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Lechner VM, Nappi M, Deneny PJ, Folliet S, Chu JCK, Gaunt MJ. Visible-Light-Mediated Modification and Manipulation of Biomacromolecules. Chem Rev 2021; 122:1752-1829. [PMID: 34546740 DOI: 10.1021/acs.chemrev.1c00357] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Chemically modified biomacromolecules-i.e., proteins, nucleic acids, glycans, and lipids-have become crucial tools in chemical biology. They are extensively used not only to elucidate cellular processes but also in industrial applications, particularly in the context of biopharmaceuticals. In order to enable maximum scope for optimization, it is pivotal to have a diverse array of biomacromolecule modification methods at one's disposal. Chemistry has driven many significant advances in this area, and especially recently, numerous novel visible-light-induced photochemical approaches have emerged. In these reactions, light serves as an external source of energy, enabling access to highly reactive intermediates under exceedingly mild conditions and with exquisite spatiotemporal control. While UV-induced transformations on biomacromolecules date back decades, visible light has the unmistakable advantage of being considerably more biocompatible, and a spectrum of visible-light-driven methods is now available, chiefly for proteins and nucleic acids. This review will discuss modifications of native functional groups (FGs), including functionalization, labeling, and cross-linking techniques as well as the utility of oxidative degradation mediated by photochemically generated reactive oxygen species. Furthermore, transformations at non-native, bioorthogonal FGs on biomacromolecules will be addressed, including photoclick chemistry and DNA-encoded library synthesis as well as methods that allow manipulation of the activity of a biomacromolecule.
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Affiliation(s)
- Vivian M Lechner
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Manuel Nappi
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Patrick J Deneny
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Sarah Folliet
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - John C K Chu
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Matthew J Gaunt
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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2
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Sánchez-Murcia PA, Nogueira JJ, González L. Exciton Localization on Ru-Based Photosensitizers Induced by Binding to Lipid Membranes. J Phys Chem Lett 2018; 9:683-688. [PMID: 29363982 DOI: 10.1021/acs.jpclett.7b03357] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The characterization of electronic properties of metal complexes embedded in membrane environments is of paramount importance to develop efficient photosensitizers in optogenetic applications. Molecular dynamics and QM/MM simulations together with quantitative wave function analysis reveal a directional electronic redistribution of the exciton formed upon excitation of [Ru(bpy)2(bpy-C17)]2+ when going from water to a lipid bilayer, despite the fact that the media influence neither the metal-to-ligand charge-transfer character nor the excitation energy of the absorption spectra. When the photosensitizer is embedded into the DOPC lipid membrane, exciton population is mainly located in the bypyridyl sites proximal to the positively charged surface of the bilayer due to electrostatic interactions. This behavior shows that the electronic structure of metal complexes can be controlled through the binding to external species, underscoring the crucial role of the environment in directing the electronic flow upon excitation and thus helping rational tuning of optogenetic agents.
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Affiliation(s)
- Pedro A Sánchez-Murcia
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna , Währinger Str. 17, A-1090 Vienna, Austria
| | - Juan J Nogueira
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna , Währinger Str. 17, A-1090 Vienna, Austria
| | - Leticia González
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna , Währinger Str. 17, A-1090 Vienna, Austria
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3
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Kajouj S, Marcélis L, Lemaur V, Beljonne D, Moucheron C. Photochemistry of ruthenium(ii) complexes based on 1,4,5,8-tetraazaphenanthrene and 2,2′-bipyrazine: a comprehensive experimental and theoretical study. Dalton Trans 2017; 46:6623-6633. [DOI: 10.1039/c7dt00620a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Comprehensive study of ruthenium complexes based on 2,2′-bipyrazine and 1,4,5,8-tetraazaphenanthrene, which can be used as photoreactive materials for biomedical applications.
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Affiliation(s)
- Sofia Kajouj
- Organic Chemistry and Photochemistry
- Université Libre de Bruxelles
- (U. L. B.)
- Bruxelles
- Belgium
| | - Lionel Marcélis
- Organic Chemistry and Photochemistry
- Université Libre de Bruxelles
- (U. L. B.)
- Bruxelles
- Belgium
| | - Vincent Lemaur
- Laboratory for Chemistry of Novel Materials
- University of Mons (UMons)
- 7000 Mons
- Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials
- University of Mons (UMons)
- 7000 Mons
- Belgium
| | - Cécile Moucheron
- Organic Chemistry and Photochemistry
- Université Libre de Bruxelles
- (U. L. B.)
