl derivative. Furthermore, a two-dimensional EXSY experiment involving [TmBut]CdSC6H4-4-F and 4-fluorothiophenol demonstrates that degenerate thiolate ligand exchange is also facile on the NMR time scale.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jonathan S. Owen
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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161
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Choi E, Ryu M, Lee H, Jung OS. Enantiomeric two-fold interpenetrated 3D zinc(ii) coordination networks as a catalytic platform: significant difference between water within the cage and trace water in transesterification. Dalton Trans 2017; 46:4595-4601. [PMID: 28321444 DOI: 10.1039/c7dt00217c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembly of Zn(ClO4)2 with 1,1,2,2-tetramethyl-1,2-di(pyridin-3-yl)disilane (L) as a bidentate N-donor gives rise to 3D coordination networks, [Zn(μ-OH)(L)]3(ClO4)3·5H2O (1·5H2O), of unique, 103-a srs net topology. An important feature is that two enantiomeric 3D frameworks, 41- and 43-[Zn(μ-OH)(L)]3(ClO4)3·5H2O, are interpenetrated to form a racemic two-fold 3D network with cages occupied by two water molecules. Another structural characteristic is a C3-symmetric planar Zn3(μ-OH)3 6-membered ring with tetrahedral Zn(ii) ions. The steric hindrance of substrates and trace water effects on transesterification catalysis using the network have been scrutinized. The coordination network acts as a remarkable heterogeneous transesterification catalytic system that shows both the significant steric effects of substrate alcohols and momentous water effects. The substrate activity is in the order ethanol > n-propanol > n-butanol > iso-propanol > 2-butanol > tert-butanol. For the reaction system, solvate water molecules within the cages of the interpenetrated 3D frameworks do not decrease the transesterification activity, whereas the trace water molecules in the substrate alcohols act as obvious obstacles to the reaction.
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Affiliation(s)
- Eunkyung Choi
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Minjoo Ryu
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Haeri Lee
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
| | - Ok-Sang Jung
- Department of Chemistry, Pusan National University, Pusan 46241, Korea.
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162
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Lau N, Sano Y, Ziller JW, Borovik AS. Terminal Ni II-OH/-OH 2 complexes in trigonal bipyramidal geometries derived from H 2O. Polyhedron 2017; 125:179-185. [PMID: 29170577 PMCID: PMC5695699 DOI: 10.1016/j.poly.2016.11.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The preparation and characterization of two NiII complexes are described, a terminal NiII-OH complex with the tripodal ligand tris[(N)-tertbutylureaylato)-N-ethyl)]aminato ([H3buea]3-) and a terminal Ni II-OH2 complex with the tripodal ligand N,N',N″-[2,2',2″-nitrilotris(ethane-2,1-diyl)]tris(2,4,6-trimethylbenzenesulfonamido) ([MST]3-). For both complexes, the source of the -OH and -OH2 ligand is water. The salts K2[NiIIH3buea(OH)] and NMe4[NiIIMST(OH2)] were characterized using perpendicular-mode X-band electronic paramagnetic resonance, Fourier transform infrared, UV-visible spectroscopies, and its electrochemical properties were evaluated using cyclic voltammetry. The solid state structures of these complexes determined by X-ray diffraction methods reveal that they adopt a distorted trigonal bipyramidal geometry, an unusual structure for 5-coordinate NiII complexes. Moreover, the NiII-OH and NiII-OH2 units form intramolecular hydrogen bonding networks with the [H3buea]3- and [MST]3- ligands. The oxidation chemistry of these complexes was explored by treating the high-spin NiII compounds with one-electron oxidants. Species were formed with S = 1/2 spin ground states that are consistent with formation of monomeric NiIII species. While the formation of NiIII-OH complexes cannot be ruled out, the lack of observable O-H vibrations from the putative Ni-OH units suggest the possibility that other high valent Ni species are formed.
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Affiliation(s)
- Nathanael Lau
- Department of Chemistry, University of California - Irvine, 1102 Natural Sciences II, Irvine, CA 92697-2025, United States
| | - Yohei Sano
- Department of Chemistry, University of California - Irvine, 1102 Natural Sciences II, Irvine, CA 92697-2025, United States
| | - Joseph W Ziller
- Department of Chemistry, University of California - Irvine, 1102 Natural Sciences II, Irvine, CA 92697-2025, United States
| | - A S Borovik
- Department of Chemistry, University of California - Irvine, 1102 Natural Sciences II, Irvine, CA 92697-2025, United States
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163
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Barman SK, Mondal T, Koley D, Lloret F, Mukherjee R. A phenoxo-bridged dicopper(ii) complex as a model for phosphatase activity: mechanistic insights from a combined experimental and computational study. Dalton Trans 2017; 46:4038-4054. [PMID: 28271106 DOI: 10.1039/c6dt03514k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A μ-phenoxo-bis(μ2-1,3-acetato)-bridged dicopper(ii) complex [Cu(L1)(μ-O2CMe)2][NO3] (1) has been synthesized from the perspective of modeling phosphodiesterase activity. Structural characterization was done initially with 1·3Et2O (vapour diffusion of Et2O into MeOH solution of 1; poor crystal quality) and finally with its perchlorate salt [Cu(L1)(μ-O2CMe)2][ClO4]·1.375MeCN·0.25H2O, crystallized from vapour diffusion of n-pentane into a MeCN-MeOH mixture (comparatively better crystal quality). An asymmetric unit of such a crystal contains two independent molecules of compositions [Cu(L1)(μ-O2CMe)2][ClO4] and [Cu(L1)(μ-O2CMe)2(MeCN)][ClO4] (coordinated MeCN with 0.75 occupancy), and two molecules of MeCN and H2O (each H2O molecule with 0.25 occupancy) as the solvent of crystallization. These two cations, each having five-coordinate (μ-phenoxo)bis(μ-acetato)-bridged CuII ions, differ by only the coordination environment of only one CuII ion, which has a weakly coordinated acetonitrile molecule in its sixth position. Temperature-dependent magnetic studies on 1 reveal that the copper(ii) centres are antiferromagnetically coupled with the exchange-coupling constant J = -124(1) cm-1. Theoretically calculated J = -126.51 cm-1, employing a broken-symmetry DFT approach, is in excellent agreement with the experimental value. The dicopper(ii) complex has been found to be catalytically efficient in the hydrolysis of 2-hydroxypropyl-p-nitrophenylphosphate (HPNP). Detailed kinetic experiments and solution studies (potentiometry, species distribution and ESI-MS) were performed to elucidate the reaction mechanism. DFT calculations were performed to discriminate between different possible mechanistic pathways. The free-energy barrier for HPNP hydrolysis catalyzed by 1 is comparable to that obtained from the experimentally-determined value. The involvement of non-covalent (hydrogen-bonding) interaction has also been probed by DFT calculations. The activity of 1 is found to be the highest, compared to the structurally-characterized Mn, Co, Ni and Zn complexes of L1(-) reported earlier, under identical experimental conditions, in which each metal centre is six-coordinate.
