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Naphthoquinones Oxidize H 2S to Polysulfides and Thiosulfate, Implications for Therapeutic Applications. Int J Mol Sci 2022; 23:ijms232113293. [PMID: 36362080 PMCID: PMC9657496 DOI: 10.3390/ijms232113293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 10/14/2022] [Accepted: 10/21/2022] [Indexed: 11/06/2022] Open
Abstract
1,4-Napththoquinones (NQs) are clinically relevant therapeutics that affect cell function through production of reactive oxygen species (ROS) and formation of adducts with regulatory protein thiols. Reactive sulfur species (RSS) are chemically and biologically similar to ROS and here we examine RSS production by NQ oxidation of hydrogen sulfide (H2S) using RSS-specific fluorophores, liquid chromatography-mass spectrometry, UV-Vis absorption spectrometry, oxygen-sensitive optodes, thiosulfate-specific nanoparticles, HPLC-monobromobimane derivatization, and ion chromatographic assays. We show that NQs, catalytically oxidize H2S to per- and polysulfides (H2Sn, n = 2−6), thiosulfate, sulfite and sulfate in reactions that consume oxygen and are accelerated by superoxide dismutase (SOD) and inhibited by catalase. The approximate efficacy of NQs (in decreasing order) is, 1,4-NQ ≈ juglone ≈ plumbagin > 2-methoxy-1,4-NQ ≈ menadione >> phylloquinone ≈ anthraquinone ≈ menaquinone ≈ lawsone. We propose that the most probable reactions are an initial two-electron oxidation of H2S to S0 and reduction of NQ to NQH2. S0 may react with H2S or elongate H2Sn in variety of reactions. Reoxidation of NQH2 likely involves a semiquinone radical (NQ·−) intermediate via several mechanisms involving oxygen and comproportionation to produce NQ and superoxide. Dismutation of the latter forms hydrogen peroxide which then further oxidizes RSS to sulfoxides. These findings provide the chemical background for novel sulfur-based approaches to naphthoquinone-directed therapies.
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A Rapid Fluorescence Sensor for the Direct Quantification of Rongalite in Foodstuffs. Foods 2022; 11:foods11172650. [PMID: 36076836 PMCID: PMC9455777 DOI: 10.3390/foods11172650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/24/2022] [Accepted: 08/29/2022] [Indexed: 11/17/2022] Open
Abstract
Rongalite was reported illegally used as a food additive for bleaching purposes and improving the tenderness of foodstuffs, which may endanger public health. At present, rongalite was mostly detected by indirect methods via derivatization or determining its decomposition products. In this study, we developed a new fluorescence sensor for the direct quantification of rongalite based on the principles: (1) dopamine reacts with resorcinol and generates strong fluorophore (azamonardine); (2) rongalite could inhibit the production of fluorophores and then result in lower fluorescence intensity. Hence, the rongalite concentration was inversely proportional to fluorescence intensity of fluorophore. Several crucial reaction conditions of fluorescence sensor were further optimized, such as dopamine and resorcinol concentration, pH values, and reaction time. Under the optimal conditions, the limit of detection of fluorescence sensor was 0.28–0.38 μg/g in vermicelli, wheat and rice powder samples, exhibiting almost 3.5-fold improvement compared to that of lateral flow immunoassay. Moreover, the detection time was substantially decreased to 20 min. The recoveries in spiked samples were 80.7–102.1% with a coefficient of variation of less than 12.6%. In summary, we developed a direct, high throughput, selective and accurate fluorescence sensor that poses a promising application for the rapid detection of rongalite in foodstuffs.
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Durant AG, Nicol EA, McInnes BM, Schwan AL. A DFT examination of the role of proximal boron functionalities in the S-alkylation of sulfenic acid anions. Org Biomol Chem 2021; 20:649-657. [PMID: 34942637 DOI: 10.1039/d1ob02083h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Sulfenic acid anions represent an emerging nucleophile for the preparation of sulfoxides. Their S-functionalization chemistry can often be influenced by a nearby group that interacts with the component atoms of the sulfenate through non-bonding interactions. This study uses DFT methods to assess the importance of proximal boron-containing functional groups to direct S-alkylation chemistry of selected sulfenate anions. Several structural variations were modelled at the B3LYP/6-311++G(d,p) level, with the boron species positioned 3 to 5 carbons away from the alkylation site. Transition state free energies of S-alkylation transition states were located with and without sulfenate oxygen precomplexing to the nearby boron atom. The outcomes suggest that an ortho-substituted boronate ester on benzyl bromide can direct and accelerate an alkylation reaction principally due to a reduction of the entropic barrier. It was also determined that an intermolecular precomplex imparts too much stabilization to the sulfenate, thereby reducing its reactivity. The modelling suggests a possible aryl migration of the boronate/sulfenate complex is not competitive with S-alkylation.
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Affiliation(s)
- Andrew G Durant
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2 W1.
| | - Eric A Nicol
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2 W1.
| | - Brandon M McInnes
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2 W1.
| | - Adrian L Schwan
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2 W1.
