1
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Jörges M, Gremillion AJ, Knyszek D, Kelley SP, Walensky JR, Gessner VH. From a mercury(II) bis(yldiide) complex to actinide yldiides. Chem Commun (Camb) 2024; 60:3190-3193. [PMID: 38415283 DOI: 10.1039/d3cc05553a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The bis(yldiide) mercury complex, (L-Hg-L) [L = C(PPh3)P(S)Ph2], is prepared from the corresponding potassium yldiide and used to access the first substituted yldiide actinide complexes [(C5Me5)2An(L)(Cl)] (An = U, Th) via salt metathesis. Compared to previously reported phosphinocarbene complexes, the complexes exhibit long actinide-carbon distances, which can be explained by the strong polarization of the π-electron density toward carbon.
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Affiliation(s)
- Mike Jörges
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Alexander J Gremillion
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Daniel Knyszek
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Steven P Kelley
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
| | - Justin R Walensky
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
| | - Viktoria H Gessner
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
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2
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Li D, Han X, Li Y. Mechanism of methylmercury photodegradation in the yellow sea and East China Sea: Dominant pathways, and role of sunlight spectrum and dissolved organic matter. WATER RESEARCH 2024; 251:121112. [PMID: 38198975 DOI: 10.1016/j.watres.2024.121112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 12/31/2023] [Accepted: 01/05/2024] [Indexed: 01/12/2024]
Abstract
Mercury (Hg) is among the most concerned contaminants in the world due to its high toxicity, prevalent existence in the environments, and bioaccumulation via food chain. Methylmercury (MeHg) is the major form of Hg that accumulates along the food chain and poses threat to humans and wild life. Photodegradation is the dominant process that MeHg is eliminated from freshwater system and upper ocean. The formation of MeHg-dissolved organic matter (DOM) complexes and a variety of free radicals (FR)/reactive oxygen species (ROS) have been previously proposed to be involved in MeHg photodegradation. However, most of these studies were conducted in freshwater, and the mechanism of MeHg photodegradation in seawater remains unclear. In this study, the main pathways of MeHg photodegradation in the seawater of Yellow Sea (YS) and East China Sea (ECS) were investigated using FR/ ROS scavenger addition and DOM competing-ligand addition techniques. The results showed that direct photodegradation of MeHg-DOM complexes is the major pathway of MeHg photodegradation in the YS and ECS, while indirect photolysis of MeHg by hydroxyl radical (·OH) also plays a certain role at some sites. MeHg photodegradation was found to be mainly induced by ultraviolet (UV) light rather than visible light in YS and ECS seawater, and the contribution of UV-B was higher than UV-A which was opposite to that previously reported in freshwater. The energy for breaking the bond of CHg in MeHg-Cl complexes formed in seawater is higher than that in MeHg-DOM complexes and this may cause the relatively greater contribution of UV-B with higher energy to MeHg photodegradation in seawater. In addition, MeHg photodegradation in various fractions of natural DOM with different molecular weights, hydrophilicity/hydrophobicity and acid-base was tested. MeHg photodegradation rates (kd) varied in these fractions and kd in high molecular weight DOM and hydrophobic Acid (HOA) fractions were faster than that in the other fractions. A significantly positive correlation was observed between kd and thiol concentrations while there was no significant correlation between kd and other measured parameters representing the composition of DOM (specific UV absorbance at 254 nm (SUVA254), spectral slope (SR), chromophoric dissolved organic matter (CDOM), humification index (HIX), biological index (BIX) and fluorescent components). These results indicate that thiol may be the key functional group in DOM affecting the photodegradation of MeHg in the YS and ECS.
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Affiliation(s)
- Dan Li
- Weifang University, Weifang 261061, China
| | - Xiaoxiao Han
- Shandong Institute for Food and Drug Control, Jinan 250000, China
| | - Yanbin Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
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3
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Stinson I, Li HH, Tsui MTK, Ku P, Ulus Y, Cheng Z, Lam HM. Tree foliage as a net accumulator of highly toxic methylmercury. Sci Rep 2024; 14:1757. [PMID: 38242950 PMCID: PMC10799008 DOI: 10.1038/s41598-024-51469-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 01/05/2024] [Indexed: 01/21/2024] Open
Abstract
Tree canopies are known to elevate atmospheric inputs of both mercury (Hg) and methylmercury (MeHg). While foliar uptake of gaseous Hg is well documented, little is known regarding the temporal dynamics and origins of MeHg in tree foliage, which represents typically less than 1% of total Hg in foliage. In this work, we examined the foliar total Hg and MeHg content by following the growth of five individual trees of American Beech (Fagus grandifolia) for one growing season (April-November, 2017) in North Carolina, USA. We show that similar to other studies foliar Hg content increased almost linearly over time, with daily accumulation rates ranging from 0.123 to 0.161 ng/g/day. However, not all trees showed linear increases of foliar MeHg content along the growing season; we found that 2 out of 5 trees showed elevated foliar MeHg content at the initial phase of the growing season but their MeHg content declined through early summer. However, foliar MeHg content among all 5 trees showed eventual increases through the end of the growing season, proving that foliage is a net accumulator of MeHg while foliar gain of biomass did not "dilute" MeHg content.
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Affiliation(s)
- Idus Stinson
- Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, 27402, USA
| | - Han-Han Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China.
| | - Martin Tsz-Ki Tsui
- Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, 27402, USA.
- School of Life Sciences, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
| | - Peijia Ku
- Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, 27402, USA
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Yener Ulus
- Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, 27402, USA
- Department of Environmental Studies, Davidson College, Davidson, NC, 28035, USA
| | - Zhang Cheng
- College of Environment, Sichuan Agricultural University, Chengdu, 611130, China
| | - Hon-Ming Lam
- School of Life Sciences, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
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4
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Zhang L, Song Y, Li Y, Yin Y, Cai Y. Role of light in methylmercury photodegradation: From irradiation to absorption in the presence of organic ligands. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 848:157550. [PMID: 35907539 DOI: 10.1016/j.scitotenv.2022.157550] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/07/2022] [Accepted: 07/18/2022] [Indexed: 06/15/2023]
Abstract
Photochemical degradation acts as the principal sink for methylmercury (MeHg) in surface water, which is regulated by light and solution matrix (especially the presence of dissolved organic matter, DOM). The spectral composition of light irradiation and the light absorption properties of reaction media (often exerted by DOM) are important in MeHg photodegradation, which has not yet been clearly resolved. Aiming to understand the role of light in MeHg photodegradation from the perspectives of both light irradiation and absorption, we investigated the photodegradation of MeHg under different simulated sunlight sources, with and without DOM model compounds of different molecular structures. The results show that the photodegradation of MeHg under different sunlight irradiation yields distinct first-order date constant, mainly due to the slight difference in UVB composition. The degradation of MeHg without DOM under a light source with high intensity in the UV region and no MeHg degradation under the UV-filtered light even in the presence of DOM showed the importance of UV lights in MeHg photodegradation. The use of ultrapure water as a reaction medium may be subject to MeHg loss through vessel adsorption, not just photolysis. Additionally, this work found that the type and position of coexisting substituents on aromatic thiols play a critical role in improving the photodegradation of MeHg, following amino > hydroxyl > carboxyl, para > meta > ortho. Based on the characterization of ultraviolet-visible absorption spectra and our previous work, it was concluded that the presence of DOM could induce red-shift in light absorption and reduce the electronic transition energy of the CHg bond, facilitating MeHg photodegradation. The structures of DOM affect the light absorption properties, which are related to MeHg photodegradation.
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Affiliation(s)
- Lian Zhang
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Yue Song
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yongguang Yin
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yong Cai
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, United States
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5
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Barona Duque K, Gaviria D. Modelamiento in silico de la liasa organomercurial (MerB) de Pseudomonas fluorescens. REVISTA COLOMBIANA DE QUÍMICA 2022. [DOI: 10.15446/rev.colomb.quim.v51n1.98381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
El modelamiento in silico ha sido de gran contribución en los procesos proteómicos, desarrollando estructuras de las secuencias proteicas ya existentes, que por motivos de altos costos y las diferentes tecnologías necesarias para el desarrollo de estas metodologías, se encuentran deficientes en el número de modelamientos de proteínas disponibles. Entre aquellas secuencias con carencia de estructura proteica se encuentra la proteína liasa organomercurial (MerB) de Pseudomonas fluorescens, importante en la resistencia al mercurio. En el presente artículo se analizó tanto estructural como funcionalmente la proteína MerB en Pseudomonas fluorescens, utilizando la herramienta de la química estructural “modelamiento por homología” mediante plataformas bioinformáticas, con el fin de obtener un modelo que represente la estructura 3D más precisa y que capturen las mejores variantes estructurales entre todas las posibles conformaciones de las proteínas en la familia. En este trabajo, se desarrolló un método comparativo de la secuencia estudiada con las reportadas en las bases de datos para las proteínas MerB del género Pseudomonas. Se propone un modelo tridimensional para la enzima (MerB) en P. fluorescens, mediante el modelamiento por homología, se muestra la caracterización en la estructura secundaria, terciaria, la caracterización del dominio catalítico y los motivos estructurales presentes.