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Affiliation(s)
- Suman K Barman
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India. and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - Totan Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - Debasis Koley
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - Francesc Lloret
- Departament de Química Inorgànica/Fundació General de la Universitat de València (FGUV)/Instituto de Ciencia, Molecular (ICMOL), Universitat de València, Polígono de la Coma, s/n, 46980-Paterna, València, Spain
| | - Rabindranath Mukherjee
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India. and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
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164
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Dey S, Sarkar T, Majumdar A, Pathak T, Ghosh K. 1,4-Disubstituted 1,2,3-Triazole- and 1,5-Disubstituted 1,2,3-Triazole-based Bis-Sulfonamides in Selective Fluorescence Sensing of ATP. ChemistrySelect 2017. [DOI: 10.1002/slct.201601933] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Santu Dey
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 India
| | - Tanmay Sarkar
- Department of Chemistry; University of Kalyani; Kalyani-741235 India
| | - Anupam Majumdar
- Department of Chemistry; University of Kalyani; Kalyani-741235 India
| | - Tanmaya Pathak
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 India
| | - Kumaresh Ghosh
- Department of Chemistry; University of Kalyani; Kalyani-741235 India
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165
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Abstract
Metal ions play significant roles in numerous fields including chemistry, geochemistry, biochemistry, and materials science. With computational tools increasingly becoming important in chemical research, methods have emerged to effectively face the challenge of modeling metal ions in the gas, aqueous, and solid phases. Herein, we review both quantum and classical modeling strategies for metal ion-containing systems that have been developed over the past few decades. This Review focuses on classical metal ion modeling based on unpolarized models (including the nonbonded, bonded, cationic dummy atom, and combined models), polarizable models (e.g., the fluctuating charge, Drude oscillator, and the induced dipole models), the angular overlap model, and valence bond-based models. Quantum mechanical studies of metal ion-containing systems at the semiempirical, ab initio, and density functional levels of theory are reviewed as well with a particular focus on how these methods inform classical modeling efforts. Finally, conclusions and future prospects and directions are offered that will further enhance the classical modeling of metal ion-containing systems.
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Affiliation(s)
| | - Kenneth M. Merz
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute of Cyber-Enabled Research, Michigan State University, East Lansing, Michigan 48824, United States
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166
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Direct immobilization of antibodies on Zn-doped Fe 3 O 4 nanoclusters for detection of pathogenic bacteria. Anal Chim Acta 2017; 952:81-87. [DOI: 10.1016/j.aca.2016.11.041] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/17/2016] [Accepted: 11/18/2016] [Indexed: 12/11/2022]
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167
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Jadhav AA, Dhanwe VP, Khanna PK. Synthesis of novel Zn(II) and Cd(II) complexes of semicarbazones and their utility as precursors for respective metal selenide quantum dots. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.10.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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168
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Yadav MK, Maurya AK, Rajput G, Manar KK, Vinayak M, Drew MGB, Singh N. New planar trans-copper(II) β-dithioester chelate complexes: synthesis, characterization, anticancer activity and DNA-binding/cleavage studies. J COORD CHEM 2017. [DOI: 10.1080/00958972.2016.1275589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Manoj Kumar Yadav
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Akhilendra Kumar Maurya
- Biochemistry & Molecular Biology Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Gunjan Rajput
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Krishna Kumar Manar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Manjula Vinayak
- Biochemistry & Molecular Biology Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, India
| | | | - Nanhai Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, India
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169
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Pramanik S, Bhalla V, Kumar M. Hexaphenylbenzene-based fluorescent aggregates for detection of zinc and pyrophosphate ions in aqueous media: tunable self-assembly behaviour and construction of a logic device. NEW J CHEM 2017. [DOI: 10.1039/c6nj03953g] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aggregates of HPB derivative 7 exhibited “on–on” response towards Zn2+ ions and this in situ prepared 7-Zn2+ ensemble was utilized as a “not quenched” probe for detection of PPi ions in aqueous media.
