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Trometer N, Cichocki B, Chevalier Q, Pécourneau J, Strub JM, Hemmerlin A, Specht A, Davioud-Charvet E, Elhabiri M. Synthesis and Photochemical Properties of Fluorescent Metabolites Generated from Fluorinated Benzoylmenadiones in Living Cells. J Org Chem 2024; 89:2104-2126. [PMID: 37267444 DOI: 10.1021/acs.joc.3c00620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This work describes the reactivity and properties of fluorinated derivatives (F-PD and F-PDO) of plasmodione (PD) and its metabolite, the plasmodione oxide (PDO). Introduction of a fluorine atom on the 2-methyl group markedly alters the redox properties of the 1,4-naphthoquinone electrophore, making the compound highly oxidizing and particularly photoreactive. A fruitful set of analytical methods (electrochemistry, absorption and emission spectrophotometry, and HRMS-ESI) have been used to highlight the products resulting from UV photoirradiation in the absence or presence of selected nucleophiles. With F-PDO and in the absence of nucleophile, photoreduction generates a highly reactive ortho-quinone methide (o-QM) capable of leading to the formation of a homodimer. In the presence of thiol nucleophiles such as β-mercaptoethanol, which was used as a model, o-QMs are continuously regenerated in sequential photoredox reactions generating mono- or disulfanylation products as well as various unreported sulfanyl products. Besides, these photoreduced adducts derived from F-PDO are characterized by a bright yellowish emission due to an excited-state intramolecular proton transfer (ESIPT) process between the dihydronapthoquinone and benzoyl units. In order to evidence the possibility of an intramolecular coupling of the o-QM intermediate, a synthetic route to the corresponding anthrones is described. Tautomerization of the targeted anthrones occurs and affords highly fluorescent stable hydroxyl-anthraquinones. Although probable to explain the intense visible fluorescence emission also observed in tobacco BY-2 cells used as a cellular model, these coupling products have never been observed during the photochemical reactions performed in this study. Our data suggest that the observed ESIPT-induced fluorescence most likely corresponds to the generation of alkylated products through reduction species, as demonstrated with the β-mercaptoethanol model. In conclusion, F-PDO thus acts as a novel (pro)-fluorescent probe for monitoring redox processes and protein alkylation in living cells.
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Affiliation(s)
- Nathan Trometer
- Team Bio(IN)organic and Medicinal Chemistry, Laboratoire d'Innovation Moléculaire et Applications (LIMA), UMR7042 Université de Strasbourg-CNRS-UHA, European School of Chemistry, Polymers and Materials (ECPM), 25 Rue Becquerel, F-67087 Strasbourg, France
| | - Bogdan Cichocki
- Team Bio(IN)organic and Medicinal Chemistry, Laboratoire d'Innovation Moléculaire et Applications (LIMA), UMR7042 Université de Strasbourg-CNRS-UHA, European School of Chemistry, Polymers and Materials (ECPM), 25 Rue Becquerel, F-67087 Strasbourg, France
| | - Quentin Chevalier
- Institut De Biologie Moléculaire Des Plantes, Unité Propre de Recherche 2357, Centre National de la Recherche Scientifique-Université de Strasbourg, Strasbourg F-67084, France
| | - Jérémy Pécourneau
- Team Bio(IN)organic and Medicinal Chemistry, Laboratoire d'Innovation Moléculaire et Applications (LIMA), UMR7042 Université de Strasbourg-CNRS-UHA, European School of Chemistry, Polymers and Materials (ECPM), 25 Rue Becquerel, F-67087 Strasbourg, France
| | - Jean-Marc Strub
- Laboratoire de Spectrométrie de Masse BioOrganique (LSMBO), UMR7178 Université de Strasbourg-CNRS, IPHC, 25 Rue Becquerel, 67087 Strasbourg, France
| | - Andréa Hemmerlin
- Institut De Biologie Moléculaire Des Plantes, Unité Propre de Recherche 2357, Centre National de la Recherche Scientifique-Université de Strasbourg, Strasbourg F-67084, France
| | - Alexandre Specht
