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Direct observation of ultrafast-electron-transfer reactions unravels high effectiveness of reductive DNA damage. Proc Natl Acad Sci U S A 2011; 108:11778-83. [PMID: 21730183 DOI: 10.1073/pnas.1104367108] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Both water and electron-transfer reactions play important roles in chemistry, physics, biology, and the environment. Oxidative DNA damage is a well-known mechanism, whereas the relative role of reductive DNA damage is unknown. The prehydrated electron (e(pre)-), a novel species of electrons in water, is a fascinating species due to its fundamental importance in chemistry, biology, and the environment. e(pre)- is an ideal agent to observe reductive DNA damage. Here, we report both the first in situ femtosecond time-resolved laser spectroscopy measurements of ultrafast-electron-transfer (UET) reactions of e(pre)- with various scavengers (KNO(3), isopropanol, and dimethyl sulfoxide) and the first gel electrophoresis measurements of DNA strand breaks induced by e(pre)- and OH(•) radicals co-produced by two-UV-photon photolysis of water. We strikingly found that the yield of reductive DNA strand breaks induced by each e(pre)- is twice the yield of oxidative DNA strand breaks induced by each OH(•) radical. Our results not only unravel the long-standing mystery about the relative role of radicals in inducing DNA damage under ionizing radiation, but also challenge the conventional notion that oxidative damage is the main pathway for DNA damage. The results also show the potential of femtomedicine as a new transdisciplinary frontier and the broad significance of UET reactions of e(pre)- in many processes in chemistry, physics, biology, and the environment.
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Liu H, Chen X, Bu Y. Redox-induced configuration conversion for thioacetamide dimer can function as a molecular switch. J Comput Chem 2010; 31:2533-9. [DOI: 10.1002/jcc.21512] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wang CR, Nguyen J, Lu QB. Bond breaks of nucleotides by dissociative electron transfer of nonequilibrium prehydrated electrons: a new molecular mechanism for reductive DNA damage. J Am Chem Soc 2009; 131:11320-2. [PMID: 19634911 DOI: 10.1021/ja902675g] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
DNA damage is a central mechanism in the pathogenesis and treatment of human diseases, notably cancer. Little is known about reductive DNA damage in causing genetic mutations during oncogenesis and killing cancer cells during radiotherapy. The prehydrated electron (e(-)(pre)) has the highest yield among all the radicals generated in cells during ionizing radiation and has subpicosecond lifetimes (10(-13) s) and energies below 0 eV, but its role in DNA damage is unknown. In this work, our real-time measurements by femtosecond time-resolved laser spectroscopy have revealed that while adenine and cytosine can effectively trap an e(-)(pre) to form stable anions, thymidine and especially guanine are highly susceptible to dissociative electron transfer of e(-)(pre), leading to bond dissociation in DNA. Our finding demonstrates a dissociative electron transfer pathway for reductive DNA damage that might be related to various diseases such as cancer and stroke. Moreover, this finding challenges the conventional notion that damage to the genome is mainly induced by the oxidizing OH* radical and might eventually lead to improved radiotherapy of cancer and radioprotection of humans.
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Affiliation(s)
- Chun-Rong Wang
- Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Gil A, Sodupe M, Bertran J. Influence of ionization on the conformational preferences of peptide models. Ramachandran surfaces of N-formyl-glycine amide and N-formyl-alanine amide radical cations. J Comput Chem 2009; 30:1771-84. [PMID: 19090571 DOI: 10.1002/jcc.21178] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Ramachandran maps of neutral and ionized HCO-Gly-NH2 and HCO-Ala-NH2 peptide models have been built at the B3LYP/6-31++G(d,p) level of calculation. Direct optimizations using B3LYP and the recently developed MPWB1K functional have also been carried out, as well as single-point calculations at the CCSD(T) level of theory with the 6-311++G(2df,2p) basis set. Results indicate that for both peptide models ionization can cause drastic changes in the shape of the PES in such a way that highly disallowed regions in neutral PES become low-energy regions in the radical cation surface. The structures localized in such regions, epsilonL+* and epsilonD+* are highly stabilized due to the formation of 2-centre-3-electron interactions between the two carbonyl oxygens. Inclusion of solvent effects by the conductor-like polarizable continuum model (CPCM) shows that the solute-solvent interaction energy plays an important role in determining the stability order.