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6
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Rajendran K, Dey R, Ghosh A, Das D. In search of biocatalytic remedy for organotin compounds- the recalcitrant eco-toxicants. Biophys Chem 2022; 290:106888. [DOI: 10.1016/j.bpc.2022.106888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/08/2022] [Accepted: 08/29/2022] [Indexed: 11/25/2022]
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7
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Kumar Rai R, Shankar Pati R, Islam A, Roy G. Detoxification of organomercurials by thiones and selones: A short review. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Li Y, Li D, Song B, Li Y. The potential of mercury methylation and demethylation by 15 species of marine microalgae. WATER RESEARCH 2022; 215:118266. [PMID: 35290869 DOI: 10.1016/j.watres.2022.118266] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 02/12/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Mercury (Hg) and its compounds are a kind of worldwide concerned persistent toxic pollutants. As the major primary producer in the ocean, microalgae are expected to play an important role in the cycling and accumulation of Hg in marine ecosystems by either uptake Hg species from seawater or involving in the transformations of Hg species. However, there is still lack of clear knowledge on whether microalgae can induce the methylation and demethylation of Hg in aquatic environments. In this study, Hg isotope dilution and isotope addition techniques were utilized to determine the methylation and demethylation potential of Hg at concentrations comparable to that in natural environments by 15 common marine microalgae (8 species of Diatoms, 4 species of Dinoflagellates, 2 species of Chlorophyta and 1 species of Chrysophyte). Methylation of inorganic Hg was found to be negligible in the culture of all tested marine microalgae, while 6 species could significantly induce the demethylation of methylmercury (MeHg). The rates of microalgae mediated MeHg demethylation were at the same order of magnitude as that of photodemethylation, indicating that marine microalgae may play an important role in the degradation of MeHg in marine environments. Further studies suggest that the demethylation of MeHg by the microalgae may be mainly caused by their extracellular secretions (via photo-induce demethylation) and associated bacteria, rather than the direct demethylation of MeHg by microalgae cells. In addition, it was found that thiol groups may be the major component in microalgal extracellular secretions that lead to the photo-demethylation of MeHg.
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Affiliation(s)
- Ying Li
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Dan Li
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Beibei Song
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yanbin Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
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9
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Yu RQ, Barkay T. Microbial mercury transformations: Molecules, functions and organisms. ADVANCES IN APPLIED MICROBIOLOGY 2022; 118:31-90. [PMID: 35461663 DOI: 10.1016/bs.aambs.2022.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Mercury (Hg) methylation, methylmercury (MeHg) demethylation, and inorganic redox transformations of Hg are microbe-mediating processes that determine the fate and cycling of Hg and MeHg in many environments, and by doing so influence the health of humans and wild life. The discovery of the Hg methylation genes, hgcAB, in the last decade together with advances in high throughput and genome sequencing methods, have resulted in an expanded appreciation of the diversity of Hg methylating microbes. This review aims to describe experimentally confirmed and recently discovered hgcAB gene-carrying Hg methylating microbes; phylogenetic and taxonomic analyses are presented. In addition, the current knowledge on transformation mechanisms, the organisms that carry them out, and the impact of environmental parameters on Hg methylation, MeHg demethylation, and inorganic Hg reduction and oxidation is summarized. This knowledge provides a foundation for future action toward mitigating the impact of environmental Hg pollution.
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Affiliation(s)
- Ri-Qing Yu
- Department of Biology, University of Texas at Tyler, Tyler, TX, United States.
| | - Tamar Barkay
- Department of Biochemistry and Microbiology, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States
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10
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Barkay T, Gu B. Demethylation─The Other Side of the Mercury Methylation Coin: A Critical Review. ACS ENVIRONMENTAL AU 2022; 2:77-97. [PMID: 37101582 PMCID: PMC10114901 DOI: 10.1021/acsenvironau.1c00022] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The public and environmental health consequences of mercury (Hg) methylation have drawn much attention and considerable research to Hg methylation processes and their dynamics in diverse environments and under a multitude of conditions. However, the net methylmercury (MeHg) concentration that accumulates in the environment is equally determined by the rate of MeHg degradation, a complex process mediated by a variety of biotic and abiotic mechanisms, about which our knowledge is limited. Here we review the current knowledge on MeHg degradation and its potential pathways and mechanisms. We describe detoxification by resistant microorganisms that employ the Hg resistance (mer) system to reductively break the carbon-mercury (C-Hg) bond producing methane (CH4) and inorganic mercuric Hg(II), which is then reduced by the mercuric reductase to elemental Hg(0). Very recent research has begun to elucidate a mechanism for the long-recognized mer-independent oxidative demethylation, likely involving some strains of anaerobic bacteria as well as aerobic methane-oxidizing bacteria, i.e., methanotrophs. In addition, photochemical and chemical demethylation processes are described, including the roles of dissolved organic matter (DOM) and free radicals as well as dark abiotic demethylation in the natural environment about which little is currently known. We focus on mechanisms and processes of demethylation and highlight the uncertainties and known effects of environmental factors leading to MeHg degradation. Finally, we suggest future research directions to further elucidate the chemical and biochemical mechanisms of biotic and abiotic demethylation and their significance in controlling net MeHg production in natural ecosystems.
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Affiliation(s)
- Tamar Barkay
- Department of Biochemistry and Microbiology, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey 08901, United States
| | - Baohua Gu
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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11
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Sambade D, Collins C, Parkin G. Structure and Bonding of 1,2,4-Triazole Thiones Derived from Nitron. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Manceau A, Bourdineaud JP, Oliveira RB, Sarrazin SLF, Krabbenhoft DP, Eagles-Smith CA, Ackerman JT, Stewart AR, Ward-Deitrich C, Del Castillo Busto ME, Goenaga-Infante H, Wack A, Retegan M, Detlefs B, Glatzel P, Bustamante P, Nagy KL, Poulin BA. Demethylation of Methylmercury in Bird, Fish, and Earthworm. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1527-1534. [PMID: 33476127 DOI: 10.1021/acs.est.0c04948] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Toxicity of methylmercury (MeHg) to wildlife and humans results from its binding to cysteine residues of proteins, forming MeHg-cysteinate (MeHgCys) complexes that hinder biological functions. MeHgCys complexes can be detoxified in vivo, yet how this occurs is unknown. We report that MeHgCys complexes are transformed into selenocysteinate [Hg(Sec)4] complexes in multiple animals from two phyla (a waterbird, freshwater fish, and earthworms) sampled in different geographical areas and contaminated by different Hg sources. In addition, high energy-resolution X-ray absorption spectroscopy (HR-XANES) and chromatography-inductively coupled plasma mass spectrometry of the waterbird liver support the binding of Hg(Sec)4 to selenoprotein P and biomineralization of Hg(Sec)4 to chemically inert nanoparticulate mercury selenide (HgSe). The results provide a foundation for understanding mercury detoxification in higher organisms and suggest that the identified MeHgCys to Hg(Sec)4 demethylation pathway is common in nature.