- Conception et Applications des Molécules Bioactives, Faculté de Pharmacie, UMR 7199 CNRS-Université de Strasbourg, 74 Route du Rhin, Illkirch 67401, France
| | - Elisabeth Davioud-Charvet
- Team Bio(IN)organic and Medicinal Chemistry, Laboratoire d'Innovation Moléculaire et Applications (LIMA), UMR7042 Université de Strasbourg-CNRS-UHA, European School of Chemistry, Polymers and Materials (ECPM), 25 Rue Becquerel, F-67087 Strasbourg, France
| | - Mourad Elhabiri
- Team Bio(IN)organic and Medicinal Chemistry, Laboratoire d'Innovation Moléculaire et Applications (LIMA), UMR7042 Université de Strasbourg-CNRS-UHA, European School of Chemistry, Polymers and Materials (ECPM), 25 Rue Becquerel, F-67087 Strasbourg, France
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2
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Dai M, Duan M, Li X, Guo Y, Ma J. Intramolecular Photoredox Reaction Mechanism of Naphthoquinone Compounds: Combined Time-Resolved Spectroscopies and DFT Calculations. J Phys Chem B 2023; 127:710-716. [PMID: 36630686 DOI: 10.1021/acs.jpcb.2c05845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Time-resolved spectroscopies and DFT calculations were utilized to investigate the photoredox mechanisms of naphthoquinone compounds. 5-Methoxy-8-tetrahydropyrane-1,4-naphthoquinone (NQ) and 2-methyl-3-(3-methylbut-2-en-1-yl) 1,4-naphthoquinone (MNQ) were excited to singlet excited species (labeled NQ(S1) and MNQ(S1), respectively). NQ(S1) underwent intersystem crossing to produce a triplet NQ, which further underwent hydrogen atom transfer to form a biradical intermediate. The biradical underwent electron transfer to form a zwitterion, followed by cyclization and proton transfer to generate a photoproduct. MNQ(S1) underwent a 1,4-proton transfer process to produce a quinone methide intermediate (1,3-QM) with zwitterionic character, which tautomerized to 1,2-QM. Then, 1,2-QM underwent electrocyclization. The substituent on the parent naphthoquinone is the key factor leading to the different reaction processes for NQ and MNQ.
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Affiliation(s)
- Mingdong Dai
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Mei Duan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Xuyang Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Yan Guo
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Jiani Ma
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
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Shimizu N, Shigemitsu H, Kida T, Bach T, Mori T. Visible Light-Induced Regio- and Enantiodifferentiating [2 + 2] Photocycloaddition of 1,4-Naphthoquinones Mediated by Oppositely Coordinating 1,3,2-Oxazaborolidine Chiral Lewis Acid. J Org Chem 2022; 87:8071-8083. [PMID: 35652135 DOI: 10.1021/acs.joc.2c00730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A range of asymmetric photochemical transformations using visible light have recently become considerably attractive. Among the various approaches, chiral Lewis acid association to enones for [2 + 2] and ortho photocycloadditions and oxadi-π-methane rearrangements have shown to be very promising. Naturally, chiral Lewis acid coordination protects one of the prochiral faces of the C═C double bond, which enables an effective enantiodifferentiation in the following bond-forming process(es). Here, we studied regio- and enantiodifferentiating [2 + 2] photocycloaddition reactions of naphthoquinone derivatives mediated by chiral oxazaborolidines. A stereochemical control was quite challenging for the 2-ene-1,4-dione substrate, as a double coordination of Lewis acid essentially cancels out the face selectivity, and a mono-coordination to each carbonyl group leads to an opposite stereochemical outcome. Furthermore, a stepwise coordination in the ground state of Lewis acid in a 1:1 fashion was practically inaccessible. We found that the excited-state decomplexation is a key to accomplish high regio- and enantioselectivities in the photocycloaddition of an ene-dione.