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Affiliation(s)
- Adrià Gil
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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Dumont É, Laurent AD, Loos PF, Assfeld X. Analyzing the Selectivity and Successiveness of a Two-Electron Capture on a Multiply Disulfide-Linked Protein. J Chem Theory Comput 2009; 5:1700-8. [DOI: 10.1021/ct900093h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Élise Dumont
- Laboratoire de Chimie, UMR 5182 CNRS École Normale Supérieure de Lyon, 46, allée d’Italie, 69364 Lyon Cedex 07, France, and Équipe de Chimie et Biochimie Théoriques, UMR 7565 CNRS-UHP, Institut Jean Barriol (FR CNRS 2843), Faculté des Sciences et Techniques, Nancy-Université, B.P. 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Adèle D. Laurent
- Laboratoire de Chimie, UMR 5182 CNRS École Normale Supérieure de Lyon, 46, allée d’Italie, 69364 Lyon Cedex 07, France, and Équipe de Chimie et Biochimie Théoriques, UMR 7565 CNRS-UHP, Institut Jean Barriol (FR CNRS 2843), Faculté des Sciences et Techniques, Nancy-Université, B.P. 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Pierre-François Loos
- Laboratoire de Chimie, UMR 5182 CNRS École Normale Supérieure de Lyon, 46, allée d’Italie, 69364 Lyon Cedex 07, France, and Équipe de Chimie et Biochimie Théoriques, UMR 7565 CNRS-UHP, Institut Jean Barriol (FR CNRS 2843), Faculté des Sciences et Techniques, Nancy-Université, B.P. 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Xavier Assfeld
- Laboratoire de Chimie, UMR 5182 CNRS École Normale Supérieure de Lyon, 46, allée d’Italie, 69364 Lyon Cedex 07, France, and Équipe de Chimie et Biochimie Théoriques, UMR 7565 CNRS-UHP, Institut Jean Barriol (FR CNRS 2843), Faculté des Sciences et Techniques, Nancy-Université, B.P. 70239, 54506 Vandoeuvre-lès-Nancy, France
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Liu JH, Tsai CY, Chiu YH, Hsieh FM. The fabrication of polycrystalline silver nanowires via self-assembled nanotubes at controlled temperature. NANOTECHNOLOGY 2009; 20:035301. [PMID: 19417290 DOI: 10.1088/0957-4484/20/3/035301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report a novel method for the fabrication of silver nanowires under controlled conditions. Silver nanoparticles were synthesized using a surfactant of octanoic acid via a reverse micelle technique. Hollow nanotubes were prepared under various controlled conditions through self-assembly of surfactant clusters of reversed micelles containing silver nanoparticles. These organized nanotubes were used as a structure-directing template for the preparation of silver nanowires. This is a bottom-up technique for the fabrication of silver nanowires. Self-assembled nanotube construction and the cross section of the nanotubes were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. From the results, reasonable schematic representations of the formation of self-assembled nanoparticles and nanowires were proposed. Further sintering treatment at 500 degrees C burned away the organic compounds and left silver nanowires. The construction of the nanowires was confirmed using SEM, x-ray diffraction (XRD), and energy dispersive x-ray analysis (EDXA). This paper demonstrates that silver nanowires can be fabricated via self-assembled nanoparticles at a controlled low temperature.
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Affiliation(s)
- Jui-Hsiang Liu
- Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China.
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Chen X, Zhang L, Wang Z, Li J, Wang W, Bu Y. Relay Stations for Electron Hole Migration in Peptides: Possibility for Formation of Three-Electron Bonds along Peptide Chains. J Phys Chem B 2008; 112:14302-11. [DOI: 10.1021/jp805910x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xiaohua Chen
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
| | - Liang Zhang
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
| | - Zhiping Wang
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
| | - Jilai Li
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
| | - Wen Wang
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
| | - Yuxiang Bu
- The Center for Modeling and Simulation Chemistry, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, People's Republic of China
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Gauduel Y, Glinec Y, Malka V. Femtoradical events in aqueous molecular environments: the tenuous borderline between direct and indirect radiation damages. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/101/1/012004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Wang CR, Drew K, Luo T, Lu MJ, Lu QB. Resonant dissociative electron transfer of the presolvated electron to CCl4 in liquid: Direct observation and lifetime of the CCl4*− transition state. J Chem Phys 2008; 128:041102. [DOI: 10.1063/1.2836749] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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Wang CR, Luo T, Lu QB. On the lifetimes and physical nature of incompletely relaxed electrons in liquid water. Phys Chem Chem Phys 2008; 10:4463-70. [DOI: 10.1039/b806287k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Direct observation of elementary radical events: low- and high-energy radiation femtochemistry in solutions. Radiat Phys Chem Oxf Engl 1993 2005. [DOI: 10.1016/j.radphyschem.2004.06.