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Affiliation(s)
- Subhamay Pramanik
- Department of Chemistry
- UGC Sponsored Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar 143005
- India
| | - Vandana Bhalla
- Department of Chemistry
- UGC Sponsored Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar 143005
- India
| | - Manoj Kumar
- Department of Chemistry
- UGC Sponsored Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar 143005
- India
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170
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Niobium(V) peroxo α-amino acid complexes: Synthesis, stability and kinetics of inhibition of acid phosphatase activity. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.09.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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171
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Miller GBS, Uggerud E. Dissociation of Mg(ii) and Zn(ii) complexes of simple 2-oxocarboxylates – relationship to CO2fixation, and the Grignard and Barbier reactions. Org Biomol Chem 2017; 15:6813-6825. [DOI: 10.1039/c7ob01327b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The glyoxylate and pyruvate carboxylates have been complexed to Mg(ii) and Zn(ii) to investigate the intrinsic interactions of these important biochemical species in the gas phase.
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Affiliation(s)
- Glenn B. S. Miller
- Mass Spectrometry Laboratory and Centre of Theoretical and Computational Chemistry
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Einar Uggerud
- Mass Spectrometry Laboratory and Centre of Theoretical and Computational Chemistry
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
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172
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Lee JJ, Choi D, Lee H, Jung OS. Coordination-cyclodimeric array containing both channels and cages: photoluminescence recognition of diiodomethane. CrystEngComm 2017. [DOI: 10.1039/c7ce00616k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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173
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Akhtar M, Alharthi AI, Alotaibi MA, Trendafilova N, Georgieva I, Nawaz Tahir M, Mazhar M, Isab AA, Hanif M, Ahmad S. Synthesis, X-ray structure, spectroscopic (IR, NMR) analysis and DFT modeling of a new polymeric Zinc(II) complex of cystamine, [Zn(Cym-Cym)Cl2]. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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174
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Motahari A, Fattahi A. Theoretical aspects of the enhancement of metal binding affinity by intramolecular hydrogen bonding and modulating pKavalues. NEW J CHEM 2017. [DOI: 10.1039/c7nj02693e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stability balance shows that the hydrogen bond network and modulation of pKavalues can enhance the metal binding affinity.
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Affiliation(s)
- Ahmad Motahari
- Faculty of Chemistry
- Sharif University of Technology
- P. O. Box 11365-9516
- Tehran
- Iran
| | - Alireza Fattahi
- Faculty of Chemistry
- Sharif University of Technology
- P. O. Box 11365-9516
- Tehran
- Iran
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175
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Culp E, Wright GD. Bacterial proteases, untapped antimicrobial drug targets. J Antibiot (Tokyo) 2016; 70:366-377. [PMID: 27899793 DOI: 10.1038/ja.2016.138] [Citation(s) in RCA: 141] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 09/29/2016] [Accepted: 10/06/2016] [Indexed: 01/05/2023]
Abstract
Bacterial proteases are an extensive collection of enzymes that have vital roles in cell viability, stress response and pathogenicity. Although their perturbation clearly offers the potential for antimicrobial drug development, both as traditional antibiotics and anti-virulence drugs, they are not yet the target of any clinically used therapeutics. Here we describe the potential for and recent progress in the development of compounds targeting bacterial proteases with a focus on AAA+ family proteolytic complexes and signal peptidases (SPs). Caseinolytic protease (ClpP) belongs to the AAA+ family of proteases, a group of multimeric barrel-shaped complexes whose activity is tightly regulated by associated AAA+ ATPases. The opportunity for chemical perturbation of these complexes is demonstrated by compounds targeting ClpP for inhibition, activation or perturbation of its associated ATPase. Meanwhile, SPs are also a proven antibiotic target. Responsible for the cleavage of targeting peptides during protein secretion, both type I and type II SPs have been successfully targeted by chemical inhibitors. As the threat of pan-antibiotic resistance continues to grow, these and other bacterial proteases offer an arsenal of novel antibiotic targets ripe for development.
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Affiliation(s)
- Elizabeth Culp
- Michael G. DeGroote Institute for Infectious Disease Research and the Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Gerard D Wright
- Michael G. DeGroote Institute for Infectious Disease Research and the Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
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176
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Chen C, Zhao D, Sun J, Yang X. Colorimetric Logic Gate for Pyrophosphate and Pyrophosphatase via Regulating the Catalytic Capability of Horseradish Peroxidase. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29529-29535. [PMID: 27714993 DOI: 10.1021/acsami.6b10712] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
By regulating the catalytic capability of horseradish peroxidase (HRP), an artful colorimetric assay platform for pyrophosphate (PPi) and pyrophosphatase (PPase) was unprecedentedly designed. In this work, Cu(I), generated by reducing Cu(II) in the presence of ascorbate, could inhibit HRP's catalytic capability of transforming colorless 3,3',5,5'-tetramethylbenzidine (TMB) into blue oxidized TMB (oxTMB). The robust coordination between PPi and Cu(II) is able to discourage the reduction of Cu(II) to Cu(I) effectively, thus restoring the original catalytic capability of HRP and regenerating blue-colored oxTMB. Upon PPase introduction, PPi would be hydrolyzed into orthophosphate, which could release Cu(II) free from the Cu(II)-PPi complex, and thus in turn allows the catalytic capability of HRP to be inhibited by Cu(I). HRP was activated or deactivated to different degrees depending on PPi or PPase levels, which could be indicated by using HRP-triggered catalytic system as a signal amplifier, thus paving a way for PPi and PPase sensing. Based on the colorimetric sensor for PPi and PPase, an "INH" logic gate was rationally constructed. With the merits of high sensitivity and selectivity, cost-effectiveness, and simplification, our proposed analytical system has also been verified to have potential to be utilized for enzyme inhibitor screening and diagnosis of PPase-related diseases.
