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Doumi I, Lang L, Vileno B, Deponte M, Faller P. Glutathione Protects other Cellular Thiols against Oxidation by Cu II-Dp44mT. Chemistry 2024; 30:e202304212. [PMID: 38408264 DOI: 10.1002/chem.202304212] [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: 12/18/2023] [Indexed: 02/28/2024]
Abstract
Cu-thiosemicarbazones have been intensively investigated for their application in cancer therapy or as antimicrobials. Copper(II)-di-2-pyridylketone-4,4-dimethyl-thiosemicarbazone (CuII-Dp44mT) showed anticancer activity in the submicromolar concentration range in cell culture. The interaction of CuII-Dp44mT with thiols leading to their depletion or inhibition was proposed to be involved in this activity. Indeed, CuII-Dp44mT can catalyze the oxidation of thiols although with slow kinetics. The present work aims to obtain insights into the catalytic activity and selectivity of CuII-Dp44mT toward the oxidation of different biologically relevant thiols. Reduced glutathione (GSH), L-cysteine (Cys), N-acetylcysteine (NAC), D-penicillamine (D-Pen), and the two model proteins glutaredoxin (Grx) and thioredoxin (Trx) were investigated. CuII-Dp44mT catalyzed the oxidation of these thiols with different kinetics, with rates in the following order D-Pen>Cys≫NAC>GSH and Trx>Grx. CuII-Dp44mT was more efficient than CuII chloride for the oxidation of NAC and GSH, but not D-Pen and Cys. In mixtures of biologically relevant concentrations of GSH and either Cys, Trx, or Grx, the oxidation kinetics and spectral properties were similar to that of GSH alone, indicating that the interaction of these thiols with CuII-Dp44mT is dominated by GSH. Hence GSH could protect other thiols against potential deleterious oxidation by CuII-Dp44mT.
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Affiliation(s)
- Iman Doumi
- Institut de Chimie (UMR 7177), University of Strasbourg - CNRS, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Lukas Lang
- Faculty of Chemistry, Comparative Biochemistry, RPTU Kaiserslautern, Erwin-Schrödinger Straße 54, D-67663, Kaiserslautern, Germany
| | - Bertrand Vileno
- Institut de Chimie (UMR 7177), University of Strasbourg - CNRS, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Marcel Deponte
- Faculty of Chemistry, Comparative Biochemistry, RPTU Kaiserslautern, Erwin-Schrödinger Straße 54, D-67663, Kaiserslautern, Germany
| | - Peter Faller
- Institut de Chimie (UMR 7177), University of Strasbourg - CNRS, 4 rue Blaise Pascal, 67000, Strasbourg, France
- Institut Universitaire de France (IUF), 1 rue Descartes, 75231, Paris, France
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2
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Gourmand C, Bertagnolli C, Prelot B, Boos A, Hubscher-Bruder V, Brandel J. Competitive adsorption mechanisms of Cd(II), Cu(II) and Pb(II) on bioinspired mesoporous silica revealed by complementary adsorption/isothermal titration calorimetry studies. Dalton Trans 2024; 53:3690-3701. [PMID: 38295371 DOI: 10.1039/d3dt03210h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
This study presents the adsorption properties of a bioinspired grafted mesoporous silica material and the competitive effects between Cd(II) or Cu(II) and Pb(II) during the adsorption process. Glutathione, a natural antioxidant known for its metal binding properties, has been successfully grafted to SBA-15 mesoporous silica and the optimum adsorption parameters were determined. This original and multidisciplinary approach combines classical adsorption studies with thermodynamic investigations to understand the adsorption behavior of Cd(II), Cu(II) and Pb(II) on this material. To this end, isothermal titration calorimetry (ITC) has been used to elucidate the mechanisms of single-metal and two-metal adsorption. The results showed affinity in the order Pb(II) > Cu(II) > Cd(II) in single metal systems. Cd(II) adsorption relied mainly on physical contributions while Cu(II) and Pb(II) adsorption was shown to be chemically driven. Two-metal systems highlighted that Cd(II) and Pb(II) are adsorbed on the same coordination sites, whereas Cu(II) and Pb(II) are adsorbed on different sites. The material showed good selectivity and encouraging results were obtained on real effluents.
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Affiliation(s)
- Cléophée Gourmand
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
| | | | | | - Anne Boos
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
| | | | - Jérémy Brandel
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
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Peschke F, Taladriz‐Sender A, Andrews MJ, Watson AJB, Burley GA. Glutathione Mediates Control of Dual Differential Bio-orthogonal Labelling of Biomolecules. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 135:e202313063. [PMID: 38515866 PMCID: PMC10953330 DOI: 10.1002/ange.202313063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Indexed: 03/23/2024]
Abstract
Traditional approaches to bio-orthogonal reaction discovery have focused on developing reagent pairs that react with each other faster than they are metabolically degraded. Glutathione (GSH) is typically responsible for the deactivation of most bio-orthogonal reagents. Here we demonstrate that GSH promotes a Cu-catalysed (3+2) cycloaddition reaction between an ynamine and an azide. We show that GSH acts as a redox modulator to control the Cu oxidation state in these cycloadditions. Rate enhancement of this reaction is specific for ynamine substrates and is tuneable by the Cu:GSH ratio. This unique GSH-mediated reactivity gradient is then utilised in the dual sequential bio-orthogonal labelling of peptides and oligonucleotides via two distinct chemoselective (3+2) cycloadditions.
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Affiliation(s)
- Frederik Peschke
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Andrea Taladriz‐Sender
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Matthew J. Andrews
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Allan J. B. Watson
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Glenn A. Burley
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
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Peschke F, Taladriz‐Sender A, Andrews MJ, Watson AJB, Burley GA. Glutathione Mediates Control of Dual Differential Bio-orthogonal Labelling of Biomolecules. Angew Chem Int Ed Engl 2023; 62:e202313063. [PMID: 37906440 PMCID: PMC10952886 DOI: 10.1002/anie.202313063] [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: 09/05/2023] [Revised: 10/25/2023] [Accepted: 10/31/2023] [Indexed: 11/02/2023]
Abstract
Traditional approaches to bio-orthogonal reaction discovery have focused on developing reagent pairs that react with each other faster than they are metabolically degraded. Glutathione (GSH) is typically responsible for the deactivation of most bio-orthogonal reagents. Here we demonstrate that GSH promotes a Cu-catalysed (3+2) cycloaddition reaction between an ynamine and an azide. We show that GSH acts as a redox modulator to control the Cu oxidation state in these cycloadditions. Rate enhancement of this reaction is specific for ynamine substrates and is tuneable by the Cu:GSH ratio. This unique GSH-mediated reactivity gradient is then utilised in the dual sequential bio-orthogonal labelling of peptides and oligonucleotides via two distinct chemoselective (3+2) cycloadditions.