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Affiliation(s)
- Alain Manceau
- Université Grenoble Alpes, ISTerre, CNRS, Grenoble 38000, France
| | - Jean-Paul Bourdineaud
- Université de Bordeaux, Institut Européen de Chimie et Biologie, CNRS, Pessac 33600, France
| | - Ricardo B Oliveira
- Universidade Federal do Oeste Pará, LabBBEx, Santarém 68180-000, Pará, Brazil
| | - Sandra L F Sarrazin
- Universidade Federal do Oeste Pará, LabBBEx, Santarém 68180-000, Pará, Brazil
| | - David P Krabbenhoft
- Upper Midwest Water Science Center, U.S. Geological Survey, Middleton 53562, Wisconsin, United States
| | - Collin A Eagles-Smith
- Forest and Rangeland Ecosystem Science Center, U.S. Geological Survey, Corvallis 97330, Oregon, United States
| | - Joshua T Ackerman
- Western Ecological Research Center, U.S. Geological Survey, Dixon Field Station, Dixon 95620, California, United States
| | - A Robin Stewart
- U.S. Geological Survey, Water Resources Mission Area, Menlo Park 94025, California, United States
| | | | | | | | - Aude Wack
- Université Grenoble Alpes, ISTerre, CNRS, Grenoble 38000, France
| | - Marius Retegan
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Blanka Detlefs
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Pieter Glatzel
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Paco Bustamante
- Université La Rochelle, CNRS, Littoral Environnement et Sociétés, La Rochelle 17000, France
| | - Kathryn L Nagy
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago 60607, Illinois, United States
| | - Brett A Poulin
- U.S. Geological Survey, Water Resources Mission Area, Boulder 80303, Colorado, United States
- Department of Environmental Toxicology, University of California Davis, Davis 95616, California, United States
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13
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Wang P, Li LZ, Qin YL, Liang ZL, Li XT, Yin HQ, Liu LJ, Liu SJ, Jiang CY. Comparative Genomic Analysis Reveals the Metabolism and Evolution of the Thermophilic Archaeal Genus Metallosphaera. Front Microbiol 2020; 11:1192. [PMID: 32655516 PMCID: PMC7325606 DOI: 10.3389/fmicb.2020.01192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 05/11/2020] [Indexed: 01/15/2023] Open
Abstract
Members of the genus Metallosphaera are widely found in sulfur-rich and metal-laden environments, but their physiological and ecological roles remain poorly understood. Here, we sequenced Metallosphaera tengchongensis Ric-A, a strain isolated from the Tengchong hot spring in Yunnan Province, China, and performed a comparative genome analysis with other Metallosphaera genomes. The genome of M. tengchongensis had an average nucleotide identity (ANI) of approximately 70% to that of Metallosphaera cuprina. Genes sqr, tth, sir, tqo, hdr, tst, soe, and sdo associated with sulfur oxidation, and gene clusters fox and cbs involved in iron oxidation existed in all Metallosphaera genomes. However, the adenosine-5'-phosphosulfate (APS) pathway was only detected in Metallosphaera sedula and Metallosphaera yellowstonensis, and several subunits of fox cluster were lost in M. cuprina. The complete 3-hydroxypropionate/4-hydroxybutyrate cycle and dicarboxylate/4-hydroxybutyrate cycle involved in carbon fixation were found in all Metallosphaera genomes. A large number of gene family gain events occurred in M. yellowstonensis and M. sedula, whereas gene family loss events occurred frequently in M. cuprina. Pervasive strong purifying selection was found acting on the gene families of Metallosphaera, of which transcription-related genes underwent the strongest purifying selection. In contrast, genes related to prophages, transposons, and defense mechanisms were under weaker purifying pressure. Taken together, this study expands knowledge of the genomic traits of Metallosphaera species and sheds light on their evolution.
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Affiliation(s)
- Pei Wang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Liang Zhi Li
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Ya Ling Qin
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zong Lin Liang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xiu Tong Li
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Hua Qun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Li Jun Liu
- Department of Pathogen Biology, School of Basic Medical Science, Xi’an Medical University, Xi’an, China
| | - Shuang-Jiang Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Cheng-Ying Jiang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
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14
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Karri R, Das R, Rai RK, Gopalakrishnan A, Roy G. Hg-C bond protonolysis by a functional model of bacterial enzyme organomercurial lyase MerB. Chem Commun (Camb) 2020; 56:9280-9283. [PMID: 32558833 DOI: 10.1039/d0cc02232b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report a novel synthetic compound 1, having a highly nucleophilic selenolate (Se-) moiety and a thiol (-SH) functional group, which showed efficient Hg-C bond protonolysis of various R-Hg-X molecules including neurotoxic methylmercury and thimerosal, via direct -SH proton transfer to the highly activated C-atom of a departed R group with low activation energy barrier at room temperature (21 °C), in the absence of any external proton source and, thus, acts as a functional model of MerB.
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Affiliation(s)
- Ramesh Karri
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, UP 201314, India
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15
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Chalana A, Karri R, Mandal SC, Pathak B, Roy G. Chemical Degradation of Mercury Alkyls Mediated by Copper Selenide Nanosheets. Chem Asian J 2019; 14:4582-4587. [DOI: 10.1002/asia.201901077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/19/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Ashish Chalana
- Department of ChemistrySchool of Natural SciencesShiv Nadar University NH91 Dadri, Gautam Buddha Nagar UP 201314 India
| | - Ramesh Karri
- Department of ChemistrySchool of Natural SciencesShiv Nadar University NH91 Dadri, Gautam Buddha Nagar UP 201314 India
| | - Shyama Charan Mandal
- Department of ChemistryInstitute of Technology (IIT) Indore (India), Discipline of Metallurgy Engineering and Material Science, Indian Institute of Technology (IIT) Indore India
| | - Biswarup Pathak
- Department of ChemistryInstitute of Technology (IIT) Indore (India), Discipline of Metallurgy Engineering and Material Science, Indian Institute of Technology (IIT) Indore India
| | - Gouriprasanna Roy
- Department of ChemistrySchool of Natural SciencesShiv Nadar University NH91 Dadri, Gautam Buddha Nagar UP 201314 India
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16
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Karri R, Chalana A, Kumar B, Jayadev SK, Roy G. Exploiting the κ 2 -Fashioned Coordination of [Se 2 ]-Donor Ligand L 3 Se for Facile Hg-C Bond Cleavage of Mercury Alkyls and Cytoprotection against Methylmercury-Induced Toxicity. Chemistry 2019; 25:12810-12819. [PMID: 31298434 DOI: 10.1002/chem.201902578] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/09/2019] [Indexed: 11/10/2022]
Abstract
The Hg-C bond of MeHgCl, a ubiquitous environmental toxicant, is notoriously inert and exceedingly difficult to cleave. The cleavage of the Hg-C bond of MeHgCl at low temperature, therefore, is of significant importance for human health. Among various bis(imidazole)-2-selones Ln Se (n=1-4, or 6), the three-spacer L3 Se shows extraordinarily high reactivity in the degradation of various mercury alkyls including MeHgCl because of its unique ability to coordinate through κ2 -fashion, in which both the Se atoms simultaneously attack the Hg center of mercury alkyls for facile Hg-C bond cleavage. It has the highest softness (σ) parameter and the lowest HOMO(Ln Se)-LUMO(MeHgX) energy gap and, thus, L3 Se is the most reactive among Ln Se towards MeHgX (X=Cl or I). L3 Se is highly efficient, more than L1 Se, in restoring the activity of antioxidant enzyme glutathione reductase (GR) that is completely inhibited by MeHgCl; 80 % GR activity is recovered by L3 Se relative to 50 % by L1 Se. It shows an excellent cytoprotective effect in liver cells against MeHgCl-induced oxidative stress by protecting vital antioxidant enzymes from inhibition caused by MeHgCl and, thus, does not allow to increase the intracellular reactive oxygen species (ROS) levels. Furthermore, it protects the mitochondrial membrane potential (ΔΨm ) from perturbation by MeHgCl. Major Hg-responsive genes analyses demonstrate that L3 Se plays a significant role in MeHg+ detoxification in liver cells.
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Affiliation(s)
- Ramesh Karri
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Greater Noida, UP, 201314, India
| | - Ashish Chalana
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Greater Noida, UP, 201314, India
| | - Binayak Kumar
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Greater Noida, UP, 201314, India
| | - Sri Krishna Jayadev
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Greater Noida, UP, 201314, India
| | - Gouriprasanna Roy
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Greater Noida, UP, 201314, India
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17
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The influence of co-anions on the structural dimension of mercury (II) coordination polymers: Synthesis, crystal structure, spectroscopy and biological activity investigations. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.118978] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Quinlivan PJ, Chaijan MR, Palmer JH, Shlian DG, Parkin G. Coordination of 1-methyl-1,3-dihydro-2 H-benzimidazole-2-selone to zinc and cadmium: Monotonic and non-monotonic bond length variations for [H(sebenzim Me)] 2MCl 2 complexes (M = Zn, Cd, Hg). Polyhedron 2019; 164:185-194. [PMID: 31333278 PMCID: PMC6644719 DOI: 10.1016/j.poly.2019.01.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of 1-methyl-1,3-dihydro-2H-benzimidazole-2-selone, H(sebenzimMe), towards the zinc and cadmium halides, MX2 (M = Zn, Cd; X = Cl, Br, I), afford the adducts, [H(sebenzimMe)]2MX2, which have been structurally characterized by X-ray diffraction. The halide ligands of each of these complexes participate in hydrogen bonding interactions with the imidazole N-H moieties, although the nature of the interactions depends on the halide. Specifically, the chloride and bromide derivatives, [H(sebenzimMe)]2ZnX2 and [H(sebenzimMe)]2CdX2 (X = Cl, Br), exhibit two intramolecular N-H•••X interactions, whereas the iodide derivatives, [H(sebenzimMe)]2ZnI2 and [H(sebenzimMe)]2CdI2, exhibit only one intramolecular N-H•••I interaction. Comparison of the M-Se and M-Cl bond lengths of the chloride series, [H(sebenzimMe)]2MCl2 (M = Zn, Cd, Hg), indicates that while the average M-Cl bond lengths progressively increase as the metal becomes heavier, the variation in M-Se bond length exhibits a non-monotonic trend, with the Cd-Se bond being the longest. These different trends provide an interesting subtlety concerned with use of covalent radii in predicting bond length differences. In addition to tetrahedral [H(sebenzimMe)]2CdCl2, [H(sebenzimMe)]3,CdCl2•[H(sebenzim)Me]4CdCl2, which features both five-coordinate and six-coordinate coordinate centers, has also been structurally characterized. Finally, the reaction between CdI2 and H(sebenzimMe) at elevated temperatures affords the 1-methylbenzimidazole complex, [H(sebenzimMe)]-[H(benzimMe)]CdI2, a transformation that is associated with cleavage of the C-Se bond.