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Affiliation(s)
- Chuanxia Chen
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Dan Zhao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Jian Sun
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
| | - Xiurong Yang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
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177
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Yang J, Acharya R, Zhu X, Köse M, Schanze KS. Pyrophosphate Sensor Based on Principal Component Analysis of Conjugated Polyelectrolyte Fluorescence. ACS OMEGA 2016; 1:648-655. [PMID: 31457154 PMCID: PMC6640761 DOI: 10.1021/acsomega.6b00189] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/03/2016] [Indexed: 05/05/2023]
Abstract
The pyrophosphate anion (PPi) plays an important role in biochemical processes. Therefore, a simple but reliable analytical technique is essential for selective detection of PPi in biochemical systems. Here, we present a principal component analysis (PCA) method for analytical determination of PPi concentration using a fluorescent conjugated polyelectrolyte (CPE) combined with a polyamine modifier. The CPE has anionic side chains and dissolves molecularly in water, as indicated by its structured fluorescence emission spectrum. However, addition of tris(3-aminoethyl)amine (tetraamine or N4) quenches the CPE fluorescence emission. Tetraamine, which is a polycation at neutral pH, binds multiple anionic CPE chains, leading to aggregate formation, resulting in aggregation-induced fluorescence quenching. Addition of PPi to the polymer-amine aggregate reverses the process, resulting in fluorescence recovery. The relatively higher concentration of PPi compared to that of the polymer allows it to effectively compete to bind the amine, thus releasing molecularly dissolved polymer chains. Fluorescence correlation spectroscopy of the P1/N4 complex and of P1/N4/PPi confirms the change in size of the CPE aggregates that occurs upon reversible aggregation. Application of PCA to the fluorescence emission data set of standard samples yields two principal components, which are used to create a predictive model for PPi analysis. The PCA method is able to directly determine the concentration of PPi with approximately 95% accuracy within the concentration range from 100 μM to 3 mM, without the need for a reference state as is typically needed for ratiometric fluorescence assays.
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Affiliation(s)
- Jie Yang
- Department
of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States
| | - Rajendra Acharya
- Department
of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States
| | - Xuzhi Zhu
- Department
of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States
| | - Muhammet
E. Köse
- Institute
of Nanotechnology, Gebze Technical University, Gebze, Kocaeli 41400, Turkey
| | - Kirk S. Schanze
- Department
of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, United States
- The
Education Ministry Key Laboratory and Joint International Laboratory
of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional
Materials, Shanghai Normal University, Shanghai 200234, China
- E-mail:
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178
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Areti S, Bandaru S, Rao CP. Triazole-Linked Quinoline Conjugate of Glucopyranose: Selectivity Comparison among Zn 2+, Cd 2+, and Hg 2+ Based on Spectroscopy, Thermodynamics, and Microscopy, and Reversible Sensing of Zn 2+ and the Structure of the Complex Using DFT. ACS OMEGA 2016; 1:626-635. [PMID: 31457152 PMCID: PMC6640762 DOI: 10.1021/acsomega.6b00277] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 10/07/2016] [Indexed: 05/05/2023]
Abstract
A water-soluble triazole-linked quinoline conjugate of glucopyranose (L) has been synthesized and characterized, and its single-crystal X-ray diffraction (XRD) structure has been established. Binding of L toward different biologically relevant metal ions has been studied using fluorescence and absorption spectroscopy in HEPES buffer at pH 7.4. The conjugate L detects Zn2+ and Cd2+ with 30 ± 2 and 14 ± 1-fold fluorescence enhancement, respectively, but in the case of Hg2+, only a fluorescence quench was observed. The stoichiometry of the complex is 1:2 metal ion to the ligand in the case of Zn2+ and Cd2+ resulting in [Zn(L)2] and [Cd(L)2], and it is 1:1 in the case of Hg2+, as confirmed from their electrospray ionization mass spectrometry (ESIMS) spectra. Zn2+ shows greater exothermicity over Cd2+, whereas Hg2+ shows endothermicity , which supports the differences in their binding strength and the nature of the corresponding complex. L exhibits rod-shaped particles and upon complexation with Zn2+, it exhibits sphere-like morphological features in scanning electron microscopy (SEM) images. However, clustered aggregates are observed in Cd2+, whereas the [HgL] complex exhibits small fused spherical structures, and therefore the signature of these ions is seen in microscopy images. The computational studies revealed that the syn-[Zn(L)2] complex is stabilized by 9.7 kcal mol-1 more than that in the case of anti-[Zn(L)2] owing to the formation of hydrogen bonds between the two glucosyl moieties within the syn-complex. Among the anions studied, [Zn(L)2] is sensitive and selective toward the phosphate ion (H2PO4 -) with a minimum detection limit of 16 ± 2 ppb. Similarly, the [HgL] can act as a secondary sensor for CN- while also exhibiting reversibility. Based on the input-output characteristics, INHIBIT logic gate was built in the case of Zn2+ vs H2PO4 - and IMPLICATION logic gate was built in the case of Hg2+ vs CN-.