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Affiliation(s)
- Frederik Peschke
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Andrea Taladriz‐Sender
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
| | - Matthew J. Andrews
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Allan J. B. Watson
- EaStCHEMSchool of ChemistryUniversity of Saint AndrewsNorth HaughSt AndrewsFifeKY16 9STUK
| | - Glenn A. Burley
- Department of Pure & Applied Chemistry & the Strathclyde Centre for Molecular BioscienceUniversity of Strathclyde295 Cathedral StreetGlasgowG1 1XLUK
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5
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Crmarić D, Bura-Nakić E. Interaction between Cu and Thiols of Biological and Environmental Importance: Case Study Using Combined Spectrophotometric/Bathocuproine Sulfonate Disodium Salt Hydrate (BCS) Assay. Molecules 2023; 28:5065. [PMID: 37446731 DOI: 10.3390/molecules28135065] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/15/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
Considering the biological and ecological importance of Cu-thiol interactions and the discrepancies in previous research, this study focuses on Cu interactions with biologically and ecologically relevant thiols: glutathione (GSH), L-cysteine (L-cys), 3-mercaptopropionic acid (MPA), and thioacetic acid (TAA) in aqueous solution. The addition of Cu(II) to a thiol-containing solution led to a rapid reduction of Cu(II) and the formation of a Cu(I)-thiol complex. The mechanism of Cu(II) reduction and Cu(I) complex formation as well as the kinetics of Cu(I) oxidation strongly depend on the structural properties of the individual thiols investigated. The reducing power of the investigated thiols can be summarized as follows: L-cys ≅ GSH > MPA > TAA. The reaction order, with respect to Cu(I) oxidation, also changes over the time of the reaction course. The deviation of the reaction kinetics from the first order with respect to Cu(I) in the later stages of the reaction course can be attributed to a Fenton-like reaction occurring under low thiol concentration conditions. At high Cu:thiol ratios, in the case of GSH, L-cys, and MPA, the early stage of the reaction course is characterized by high Cu(I) stability, most likely as a result of Cu(I) complexation by the thiols present in excess in the reaction mixture.
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Affiliation(s)
- Dora Crmarić
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička Cesta 54, 10 000 Zagreb, Croatia
| | - Elvira Bura-Nakić
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička Cesta 54, 10 000 Zagreb, Croatia
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Hirth N, Gerlach MS, Wiesemann N, Herzberg M, Große C, Nies DH. Full Copper Resistance in Cupriavidus metallidurans Requires the Interplay of Many Resistance Systems. Appl Environ Microbiol 2023:e0056723. [PMID: 37191542 DOI: 10.1128/aem.00567-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
The metal-resistant bacterium Cupriavidus metallidurans uses its copper resistance components to survive the synergistic toxicity of copper ions and gold complexes in auriferous soils. The cup, cop, cus, and gig determinants encode as central component the Cu(I)-exporting PIB1-type ATPase CupA, the periplasmic Cu(I)-oxidase CopA, the transenvelope efflux system CusCBA, and the Gig system with unknown function, respectively. The interplay of these systems with each other and with glutathione (GSH) was analyzed. Copper resistance in single and multiple mutants up to the quintuple mutant was characterized in dose-response curves, Live/Dead-staining, and atomic copper and glutathione content of the cells. The regulation of the cus and gig determinants was studied using reporter gene fusions and in case of gig also RT-PCR studies, which verified the operon structure of gigPABT. All five systems contributed to copper resistance in the order of importance: Cup, Cop, Cus, GSH, and Gig. Only Cup was able to increase copper resistance of the Δcop Δcup Δcus Δgig ΔgshA quintuple mutant but the other systems were required to increase copper resistance of the Δcop Δcus Δgig ΔgshA quadruple mutant to the parent level. Removal of the Cop system resulted in a clear decrease of copper resistance in most strain backgrounds. Cus cooperated with and partially substituted Cop. Gig and GSH cooperated with Cop, Cus, and Cup. Copper resistance is thus the result of an interplay of many systems. IMPORTANCE The ability of bacteria to maintain homeostasis of the essential-but-toxic "Janus"-faced element copper is important for their survival in many natural environments but also in case of pathogenic bacteria in their respective host. The most important contributors to copper homeostasis have been identified in the last decades and comprise PIB1-type ATPases, periplasmic copper- and oxygen-dependent copper oxidases, transenvelope efflux systems, and glutathione; however, it is not known how all these players interact. This publication investigates this interplay and describes copper homeostasis as a trait emerging from a network of interacting resistance systems.
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Affiliation(s)
- Niklas Hirth
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | | | - Nicole Wiesemann
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Martin Herzberg
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Cornelia Große
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Dietrich H Nies
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
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7
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Zhu P, Pu Y, Wang M, Wu W, Qin H, Shi J. MnOOH-Catalyzed Autoxidation of Glutathione for Reactive Oxygen Species Production and Nanocatalytic Tumor Innate Immunotherapy. J Am Chem Soc 2023; 145:5803-5815. [PMID: 36848658 DOI: 10.1021/jacs.2c12942] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
The antioxidant system, signed with reduced glutathione (GSH) overexpression, is the key weapon for tumor to resist the attack by reactive oxygen species (ROS). Counteracting the ROS depletion by GSH is an effective strategy to guarantee the antitumor efficacy of nanocatalytic therapy. However, simply reducing the concentration of GSH does not sufficiently improve tumor response to nanocatalytic therapy intervention. Herein, a well-dispersed MnOOH nanocatalyst is developed to catalyze GSH autoxidation and peroxidase-like reaction concurrently and respectively to promote GSH depletion and H2O2 decomposition to produce abundant ROS such as hydroxyl radical (·OH), thereby generating a highly effective superadditive catalytic therapeutic efficacy. Such a therapeutic strategy that transforms endogenous "antioxidant" into "oxidant" may open a new avenue for the development of antitumor nanocatalytic medicine. Moreover, the released Mn2+ can activate and sensitize the cGAS-STING pathway to the damaged intratumoral DNA double-strands induced by the produced ROS to further promote macrophage maturation and M1-polarization, which will boost the innate immunotherapeutic efficacy. Resultantly, the developed simple MnOOH nanocatalytic medicine capable of simultaneously catalyzing GSH depletion and ROS generation, and mediating innate immune activation, holds great potential in the treatment of malignant tumors.