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Affiliation(s)
- Nao Shimizu
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hajime Shigemitsu
- Integrated Frontier Research for Medical Science Division Institute for OTRI, Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Toshiyuki Kida
- Integrated Frontier Research for Medical Science Division Institute for OTRI, Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstrasse 4, Garching 85747, Germany
| | - Tadashi Mori
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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4
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Donzel M, Elhabiri M, Davioud-Charvet E. Bioinspired Photoredox Benzylation of Quinones. J Org Chem 2021; 86:10055-10066. [PMID: 34264092 DOI: 10.1021/acs.joc.1c00814] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
3-Benzylmenadiones were obtained in good yield by using a blue-light-induced photoredox process in the presence of Fe(III), oxygen, and γ-terpinene acting as a hydrogen-atom transfer agent. This methodology is compatible with a wide variety of diversely substituted 1,4-naphthoquinones as well as various cheap, readily available benzyl bromides with excellent functional group tolerance. The benzylation mechanism was investigated and supports a three-step radical cascade with the key involvement of the photogenerated superoxide anion radical.
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Affiliation(s)
- Maxime Donzel
- Laboratoire d'Innovation Moléculaire et Applications (LIMA) Team Bio(IN)organic and Medicinal Chemistry, European School of Chemistry, Polymers and Materials (ECPM), Université de Strasbourg-CNRS-UHA UMR7042, 25 Rue Becquerel, Strasbourg 67087, France
| | - Mourad Elhabiri
- Laboratoire d'Innovation Moléculaire et Applications (LIMA) Team Bio(IN)organic and Medicinal Chemistry, European School of Chemistry, Polymers and Materials (ECPM), Université de Strasbourg-CNRS-UHA UMR7042, 25 Rue Becquerel, Strasbourg 67087, France
| | - Elisabeth Davioud-Charvet
- Laboratoire d'Innovation Moléculaire et Applications (LIMA) Team Bio(IN)organic and Medicinal Chemistry, European School of Chemistry, Polymers and Materials (ECPM), Université de Strasbourg-CNRS-UHA UMR7042, 25 Rue Becquerel, Strasbourg 67087, France
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5
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Zhang Z, El-Moghazy AY, Wisuthiphaet N, Nitin N, Castillo D, Murphy BG, Sun G. Daylight-Induced Antibacterial and Antiviral Nanofibrous Membranes Containing Vitamin K Derivatives for Personal Protective Equipment. ACS APPLIED MATERIALS & INTERFACES 2020; 12:49416-49430. [PMID: 33089989 DOI: 10.1021/acsami.0c14883] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
During the development of antibacterial and antiviral materials for personal protective equipment (PPE), daylight active functional polymeric materials containing vitamin K compounds (VKs) and impacts of polymer structures to the functions were investigated. As examples, hydrophobic polyacrylonitrile (PAN) and hydrophilic poly(vinyl alcohol-co-ethylene) (PVA-co-PE) polymers were directly blended with three VK compounds and electrospun into VK-containing nanofibrous membranes (VNFMs). The prepared VNFMs exhibited robust photoactivity in generating reactive oxygen species (ROS) under both daylight (D65, 300-800 nm) and ultraviolet A (UVA, 365 nm) irradiation, resulting in high antimicrobial and antiviral efficiency (>99.9%) within a short exposure time (<90 min). Interestingly, the PVA-co-PE/VK3 VNFM showed higher ROS production rates and better biocidal functions than those of the PAN/VK3 VNFM under the same photoirradiation conditions, indicating that PVA-co-PE is a better matrix polymer material for these functions. Moreover, the prepared PVA-co-PE/VK3 VNFM maintains its powerful microbicidal function even after five times of repeated exposures to bacteria and viruses, showing the stability and reusability of the antimicrobial materials. The fabrication of photoinduced antimicrobial VNFMs may provide new insights into the development of non-toxic and reusable photoinduced antimicrobial materials that could be applied in personal protective equipment with improved biological protections.