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Affiliation(s)
- Sivaiah Areti
- Bioinorganic
Laboratory, Department of Chemistry, Indian
Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Sateesh Bandaru
- Bioinorganic
Laboratory, Department of Chemistry, Indian
Institute of Technology Bombay, Powai, Mumbai 400 076, India
- Beijing
Computational Science Research Center, Zhongguancun, Software Park II, Beijing 100084, China
| | - Chebrolu Pulla Rao
- Bioinorganic
Laboratory, Department of Chemistry, Indian
Institute of Technology Bombay, Powai, Mumbai 400 076, India
- E-mail: . Phone: 91 22 2576 7162. Fax: 91 22 2572 3480 (C.P.R.)
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179
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Zhou YH, Chen LQ, Tao J, Shen JL, Gong DY, Yun RR, Cheng Y. Effective cleavage of phosphodiester promoted by the zinc(II) and copper(II) inclusion complexes of β-cyclodextrin. J Inorg Biochem 2016; 163:176-184. [DOI: 10.1016/j.jinorgbio.2016.07.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 07/06/2016] [Accepted: 07/13/2016] [Indexed: 12/23/2022]
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180
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Acceptorless Alcohol Dehydrogenation: A Mechanistic Perspective. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2016. [DOI: 10.1007/s40010-016-0296-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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181
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Bogdanović X, Palm GJ, Schwenteit J, Singh RK, Gudmundsdóttir BK, Hinrichs W. Structural evidence of intramolecular propeptide inhibition of the aspzincin metalloendopeptidase AsaP1. FEBS Lett 2016; 590:3280-94. [DOI: 10.1002/1873-3468.12356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 08/03/2016] [Accepted: 08/05/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Xenia Bogdanović
- Department of Molecular Structural Biology; Institute for Biochemistry; University of Greifswald; Germany
- Institute for Biochemistry and Molecular Biology; ZBMZ; Medical Faculty; University of Freiburg; Freiburg im Breisgau Germany
| | - Gottfried J. Palm
- Department of Molecular Structural Biology; Institute for Biochemistry; University of Greifswald; Germany
| | - Johanna Schwenteit
- Department of Molecular Structural Biology; Institute for Biochemistry; University of Greifswald; Germany
- Institute for Experimental Pathology; University of Iceland, Keldur; Reykjavík Iceland
| | - Rajesh K. Singh
- Department of Molecular Structural Biology; Institute for Biochemistry; University of Greifswald; Germany
| | | | - Winfried Hinrichs
- Department of Molecular Structural Biology; Institute for Biochemistry; University of Greifswald; Germany
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182
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Jazestani M, Chiniforoshan H, Tabrizi L, McArdle P. Synthesis and crystal structures of cobalt(II), cadmium(II), and zinc(II) complexes of 4-nitro phenylcyanamide: enhancing the biological properties through bound to human serum albumin. J Biomol Struct Dyn 2016; 35:2055-2065. [PMID: 27476997 DOI: 10.1080/07391102.2016.1201006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Metal complexes of the type [Co(phen)2(4-NO2pcyd)2].CH3OH, 1, [Zn(phen)2(4-NO2pcyd)2].CH3OH, 2, [Cd(phen)2(4-NO2pcyd)2], and 3, (phen = 1,10-phenanthroline, 4-NO2pcyd = 4-nitro phenylcyanamide) have been studied. The synthesis, characterization, and the biological activities of complexes 1-3 have been investigated. The geometries of complexes 1-3 were confirmed by single-crystal X-ray crystallography. The interactions of complexes 1-3 with human serum albumin (HSA) were studied using fluorescence and circular dichroism spectroscopy. The thermodynamic studies have showed the reaction for the binding of complexes 1-3 with HSA is hydrophobic (ΔH0 ˂ 0 and ΔS0 > 0). The in vitro cytotoxic potential of complexes 1-3 and their complexes with HSA were examined. The complexes 1-3 with HSA enhance about 3-fold cytotoxicity in cancer cells lines.
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Affiliation(s)
- Mehdi Jazestani
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156-83111 , Iran
| | - Hossein Chiniforoshan
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156-83111 , Iran
| | - Leila Tabrizi
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156-83111 , Iran
| | - Patrick McArdle
- b School of Chemistry , National University of Ireland Galway , University Road, Galway , Ireland
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183
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Li CT, Cao QY, Li JJ, Wang ZW, Dai BN. Ferrocene-containing macrocyclic triazoles for the electrochemical sensing of dihydrogen phosphate anion. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.04.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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184
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Abebayehu A, Dutta R, Lee CH. Synthesis, Characterization and Properties of Expanded Pyriporphyrins: A New Family of Alkylidenyl Porphyrin Homologues Bearing meso
-Exocyclic Double Bonds. Chemistry 2016; 22:13850-13856. [DOI: 10.1002/chem.201602136] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Abeje Abebayehu
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
| | - Ranjan Dutta
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
| | - Chang-Hee Lee
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
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185
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Gao EJ, Zhang S, Meng Y, Zhao FC, Ma XY, Jin HT, Liu SJ, Ge J, Sun YG, Zhang WZ, Zhu MC. The Syntheses, Structures, Fluorescence Properties and Biological Activity of two Novel Zinc(II) Complexes Controlled by the Tripodal Imidazole Ligand. J Fluoresc 2016; 26:1331-9. [PMID: 27210797 DOI: 10.1007/s10895-016-1820-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 05/09/2016] [Indexed: 10/21/2022]
Abstract
Two new zinc complexes, namely Zn(L(1))ClCH2NO(1) and {Zn(L(2))CH2NO}n▪N(CH3)3▪ClO4(2) (L(1) = 3,5-di(1H-imidazol-1-yl)pyridine L(2) = 1,3,5-tris(1-imidazolyl) benzene), have been synthesized, and characterized by IR spectra, elemental analysis, and a single crystal X-ray diffraction. Fluorescence spectroscopy indicated that two complexes presented strong DNA binding affinity constants to fish sperm DNA (FS-DNA). Gel electrophoresis assay demonstrated the ability of the complex to cleave the HL-60 DNA. Apoptotic study showed the complex exhibited significant cancer cell(KB) inhibitory rate.