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Affiliation(s)
- Piao Zhu
- Shanghai Tenth People's Hospital, Shanghai Frontiers Science Center of Nanocatalytic Medicine, School of Medicine, Tongji University, Shanghai 200331, P. R. China
| | - Yinying Pu
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Ultrasound Research and Education Institute, Tongji University Cancer Center, School of Medicine, Tongji University, Shanghai 200072, P. R. China
| | - Min Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences; Research Unit of Nanocatalytic Medicine in Specific Therapy for Serious Disease, Chinese Academy of Medical Sciences (2021RU012), Shanghai 200050, P. R. China
| | - Wencheng Wu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences; Research Unit of Nanocatalytic Medicine in Specific Therapy for Serious Disease, Chinese Academy of Medical Sciences (2021RU012), Shanghai 200050, P. R. China
| | - Huanlong Qin
- Department of Gastrointestinal Surgey, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, P. R. China
| | - Jianlin Shi
- Shanghai Tenth People's Hospital, Shanghai Frontiers Science Center of Nanocatalytic Medicine, School of Medicine, Tongji University, Shanghai 200331, P. R. China.,State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences; Research Unit of Nanocatalytic Medicine in Specific Therapy for Serious Disease, Chinese Academy of Medical Sciences (2021RU012), Shanghai 200050, P. R. China
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8
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Zhang Y, Dai X, Wang J, Liang J, Rabeah J, Tian X, Yao X, Wang Y, Pang S. In Situ-Generated Cu I Catalytic System for Oxidative N-Formylation of N-Heterocycles and Acyclic Amines with Methanol. CHEMSUSCHEM 2023; 16:e202202104. [PMID: 36478405 DOI: 10.1002/cssc.202202104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/06/2022] [Indexed: 06/17/2023]
Abstract
The development of a sustainable and simple catalytic system for N-formylation of N-heterocycles with methanol by direct coupling remains a challenge, owing to many competing side reactions, given the sensitivity of N-heterocycles to many catalytic oxidation or dehydrogenation systems. This work concerns the development of an in situ-generated CuI catalytic system for oxidative N-formylation of N-heterocycles with methanol that is based on the case study of a more typical 1,2,3,4-tetrahydroquinoline as substrate. Aside from N-heterocycles, some acyclic amines are also transformed into the corresponding N-formamides in moderate yields. Furthermore, a probable reaction mechanism and reaction pathway are proposed and extension of work based on some findings leads to a demonstration that the formed ⋅O2 - and ⋅OOH radicals in the catalytic system is related to the formation of undesired tar-like products.
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Affiliation(s)
- Yujing Zhang
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 730070, Lanzhou, Gansu, P. R. China
| | - Xingchao Dai
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT), Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Jixue Wang
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 730070, Lanzhou, Gansu, P. R. China
| | - Junxi Liang
- Chemical Engineering Institute, Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Northwest Minzu University, 730030, Lanzhou, Gansu, P. R. China
| | - Jabor Rabeah
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT), Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Xia Tian
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 730070, Lanzhou, Gansu, P. R. China
| | - Xiaoqiang Yao
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 730070, Lanzhou, Gansu, P. R. China
| | - Yanbin Wang
- Chemical Engineering Institute, Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Northwest Minzu University, 730030, Lanzhou, Gansu, P. R. China
| | - Shaofeng Pang
- Chemical Engineering Institute, Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Northwest Minzu University, 730030, Lanzhou, Gansu, P. R. China
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Lu X, Cheng T, Geletii YV, Hill CL. Catalytic System for Aerobic Oxidation That Simultaneously Functions as Its Own Redox Buffer. Inorg Chem 2023; 62:2404-2414. [PMID: 36696689 PMCID: PMC9906773 DOI: 10.1021/acs.inorgchem.2c04209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The control of the solution electrochemical potential as well as pH impacts products in redox reactions, but the former gets far less attention. Redox buffers facilitate the maintenance of potentials and have been noted in diverse cases, but they have not been a component of catalytic systems. We report a catalytic system that contains its own built-in redox buffer. Two highly synergistic components (a) the tetrabutylammonium salt of hexavanadopolymolybdate TBA4H5[PMo6V6O40] (PV6Mo6) and (b) Cu(ClO4)2 in acetonitrile catalyze the aerobic oxidative deodorization of thiols by conversion to the corresponding nonodorous disulfides at 23 °C (each catalyst alone is far less active). For example, the reaction of 2-mercaptoethanol with ambient air gives a turnover number (TON) = 3 × 102 in less than one hour with a turnover frequency (TOF) of 6 × 10-2 s-1 with respect to PV6Mo6. Multiple electrochemical, spectroscopic, and other methods establish that (1) PV6Mo6, a multistep and multielectron redox buffering catalyst, controls the speciation and the ratio of Cu(II)/Cu(I) complexes and thus keeps the solution potential in different narrow ranges by involving multiple POM redox couples and simultaneously functions as an oxidation catalyst that receives electrons from the substrate; (2) Cu catalyzes two processes simultaneously, oxidation of the RSH by PV6Mo6 and reoxidation of reduced PV6Mo6 by O2; and (3) the analogous polytungstate-based system, TBA4H5[PW6V6O40] (PV6W6), has nearly identical cyclic voltammograms (CV) as PV6Mo6 but has almost no catalytic activity: it does not exhibit self-redox buffering.