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Affiliation(s)
| | | | - Joshua H Palmer
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Daniel G Shlian
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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19
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Synthesis, structural and mass spectrometric investigations of pyridinium bis(thiosalicylato)mercurate(II). Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Takanezawa Y, Nakamura R, Matsuda H, Yagi T, Egawa Z, Sone Y, Uraguchi S, Adachi T, Kiyono M. Intracellular Demethylation of Methylmercury to Inorganic Mercury by Organomercurial Lyase (MerB) Strengthens Cytotoxicity. Toxicol Sci 2019; 170:438-451. [DOI: 10.1093/toxsci/kfz094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Abstract
Some methylmercury (MeHg) is converted to inorganic mercury (Hg2+) after incorporation into human and animal tissues, where it can remain for a long time. To determine the overall toxicity of MeHg in tissues, studies should evaluate low concentrations of Hg2+. Although demethylation is involved, the participating enzymes or underlying mechanisms are unknown; in addition, the low cell membrane permeability of Hg2+ makes these analyses challenging. We established model cell lines to assess toxicities of low concentrations of Hg2+ using bacterial organomercury lyase (MerB). We engineered MerB-expressing HEK293 and HeLa cell lines that catalyze MeHg demethylation. These cells were significantly more sensitive to MeHg exposure compared to the parental cells. MeHg treatment remarkably induced metallothioneins (MTs) and hemeoxygenase-1 (HMOX-1) mRNAs and modest expression of superoxide dismutase 1, whereas catalase and glutathione peroxidase 1 mRNAs were not up-regulated. merB knockdown using small interfering RNA supported the induction of MT and HMOX-1 mRNA by MerB enzymatic activity. Pretreatment with Trolox, a water-soluble vitamin E analog, did not inhibit MeHg-induced elevation of MT-Ix and HMOX-1 mRNAs in MerB-expressing cells, suggesting that Hg2+ works independently of reactive oxygen species generation. Similar results were obtained in cells expressing MerB, suggesting that high MTs and HMOX-1 induction and cytotoxicity are common cellular responses to low intracellular Hg2+ concentrations. This is the first study to establish cell lines that demethylate intracellular MeHg to Hg2+ using bacterial MerB for overcoming the low membrane permeability of Hg2+ and exploring the intracellular responses and toxicities of low Hg2+ concentrations.
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Affiliation(s)
- Yasukazu Takanezawa
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Ryosuke Nakamura
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Haruki Matsuda
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Tomomi Yagi
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Zen Egawa
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Yuka Sone
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Shimpei Uraguchi
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
| | - Tatsumi Adachi
- Faculty of Pharmacy, Chiba Institute of Science, Choshi, Chiba 288-0025, Japan
| | - Masako Kiyono
- Department of Public Health, School of Pharmacy, Kitasato University, Minato-ku, Tokyo 108-8641
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21
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Taherzadeh M, Pourayoubi M, Nečas M. The first X-ray crystal structure of a mercury(II) complex with an SP(N)3-based ligand: Synthesis and crystal structure of SP(NC5H10)3 and [Hg{SP(NC5H10)3}Cl2]2. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1487427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Maryam Taherzadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mehrdad Pourayoubi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Marek Nečas
- Department of Chemistry, Masaryk University, Brno, Czech Republic
- CEITEC - Central European Institute of Technology, Masaryk University, Brno, Czech Republic
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22
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Karri R, Chalana A, Das R, Rai RK, Roy G. Cytoprotective effects of imidazole-based [S 1] and [S 2]-donor ligands against mercury toxicity: a bioinorganic approach. Metallomics 2019; 11:213-225. [PMID: 30488926 DOI: 10.1039/c8mt00237a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we report the coordination behaviour of an imidazole-based [S1]-donor ligand, 1,3-dimethyl-imidazole-2(3H)-thione (L1), and [S2]-donor ligand, 3,3'-methylenebis(1-methyl-imidazole-2(3H)-thione) (L2) or 4,4'-(3,3'-methylenebis-(2-thioxo-2,3-dihydro-imidazole-3,1-diyl))dibutanoic acid (L3), with HgX2 (X = Cl, Br or I) in solution and the solid state. NMR, UV-Vis spectroscopic, and single crystal X-ray studies demonstrated that L1 or L2 coordinated rapidly and reversibly to the mercury center of HgX2 through the thione moiety. Treatment of L2 with HgCl2 or HgBr2 afforded 16-membered metallacycle k1-(L2)2Hg2Cl4 or k1-(L2)2Hg2Br4 where two Cl or Br atoms are located inside the ring. In contrast, treatment of L2 with HgI2 afforded a chain-like structure of k1-[L2Hgl2]n, possibly due to the large size of the iodine atom. Interestingly, [S1] and [S2]-donor ligands (L1, L2, and L3) showed an excellent efficacy to protect liver cells against HgCl2 induced toxicity and the strength of their efficacy is in the order of L3 > L2 > L1. 30% decrease of ROS production was observed when liver cells were co-treated with HgCl2 and L1 in comparison to those cells treated with HgCl2 only. In contrast, 45% and 60% decrease of ROS production was observed in the case of cells co-treated with HgCl2 and thiones L2 and L3, respectively, indicating that [S2]-donor ligands L2 and L3 have better cytoprotective effects against oxidative stress induced by HgCl2 than [S1]-donor ligand L1. Water-soluble ligand L3 with N-(CH2)3CO2H substituents showed a better cytoprotective effect against HgCl2 toxicity than L2 in liver cells.
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Affiliation(s)
- Ramesh Karri
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, UP 201314, India.
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23
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Zhang X, Li Y, Feng G, Tai C, Yin Y, Cai Y, Liu J. Probing the DOM-mediated photodegradation of methylmercury by using organic ligands with different molecular structures as the DOM model. WATER RESEARCH 2018; 138:264-271. [PMID: 29609155 DOI: 10.1016/j.watres.2018.03.055] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/22/2018] [Accepted: 03/23/2018] [Indexed: 06/08/2023]
Abstract
Photodegradation is the main depletion pathway for methylmercury (MeHg) in surface water. The formation of MeHg-dissolved organic matter (DOM) complexes has been found to be a key step in MeHg photodegradation. However, the major functional groups involved in the DOM-mediated process have yet to be clearly resolved. In this work, we systematically investigated the effects of DOM molecular structures on MeHg photodegradation by using a variety of organic ligands with different functional groups (e.g., thiosalicylate, thiophenol, and thioaniline). The results showed that thiol and phenyl groups may be the major functional groups governing DOM-mediated MeHg photodegradation, with photodegradation rates also dependent on the type (carboxyl, hydroxyl, and amino group) and position (ortho-, meta-, and para-) of other chemical substituents. The addition of "non-photochemically active" thiol ligands (e.g., mercaptoethanol and dithiothreitol) and high concentrations of Cl- can significantly inhibit the o-thiosalicylate-induced MeHg photodegradation, indicating that complexation of MeHg with these ligands is necessary for MeHg photodegradation. Sparging with O2 had a negligible effect on MeHg photodegradation, while sparging with N2 significantly enhanced MeHg photodegradation. This finding suggests that MeHg photodegradation may be a reductive process, which was further supported by identification of the degradation products of MeHg. A possible protonolysis mechanism of MeHg photodegradation in the presence of o-thiosalicylate was then proposed based on the findings of this study.
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Affiliation(s)
- Xiaoyan Zhang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
| | - Gang Feng
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Chao Tai
- Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China
| | - Yongguang Yin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Yong Cai
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Jingfu Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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24
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Misson L, Burn R, Vit A, Hildesheim J, Beliaeva MA, Blankenfeldt W, Seebeck FP. Inhibition and Regulation of the Ergothioneine Biosynthetic Methyltransferase EgtD. ACS Chem Biol 2018; 13:1333-1342. [PMID: 29658702 DOI: 10.1021/acschembio.8b00127] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ergothioneine is an emerging factor in cellular redox homeostasis in bacteria, fungi, plants, and animals. Reports that ergothioneine biosynthesis may be important for the pathogenicity of bacteria and fungi raise the question as to how this pathway is regulated and whether the corresponding enzymes may be therapeutic targets. The first step in ergothioneine biosynthesis is catalyzed by the methyltransferase EgtD that converts histidine into N-α-trimethylhistidine. This report examines the kinetic, thermodynamic and structural basis for substrate, product, and inhibitor binding by EgtD from Mycobacterium smegmatis. This study reveals an unprecedented substrate binding mechanism and a fine-tuned affinity landscape as determinants for product specificity and product inhibition. Both properties are evolved features that optimize the function of EgtD in the context of cellular ergothioneine production. On the basis of these findings, we developed a series of simple histidine derivatives that inhibit methyltransferase activity at low micromolar concentrations. Crystal structures of inhibited complexes validate this structure- and mechanism-based design strategy.