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Affiliation(s)
- En-Jun Gao
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China.
| | - Shaozhong Zhang
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Yang Meng
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Fu-Chen Zhao
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Xiao-Yu Ma
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Hai-Tao Jin
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Si-Jia Liu
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Jing Ge
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Ya-Guang Sun
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Wan-Zhong Zhang
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Ming-Chang Zhu
- The key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, 110142, China.
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186
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Kremer AB, Osten KM, Yu I, Ebrahimi T, Aluthge DC, Mehrkhodavandi P. Dinucleating Ligand Platforms Supporting Indium and Zinc Catalysts for Cyclic Ester Polymerization. Inorg Chem 2016; 55:5365-74. [PMID: 27187767 DOI: 10.1021/acs.inorgchem.6b00358] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The synthesis of the first alkoxide-bridged indium complex supported by a chiral dinucleating ligand platform (1), along with its zinc analogue (2), is reported. Both complexes are synthesized in a one-pot reaction starting from a chiral dinucleating bis(diamino)phenolate ligand platform, sodium ethoxide, and respective metal salts. The dinucleating indium analogue (7) based on an achiral ligand backbone is also reported. Indium complexes bearing either the chiral or achiral ligand catalyze the ring-opening polymerization of racemic lactide (rac-LA) to afford highly heterotactic poly(lactic acid) (PLA; Pr > 0.85). The indium complex bearing an achiral ligand affords essentially atactic PLA from meso-LA. The role of the dinucleating ligand structure in catalyst synthesis and polymerization activity is discussed.
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Affiliation(s)
- Alexandre B Kremer
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kimberly M Osten
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Insun Yu
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Tannaz Ebrahimi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Dinesh C Aluthge
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
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187
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Liu Y, Frirdich E, Taylor JA, Chan ACK, Blair KM, Vermeulen J, Ha R, Murphy MEP, Salama NR, Gaynor EC, Tanner ME. A Bacterial Cell Shape-Determining Inhibitor. ACS Chem Biol 2016; 11:981-91. [PMID: 26735022 DOI: 10.1021/acschembio.5b01039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Helicobacter pylori and Campylobacter jejuni are human pathogens and causative agents of gastric ulcers/cancer and gastroenteritis, respectively. Recent studies have uncovered a series of proteases that are responsible for maintaining the helical shape of these organisms. The H. pylori metalloprotease Csd4 and its C. jejuni homologue Pgp1 cleave the amide bond between meso-diaminopimelate and iso-d-glutamic acid in truncated peptidoglycan side chains. Deletion of either csd4 or pgp1 results in bacteria with a straight rod phenotype, a reduced ability to move in viscous media, and reduced pathogenicity. In this work, a phosphinic acid-based pseudodipeptide inhibitor was designed to act as a tetrahedral intermediate analog against the Csd4 enzyme. The phosphinic acid was shown to inhibit the cleavage of the alternate substrate, Ac-l-Ala-iso-d-Glu-meso-Dap, with a Ki value of 1.5 μM. Structural analysis of the Csd4-inhibitor complex shows that the phosphinic acid displaces the zinc-bound water and chelates the metal in a bidentate fashion. The phosphinate oxygens also interact with the key acid/base residue, Glu222, and the oxyanion-stabilizing residue, Arg86. The results are consistent with the "promoted-water pathway" mechanism for carboxypeptidase A catalysis. Studies on cultured bacteria showed that the inhibitor causes significant cell straightening when incubated with H. pylori at millimolar concentrations. A diminished, yet observable, effect on the morphology of C. jejuni was also apparent. Cell straightening was more pronounced with an acapsular C. jejuni mutant strain compared to the wild type, suggesting that the capsule impaired inhibitor accessibility. These studies demonstrate that a highly polar compound is capable of crossing the outer membrane and altering cell shape, presumably by inhibiting cell shape determinant proteases. Peptidoglycan proteases acting as cell shape determinants represent novel targets for the development of antimicrobials against these human pathogens.