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Abstract
Lytic polysaccharide monooxygenases (LPMOs) are unique redox enzymes capable of disrupting the crystalline surfaces of industry-relevant recalcitrant polysaccharides, such as chitin and cellulose. Historically, LPMOs were thought to be slow enzymes relying on O2 as the co-substrate, but it is now clear that these enzymes prefer H2O2, allowing for fast depolymerization of polysaccharides through a peroxygenase reaction. Thus, quantifying H2O2 in LPMO reaction set-ups is of a great interest. The horseradish peroxidase (HRP)/Amplex Red (AR) assay is one of the most popular and accessible tools for measuring hydrogen peroxide. This assay has been used in various types of biological and biochemical studies, including LPMO research, but suffers from pitfalls that need to be accounted for. In this Chapter, we discuss this method and its use for assessing the often rate-limiting in situ formation of H2O2 in LPMO reactions. We show that, after accounting for multiple potential side reactions, quantitative data on H2O2 production obtained with the HRP/Amplex Red assay provide useful clues for understanding the catalytic activity of LPMOs, including the impact of reductants and transition metal ions.
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Affiliation(s)
- Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway.
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Yan H, Dong J, Luan X, Wang C, Song Z, Chen Q, Ma J, Du X. Ultrathin Porous Nitrogen-Doped Carbon-Coated CuSe Heterostructures for Combination Cancer Therapy of Photothermal Therapy, Photocatalytic Therapy, and Logic-Gated Chemotherapy. ACS APPLIED MATERIALS & INTERFACES 2022; 14:56237-56252. [PMID: 36472929 DOI: 10.1021/acsami.2c12503] [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] [Indexed: 06/17/2023]
Abstract
The construction of nanoplatforms for the multimodal cancer therapy still remains an enormous challenge. Ultrathin porous nitrogen-doped carbon coated stoichiometric copper selenide heterostructures (CuSe/NC) are prepared using a facile and green one-pot hydrothermal method. Interestingly, CuSe/NC itself can achieve both photothermal therapy (PTT) and photocatalytic therapy (PCT) under irradiation of a single near-infrared (NIR) light (808 nm), which is convenient and safe for clinical applications. Importantly, the triple-enhanced NIR light-activated PCT, including O2-independent free radicals, Fenton-like reaction, and glutathione (GSH) depletion, breaks through the limitations of hypoxia and overexpressed GSH in cancer cells. Furthermore, CuSe/NC is loaded with doxorubicin (DOX) via metal coordination and then decorates with DNA to construct the CuSe/NC-DOX-DNA nanoplatform. Surprisingly, the facile nanoplatform has an advanced biocomputing capability of an "AND" Boolean logic gate with the smart "AND" logic controlled release of DOX upon combined stimuli of pH and GSH for precise cancer chemotherapy. The synergistic mechanism of proton-mediated ligand exchange between DOX and GSH is proposed for the "AND" logic controlled drug release from CuSe/NC-DOX-DNA. In vitro and in vivo studies demonstrate that CuSe/NC-DOX-DNA has excellent anticancer efficacy and negligible toxicity. This innovative nanoplatform with multienhanced anticancer efficacy provides a paradigm for combination cancer therapy of PTT, PCT, and chemotherapy.
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Affiliation(s)
- Hua Yan
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, People's Republic of China
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou318000, People's Republic of China
| | - Jiangtao Dong
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, People's Republic of China
| | - Xingkun Luan
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, People's Republic of China
| | - Chen Wang
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, People's Republic of China
| | - Zhenjun Song
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou318000, People's Republic of China
| | - Qi Chen
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou318000, People's Republic of China
| | - Jujiang Ma
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou318000, People's Republic of China
| | - Xuezhong Du
- Key Laboratory of Mesoscopic Chemistry (Ministry of Education), State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, People's Republic of China
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12
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Reaction of N-Acetylcysteine with Cu 2+: Appearance of Intermediates with High Free Radical Scavenging Activity: Implications for Anti-/Pro-Oxidant Properties of Thiols. Int J Mol Sci 2022; 23:ijms23116199. [PMID: 35682881 PMCID: PMC9181168 DOI: 10.3390/ijms23116199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 05/27/2022] [Accepted: 05/30/2022] [Indexed: 11/16/2022] Open
Abstract
We studied the kinetics of the reaction of N-acetyl-l-cysteine (NAC or RSH) with cupric ions at an equimolar ratio of the reactants in aqueous acid solution (pH 1.4−2) using UV/Vis absorption and circular dichroism (CD) spectroscopies. Cu2+ showed a strong catalytic effect on the 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) radical (ABTSr) consumption and autoxidation of NAC. Difference spectra revealed the formation of intermediates with absorption maxima at 233 and 302 nm (ε302/Cu > 8 × 103 M−1 cm−1) and two positive Cotton effects centered at 284 and 302 nm. These intermediates accumulate during the first, O2-independent, phase of the NAC autoxidation. The autocatalytic production of another chiral intermediate, characterized by two positive Cotton effects at 280 and 333 nm and an intense negative one at 305 nm, was observed in the second reaction phase. The intermediates are rapidly oxidized by added ABTSr; otherwise, they are stable for hours in the reaction solution, undergoing a slow pH- and O2-dependent photosensitive decay. The kinetic and spectral data are consistent with proposed structures of the intermediates as disulfide-bridged dicopper(I) complexes of types cis-/trans-CuI2(RS)2(RSSR) and CuI2(RSSR)2. The electronic transitions observed in the UV/Vis and CD spectra are tentatively attributed to Cu(I) → disulfide charge transfer with an interaction of the transition dipole moments (exciton coupling). The catalytic activity of the intermediates as potential O2 activators via Cu(II) peroxo-complexes is discussed. A mechanism for autocatalytic oxidation of Cu(I)−thiolates promoted by a growing electronically coupled −[CuI2(RSSR)]n− polymer is suggested. The obtained results are in line with other reported observations regarding copper-catalyzed autoxidation of thiols and provide new insight into these complicated, not yet fully understood systems. The proposed hypotheses point to the importance of the Cu(I)−disulfide interaction, which may have a profound impact on biological systems.