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Affiliation(s)
- Laëtitia Misson
- Department for Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, Basel, Switzerland
| | - Reto Burn
- Department for Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, Basel, Switzerland
| | - Allegra Vit
- Structure and Function of Proteins, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124, Braunschweig, Germany
| | - Julia Hildesheim
- Department for Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, Basel, Switzerland
| | - Mariia A. Beliaeva
- Department for Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, Basel, Switzerland
| | - Wulf Blankenfeldt
- Structure and Function of Proteins, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124, Braunschweig, Germany
- Institute for Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Florian P. Seebeck
- Department for Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, Basel, Switzerland
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25
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Sone Y, Uraguchi S, Takanezawa Y, Nakamura R, Pan-Hou H, Kiyono M. Cysteine and histidine residues are involved in Escherichia coli Tn 21 MerE methylmercury transport. FEBS Open Bio 2017; 7:1994-1999. [PMID: 29226085 PMCID: PMC5715351 DOI: 10.1002/2211-5463.12341] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/05/2017] [Accepted: 10/24/2017] [Indexed: 11/29/2022] Open
Abstract
Bacterial resistance to mercury compounds (mercurials) is mediated by proteins encoded by mercury resistance (mer) operons. Six merE variants with site‐directed mutations were constructed to investigate the roles of the cysteine and histidine residues in MerE protein during mercurial transport. By comparison of mercurial uptake by the cell with intact and/or variant MerE, we showed that the cysteine pair in the first transmembrane domain was critical for the transport of both Hg(II) and CH3Hg(I). Also, the histidine residue located near to the cysteine pair was critical for Hg(II) transport, whereas the histidine residue located on the periplasmic side was critical for CH3Hg(I) transport. Thus, enhanced mercurial uptake mediated by MerE may be a promising strategy for the design of new biomass for use in the bioremediation of mercurials in the environment.
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Affiliation(s)
- Yuka Sone
- Department of Public Health School of Pharmacy Kitasato University Tokyo Japan
| | - Shimpei Uraguchi
- Department of Public Health School of Pharmacy Kitasato University Tokyo Japan
| | - Yasukazu Takanezawa
- Department of Public Health School of Pharmacy Kitasato University Tokyo Japan
| | - Ryosuke Nakamura
- Department of Public Health School of Pharmacy Kitasato University Tokyo Japan
| | | | - Masako Kiyono
- Department of Public Health School of Pharmacy Kitasato University Tokyo Japan
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26
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Karri R, Banerjee M, Chalana A, Jha KK, Roy G. Activation of the Hg–C Bond of Methylmercury by [S2]-Donor Ligands. Inorg Chem 2017; 56:12102-12115. [DOI: 10.1021/acs.inorgchem.7b01048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Ramesh Karri
- Department of Chemistry, School of Natural
Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Mainak Banerjee
- Department of Chemistry, School of Natural
Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Ashish Chalana
- Department of Chemistry, School of Natural
Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Kunal Kumar Jha
- Department of Chemistry, School of Natural
Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Gouriprasanna Roy
- Department of Chemistry, School of Natural
Sciences, Shiv Nadar University, NH91, Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
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27
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Palmgren M, Engström K, Hallström BM, Wahlberg K, Søndergaard DA, Säll T, Vahter M, Broberg K. AS3MT-mediated tolerance to arsenic evolved by multiple independent horizontal gene transfers from bacteria to eukaryotes. PLoS One 2017; 12:e0175422. [PMID: 28426741 PMCID: PMC5398495 DOI: 10.1371/journal.pone.0175422] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 03/24/2017] [Indexed: 12/14/2022] Open
Abstract
Organisms have evolved the ability to tolerate toxic substances in their environments, often by producing metabolic enzymes that efficiently detoxify the toxicant. Inorganic arsenic is one of the most toxic and carcinogenic substances in the environment, but many organisms, including humans, metabolise inorganic arsenic to less toxic metabolites. This multistep process produces mono-, di-, and trimethylated arsenic metabolites, which the organism excretes. In humans, arsenite methyltransferase (AS3MT) appears to be the main metabolic enzyme that methylates arsenic. In this study, we examined the evolutionary origin of AS3MT and assessed the ability of different genotypes to produce methylated arsenic metabolites. Phylogenetic analysis suggests that multiple, independent horizontal gene transfers between different bacteria, and from bacteria to eukaryotes, increased tolerance to environmental arsenic during evolution. These findings are supported by the observation that genetic variation in AS3MT correlates with the capacity to methylate arsenic. Adaptation to arsenic thus serves as a model for how organisms evolve to survive under toxic conditions.
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Affiliation(s)
- Michael Palmgren
- Unit of Metals & Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
- Centre for Membrane Pumps in Cells and Disease—PUMPKIN, Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - Karin Engström
- Unit of Metals & Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
- Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | - Björn M. Hallström
- Science for Life Laboratory, KTH—Royal Institute of Technology, Stockholm, Sweden
| | - Karin Wahlberg
- Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | | | - Torbjörn Säll
- Department of Biology, Lund University, Lund, Sweden
| | - Marie Vahter
- Unit of Metals & Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Karin Broberg
- Unit of Metals & Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
- * E-mail:
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28
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Kreider-Mueller A, Quinlivan PJ, Owen JS, Parkin G. Tris(2-mercaptoimidazolyl)hydroborato Cadmium Thiolate Complexes, [Tm But]CdSAr: Thiolate Exchange at Cadmium in a Sulfur-Rich Coordination Environment. Inorg Chem 2017; 56:4644-4654. [PMID: 28368611 PMCID: PMC5461919 DOI: 10.1021/acs.inorgchem.7b00296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Indexed: 11/30/2022]
Abstract
A series of cadmium thiolate compounds that feature a sulfur-rich coordination environment, namely [TmBut]CdSAr, have been synthesized by the reactions of [TmBut]CdMe with ArSH (Ar = C6H4-4-F, C6H4-4-But, C6H4-4-OMe, and C6H4-3-OMe). In addition, the pyridine-2-thiolate and pyridine-2-selenolate derivatives, [TmBut]CdSPy and [TmBut]CdSePy have been obtained via the respective reactions of [TmBut]CdMe with pyridine-2-thione and pyridine-2-selone. The molecular structures of [TmBut]CdSAr and [TmBut]CdEPy (E = S or Se) have been determined by X-ray diffraction and demonstrate that, in each case, the [CdS4] motif is distorted tetrahedral and approaches a trigonal monopyramidal geometry in which the thiolate ligand adopts an equatorial position; [TmBut]CdSPy and [TmBut]CdSePy, however, exhibit an additional long-range interaction with the pyridyl nitrogen atoms. The ability of the thiolate ligands to participate in exchange was probed by 1H and 19F nuclear magnetic resonance (NMR) spectroscopic studies of the reactions of [TmBut]CdSC6H4-4-F with ArSH (Ar = C6H4-4-But or C6H4-4-OMe), which demonstrate that (i) exchange is facile and (ii) coordination of thiolate to cadmium is most favored for the p-fluorophenyl derivative. Furthermore, a two-dimensional EXSY experiment involving [TmBut]CdSC6H4-4-F and 4-fluorothiophenol demonstrates that degenerate thiolate ligand exchange is also facile on the NMR time scale.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jonathan S. Owen
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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29
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Banerjee M, Karri R, Chalana A, Das R, Rai RK, Rawat KS, Pathak B, Roy G. Protection of Endogenous Thiols against Methylmercury with Benzimidazole-Based Thione by Unusual Ligand-Exchange Reactions. Chemistry 2017; 23:5696-5707. [DOI: 10.1002/chem.201605238] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Mainak Banerjee
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
| | - Ramesh Karri
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
| | - Ashish Chalana
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
| | - Ranajit Das
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
| | - Rakesh Kumar Rai
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
| | - Kuber Singh Rawat
- Discipline of Chemistry and Discipline of Metallurgy Engineering and Materials Science; Indian Institute of Technology (IIT) Indore; Indore, MP 453552 India
| | - Biswarup Pathak
- Discipline of Chemistry and Discipline of Metallurgy Engineering and Materials Science; Indian Institute of Technology (IIT) Indore; Indore, MP 453552 India
| | - Gouriprasanna Roy
- Department of Chemistry; School of Natural Sciences; Shiv Nadar University, NH91, Dadri; Gautam Buddha Nagar, UP 201314 India
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30
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Zhang D, Yin Y, Li Y, Cai Y, Liu J. Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 578:535-541. [PMID: 27839761 DOI: 10.1016/j.scitotenv.2016.10.222] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 10/29/2016] [Accepted: 10/30/2016] [Indexed: 06/06/2023]
Abstract
Photodegradation is the main depletion pathway of methylmercury (MeHg) in surface water. However, the underlying mechanism of MeHg photodegradation is still not well understood. In this study, the critical role of natural organic matter (NOM) from Suwannee River natural organic matter of the International Humic Substance Society, especially its molecular weight, and the impacts of other related environmental factors in MeHg photodegradation were investigated. We observed that MeHg cannot photo-degrade in de-ionized water, excluding the direct photodegradation of MeHg. While either NOM or Fe3+ alone induced MeHg photodegradation, co-existing NOM significantly inhibited the Fe3+-induced degradation, highlighting the critical and complex role of NOM in MeHg photodegradation. Additionally, MeHg exhibited different photodegradation rates in the presence of molecular weight fractionated natural organic matter (Mf-NOM). More importantly, high concentration of NOM caused light attenuation significantly inhibited the photodegradation of MeHg, which was more significant for high molecular weight Mf-NOM. In the presence of Mf-NOM, MeHg photodegradation was also affected by light quality, pH and co-existing Cl- and NO3-. The study is helpful for a better understanding of the critical role of NOM and other environmental factors on MeHg photodegradation in surface water.