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Affiliation(s)
- Zheng Zhang
- Department of Biological and Agricultural Engineering, University of California, Davis, California 95616, United States
| | - Ahmed Y El-Moghazy
- Department of Food Science and Technology, University of California, Davis, California 95616, United States
| | - Nicharee Wisuthiphaet
- Department of Food Science and Technology, University of California, Davis, California 95616, United States
| | - Nitin Nitin
- Department of Biological and Agricultural Engineering, University of California, Davis, California 95616, United States
- Department of Food Science and Technology, University of California, Davis, California 95616, United States
| | - Diego Castillo
- Department of Pathology, Microbiology, and Immunology, University of California, Davis, California 95616, United States
| | - Brian G Murphy
- Department of Pathology, Microbiology, and Immunology, University of California, Davis, California 95616, United States
| | - Gang Sun
- Department of Biological and Agricultural Engineering, University of California, Davis, California 95616, United States
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Mayer M, Pahl M, Spanka M, Grellmann M, Sickert M, Schneider C, Asmis KR, Belder D. Unravelling the configuration of transient ortho-quinone methides by combining microfluidics with gas phase vibrational spectroscopy. Phys Chem Chem Phys 2020; 22:4610-4616. [DOI: 10.1039/c9cp06435d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The alkylidene double bond configuration of transient ortho-quinone methides (o-QMs) is studied by cryogenic ion trap vibrational spectroscopy.
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Affiliation(s)
- Martin Mayer
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - Maik Pahl
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - Matthias Spanka
- Institut für Organische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - Max Grellmann
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - Marcel Sickert
- Institut für Organische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | | | - Knut R. Asmis
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - Detlev Belder
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
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Wang Q, Yu J, Chen X, Du D, Wu R, Qu G, Guo X, Jia H, Wang T. Non-thermal plasma oxidation of Cu(II)-EDTA and simultaneous Cu(II) elimination by chemical precipitation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 248:109237. [PMID: 31310932 DOI: 10.1016/j.jenvman.2019.07.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 06/15/2019] [Accepted: 07/05/2019] [Indexed: 06/10/2023]
Abstract
Cu2+ readily complexes with ethylenediaminetetraacetic acid (EDTA) to form a heavy metal complex (Cu-EDTA) that is typical in the effluents from mining and electroplating industries. It was difficult for the classical alkaline precipitation method to eliminate the heavy metal complex due to the strong bonding ability between Cu(II) and EDTA. Cu(II) release and removal performance after Cu-EDTA decomplexation in a non-thermal plasma oxidation system was carried out in this study. The removal process was characterized by chemical oxygen demand, total organic carbon, atomic force microscopy, and electroconductivity analysis. The toxicity effect of the treated Cu-EDTA solution was also tested by photobacterium bioassay. The experimental results showed that 80.2% of Cu was released and removed within 60 min of the non-thermal plasma treatment/alkaline precipitation. Relatively higher energy input, lower Cu-EDTA concentration, and acidic conditions were necessary to obtain greater Cu release and removal performance, and there existed an appropriate air flow rate for high-efficient Cu release and removal. O2-, OH, 1O2, and O3 were the main active substances leading to Cu2+ release. Its residual toxicity to P.phosphoreum sp.-T3 was significantly reduced after treatment.
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Affiliation(s)
- Qi Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - Jinxian Yu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - XueYao Chen
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - Danting Du
- College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China
| | - Renren Wu
- South China Institute of Environmental Science, MEE, Guangzhou, 510655, PR China; The Key Laboratory of Water and Air Pollution Control of Guangdong Province, China
| | - Guangzhou Qu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - Xuetao Guo
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - Hanzhong Jia
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China
| | - Tiecheng Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, PR China.
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8
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Landry AP, Moon S, Kim H, Yadav PK, Guha A, Cho US, Banerjee R. A Catalytic Trisulfide in Human Sulfide Quinone Oxidoreductase Catalyzes Coenzyme A Persulfide Synthesis and Inhibits Butyrate Oxidation. Cell Chem Biol 2019; 26:1515-1525.e4. [PMID: 31591036 DOI: 10.1016/j.chembiol.2019.09.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/29/2019] [Accepted: 09/17/2019] [Indexed: 01/09/2023]
Abstract
Mitochondrial sulfide quinone oxidoreductase (SQR) catalyzes the oxidation of H2S to glutathione persulfide with concomitant reduction of CoQ10. We report herein that the promiscuous activity of human SQR supported the conversion of CoA to CoA-SSH (CoA-persulfide), a potent inhibitor of butyryl-CoA dehydrogenase, and revealed a molecular link between sulfide and butyrate metabolism, which are known to interact. Three different CoQ1-bound crystal structures furnished insights into how diverse substrates access human SQR, and provided snapshots of the reaction coordinate. Unexpectedly, the active site cysteines in SQR are configured in a bridging trisulfide at the start and end of the catalytic cycle, and the presence of sulfane sulfur was confirmed biochemically. Importantly, our study leads to a mechanistic proposal for human SQR in which sulfide addition to the trisulfide cofactor eliminates 201Cys-SSH, forming an intense charge-transfer complex with flavin adenine dinucleotide, and 379Cys-SSH, which transfers sulfur to an external acceptor.