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Metagenomic insights into the microbial community structure and resistomes of a tropical agricultural soil persistently inundated with pesticide and animal manure use. Folia Microbiol (Praha) 2022; 67:707-719. [PMID: 35415828 DOI: 10.1007/s12223-022-00970-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 04/05/2022] [Indexed: 11/04/2022]
Abstract
Persistent use of pesticides and animal manure in agricultural soils inadvertently introduced heavy metals and antibiotic/antibiotic resistance genes (ARGs) into the soil with deleterious consequences. The microbiome and heavy metal and antibiotic resistome of a pesticide and animal manure inundated agricultural soil (SL6) obtained from a vegetable farm at Otte, Eiyenkorin, Kwara State, Nigeria, was deciphered via shotgun metagenomics and functional annotation of putative ORFs (open reading frames). Structural metagenomics of SL6 microbiome revealed 29 phyla, 49 classes, 94 orders, 183 families, 366 genera, 424 species, and 260 strains with the preponderance of the phyla Proteobacteria (40%) and Actinobacteria (36%), classes Actinobacteria (36%), Alphaproteobacteria (18%), and Gammaproteobacteria (17%), and genera Kocuria (16%), Sphingobacterium (11%), and Brevundimonas (10%), respectively. Heavy metal resistance genes annotation conducted using Biocide and Metal Resistance Gene Database (BacMet) revealed the detection of genes responsible for the uptake, transport, detoxification, efflux, and regulation of copper, cadmium, zinc, nickel, chromium, cobalt, selenium, tungsten, mercury, and several others. ARG annotation using the Antibiotic Resistance Gene-annotation (ARG-ANNOT) revealed ARGs for 11 antibiotic classes with the preponderance of β-lactamases, mobilized colistin resistance determinant (mcr-1), macrolide-lincosamide-streptogramin (MLS), glycopeptide, and aminoglycoside resistance genes, among others. The persistent use of pesticide and animal manure is strongly believed to play a major role in the proliferation of heavy metal and antibiotic resistance genes in the soil. This study revealed that agricultural soils inundated with pesticide and animal manure use are potential hotspots for ARG spread and may accentuate the spread of multidrug resistant clinical pathogens.
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Stepnov AA, Eijsink VGH, Forsberg Z. Enhanced in situ H 2O 2 production explains synergy between an LPMO with a cellulose-binding domain and a single-domain LPMO. Sci Rep 2022; 12:6129. [PMID: 35414104 PMCID: PMC9005612 DOI: 10.1038/s41598-022-10096-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 03/29/2022] [Indexed: 02/02/2023] Open
Abstract
Lytic polysaccharide monooxygenases (LPMOs) are mono-copper enzymes that catalyze oxidative depolymerization of recalcitrant substrates such as chitin or cellulose. Recent work has shown that LPMOs catalyze fast peroxygenase reactions and that, under commonly used reaction set-ups, access to in situ generated H2O2 likely limits catalysis. Based on a hypothesis that the impact of a cellulose-binding module (CBM) on LPMO activity could relate to changes in in situ H2O2 production, we have assessed the interplay between CBM-containing ScLPMO10C and its truncated form comprising the catalytic domain only (ScLPMO10CTR). The results show that truncation of the linker and CBM leads to elevated H2O2 production and decreased enzyme stability. Most interestingly, combining the two enzyme forms yields strong synergistic effects, which are due to the combination of high H2O2 generation by ScLPMO10CTR and efficient productive use of H2O2 by the full-length enzyme. Thus, cellulose degradation becomes faster, while enzyme inactivation due to off-pathway reactions with excess H2O2 is reduced. These results underpin the complexity of ascorbic acid-driven LPMO reactions and reveal a potential mechanism for how LPMOs may interact synergistically during cellulose degradation.
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Affiliation(s)
- Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, 1432, Ås, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, 1432, Ås, Norway.
| | - Zarah Forsberg
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, 1432, Ås, Norway.
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Ma D, Sun J, Shen S, Chen H, Xu W, Wang Y, Song C, Shi T, Huo S. Deprotection of S-Acetamidomethyl and 1,3-Thiazolidine-4-Carbonyl Protecting Groups from Cysteine Side Chains in Peptides by trans-[PtX 2(CN) 4] 2-: One-Pot Regioselective Synthesis of Disulfide Bonds. J Org Chem 2022; 87:1470-1476. [PMID: 34985274 DOI: 10.1021/acs.joc.1c02793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, we developed an efficient approach for disulfide bond formation in peptides utilizing the Pt(IV) complex trans-[PtBr2(CN)4]2- to mediate Acm and Thz deprotections. [PtBr2(CN)4]2- can oxidatively deprotect two Acm groups or deprotect one Thz group and one Acm group to directly form an intramolecular disulfide bond in peptides. Several disulfide-containing peptides with excellent yields were achieved via the deprotection method in an aqueous medium under aerobic conditions. Kinetic studies indicated that the dominant path of the reaction is of first-order in both [Pt(IV)] and [peptide]; moreover, the deprotection rate increased dramatically with the addition of NaBr. A mechanism including a bromide-bridge-mediated electron transfer process was proposed. Apamin, α-conotoxin SI, and the parallel homodimer of oxytocin, all containing two disulfide bonds, were synthesized regioselectively through a one-pot method by the combined use of the above deprotection approach with oxidants l-methionine selenoxide and [PtBr2(CN)4]2-. All of the reactions were completed within 30 min to afford good yields for these peptides.
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Affiliation(s)
- Dongying Ma
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Jingjing Sun
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Shigang Shen
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Hua Chen
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Wenzhi Xu
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Yafang Wang
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Changying Song
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
| | - Tiesheng Shi
- College of Chemistry Chemical Engineering and Material Science, Zaozhuang University, Zaozhuang 277160, Shandong, P. R. China
| | - Shuying Huo
- College of Chemistry and Environmental Science, Key Laboratory of Analytical Science and Technology of Hebei Province, and MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei, P. R. China
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16
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Stepnov AA, Christensen IA, Forsberg Z, Aachmann FL, Courtade G, Eijsink VGH. The impact of reductants on the catalytic efficiency of a lytic polysaccharide monooxygenase and the special role of dehydroascorbic acid. FEBS Lett 2022; 596:53-70. [PMID: 34845720 DOI: 10.1002/1873-3468.14246] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/21/2021] [Accepted: 11/23/2021] [Indexed: 12/13/2022]
Abstract
Monocopper lytic polysaccharide monooxygenases (LPMOs) catalyse oxidative cleavage of glycosidic bonds in a reductant-dependent reaction. Recent studies indicate that LPMOs, rather than being O2 -dependent monooxygenases, are H2 O2 -dependent peroxygenases. Here, we describe SscLPMO10B, a novel LPMO from the phytopathogenic bacterium Streptomyces scabies and address links between this enzyme's catalytic rate and in situ hydrogen peroxide production in the presence of ascorbic acid, gallic acid and l-cysteine. Studies of Avicel degradation showed a clear correlation between the catalytic rate of SscLPMO10B and the rate of H2 O2 generation in the reaction mixture. We also assessed the impact of oxidised ascorbic acid, dehydroascorbic acid (DHA), on LPMO activity, since DHA, which is not considered a reductant, was recently reported to drive LPMO reactions. Kinetic studies, combined with NMR analysis, showed that DHA is unstable and converts into multiple derivatives, some of which are redox active and can fuel the LPMO reaction by reducing the active site copper and promoting H2 O2 production. These results show that the apparent monooxygenase activity observed in SscLPMO10B reactions without exogenously added H2 O2 reflects a peroxygenase reaction.