- Bruxelles
- Belgium
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Gresh N, El Hage K, Perahia D, Piquemal JP, Berthomieu C, Berthomieu D. Polarizable molecular mechanics studies of Cu(I)/Zn(II) superoxide dismutase: Bimetallic binding site and structured waters. J Comput Chem 2014; 35:2096-106. [DOI: 10.1002/jcc.23724] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 08/09/2014] [Accepted: 08/12/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Nohad Gresh
- Chemistry and Biology, Nucleo(s)tides and Immunology for Therapy (CBNIT); UMR 8601 CNRS, UFR Biomédicale Paris France
| | - Krystel El Hage
- Chemistry and Biology, Nucleo(s)tides and Immunology for Therapy (CBNIT); UMR 8601 CNRS, UFR Biomédicale Paris France
- Unité de Biochimie, Université Saint-Joseph; Beirut Lebanon
| | - David Perahia
- Laboratoire de Biologie et Pharmacologie Appliquée (LBPA); UMR 8113, Ecole Normale Supérieure France
| | - Jean-Philip Piquemal
- Laboratoire de Chimie Théorique, Sorbonne Universités; UPMC, UMR7616 CNRS Paris France
| | - Catherine Berthomieu
- CEA, DSV, IBEB, Laboratoire des Interactions Protéine-Métal; Saint-Paul-lez-Durance France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale; Saint-Paul-lez-Durance France
| | - Dorothée Berthomieu
- Institut Charles Gerhardt, UMR 5253, CNRS-UM2-UM1-ENSCM; 8 rue de l'Ecole Normale 34296 Montpellier Cedex 5 France
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5
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Photoelectrocatalytic oxidation of uric acid on a novel ruthenium(II) polypyridyl complex modified ZnO electrode for photo-stimulated fuel cells. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.05.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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DNA-binding properties of ruthenium(II) complexes with the bidentate ligand 5-chloro-2-(phenylazo)pyridine. TRANSIT METAL CHEM 2012. [DOI: 10.1007/s11243-012-9576-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Wu FH, Zeng CH, Liu YJ, Guan XY, He LX. DNA interaction studies of ruthenium(II) polypyridyl complex : [Ru(dmb)2(ITAP)](ClO4)2 (ITAP = isatino [1,2-b]-1,4,8,9-tetraazatriphenylene). J COORD CHEM 2010. [DOI: 10.1080/00958970903095806] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Fu-Hai Wu
- a School of Public Health, Guangdong Pharmaceutical University , Guangzhou, 510006, P.R. China
| | - Cheng-Hui Zeng
- b School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou, 510006, P.R. China
| | - Yun-Jun Liu
- b School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou, 510006, P.R. China
| | - Xiao-Yan Guan
- b School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou, 510006, P.R. China
| | - Li-Xin He
- b School of Pharmacy, Guangdong Pharmaceutical University , Guangzhou, 510006, P.R. China
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Guillon T, Boggio-Pasqua M, Alary F, Heully JL, Lebon E, Sutra P, Igau A. Theoretical Investigation on the Photophysical Properties of Model Ruthenium Complexes with Diazabutadiene Ligands [Ru(bpy)3−x(dab)x]2+ (x = 1−3). Inorg Chem 2010; 49:8862-72. [DOI: 10.1021/ic1009863] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas Guillon
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université de Toulouse, 118 route de Narbonne, 31062 Toulouse, France
| | - Martial Boggio-Pasqua
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université de Toulouse, 118 route de Narbonne, 31062 Toulouse, France
| | - Fabienne Alary
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université de Toulouse, 118 route de Narbonne, 31062 Toulouse, France
| | - Jean-Louis Heully
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université de Toulouse, 118 route de Narbonne, 31062 Toulouse, France
| | - Emilie Lebon
- Laboratoire de Chimie de Coordination, UPR 8241, CNRS, 205 route de Narbonne, 31077 Toulouse, France
| | - Pierre Sutra
- Laboratoire de Chimie de Coordination, UPR 8241, CNRS, 205 route de Narbonne, 31077 Toulouse, France
| | - Alain Igau
- Laboratoire de Chimie de Coordination, UPR 8241, CNRS, 205 route de Narbonne, 31077 Toulouse, France
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Synthesis, Structure, DNA-Binding Properties, and Cytotoxicity of Ruthenium(II) Polypyridyl Complexes. Chem Biodivers 2010; 7:1770-83. [DOI: 10.1002/cbdv.200900213] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wojdyla M, Smith JA, Vasudevan S, Quinn SJ, Kelly JM. Excited state behaviour of substituted dipyridophenazine Cr(III) complexes in the presence of nucleic acids. Photochem Photobiol Sci 2010; 9:1196-202. [PMID: 20617266 DOI: 10.1039/c0pp00110d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photophysics and photochemistry of [Cr(phen)(2)(dppz)](3+) and its 11,12-substituted derivatives [Cr(phen)(2)(X(2)dppz)](3+) {X = Me or F} have been studied in the presence of purine nucleotides or DNA using steady state and time-resolved absorption and luminescence spectroscopy. 5'-Adenosine monophosphate (5'-AMP) shows only a weak interaction with the excited states of each complex. By contrast they are efficiently quenched by 5'-guanosine monophosphate (5'-GMP), consistent with photo-induced electron transfer. Laser flash photolysis spectroscopy in the presence of 5'-GMP suggests that both forward and back electron-transfers are rapid. All complexes also display a strong affinity for DNA and evidence for both static and dynamic quenching mechanisms is provided.