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Affiliation(s)
- Aaron P Landry
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Sojin Moon
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Hanseong Kim
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Pramod K Yadav
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Arkajit Guha
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Uhn-Soo Cho
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Ruma Banerjee
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
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9
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Tseng MY, Hung HY, Sung K. Electron-Withdrawing β-Substituent, Ring-Strain, and Ortho Effects on Reactivity, Selectivity, and Stability of o-Alkoxybenzyl Carbocations. J Phys Chem A 2015; 119:3905-12. [DOI: 10.1021/acs.jpca.5b02234] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meng-Yun Tseng
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan
| | - Hsin-Yi Hung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan
| | - Kuangsen Sung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan
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11
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Görner H. Reduction of 4,4′-Stilbenequinone and 4,4′-Diphenoquinone upon Reaction with Photogenerated Radicals. Photochem Photobiol 2010; 86:1202-7. [DOI: 10.1111/j.1751-1097.2010.00798.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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12
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Vitamin K analogue as a new fluorescence probe for quantitative antioxidant assay. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.07.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Swartz AM, Patton V, Heppleston MJ, Barra M. On the photoreactivity of vitamin K compounds. INT J CHEM KINET 2008. [DOI: 10.1002/kin.20356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Görner H, von Sonntag C. Photoprocesses of Chloro-Substituted p-Benzoquinones. J Phys Chem A 2008; 112:10257-63. [DOI: 10.1021/jp805046p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Helmut Görner
- Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany
| | - Clemens von Sonntag
- Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany
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15
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Photoreactions of 1,4-naphthoquinone with lysozyme studied by laser flash photolysis and steady-state analysis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2008; 92:77-82. [DOI: 10.1016/j.jphotobiol.2008.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Revised: 05/05/2008] [Accepted: 05/05/2008] [Indexed: 11/17/2022]
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16
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Netto-Ferreira JC, Lhiaubet-Vallet V, Bernardes BO, Ferreira ABB, Miranda MÁ. Characterization, reactivity and photosensitizing properties of the triplet excited state of α-lapachone. Phys Chem Chem Phys 2008; 10:6645-52. [DOI: 10.1039/b810413a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Görner H. Photoreactions of 1,4-Naphthoquinones: Effects of Substituents and Water on the Intermediates and Reactivity¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb00197.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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Görner H. Oxygen Uptake upon Photolysis of 1,4-Benzoquinones and 1,4-Naphthoquinones in Air-Saturated Aqueous Solution in the Presence of Formate, Amines, Ascorbic Acid, and Alcohols. J Phys Chem A 2007; 111:2814-9. [PMID: 17388578 DOI: 10.1021/jp0683061] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effects of oxygen in the photoreduction of 1,4-benzoquinone (BQ), 1,4-naphthoquinone (NQ), and a series of derivatives were studied in aqueous solution in the presence of acetonitrile and formate, aliphatic amines, e.g., EDTA or triethylamine, ascorbic acid, and alcohols, e.g., methanol or 2-propanol. The quinone triplet state is quenched, whereby the semiquinone and donor radicals are formed which react subsequently with oxygen. The overall reaction is oxidation of the donors and conversion of oxygen via the hydroperoxyl/superoxide radical into hydrogen peroxide. The quantum yield (Phi-O2) of this oxygen uptake changes in 2-propanol-water (1:10) from <0.01 for BQ to Phi-O2 = 0.5-0.8 for NQ. Generally Phi-O2 increases with increasing donor concentration. The specific properties of quinone structure, the radical equilibria and reactivity, and the concentration dependences are discussed.