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Affiliation(s)
- Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, Ås, Norway
| | - Idd A Christensen
- NOBIPOL, Department of Biotechnology and Food Science, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Zarah Forsberg
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, Ås, Norway
| | - Finn L Aachmann
- NOBIPOL, Department of Biotechnology and Food Science, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Gaston Courtade
- NOBIPOL, Department of Biotechnology and Food Science, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Sciences, Ås, Norway
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Madhu NR, Sarkar B, Slama P, Jha NK, Ghorai SK, Jana SK, Govindasamy K, Massanyi P, Lukac N, Kumar D, Kalita JC, Kesari KK, Roychoudhury S. Effect of Environmental Stressors, Xenobiotics, and Oxidative Stress on Male Reproductive and Sexual Health. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1391:33-58. [PMID: 36472815 DOI: 10.1007/978-3-031-12966-7_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This article examines the environmental factor-induced oxidative stress (OS) and their effects on male reproductive and sexual health. There are several factors that induce OS, i.e. radition, metal contamination, xenobiotic compounds, and cigarette smoke and lead to cause toxicity in the cells through metabolic or bioenergetic processes. These environmental factors may produce free radicals and enhance the reactive oxygen species (ROS). Free radicals are molecules that include oxygen and disbalance the amount of electrons that can create major chemical chains in the body and cause oxidation. Oxidative damage to cells may impair male fertility and lead to abnormal embryonic development. Moreover, it does not only cause a vast number of health issues such as ageing, cancer, atherosclerosis, insulin resistance, diabetes mellitus, cardiovascular diseases, ischemia-reperfusion injury, and neurodegenerative disorders but also decreases the motility of spermatozoa while increasing sperm DNA damage, impairing sperm mitochondrial membrane lipids and protein kinases. This chapter mainly focuses on the environmental stressors with further discussion on the mechanisms causing congenital impairments due to poor sexual health and transmitting altered signal transduction pathways in male gonadal tissues.
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Affiliation(s)
- Nithar Ranjan Madhu
- Department of Zoology, Acharya Prafulla Chandra College, New Barrackpore, Kolkata, West Bengal, India
| | - Bhanumati Sarkar
- Department of Botany, Acharya Prafulla Chandra College, New Barrackpore, Kolkata, West Bengal, India
| | - Petr Slama
- Department of Animal Morphology, Physiology and Genetics, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic
| | - Niraj Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, India
| | | | - Sandip Kumar Jana
- Department of Zoology, Bajkul Milani Mahavidyalaya, Purba Medinipur, West Bengal, India
| | - Kadirvel Govindasamy
- Animal Production Division, ICAR Research Complex for NEH Region, Indian Council of Agricultural Research, Umiam, Meghalaya, India
| | - Peter Massanyi
- Department of Animal Physiology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
| | - Norbert Lukac
- Department of Animal Physiology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
| | - Dhruv Kumar
- School of Health Sciences & Technology, UPES University, Dehradun, Uttarakhand, India
| | - Jogen C Kalita
- Department of Zoology, Gauhati University, Guwahati, India
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Stein A, Chen D, Igareta NV, Cotelle Y, Rebelein JG, Ward TR. A Dual Anchoring Strategy for the Directed Evolution of Improved Artificial Transfer Hydrogenases Based on Carbonic Anhydrase. ACS CENTRAL SCIENCE 2021; 7:1874-1884. [PMID: 34849402 PMCID: PMC8620556 DOI: 10.1021/acscentsci.1c00825] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Artificial metalloenzymes result from anchoring a metal cofactor within a host protein. Such hybrid catalysts combine the selectivity and specificity of enzymes with the versatility of (abiotic) transition metals to catalyze new-to-nature reactions in an evolvable scaffold. With the aim of improving the localization of an arylsulfonamide-bearing iridium-pianostool catalyst within human carbonic anhydrase II (hCAII) for the enantioselective reduction of prochiral imines, we introduced a covalent linkage between the host and the guest. Herein, we show that a judiciously positioned cysteine residue reacts with a p-nitropicolinamide ligand bound to iridium to afford an additional sulfonamide covalent linkage. Three rounds of directed evolution, performed on the dually anchored cofactor, led to improved activity and selectivity for the enantioselective reduction of harmaline (up to 97% ee (R) and >350 turnovers on a preparative scale). To evaluate the substrate scope, the best hits of each generation were tested with eight substrates. X-ray analysis, carried out at various stages of the evolutionary trajectory, was used to scrutinize (i) the nature of the covalent linkage between the cofactor and the host as well as (ii) the remodeling of the substrate-binding pocket.