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Affiliation(s)
- Yanjie Liu
- Contribution
from the Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Emilisa Frirdich
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Jennifer A. Taylor
- Division
of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, United States
- Department
of Microbiology, University of Washington School of Medicine, Seattle, Washington 98195, United States
| | - Anson C. K. Chan
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Kris M. Blair
- Division
of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, United States
- Program
in Molecular and Cellular Biology, University of Washington, Seattle, Washington 98195, United States
| | - Jenny Vermeulen
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Reuben Ha
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Michael E. P. Murphy
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Nina R. Salama
- Division
of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, United States
- Department
of Microbiology, University of Washington School of Medicine, Seattle, Washington 98195, United States
- Program
in Molecular and Cellular Biology, University of Washington, Seattle, Washington 98195, United States
| | - Erin C. Gaynor
- Department
of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Martin E. Tanner
- Contribution
from the Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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188
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Condensation Product of Phenylalanine and Salicylaldehyde: Fluorescent Sensor for Zn2+. J Fluoresc 2016; 26:899-904. [DOI: 10.1007/s10895-016-1778-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 03/02/2016] [Indexed: 10/22/2022]
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189
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Kambe T, Takeda TA, Nishito Y. Activation of zinc-requiring ectoenzymes by ZnT transporters during the secretory process: Biochemical and molecular aspects. Arch Biochem Biophys 2016; 611:37-42. [PMID: 27046342 DOI: 10.1016/j.abb.2016.03.035] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 03/21/2016] [Accepted: 03/30/2016] [Indexed: 01/11/2023]
Abstract
In humans, about 1000 enzymes are estimated to bind zinc. In most of these enzymes, zinc is present at the active site; thus, these enzymes are functional as "zinc-requiring enzymes". Of these zinc-requiring enzymes, zinc-requiring ectoenzymes (defined as secretory, membrane-bound, and organelle-resident enzymes) have received much attention because of their important physiological functions, involvement in a number of diseases, and potential applications as therapeutic targets for diseases. Zinc-requiring ectoenzymes may become active by coordinating zinc at their active site during the secretory process, which requires elaborate control of zinc mobilization from the extracellular milieu to the cytosol and then lumen in the early secretory pathway. Therefore, zinc transporters should properly maintain the process at systemic, cellular, and subcellular levels by mobilizing zinc across biological membranes. However, few studies have examined the mechanisms underlying this process. In this review, current knowledge of the activation process of zinc-requiring ectoenzymes by ZnT zinc transporters in the early secretory pathway is briefly reviewed at the molecular level, with a focus on tissue-nonspecific alkaline phosphatase. Moreover, we also discuss whether zinc-chaperone proteins function during the activation of these enzymes.
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Affiliation(s)
- Taiho Kambe
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan.
| | - Taka-Aki Takeda
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
| | - Yukina Nishito
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan
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190
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Zahim S, Wickramasinghe LA, Evano G, Jabin I, Schrock RR, Müller P. Calix[6]azacryptand Ligand with a Sterically Protected Tren-Based Coordination Site for Metal Ions. Org Lett 2016; 18:1570-3. [DOI: 10.1021/acs.orglett.6b00410] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sara Zahim
- Laboratoire
de Chimie Organique, Université Libre de Bruxelles (ULB), Av.
F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Lasantha A. Wickramasinghe
- Department
of Chemistry, Massachusetts Institute of Technology, 6-331, 77
Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Gwilherm Evano
- Laboratoire
de Chimie Organique, Université Libre de Bruxelles (ULB), Av.
F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Ivan Jabin
- Laboratoire
de Chimie Organique, Université Libre de Bruxelles (ULB), Av.
F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Richard R. Schrock
- Department
of Chemistry, Massachusetts Institute of Technology, 6-331, 77
Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Peter Müller
- Department
of Chemistry, Massachusetts Institute of Technology, 6-331, 77
Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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191
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Abstract
The aim of the study was to investigate the effect of organic zinc supplementation in calves on serum zinc (Zn) concentrations, selected metabolic profile indicators and serum immunoglobulin (Ig) concentrations. The trial included 2 groups (n = 10) of weaned female calves. The Zn-Methionin calves (group Zn-Met) were supplemented with 30 mg Zn-Met/kg dry matter (DM)/day (BIOPLEX® Zn, Alltech, USA) for 90 days; the control calves (group C) received the same diet without organic zinc supplementation. Compared to the control group, organic Zn treatment significantly increased serum Zn concentration (P < 0.05), superoxide dismutase (SOD) activity (P < 0.01) and total Ig (P < 0.01) in the group Zn-Met at the beginning (7 days from the start of Zn-Met supplementation) of the trial. At the end of the trial (day 90) serum total protein (TP) (P < 0.05), albumin (P < 0.01), urea (P < 0.01), SOD (P < 0.01), copper (Cu) (P < 0.05), Zn (P < 0.01) and Ig (P < 0.05) concentrations were significantly higher in the Zn-Met calves. In the control group alkaline phosphatase (ALP) activity was significantly (P < 0.01) higher on day 90. A positive correlation between zinc concentrations, ALP, and SOD activities in serum, and a negative correlation between zinc and copper concentrations were demonstrated. Dietary Zn-Met supplementation in calves markedly influenced the metabolic profile and serum immunoglobulin concentrations. Compared to the control group, the Zn supplemented group showed a significantly (P < 0.05) lower ALP and significantly greater SOD serum activity (P < 0.01) at the end of the trial. Total Ig concentrations were significantly higher in the Zn treated group (day 7: P < 0.01 vs. day 90: P < 0.05).
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192
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Carrano CJ. A Family of Homo- and Heteroscorpionate Ligands: Applications to Bioinorganic Chemistry. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501476] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Carl J. Carrano
- Department of Chemistry and Biochemistry; San Diego State University; 92182-1030 San Diego CA USA
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193
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Visscher A, Bachmann S, Schnegelsberg C, Teuteberg T, Mata RA, Stalke D. Highly selective and sensitive fluorescence detection of Zn(2+) and Cd(2+) ions by using an acridine sensor. Dalton Trans 2016; 45:5689-99. [PMID: 26928871 DOI: 10.1039/c6dt00557h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Fluorescence spectroscopy investigations of the new acridine derivative bis(N,N-dimethylaminemethylene)acridine (3) show remarkable selectivity and sensitivity towards Zn(2+) and Cd(2+) ions in methanol and for the latter even in water. Through the chelation of the metal ions the present PET effect is quenched, significantly enhancing the emission intensity of the fluorophore. In solution, the bonding situation is studied by fluorescence and NMR spectroscopy, as well as ESI-TOF mass-spectrometry measurements. The solid state environment is investigated by X-ray diffraction and computational calculations. Here, we can show the complexation of the zinc and cadmium ions by the methylene bridged amine receptors as well as by the nitrogen atom of the acridine system.