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Affiliation(s)
- Helmut Görner
- Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany
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Görner H. Photoreactions of p-Quinones with Dimethyl Sulfide and Dimethyl Sulfoxide in Aqueous Acetonitrile†. Photochem Photobiol 2006; 82:71-7. [PMID: 16076243 DOI: 10.1562/2005-05-25-ra-540] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The effects of dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO) on the photoreactions of 1,4-benzoquinone (BQ), 1,4-naphthoquinone (NQ), 9,10-anthraquinone (AQ) and several derivatives in acetonitrile/water were studied. The observed triplet state of the quinones is quenched and the rate constant is close to the diffusion-controlled limit for reactions of most quinones with DMS and lower with DMSO. Semiquinone radical anions (Q*-) produced by electron transfer from sulfur to the triplet quinone were detected. For both DMS and DMSO the yield of Q*- is similar, being generally low for BQ and NQ, substantial for AQ and largest for chloranil. The specific quencher concentrations and the effects of quinone structure and redox potentials on the time-resolved photochemical properties are discussed.
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Affiliation(s)
- Helmut Görner
- Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany
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Disney MD, Childs JL, Turner DH. Hoechst 33258 selectively inhibits group I intron self-splicing by affecting RNA folding. Chembiochem 2005; 5:1647-52. [PMID: 15532034 DOI: 10.1002/cbic.200400159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fungal pathogens are increasing in prevalence due to an increase in resistant strains and the number of immunocompromised humans. Candida albicans is one of these pathogens, and approximately 40% of strains contain a group I self-splicing intron, which is a potential RNA drug target, in their large subunit rRNA precursor. Here, we report that Hoechst 33258 and derivatives thereof are selective inhibitors of C. albicans group I intron self-splicing with an IC50 of 17 microM in 2 mM Mg2+. Chemical probing of the intron in the presence of Hoechst 33258 reveals that the folding of several nucleotides in the P4/P6 region of the intron is affected. A nucleotide near the J4/5 region is protected from chemical modification in the presence of Hoechst 33258 and several nearby are more reactive; this suggests that this region is the molecule's binding site. These results expand the available information on small-molecule targeting of RNA and suggest that the RNA-targeting scaffold provided by Hoechst may prove valuable in designing compounds that inhibit the functions of RNA.
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Affiliation(s)
- Matthew D Disney
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216, USA
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Görner H. Photoreactions of 1,4-Naphthoquinones: Effects of Substituents and Water on the Intermediates and Reactivity¶. Photochem Photobiol 2005. [DOI: 10.1562/2004-08-11-ra-270.1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Görner H. Photoreactions of p-benzo-, p-naphtho- and p-anthraquinones with ascorbic acid. Photochem Photobiol Sci 2004; 3:933-8. [PMID: 15480484 DOI: 10.1039/b410386f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoreduction of 1,4-benzoquinone (BQ), 1,4-naphthoquinone (NQ), 9,10-anthraquinone (AQ) and several derivatives, e.g. dimethylBQ, trimethylBQ, duroquinone, bromoNQ, methoxyNQ, methylAQ and dimethylAQ in acetonitrile-water by ascorbate was studied by time-resolved UV-vis spectroscopy using 20 ns laser pulses at 308 nm and continuous 254 nm irradiation. The semiquinone radical (*QH/Q*(-)) is formed after H-atom transfer from ascorbate to the quinone triplet state. The rate constant for quenching is k(q)=(2-9) x 10(9) M(-1) s(-1). Termination of the radicals takes place in the micros-ms range. The results are compared with those initiated by electron transfer from DABCO under similar conditions, where the k(q) values are similar, but the termination of Q*(-) takes place by electron back transfer not yielding hydroquinones. Specific properties of the quinone triplet state, e.g. self-quenching, nucleophilic water addition and the effects of structure are discussed.
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Affiliation(s)
- Helmut Görner
- Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany
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