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Affiliation(s)
- Alina Stein
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Dongping Chen
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Nico V. Igareta
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Yoann Cotelle
- Aix-Marseille
Université, CNRS, Centrale Marseille, iSm2, 13284 Marseille, France
| | - Johannes G. Rebelein
- Max
Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, D-35043 Marburg, Germany
| | - Thomas R. Ward
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
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19
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Serum zinc and copper in people with COVID-19 and zinc supplementation in parenteral nutrition. Nutrition 2021; 91-92:111467. [PMID: 34592694 PMCID: PMC8406548 DOI: 10.1016/j.nut.2021.111467] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 06/10/2021] [Accepted: 08/24/2021] [Indexed: 12/25/2022]
Abstract
Objectives Zinc and copper are important to protect cells from oxidative stress and to enhance immunity. An association between low zinc levels and the severity of acute respiratory distress syndrome has been shown for people with COVID-19. We aimed to study serum zinc and copper concentrations in people with severe COVID-19 and zinc supplementation in parenteral nutrition (PN). Methods Thirty-five people with COVID-19 in need of PN were studied in a retrospective design. Serum samples were collected at three time points: at the start of PN, between 3 and 7 d after, and at the end of PN. Results Participants were on PN for a mean of 14 d, with a mean (± SD) daily supplemental zinc of 14.8 ± 3.7 mg/d. Serum zinc increased during PN administration from 98.8 ± 22.8 to 114.1 ± 23.3 µg/dL (Wilks’ λ = 0.751, F = 5.459, P = 0.009). Conversely, serum copper did not vary from baseline (107.9 ± 34.2 µg/dL) to the end of the study (104.5 ± 37.4 µg/dL, Wilks’ λ = 0.919, F = 1.453, P = 0.248). Serum zinc within the first week after starting PN and at the end of PN inversely correlated with total hospital stay (r = −0.413, P = 0.014, and r = −0.386, P = 0.022, respectively). Participants in critical condition presented lower serum copper (z = 2.615, P = 0.007). Mortality was not associated with supplemental zinc or with serum zinc or copper concentrations at any time of the study (P > 0.1 for all analyses). Conclusions Serum zinc concentrations during PN support were inversely associated with length of hospital stay but not with mortality. Serum copper concentrations were lower in participants in critical condition but not associated with prognosis.
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20
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Manavalan T, Stepnov AA, Hegnar OA, Eijsink VGH. Sugar oxidoreductases and LPMOs - two sides of the same polysaccharide degradation story? Carbohydr Res 2021; 505:108350. [PMID: 34049079 DOI: 10.1016/j.carres.2021.108350] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 12/20/2022]
Abstract
Lytic polysaccharide monooxygenases (LPMOs) catalyze the oxidative cleavage of glycosidic bonds in recalcitrant polysaccharides such as chitin and cellulose and their discovery has revolutionized our understanding of enzymatic biomass conversion. The discovery of LPMOs raises interesting new questions regarding the roles of other oxidoreductases and abiotic redox processes in biomass conversion. LPMOs need reducing power and an oxygen co-substrate and biomass degrading ecosystems contain a multitude of redox enzymes that affect the availability of both. For example, biomass degrading fungi produce multiple sugar oxidoreductases whose biological functions so far have remained somewhat enigmatic. It is now conceivable that these redox enzymes, in particular H2O2-producing sugar oxidases, could play a role in fueling and controlling LPMO reactions. Here, we shortly review contemporary issues in the LPMO field, paying particular attention to the possible roles of sugar oxidoreductases.
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Affiliation(s)
- Tamilvendan Manavalan
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Science, N-1432, Ås, Norway
| | - Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Science, N-1432, Ås, Norway
| | - Olav A Hegnar
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Science, N-1432, Ås, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU - Norwegian University of Life Science, N-1432, Ås, Norway.
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21
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Maertens L, Cherry P, Tilquin F, Van Houdt R, Matroule JY. Environmental Conditions Modulate the Transcriptomic Response of Both Caulobacter crescentus Morphotypes to Cu Stress. Microorganisms 2021; 9:1116. [PMID: 34064119 PMCID: PMC8224329 DOI: 10.3390/microorganisms9061116] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 12/13/2022] Open
Abstract
Bacteria encounter elevated copper (Cu) concentrations in multiple environments, varying from mining wastes to antimicrobial applications of copper. As the role of the environment in the bacterial response to Cu ion exposure remains elusive, we used a tagRNA-seq approach to elucidate the disparate responses of two morphotypes of Caulobacter crescentus NA1000 to moderate Cu stress in a complex rich (PYE) medium and a defined poor (M2G) medium. The transcriptome was more responsive in M2G, where we observed an extensive oxidative stress response and reconfiguration of the proteome, as well as the induction of metal resistance clusters. In PYE, little evidence was found for an oxidative stress response, but several transport systems were differentially expressed, and an increased need for histidine was apparent. These results show that the Cu stress response is strongly dependent on the cellular environment. In addition, induction of the extracytoplasmic function sigma factor SigF and its regulon was shared by the Cu stress responses in both media, and its central role was confirmed by the phenotypic screening of a sigF::Tn5 mutant. In both media, stalked cells were more responsive to Cu stress than swarmer cells, and a stronger basal expression of several cell protection systems was noted, indicating that the swarmer cell is inherently more Cu resistant. Our approach also allowed for detecting several new transcription start sites, putatively indicating small regulatory RNAs, and additional levels of Cu-responsive regulation.
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Affiliation(s)
- Laurens Maertens
- Microbiology Unit, Interdisciplinary Biosciences, Belgian Nuclear Research Centre (SCK CEN), 2400 Mol, Belgium; (L.M.); (R.V.H.)
- Research Unit in Microorganisms Biology (URBM), Narilis Institute, University of Namur, 5000 Namur, Belgium; (P.C.); (F.T.)
| | - Pauline Cherry
- Research Unit in Microorganisms Biology (URBM), Narilis Institute, University of Namur, 5000 Namur, Belgium; (P.C.); (F.T.)
| | - Françoise Tilquin
- Research Unit in Microorganisms Biology (URBM), Narilis Institute, University of Namur, 5000 Namur, Belgium; (P.C.); (F.T.)
| | - Rob Van Houdt
- Microbiology Unit, Interdisciplinary Biosciences, Belgian Nuclear Research Centre (SCK CEN), 2400 Mol, Belgium; (L.M.); (R.V.H.)
| | - Jean-Yves Matroule
- Research Unit in Microorganisms Biology (URBM), Narilis Institute, University of Namur, 5000 Namur, Belgium; (P.C.); (F.T.)