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Affiliation(s)
- A Visscher
- Institut für Anorganische Chemie der Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany.
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194
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Zikode M, Ojwach SO, Akerman MP. Bis(pyrazolylmethyl)pyridine Zn(II) and Cu(II) complexes: Molecular structures and kinetic studies of ring-opening polymerization of ε-caprolactone. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2015.12.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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195
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Boulmene R, Boussouf K, Prakash M, Komiha N, Al-Mogren MM, Hochlaf M. Ab Initio and DFT Studies on CO2Interacting with Znq+-Imidazole (q=0, 1, 2) Complexes: Prediction of Charge Transfer through σ- or π-Type Models. Chemphyschem 2016; 17:994-1005. [DOI: 10.1002/cphc.201501185] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Reda Boulmene
- Université Paris-Est; Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS; 5 bd Descartes 77454 Marne-la-Vallée France
| | - Karim Boussouf
- Université Paris-Est; Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS; 5 bd Descartes 77454 Marne-la-Vallée France
| | - Muthuramalingam Prakash
- Université Paris-Est; Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS; 5 bd Descartes 77454 Marne-la-Vallée France
| | - Najia Komiha
- LS3 ME-Team of theoretical chemistry and modeling; Faculty of Sciences; University Mohammed V; Rabat Morocco
| | - Muneerah M. Al-Mogren
- Chemistry Department; Faculty of Science; King Saud University; P.O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia
| | - Majdi Hochlaf
- Université Paris-Est; Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS; 5 bd Descartes 77454 Marne-la-Vallée France
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196
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Zhang Y, Liu J, Zhang CY. Real-time monitoring of small biological molecules by ligation-mediated polymerase chain reaction. Chem Commun (Camb) 2016; 51:12270-3. [PMID: 26139082 DOI: 10.1039/c5cc04269k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We develop a ligation-mediated polymerase chain reaction (PCR) for real-time detection of small biological molecules in a high-throughput format. This method is extremely sensitive with a detection limit of as low as 18.8 fM for ATP and 17.3 fM for NAD(+), and it can discriminate target molecules from their analogues as well.
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Affiliation(s)
- Yan Zhang
- Single-Molecule Detection and Imaging Laboratory, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
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197
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Daver H, Das B, Nordlander E, Himo F. Theoretical Study of Phosphodiester Hydrolysis and Transesterification Catalyzed by an Unsymmetric Biomimetic Dizinc Complex. Inorg Chem 2016; 55:1872-82. [DOI: 10.1021/acs.inorgchem.5b02733] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Henrik Daver
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106
91 Stockholm, Sweden
| | - Biswanath Das
- Inorganic Chemistry Research Group, Chemical Physics, Center for
Chemistry and Chemical Engineering, Lund University, Box 124, SE-221
00 Lund, Sweden
| | - Ebbe Nordlander
- Inorganic Chemistry Research Group, Chemical Physics, Center for
Chemistry and Chemical Engineering, Lund University, Box 124, SE-221
00 Lund, Sweden
| | - Fahmi Himo
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106
91 Stockholm, Sweden
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198
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A Pyrene-functionalized Polynorbornene for Ratiometric Fluorescence Sensing of Pyrophosphate. Chem Asian J 2016; 11:687-90. [DOI: 10.1002/asia.201501363] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Indexed: 12/31/2022]
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199
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Soliman AA, Alajrawy OI, Attabi FA, Linert W. New dinuclear palladium(ii) complexes with formamidine and bridged pyrophosphate ligands. NEW J CHEM 2016. [DOI: 10.1039/c6nj01262k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
New dinuclear palladium(ii) complexes with formamidine and bridged pyrophosphate ligands were synthesized and characterized. The complexes are diamagnetic with a distorted square planar geometry. The IC50 values are in the range of 0.036–0.61 μM.
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Affiliation(s)
- Ahmed A. Soliman
- Department of Chemistry
- Faculty of Science
- Cairo University
- 12613 Giza
- Egypt
| | - Othman I. Alajrawy
- Department of Chemistry
- Faculty of Science
- Cairo University
- 12613 Giza
- Egypt
| | - Fawzy A. Attabi
- Department of Chemistry
- Faculty of Science
- Cairo University
- 12613 Giza
- Egypt
| | - Wolfgang Linert
- Institute of Applied Synthetic Chemistry
- Vienna University of Technology
- A-1060 Vienna
- Austria
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200
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Paul TJ, Barman A, Ozbil M, Bora RP, Zhang T, Sharma G, Hoffmann Z, Prabhakar R. Mechanisms of peptide hydrolysis by aspartyl and metalloproteases. Phys Chem Chem Phys 2016; 18:24790-24801. [DOI: 10.1039/c6cp02097f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Peptide hydrolysis has been involved in a wide range of biological, biotechnological, and industrial applications.
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Affiliation(s)
- Thomas J. Paul
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
| | - Arghya Barman
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
| | - Mehmet Ozbil
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
| | | | - Tingting Zhang
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
| | - Gaurav Sharma
- Department of Chemistry
- University of Miami
- Coral Gables
- USA
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