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Affiliation(s)
- Dan Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongguang Yin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Yong Cai
- Institute of Environment and Health, Jianghan University, Wuhan 430056, China
| | - Jingfu Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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31
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Wahba HM, Lecoq L, Stevenson M, Mansour A, Cappadocia L, Lafrance-Vanasse J, Wilkinson KJ, Sygusch J, Wilcox DE, Omichinski JG. Structural and Biochemical Characterization of a Copper-Binding Mutant of the Organomercurial Lyase MerB: Insight into the Key Role of the Active Site Aspartic Acid in Hg-Carbon Bond Cleavage and Metal Binding Specificity. Biochemistry 2016; 55:1070-81. [PMID: 26820485 DOI: 10.1021/acs.biochem.5b01298] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In bacterial resistance to mercury, the organomercurial lyase (MerB) plays a key role in the detoxification pathway through its ability to cleave Hg-carbon bonds. Two cysteines (C96 and C159; Escherichia coli MerB numbering) and an aspartic acid (D99) have been identified as the key catalytic residues, and these three residues are conserved in all but four known MerB variants, where the aspartic acid is replaced with a serine. To understand the role of the active site serine, we characterized the structure and metal binding properties of an E. coli MerB mutant with a serine substituted for D99 (MerB D99S) as well as one of the native MerB variants containing a serine residue in the active site (Bacillus megaterium MerB2). Surprisingly, the MerB D99S protein copurified with a bound metal that was determined to be Cu(II) from UV-vis absorption, inductively coupled plasma mass spectrometry, nuclear magnetic resonance, and electron paramagnetic resonance studies. X-ray structural studies revealed that the Cu(II) is bound to the active site cysteine residues of MerB D99S, but that it is displaced following the addition of either an organomercurial substrate or an ionic mercury product. In contrast, the B. megaterium MerB2 protein does not copurify with copper, but the structure of the B. megaterium MerB2-Hg complex is highly similar to the structure of the MerB D99S-Hg complexes. These results demonstrate that the active site aspartic acid is crucial for both the enzymatic activity and metal binding specificity of MerB proteins and suggest a possible functional relationship between MerB and its only known structural homologue, the copper-binding protein NosL.
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Affiliation(s)
- Haytham M Wahba
- Faculty of Pharmacy, Beni-suef University , Beni-suef, Egypt
| | | | - Michael Stevenson
- Department of Chemistry, Dartmouth College , Hanover, New Hampshire 03755, United States
| | | | | | | | | | | | - Dean E Wilcox
- Department of Chemistry, Dartmouth College , Hanover, New Hampshire 03755, United States
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32
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Rahaman SA, Roy B, Mandal S, Bandyopadhyay S. A Kamikaze Approach for Capturing Hg2+ Ions through the Formation of a One-Dimensional Metal–Organometallic Polymer. Inorg Chem 2016; 55:1069-75. [PMID: 26784576 DOI: 10.1021/acs.inorgchem.5b02104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Sk. Atiur Rahaman
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata Mohanpur, Nadia, West Bengal 741246, India
| | - Biswajit Roy
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata Mohanpur, Nadia, West Bengal 741246, India
| | - Soumik Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata Mohanpur, Nadia, West Bengal 741246, India
| | - Subhajit Bandyopadhyay
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata Mohanpur, Nadia, West Bengal 741246, India
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33
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Yurkerwich K, Quinlivan PJ, Rong Y, Parkin G. Phenylselenolate Mercury Alkyl Compounds, PhSeHgMe and PhSeHgEt: Molecular Structures, Protolytic Hg-C Bond Cleavage and Phenylselenolate Exchange. Polyhedron 2016; 103:307-314. [PMID: 26644634 PMCID: PMC4669890 DOI: 10.1016/j.poly.2015.06.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The phenylselenolate mercury alkyl compounds, PhSeHgMe and PhSeHgEt, have been structurally characterized by X-ray diffraction, thereby demonstrating that both compounds are monomeric with approximately linear coordination geometries; the mercury centers do, nevertheless, exhibit secondary Hg•••Se intermolecular interactions that serve to increase the coordination number in the solid state. The ethyl derivative, PhSeHgEt, undergoes facile protolytic cleavage of the Hg-C bond to release ethane at room temperature, whereas PhSeHgMe exhibits little reactivity under similar conditions. Interestingly, the cleavage of the Hg-C bond of PhSeHgEt is also more facile than that of the thiolate analogue, PhSHgEt, which demonstrates that coordination by selenium promotes protolytic cleavage of the mercury-carbon bond. The phenylselenolate compounds PhSeHgR (R = Me, Et) also undergo degenerate exchange reactions with, for example, PhSHgR and RHgCl. In each case, the alkyl groups preserve coupling to the 199Hg nuclei, thereby indicating that the exchange process involves metathesis of the Hg-SePh/Hg-X groups rather than metathesis of the Hg-R/Hg-R groups.
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Affiliation(s)
- Kevin Yurkerwich
- Department of Chemistry, Columbia University, New York New York 10027,
USA
| | | | - Yi Rong
- Department of Chemistry, Columbia University, New York New York 10027,
USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York New York 10027,
USA
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34
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Casas JS, Couce MD, García-Vega M, Sánchez A, Sordo J, Vázquez López EM. Phenylmercury( ii) sulfanylpropenoates: an example of symmetrization with the 3-(2-methoxyphenyl)-2-sulfanylpropenoato ligand. NEW J CHEM 2016. [DOI: 10.1039/c6nj00624h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Some new phenylmercury(ii) sulfanylpropenoate complexes were prepared and characterized. The identification of diphenylmercury(ii) reveals the existence of a symmetrization process, which was followed in solution by NMR.
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Affiliation(s)
- José S. Casas
- Departamento de Química Inorgánica
- Facultade de Farmacia
- Universidade de Santiago de Compostela
- Galicia
- Spain
| | - María D. Couce
- Instituto de Investigación Biomédica
- Departamento de Química Inorgánica
- Facultade de Química
- Universidade de Vigo
- Galicia
| | - Manuel García-Vega
- Departamento de Química Inorgánica
- Facultade de Farmacia
- Universidade de Santiago de Compostela
- Galicia
- Spain
| | - Agustín Sánchez
- Departamento de Química Inorgánica
- Facultade de Farmacia
- Universidade de Santiago de Compostela
- Galicia
- Spain
| | - José Sordo
- Departamento de Química Inorgánica
- Facultade de Farmacia
- Universidade de Santiago de Compostela
- Galicia
- Spain
| | - Ezequiel M. Vázquez López
- Instituto de Investigación Biomédica
- Departamento de Química Inorgánica
- Facultade de Química
- Universidade de Vigo
- Galicia
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35
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Montazerozohori M, Masoudiasl A, Doert T, Seykens H. Structural and computational study of some new nano-structured Hg(ii) compounds: a combined X-ray, Hirshfeld surface and NBO analyses. RSC Adv 2016. [DOI: 10.1039/c5ra22899a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Crystal structure, Hirshfeld surface, DFT and NBO analyses of two new distorted square-pyramidal mercury complexes are presented.