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Probing the stability of the disulfide radical intermediate of thioredoxin using direct electrochemistry. Int J Pept Res Ther 2003. [DOI: 10.1007/s10989-004-2410-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Probing the stability of the disulfide radical intermediate of thioredoxin using direct electrochemistry. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/bf02442581] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Gauduel Y, Hallou A, Charles B. Short-Time Water Caging and Elementary Prehydration Redox Reactions in Ionic Environments. J Phys Chem A 2003. [DOI: 10.1021/jp021745p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Gauduel
- Laboratoire d'Optique Appliquée, CNRS UMR 7639 and INSERM U451, Ecole Polytechnique−ENS Techniques Avancées, 91761 Palaiseau Cedex, France
| | - A. Hallou
- Laboratoire d'Optique Appliquée, CNRS UMR 7639 and INSERM U451, Ecole Polytechnique−ENS Techniques Avancées, 91761 Palaiseau Cedex, France
| | - B. Charles
- Laboratoire d'Optique Appliquée, CNRS UMR 7639 and INSERM U451, Ecole Polytechnique−ENS Techniques Avancées, 91761 Palaiseau Cedex, France
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Li YL, Wang D, Phillips DL. Time-resolved resonance Raman spectroscopy and density functional theory investigation of the CH2I–I isomer and CH2I2⋯I molecular complex products produced from ultraviolet photolysis of CH2I2 in the solution phase: Comparison of the structure and chemical reactivity of polyhalomethane isomers and polyhalomethane–halogen atom molecular complexes. J Chem Phys 2002. [DOI: 10.1063/1.1511724] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Maity DK. Structure, bonding, and spectra of cyclic dithia radical cations: a theoretical study. J Am Chem Soc 2002; 124:8321-8. [PMID: 12105913 DOI: 10.1021/ja0261067] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ab initio molecular orbital and hybrid density functional theory methods are employed to characterize the structure, bonding and properties of several cyclic dithia radical cation systems, particularly in the context of intra molecular two-center three-electron (2c-3e) bonding between two sulfur atoms. The calculated results are able to interpret the time-resolved transient optical spectra obtained from pulse radiolysis technique for these positively charged dithia systems in aqueous solution. Visualization of the appropriate molecular orbital (MO) in the systems is able to depict the presence of a 2c-3e bond between two sulfur atoms and its sigma character. Geometry optimizations of these doublet systems are carried out at restricted open shell Becke's half-and-half (BHH) nonlocal exchange and Lee-Yang-Parr (LYP) nonlocal correlation functionals (BHHLYP) with 6-311+G(d,p) basis set including solvent effects adopting Onsager's reaction field model. Hessian calculations are done at the same level to check the nature of the equilibrium geometry. Energy data are further improved by performing MP2/6-311+G(d,p) calculations on these radical cation systems. Excited-state calculations are done following configuration interaction with single-electron excitation (CIS) method and the optical transition wavelength from the highest doubly occupied molecular orbital (HDOMO) to the lowest singly occupied molecular orbital (LSOMO) is seen to correspond and match to the position of the absorption maxima (lambda(max)) obtained from the experimental spectra for all these radical cation systems in aqueous solution. These calculations are able to resolve a long-standing ambiguity in the assignment of intra molecular 2c-3e bonding in the case of the 3-methyl-2,4-dithiapentane radical cation system and to provide new insights into bonding features of this odd electron system as well as of other cyclic dithia systems studied.
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Affiliation(s)
- Dilip K Maity
- Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India.
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Affiliation(s)
- Dilip K. Maity
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Hallou A, Guilloud F, Gauduel Y. During IR electron transfers in solution. J Mol Liq 2002. [DOI: 10.1016/s0167-7322(01)00352-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Gauduel Y, Launay T, Hallou A. Femtosecond Probing of a 2c/3e Disulfide Bond Making in Liquid Phase. J Phys Chem A 2002. [DOI: 10.1021/jp0123684] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Gauduel
- Laboratoire d'Optique Appliquée, INSERM U451, CNRS UMR 7639, Ecole Polytechnique-ENS Techniques Avancées, 91761 Palaiseau Cedex, France
| | - T. Launay
- Laboratoire d'Optique Appliquée, INSERM U451, CNRS UMR 7639, Ecole Polytechnique-ENS Techniques Avancées, 91761 Palaiseau Cedex, France
| | - A. Hallou
- Laboratoire d'Optique Appliquée, INSERM U451, CNRS UMR 7639, Ecole Polytechnique-ENS Techniques Avancées, 91761 Palaiseau Cedex, France
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