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Affiliation(s)
- Michal Wojdyla
- School of Chemistry, University of Dublin, Trinity College, College Green, Dublin 2, Republic of Ireland
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11
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Gao F, Chao H, Ji LN. DNA Binding, Photocleavage, and Topoisomerase Inhibition of Functionalized Ruthenium(II)-Polypyridine Complexes. Chem Biodivers 2008; 5:1962-1979. [DOI: 10.1002/cbdv.200890181] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Alary F, Boggio-Pasqua M, Heully JL, Marsden CJ, Vicendo P. Theoretical Characterization of the Lowest Triplet Excited States of the Tris-(1,4,5,8-tetraazaphenanthrene) Ruthenium Dication Complex. Inorg Chem 2008; 47:5259-66. [DOI: 10.1021/ic800246t] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabienne Alary
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
| | - Martial Boggio-Pasqua
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
| | - Jean-Louis Heully
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
| | - Colin J. Marsden
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
| | - Patricia Vicendo
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, IRSAMC, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623, CNRS et Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
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13
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Gao F, Chao H, Zhou F, Chen X, Wei YF, Ji LN. Synthesis, GC selective DNA binding and topoisomerase II inhibition activities of ruthenium(II) polypyridyl complex containing 11-aminopteridino[6,7-f][1,10]phenanthrolin-13(12H)-one. J Inorg Biochem 2008; 102:1050-9. [DOI: 10.1016/j.jinorgbio.2007.12.025] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Revised: 12/20/2007] [Accepted: 12/24/2007] [Indexed: 11/24/2022]
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14
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Gao F, Chao H, Wei YF, Yuan YX, Peng B, Chen X, Zheng KC, Ji LN. Synthesis, DNA-Binding and Photocleavage Studies of the Ruthenium(II) Complexes [Ru(phen)2(ppd)]2+ and [Ru(phen)(ppd)2]2+ (ppd=Pteridino[6,7-f] [1,10]phenanthroline-11,13(10H,12H)-dione, phen=1,10-Phenanthroline). Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890045] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Herman L, Ghosh S, Defrancq E, Mesmaekera AKD. Ru(II) complexes and light: molecular tools for biomolecules. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1355] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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16
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Shao F, Elias B, Lu W, Barton JK. Synthesis and characterization of iridium(III) cyclometalated complexes with oligonucleotides: insights into redox reactions with DNA. Inorg Chem 2007; 46:10187-99. [PMID: 17973372 DOI: 10.1021/ic7014012] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Heteroleptic cyclometalated complexes of Ir(III) containing the dipyridophenazine ligand are synthesized through the direct introduction of a functionalized dipyridophenazine ligand onto a bis(dichloro)-bridged Ir(III) precusor and characterized by 1H NMR, mass spectrometry, as well as spectroscopic and electrochemical properties. The excited state of the Ir(III) complexes have sufficient driving force to oxidize purines and to reduce pyrimidine nucleobases. Luminescence and EPR measurements of the Ir(III) complex with an unmodified dppz bound to DNA show the formation of a guanine radical upon irradiation, resulting from an oxidative photoinduced electron-transfer process. Evidence is also obtained indirectly for reductive photoinduced electron transfer from the excited complex to the thymine base in DNA. We have also utilized cyclopropylamine-substituted nucleosides as ultrafast kinetic traps to report transient charge occupancy in oligonucleotides when DNA is irradiated in the presence of noncovalently bound complexes. These experiments establish that the derivatized Ir(III) complexes, with photoactivation, can trigger the oxidation of guanine and the reduction of cytosine.