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Affiliation(s)
| | - A. Masoudiasl
- Department of Chemistry
- Yasouj University
- Yasouj 7591874831
- Iran
| | - Th. Doert
- Department of Chemistry and Food Chemistry
- Technische Universität Dresden
- 01062 Dresden
- Germany
| | - H. Seykens
- Department of Chemistry
- University of Antwerp
- 2020 Antwerpen
- Belgium
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36
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Kreider-Mueller A, Quinlivan PJ, Rauch M, Owen JS, Parkin G. Synthesis, structure and reactivity of [TmBut]ZnH, a monomeric terminal zinc hydride compound in a sulfur-rich coordination environment: access to a heterobimetallic compound. Chem Commun (Camb) 2016; 52:2358-61. [DOI: 10.1039/c5cc08915h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The zinc hydride complex, [TmBut]ZnH, undergoes insertion of CO2 and facile protolytic cleavage, of which the latter provides access to heterobimetallic [TmBut]ZnMo(CO)3Cp.
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Affiliation(s)
| | | | - Michael Rauch
- Department of Chemistry
- Columbia University
- New York
- USA
| | | | - Gerard Parkin
- Department of Chemistry
- Columbia University
- New York
- USA
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37
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Kreider-Mueller A, Quinlivan PJ, Rong Y, Owen JS, Parkin G. Exchange of Alkyl and Tris(2-mercapto-1- t-butylimidazolyl)hydroborato Ligands Between Zinc, Cadmium and Mercury. J Organomet Chem 2015; 792:177-183. [PMID: 26273109 DOI: 10.1016/j.jorganchem.2015.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The tris(2-mercaptoimidazolyl)hydroborato ligand, [TmBut ], has been used to investigate the exchange of alkyl and sulfur donor ligands between the Group 12 metals, Zn, Cd and Hg. For example, [TmBut ]2Zn reacts with Me2Zn to yield [TmBut ]ZnMe, while [TmBut ]CdMe is obtained readily upon reaction of [TmBut ]2Cd with Me2Cd. Ligand exchange is also observed between different metal centers. For example, [TmBut ]CdMe reacts with Me2Zn to afford [TmBut ]ZnMe and Me2Cd. Likewise, [TmBut ]HgMe reacts with Me2Zn to afford [TmBut ]ZnMe and Me2Hg. However, whereas the [TmBut ] ligand transfers from mercury to zinc in the methyl system, [TmBut ]HgMe/Me2Zn, transfer of the [TmBut ] ligand from zinc to mercury is observed upon treatment of [TmBut ]2Zn with HgI2 to afford [TmBut ]HgI and [TmBut ]ZnI. These observations demonstrate that the phenomenological preference for the [TmBut ] ligand to bind one metal rather than another is strongly influenced by the nature of the co-ligands.
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Affiliation(s)
| | | | - Yi Rong
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Jonathan S Owen
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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38
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Banerjee M, Karri R, Rawat KS, Muthuvel K, Pathak B, Roy G. Chemical Detoxification of Organomercurials. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201504413] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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39
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Banerjee M, Karri R, Rawat KS, Muthuvel K, Pathak B, Roy G. Chemical Detoxification of Organomercurials. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504413] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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40
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Monsieurs P, Hobman J, Vandenbussche G, Mergeay M, Van Houdt R. Response of Cupriavidus metallidurans CH34 to Metals. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/978-3-319-20594-6_3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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41
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Kreider-Mueller A, Quinlivan PJ, Owen JS, Parkin G. Synthesis and structures of cadmium carboxylate and thiocarboxylate compounds with a sulfur-rich coordination environment: carboxylate exchange kinetics involving tris(2-mercapto-1-t-butylimidazolyl)hydroborato cadmium complexes, [Tm(Bu(t))]Cd(O2CR). Inorg Chem 2015; 54:3835-50. [PMID: 25826184 PMCID: PMC4415050 DOI: 10.1021/acs.inorgchem.5b00017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Indexed: 11/28/2022]
Abstract
A series of cadmium carboxylate compounds in a sulfur-rich environment provided by the tris(2-tert-butylmercaptoimidazolyl)hydroborato ligand, namely, [Tm(Bu(t))]CdO2CR, has been synthesized via the reactions of the cadmium methyl derivative [Tm(Bu(t))]CdMe with RCO2H. Such compounds mimic aspects of cadmium-substituted zinc enzymes and also the surface atoms of cadmium chalcogenide crystals, and have therefore been employed to model relevant ligand exchange processes. Significantly, both (1)H and (19)F NMR spectroscopy demonstrate that the exchange of carboxylate groups between [Tm(Bu(t))]Cd(κ(2)-O2CR) and the carboxylic acid RCO2H is facile on the NMR time scale, even at low temperature. Analysis of the rate of exchange as a function of concentration of RCO2H indicates that reaction occurs via an associative rather than dissociative pathway. In addition to carboxylate compounds, the thiocarboxylate derivative [Tm(Bu(t))]Cd[κ(1)-SC(O)Ph] has also been synthesized via the reaction of [Tm(Bu(t))]CdMe with thiobenzoic acid. The molecular structure of [Tm(Bu(t))]Cd[κ(1)-SC(O)Ph] has been determined by X-ray diffraction, and an interesting feature is that, in contrast to the carboxylate derivatives [Tm(Bu(t))]Cd(κ(2)-O2CR), the thiocarboxylate ligand binds in a κ(1) manner via only the sulfur atom.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Jonathan S. Owen
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Gerard Parkin
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
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42
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Palmer J, Parkin G. Protolytic cleavage of Hg-C bonds induced by 1-methyl-1,3-dihydro-2H-benzimidazole-2-selone: synthesis and structural characterization of mercury complexes. J Am Chem Soc 2015; 137:4503-16. [PMID: 25822075 PMCID: PMC4415037 DOI: 10.1021/jacs.5b00840] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Indexed: 12/22/2022]
Abstract
Multinuclear ((1)H, (77)Se, and (199)Hg) NMR spectroscopy demonstrates that 1-methyl-1,3-dihydro-2H-benzimidazole-2-selone, H(sebenzim(Me)), a structural analogue of the selenoamino acid, selenoneine, binds rapidly and reversibly to the mercury centers of HgX2 (X = Cl, Br, I), while X-ray diffraction studies provide evidence for the existence of adducts of composition [H(sebenzim(Me))]xHgX2 (X = Cl, x = 2, 3, 4; X = I, x = 2) in the solid state. H(sebenzim(Me)) also reacts with methylmercury halides, but the reaction is accompanied by elimination of methane resulting from protolytic cleavage of the Hg-C bond, an observation that is of relevance to the report that selenoneine demethylates CysHgMe, thereby providing a mechanism for mercury detoxification. Interestingly, the structures of [H(sebenzim(Me))]xHgX2 exhibit a variety of different hydrogen bonding patterns resulting from the ability of the N-H groups to form hydrogen bonds with chlorine, iodine, and selenium.
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Affiliation(s)
- Joshua
H. Palmer
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
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43
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Okuniewski A, Rosiak D, Chojnacki J, Becker B. Coordination polymers and molecular structures among complexes of mercury(II) halides with selected 1-benzoylthioureas. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.01.035] [Citation(s) in RCA: 294] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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44
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Schlebusch CM, Gattepaille LM, Engström K, Vahter M, Jakobsson M, Broberg K. Human adaptation to arsenic-rich environments. Mol Biol Evol 2015; 32:1544-55. [PMID: 25739736 DOI: 10.1093/molbev/msv046] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Adaptation drives genomic changes; however, evidence of specific adaptations in humans remains limited. We found that inhabitants of the northern Argentinean Andes, an arid region where elevated arsenic concentrations in available drinking water is common, have unique arsenic metabolism, with efficient methylation and excretion of the major metabolite dimethylated arsenic and a less excretion of the highly toxic monomethylated metabolite. We genotyped women from this population for 4,301,332 single nucleotide polymorphisms (SNPs) and found a strong association between the AS3MT (arsenic [+3 oxidation state] methyltransferase) gene and mono- and dimethylated arsenic in urine, suggesting that AS3MT functions as the major gene for arsenic metabolism in humans. We found strong genetic differentiation around AS3MT in the Argentinean Andes population, compared with a highly related Peruvian population (FST = 0.014) from a region with much less environmental arsenic. Also, 13 of the 100 SNPs with the highest genome-wide Locus-Specific Branch Length occurred near AS3MT. In addition, our examination of extended haplotype homozygosity indicated a selective sweep of the Argentinean Andes population, in contrast to Peruvian and Colombian populations. Our data show that adaptation to tolerate the environmental stressor arsenic has likely driven an increase in the frequencies of protective variants of AS3MT, providing the first evidence of human adaptation to a toxic chemical.