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Hu J, Xiong Z, Chen X, Wang C, Gong Y. Preparation of Group 3 Metal Sulfur Monoxide Complexes via Oxidation of Metal Atoms using SOF
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in Cryogenic Matrixes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jingwen Hu
- Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 2019 Jialuo Road, Jiading District 201800 Shanghai China
- School of Nuclear Science and Technology University of Chinese Academy of Sciences 100049 Beijing China
| | - Zhixin Xiong
- Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 2019 Jialuo Road, Jiading District 201800 Shanghai China
- School of Nuclear Science and Technology University of Chinese Academy of Sciences 100049 Beijing China
| | - Xiuting Chen
- Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 2019 Jialuo Road, Jiading District 201800 Shanghai China
| | - Chenyang Wang
- Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 2019 Jialuo Road, Jiading District 201800 Shanghai China
| | - Yu Gong
- Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences 2019 Jialuo Road, Jiading District 201800 Shanghai China
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Myszkowska J, Derevenkov I, Makarov SV, Spiekerkoetter U, Hannibal L. Biosynthesis, Quantification and Genetic Diseases of the Smallest Signaling Thiol Metabolite: Hydrogen Sulfide. Antioxidants (Basel) 2021; 10:antiox10071065. [PMID: 34356298 PMCID: PMC8301176 DOI: 10.3390/antiox10071065] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 12/22/2022] Open
Abstract
Hydrogen sulfide (H2S) is a gasotransmitter and the smallest signaling thiol metabolite with important roles in human health. The turnover of H2S in humans is mainly governed by enzymes of sulfur amino acid metabolism and also by the microbiome. As is the case with other small signaling molecules, disease-promoting effects of H2S largely depend on its concentration and compartmentalization. Genetic defects that impair the biogenesis and catabolism of H2S have been described; however, a gap in knowledge remains concerning physiological steady-state concentrations of H2S and their direct clinical implications. The small size and considerable reactivity of H2S renders its quantification in biological samples an experimental challenge. A compilation of methods currently employed to quantify H2S in biological specimens is provided in this review. Substantial discrepancy exists in the concentrations of H2S determined by different techniques. Available methodologies permit end-point measurement of H2S concentration, yet no definitive protocol exists for the continuous, real-time measurement of H2S produced by its enzymatic sources. We present a summary of available animal models, monogenic diseases that impair H2S metabolism in humans including structure-function relationships of pathogenic mutations, and discuss possible approaches to overcome current limitations of study.
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Affiliation(s)
- Joanna Myszkowska
- Laboratory of Clinical Biochemistry and Metabolism, Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany;
| | - Ilia Derevenkov
- Department of Food Chemistry, Ivanovo State University of Chemistry and Technology, 153000 Ivanovo, Russia; (I.D.); (S.V.M.)
| | - Sergei V. Makarov
- Department of Food Chemistry, Ivanovo State University of Chemistry and Technology, 153000 Ivanovo, Russia; (I.D.); (S.V.M.)
| | - Ute Spiekerkoetter
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany;
| | - Luciana Hannibal
- Laboratory of Clinical Biochemistry and Metabolism, Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany;
- Correspondence:
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6
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Olson KR, Gao Y, Briggs A, Devireddy M, Iovino NA, Licursi M, Skora NC, Whelan J, Villa BP, Straub KD. 'Antioxidant' berries, anthocyanins, resveratrol and rosmarinic acid oxidize hydrogen sulfide to polysulfides and thiosulfate: A novel mechanism underlying their biological actions. Free Radic Biol Med 2021; 165:67-78. [PMID: 33508425 DOI: 10.1016/j.freeradbiomed.2021.01.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/03/2021] [Accepted: 01/17/2021] [Indexed: 12/12/2022]
Abstract
Nutraceutical polyphenol catechins in green tea oxidize H2S to polysulfides (PS) in buffer and in cells thereby conveying their cytoprotective effects. Here we measure H2S oxidation in buffer and HEK293 cells by over-the-counter nutraceuticals, blueberry, bilberry and cranberry, and by polyphenols, cyanadin (Cya), quercetin (Que), rosmarinic acid (RA) and resveratrol (Res). H2S and PS were measured with specific fluorophores, AzMc and SSP4 respectively, and thiosulfate (TS) production was measured in buffer using silver nanoparticles (AgNPs). All compounds increased polysulfide production from H2S in buffer and increased polysufides in cells. Decreasing oxygen from 100% to 21% and 0% progressively decreased PS production by Que and RA in buffer and Que decreased PS production in cells incubated in 5% O2 compared to 21% O2. Que, RA and Res, but not Cya, increased TS production from H2S in 21% O2 but not in 0% O2. Superoxide dismutase did not affect PS production from H2S by Que or TS production from H2S by Que, RA or Res, whereas catalase inhibited TS production by all three polyphenols. Conversely, these polyphenols only slightly reduce a mixed polysulfide (K2Sn) or thiosulfate to H2S in 0% O2. Collectively, our results suggest that polyphenols are autoxidized to a semiquinone radical and that this, in turn, oxidizes H2S to a thiyl radical from which polysulfides and thiosulfate derived. They also suggest that this is catalyzed by a semiquinone radical and it is independent of either superoxide or hydrogen peroxide concomitantly produced during polyphenol autoxidation. The polysulfides produced in these reactions are potent antioxidants and also initiate a variety of downstream cytoprotective effector mechanisms. It is also possible that H2S can be regenerated from the thiosulfate produced in these reactions by other cellular reductants and reused in subsequent reactions.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Yan Gao