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Affiliation(s)
- Fangwei Shao
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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Herman L, Elias B, Pierard F, Moucheron C, Mesmaeker AKD. Effects of Protonation on the Spectroscopic Properties of Tetrapyridoacridine (TPAC) Mono- and Dinuclear Ru(II) Complexes in Their Ground and 3MLCT Excited States. J Phys Chem A 2007; 111:9756-63. [PMID: 17727275 DOI: 10.1021/jp072782p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The spectroscopic behavior of mono- and dinuclear Ru(II) complexes (P, T, PP and TT, Figure 1) that contain the extended planar ligand tetrapyrido[3,2-a:2',3'-c:3' ',2' '-h:2' '',3' ''-j]acridine (TPAC) and either 1,10-phenanthroline (phen) or 1,4,5,8-tetraazaphenanthrene (tap) as ancillary ligands is examined in water and as a function of the pH. These four complexes luminesce in aqueous solution. The analyses of the data in absorption lead to the pKa values in the ground state, and the data in emission show that the excited 3MLCT states are much more basic than the ground state. When the complex contains tap ligands (T and TT), a decrease in pH transforms the luminescent excited basic form into another luminescent excited protonated species, which emits more bathochromically. In contrast, with phen ancillary ligands (P and PP), the protonated excited state does not luminesce. The rate constant of first protonation of the 3MLCT state is diffusion controlled, except for the dinuclear PP complex, whose protonation takes place on the nitrogen of the acridine motif. For P, in which the protonation process is the fastest, it would take place on the nitrogen atoms of the nonchelated phen moiety of the TPAC ligand. These results allow also us to gain information on the localization of the excited electron in the 1MLCT state populated upon absorption as well as in the relaxed 3MLCT emissive state. Moreover as these complexes are interesting for their study with DNA, it can be concluded from these data that a portion of the excited species in interaction with DNA will be protonated.
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Affiliation(s)
- Leslie Herman
- Service de Chimie Organique et Photochimie, CP 160/08, Université libre de Bruxelles, 50 Avenue F.D. Roosevelt, B-1050 Bruxelles, Belgium
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Gao F, Chao H, Wang JQ, Yuan YX, Sun B, Wei YF, Peng B, Ji LN. Targeting topoisomerase II with the chiral DNA-intercalating ruthenium(II) polypyridyl complexes. J Biol Inorg Chem 2007; 12:1015-27. [PMID: 17659367 DOI: 10.1007/s00775-007-0272-4] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Accepted: 06/12/2007] [Indexed: 10/23/2022]
Abstract
Many antitumor drugs act as topoisomerase inhibitors, and the inhibitions are usually related to DNA binding. Here we designed and synthesized DNA-intercalating Ru(II) polypyridyl complexes Delta--[Ru(bpy)(2)(uip)](2+) and Lambda-[Ru(bpy)(2)(uip)](2+) (bpy is 2,2'-bipyridyl, uip is 2-(5-uracil)-1H-imidazo[4,5-f][1,10]phenanthroline). The DNA binding, photocleavage, topoisomerase inhibition, and cytotoxicity of the complexes were studied. As we expected, the synthesized Ru(II) complexes can intercalate into DNA base pairs and cleave the pBR322 DNA with high activity upon irradiation. The mechanism studies reveal that singlet oxygen ((1)O(2)) and superoxide anion radical (O (2) (*-) ) may play an important role in the photocleavage. The inhibition of topoisomerases I and II by the Ru(II) complexes has been studied. The results suggest that both complexes are efficient inhibitors towards topoisomerase II by interference with the DNA religation and direct topoisomerase II binding. Both complexes show antitumor activity towards HELA, hepG2, BEL-7402, and CNE-1 tumor cells.
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Affiliation(s)
- Feng Gao
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China
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Alary F, Heully JL, Bijeire L, Vicendo P. Is the 3MLCT the Only Photoreactive State of Polypyridyl Complexes? Inorg Chem 2007; 46:3154-65. [PMID: 17373787 DOI: 10.1021/ic062193i] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
By means of Delta-SCF and time-dependent density functional theory (DFT) calculations on [Ru(LL)3]2+ (LL = bpy = 2,2'-bipyridyl or bpz = 2,2' -bipyrazyl) complexes, we have found that emission of these two complexes could originate from two metal-to-ligand charge-transfer triplet states (3MLCT) that are quasi-degenerate and whose symmetries are D3 and C2. These two states are true minima. Calculated absorption and emission energies are in good agreement with experiment; the largest error is 0.14 eV, which is about the expected accuracy of the DFT calculations. For the first time, an optimized geometry for the metal-centered (MC) state is proposed for both of these complexes, and their energies are found to be almost degenerate with their corresponding 3MLCT states. These [RuII(LL)(eta1-LL)2]2+ MC states have two vacant coordination sites on the metal, so they may react readily with their environment. If these MC states are able to de-excite by luminescence, the associated transition (ca. 1 eV) is found to be quite different from those of the 3MLCT states (ca. 2 eV).
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Affiliation(s)
- F Alary
- Laboratoire de chimie et physique quantiques, IRSAMC, Université Paul Sabatier, Toulouse Cedex, France.
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Synthesis and Characterization of Mononuclear Octahedral Fe(III) Complex Containing a Biomimetic Tripodal Ligand, N-(Benzimidazol-2-ylmethyl)iminodiacetic Acid. B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.10.1597] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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