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Affiliation(s)
- Carina M Schlebusch
- Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden
| | - Lucie M Gattepaille
- Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden
| | - Karin Engström
- Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | - Marie Vahter
- Unit of Metals and Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Mattias Jakobsson
- Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Karin Broberg
- Unit of Metals and Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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45
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Palmer JH, Parkin G. Influence of Benzannulation on Metal Coordination Geometries: Synthesis and Structural Characterization of Tris(2-mercapto-1-methylbenzimidazolyl)hydroborato Cadmium Bromide, {[Tm MeBenz]Cd(μ-Br)} 2.. J Mol Struct 2015; 1081:530-535. [PMID: 25601793 PMCID: PMC4296741 DOI: 10.1016/j.molstruc.2014.10.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium complex, {[TmMeBenz]Cd(μ-Br)}2, may be synthesized via the reaction of [TmMeBenz]K with CdBr2. X-ray diffraction demonstrates that {[TmMeBenz]Cd(μ-Br)}2 exists as a dimer, which is in marked contrast to the monomeric structure of the non-benzannulated counterpart, [TmMe]CdBr, and thereby demonstrates that benzannulation of tris(2-mercapto-1-methylbenzimidazolyl)hydroborato ligands can have a distinct impact on the molecular structure of their metal complexes. In accord with this observation, density functional theory calculations indicate that the benzannulated dimers, {[TmMeBenz]Cd(μ-X)}2 (X = Cl, Br, I), are more stable with respect to dissociation than are their non-benzannulated counterparts, {[TmMe]Cd(μ-X)}2. Furthermore, the calculations also indicate that the stability of the dimer depends on the nature of X, such that the dimer becomes more stable in the sequence I < Br < Cl.
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Affiliation(s)
- Joshua H Palmer
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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46
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Palmer JH, Parkin G. Synthesis and structural characterization of tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium halide complexes, {[Tm(MeBenz)]Cd(μ-Cl)}2 and [Tm(MeBenz)]CdI: a rare example of cadmium in a trigonal bipyramidal sulfur-rich coordination environment. Dalton Trans 2014; 43:13874-82. [PMID: 25105778 PMCID: PMC4262141 DOI: 10.1039/c4dt01820f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium complexes, {[Tm(MeBenz)]Cd(μ-Cl)}2 and [Tm(MeBenz)]CdI, have been synthesized via the reactions of [Tm(MeBenz)]K with CdCl2 and CdI2, respectively. While X-ray diffraction studies demonstrate that the iodide derivative, [Tm(MeBenz)]CdI, is a monomer, the chloride derivative, {[Tm(MeBenz)]Cd(μ-Cl)}2, exists as a dimer, which is unprecedented for Group 12 [Tm(R)]MX (X = Cl, Br, I) compounds. Furthermore, the cadmium centers of {[Tm(MeBenz)]Cd(μ-Cl)}2 are trigonal bipyramidal, which is an uncommon motif for cadmium complexes with a [S3Cl2] coordination sphere.
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Affiliation(s)
- Joshua H Palmer
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
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Kaur G, Subramanian S. Repurposing TRASH: emergence of the enzyme organomercurial lyase from a non-catalytic zinc finger scaffold. J Struct Biol 2014; 188:16-21. [PMID: 25220669 DOI: 10.1016/j.jsb.2014.09.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 08/28/2014] [Accepted: 09/03/2014] [Indexed: 11/26/2022]
Abstract
The mercury resistance pathway enzyme organomercurial lyase (MerB) catalyzes the conversion of organomercurials to ionic mercury (Hg(2+)). Here, we provide evidence for the emergence of this enzyme from a TRASH-like, non-enzymatic, treble-clef zinc finger ancestor by domain duplication and fusion. Surprisingly, the structure-stabilizing metal-binding core of the treble-clef appears to have been repurposed in evolution to serve a catalytic role. Novel enzymatic functions are believed to have evolved from ancestral generalist catalytic scaffolds or from already specialized enzymes with catalytic promiscuity. The emergence of MerB from a zinc finger ancestor serves as a rare example of how a novel enzyme may emerge from a non-catalytic scaffold with a related binding function.
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Affiliation(s)
- Gurmeet Kaur
- CSIR-Institute of Microbial Technology, Sector 39A, Chandigarh, India
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Rajasekharan-Nair R, Moore D, Kennedy AR, Reglinski J, Spicer MD. The Stability of Mercaptobenzothiazole Based Soft Scorpionate Complexes. Inorg Chem 2014; 53:10276-82. [DOI: 10.1021/ic5013236] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Rajeev Rajasekharan-Nair
- Department of Pure and Applied
Chemistry, WestChem University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Dean Moore
- Department of Pure and Applied
Chemistry, WestChem University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Alan R. Kennedy
- Department of Pure and Applied
Chemistry, WestChem University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - John Reglinski
- Department of Pure and Applied
Chemistry, WestChem University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Mark D. Spicer
- Department of Pure and Applied
Chemistry, WestChem University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
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Palmer JH, Parkin G. Synthesis and Structural Characterization of 1-Arylimidazole-2-thiones and N, N'-Aryldiethoxyethylthioureas with Electronically Diverse Substituents: A Manifold of Hydrogen Bonding Networks. NEW J CHEM 2014; 38:4071-4082. [PMID: 25214759 PMCID: PMC4157683 DOI: 10.1039/c4nj00521j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 1-arylimidazole-2-thiones, (HmimAr) [Ar = 3,4,5-C6H2(OMe)3, 2,4-C6H3(NO2)(OMe), 2,4,6-C6H2Cl3 and 3,5-C6H3(CF3)2], which feature electronically diverse substituents, may be obtained via acid-catalyzed ring closure of the corresponding N,N'-aryldiethoxyethylthiourea derivatives, ArN(H)C(S)N(H)CH2CH(OEt)2, (H2detuAr), which in turn are obtained via treatment of aminoacetaldehyde diethyl acetal, H2NCH2CH(OEt)2, with the respective arylisothiocyanates (ArNCS). The molecular structures of all of the above N,N'-aryldiethoxyethylthioureas and 1-arylimidazole-2-thiones have been determined by X-ray diffraction, thereby demonstrating that the substituents have a profound effect on the crystal structures. For example, each of the N,N'-aryldiethoxyethylthiourea derivatives adopts a different hydrogen bonding pattern. Specifically, the hydrogen-bonding network in (i) H2detuArCl3 consists of chains of 9-membered rings, with an [ [Formula: see text](9)] motif, that feature one N-H ⋯ O and one N-H ⋯ S interaction, (ii) H2detuArOMe,NO2 consists of chains of 6-membered rings, with an [ [Formula: see text](6)] motif, that feature two head-to-tail N-H ⋯ S interactions, (iii) H2detuAr(CF3)2 consists of a dimer that features two pairs of N-H ⋯ O interactions, of which each pair is a component of an 8-membered ring with an [ [Formula: see text](8)] motif, and (iv) H2detuAr(OMe)3 consists of a chain of head-to-head dimeric rings with a basic [ [Formula: see text](16)] motif, a notable feature of which is that sulfur does not play a role as a hydrogen bond acceptor. Each of the 1-arylimidazole-2-thiones exists as a "head-to-head" hydrogen-bonded dimer in the solid state, with an [ [Formula: see text](8)] motif. However, while the hydrogen-bonded motifs for HmimArCl3 and HmimAr(OMe)3 are planar, those for HmimAr(CF3)2 and HmimArOMe,NO2 are extremely puckered, with fold angles of 24.2° (mean value) and 45.7°, respectively.
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Affiliation(s)
- Joshua H. Palmer
- Department of Chemistry, Columbia University, New York, New York 10027,
USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027,
USA
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Kreider-Mueller A, Rong Y, Owen JS, Parkin G. Molecular structures of tris(2-mercapto-1-tert-butylimidazolyl)hydroborato and tris(2-mercapto-1-adamantylimidazolyl)hydroborato sodium complexes: analysis of [Tm(R)] ligand coordination modes and conformations. Dalton Trans 2014; 43:10852-65. [PMID: 24898480 DOI: 10.1039/c4dt01271b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tris(mercaptoimidazolyl)hydroborato complexes, [κ(3)-S2H-Tm(Bu(t))]Na(THF)3 and [κ(3)-S2H-Tm(Ad)]Na(THF)3, which feature t-butyl and adamantyl substituents, have been synthesized via the reactions of the respective 1-R-1,3-dihydro-2H-imidazole-2-thiones with NaBH4 in THF (R = Bu(t), 1-Ad). X-ray diffraction studies indicate that the compounds are monomeric and that the [Tm(R)] ligands coordinate to the metal in a κ(3)-S2H manner via two of the sulfur donors and the hydrogen attached to boron, a combination that is unprecedented for sodium derivatives. Analysis of the tris(mercaptoimidazolyl)hydroborato compounds that are listed in the Cambridge Structural Database has allowed for the formulation of a set of criteria that enables κ(x)-S(x) and κ(x+1)-S(x)H coordination modes to be identified. Furthermore, the various κ(x)-S(x) and κ(x+1)-S(x)H coordination modes have also been analyzed with respect to the conformations of the [Tm(R)] ligands, which differ by rotation of the imidazolethione moieties about the B-N bond.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
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