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA
| | - Austin Briggs
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Monesh Devireddy
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA
| | - Nicholas A Iovino
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Matthew Licursi
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Nicole C Skora
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Jenna Whelan
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Brian P Villa
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR, 72205, USA; Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR, 72202, USA
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Lynch DM, Scanlan EM. Thiyl Radicals: Versatile Reactive Intermediates for Cyclization of Unsaturated Substrates. Molecules 2020; 25:E3094. [PMID: 32646036 PMCID: PMC7412111 DOI: 10.3390/molecules25133094] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 06/30/2020] [Accepted: 07/02/2020] [Indexed: 01/11/2023] Open
Abstract
Sulfur centered radicals are widely employed in chemical synthesis, in particular for alkene and alkyne hydrothiolation towards thioether bioconjugates. The steadfast radical chain process that enables efficient hydrothiolation has been explored in the context of cascade reactions to furnish complex molecular architectures. The use of thiyl radicals offers a much cheaper and less toxic alternative to the archetypal organotin-based radical methods. This review outlines the development of thiyl radicals as reactive intermediates for initiating carbocyclization cascades. Key developments in cascade cyclization methodology are presented and applications for natural product synthesis are discussed. The review provides a chronological account of the field, beginning in the early seventies up to very recent examples; a span of almost 50 years.
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Affiliation(s)
| | - Eoin M. Scanlan
- School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland;
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Ni S, Bai FY, Pan XM. Atmospheric chemistry of thiourea: nucleation with urea and roles in NO2 hydrolysis. Phys Chem Chem Phys 2020; 22:8109-8117. [DOI: 10.1039/c9cp04300d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nucleation with urea and roles in NO2 hydrolysis in the presence of thiourea.
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Affiliation(s)
- Shuang Ni
- Institute of Functional Material Chemistry
- National & Local United Engineering Lab for Power Battery
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
| | - Feng-Yang Bai
- Institute of Catalysis for Energy and Environment
- College of Chemistry and Chemical Engineering
- Shenyang Normal University
- Shenyang
- People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry
- National & Local United Engineering Lab for Power Battery
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
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9
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Chatterjee D. Chemistry of Ru(edta) complexes relevant to oxidoreductase mimicking: a personal perspective. NEW J CHEM 2020. [DOI: 10.1039/d0nj04349d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article chronicles the enzyme mimicking chemistry of Ru(edta) complexes (edta4− = ethylenediaminetetraacetate) in regard to small molecule activation.
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Affiliation(s)
- Debabrata Chatterjee
- Vice-Chancellor's Research Group at Zoology Department
- University of Burdwan
- Burdwan
- India
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10
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Dereven’kov IA, Makarov SV. Catalytic effect of tetrasulfonated cobalt phthalocyanine on selenite reduction by dithionite. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01687-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Characterization of Polysulfides, Polysulfanes, and Other Unique Species in the Reaction between GSNO and H 2S. Molecules 2019; 24:molecules24173090. [PMID: 31454893 PMCID: PMC6749520 DOI: 10.3390/molecules24173090] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/19/2019] [Accepted: 08/20/2019] [Indexed: 12/17/2022] Open
Abstract
Glutathione-based products, GSnX, of the reaction of hydrogen sulfide, H2S, S-nitroso glutathione, and GSNO, at varied stoichiometries have been analyzed by liquid chromatography high-resolution mass spectrometry (LC-HRMS) and chemical trapping experiments. A wide variety of glutathione-based species with catenated sulfur chains have been identified including sulfanes (GSSnG), sulfides (GSSnH), and sulfenic acids (GSnOH); sulfinic (GSnO2H) and sulfonic (GSnO3H) acids are also seen in reactions exposed to air. The presence of each species of GSnX within the original reaction mixtures was confirmed using Single Ion Chromatograms (SICs), to demonstrate the separation on the LC column, and given approximate quantification by the peak area of the SIC. Further, confirmation for different GSnX families was obtained by trapping with species-specific reagents. Several unique GSnX families have been characterized, including bridging mixed di- and tetra-valent polysulfanes and internal trithionitrates (GSNHSnH) with polysulfane branches. Competitive trapping experiments suggest that the polysulfane chains are formed via the intermediacy of sulfenic acid species, GSSnOH. In the presence of radical trap vinylcyclopropane (VCP) the relative distributions of polysulfane speciation are relatively unaffected, suggesting that radical coupling is not a dominant pathway. Therefore, we suggest polysulfane catenation occurs via reaction of sulfides with sulfenic acids.
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