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22
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Isei MO, Stevens D, Kamunde C. Temperature rise and copper exposure reduce heart mitochondrial reactive oxygen species scavenging capacity. Comp Biochem Physiol C Toxicol Pharmacol 2021; 243:108999. [PMID: 33556536 DOI: 10.1016/j.cbpc.2021.108999] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/22/2021] [Accepted: 02/01/2021] [Indexed: 12/14/2022]
Abstract
Mitochondria produce and scavenge reactive oxygen species (ROS); however, whether oxidative distress due to exogenous stress arises from excessive production or impaired scavenging remains unclear. We assessed the effect of copper (Cu) and thermal stress on kinetics of ROS (H2O2) consumption in mitochondria isolated from fish heart. Mitochondria were energized with succinate, glutamate-malate or palmitoylcarnitine (PC) and incubated with 1-25 μM Cu at 11 (control) and 23 °C. We found that H2O2 consumption capacity of heart mitochondria varies with substrate and is additively reduced by temperature rise and Cu. While Cu is a potent inhibitor of H2O2 consumption in mitochondria oxidizing glutamate-malate and succinate, mitochondria oxidizing PC are resistant to the inhibitory effect of the metal. Moreover, the sensitivity of H2O2 consumption pathways to Cu depend on the substrate and are greatly impaired during oxidation of glutamate-malate. Pharmacological manipulation of mitochondrial antioxidant systems revealed that NADPH-dependent peroxidase systems are the centerpieces of ROS scavenging in heart mitochondria, with the glutathione-dependent pathway being the most prominent while catalase played a minimal role. Surprisingly, Cu is as efficacious in inhibiting thioredoxin-dependent peroxidase pathway as auranofin, a selective inhibitor of thioredoxin reductase. Taken together, our study uncovered unique mechanisms by which Cu alters mitochondrial H2O2 homeostasis including its ability to inhibit specific mitochondrial ROS scavenging pathways on a par with conventional inhibitors. Importantly, because of additive inhibitory effect on mitochondrial ROS removal mechanisms, hearts of organisms jointly exposed to Cu and thermal stress are likely at increased risk of oxidative distress.
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Affiliation(s)
- Michael O Isei
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
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Stepnov AA, Forsberg Z, Sørlie M, Nguyen GS, Wentzel A, Røhr ÅK, Eijsink VGH. Unraveling the roles of the reductant and free copper ions in LPMO kinetics. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:28. [PMID: 33478537 PMCID: PMC7818938 DOI: 10.1186/s13068-021-01879-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Accepted: 01/07/2021] [Indexed: 05/02/2023]
Abstract
BACKGROUND Lytic polysaccharide monooxygenases (LPMOs) are monocopper enzymes that catalyze oxidative depolymerization of industrially relevant crystalline polysaccharides, such as cellulose, in a reaction that depends on an electron donor and O2 or H2O2. While it is well known that LPMOs can utilize a wide variety of electron donors, the variation in reported efficiencies of various LPMO-reductant combinations remains largely unexplained. RESULTS In this study, we describe a novel two-domain cellulose-active family AA10 LPMO from a marine actinomycete, which we have used to look more closely at the effects of the reductant and copper ions on the LPMO reaction. Our results show that ascorbate-driven LPMO reactions are extremely sensitive to very low amounts (micromolar concentrations) of free copper because reduction of free Cu(II) ions by ascorbic acid leads to formation of H2O2, which speeds up the LPMO reaction. In contrast, the use of gallic acid yields steady reactions that are almost insensitive to the presence of free copper ions. Various experiments, including dose-response studies with the enzyme, showed that under typically used reaction conditions, the rate of the reaction is limited by LPMO-independent formation of H2O2 resulting from oxidation of the reductant. CONCLUSION The strong impact of low amounts of free copper on LPMO reactions with ascorbic acid and O2, i.e. the most commonly used conditions when assessing LPMO activity, likely explains reported variations in LPMO rates. The observed differences between ascorbic acid and gallic acid show a way of making LPMO reactions less copper-dependent and illustrate that reductant effects on LPMO action need to be interpreted with great caution. In clean reactions, with minimized generation of H2O2, the (O2-driven) LPMO reaction is exceedingly slow, compared to the much faster peroxygenase reaction that occurs when adding H2O2.
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Affiliation(s)
- Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Zarah Forsberg
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Morten Sørlie
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Giang-Son Nguyen
- Department of Biotechnology and Nanomedicine, SINTEF Industry, Trondheim, Norway
| | - Alexander Wentzel
- Department of Biotechnology and Nanomedicine, SINTEF Industry, Trondheim, Norway
| | - Åsmund K Røhr
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway.
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24
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Zhou L, Li T, Sun Y, Tian H, Gao C, Liu C, Kong L, Zhang G, Shi T. Mechanistic scrutiny of the oxidations of thiol‐containing drugs cysteamine and
d
‐penicillamine by
cis
‐diamminetetrachloroplatinum(IV). INT J CHEM KINET 2020. [DOI: 10.1002/kin.21464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Li Zhou
- College of Chemistry, Chemical Engineering and Materials Science Zaozhuang University Zaozhuang Shandong Province 277160 China
| | - Tiejian Li
- National Engineering Technology Center of Chirality Pharmaceuticals Lunan Pharmaceutical Group Co., Ltd. Linyi Shandong Province 276006 China
- Shandong New Time Pharmaceutical Co., Ltd. Feixian Shandong Province 273400 China
| | - Ying Sun
- National Engineering Technology Center of Chirality Pharmaceuticals Lunan Pharmaceutical Group Co., Ltd. Linyi Shandong Province 276006 China
| | - Hongwu Tian
- Shandong New Time Pharmaceutical Co., Ltd. Feixian Shandong Province 273400 China
| | - Cunxiu Gao
- National Engineering Technology Center of Chirality Pharmaceuticals Lunan Pharmaceutical Group Co., Ltd. Linyi Shandong Province 276006 China
| | - Chunli Liu
- College of Chemistry, Chemical Engineering and Materials Science Zaozhuang University Zaozhuang Shandong Province 277160 China
| | - Lingli Kong
- College of Chemistry, Chemical Engineering and Materials Science Zaozhuang University Zaozhuang Shandong Province 277160 China
| | - Guimin Zhang
- National Engineering Technology Center of Chirality Pharmaceuticals Lunan Pharmaceutical Group Co., Ltd. Linyi Shandong Province 276006 China
- Shandong New Time Pharmaceutical Co., Ltd. Feixian Shandong Province 273400 China
| | - Tiesheng Shi
- College of Chemistry, Chemical Engineering and Materials Science Zaozhuang University Zaozhuang Shandong Province 277160 China
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25
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Gao M, An P, Rao H, Niu Z, Xue X, Luo M, Liu X, Xue Z, Lu X. Molecule-gated surface chemistry of Pt nanoparticles for constructing activity-controllable nanozymes and a three-in-one sensor. Analyst 2020; 145:1279-1287. [PMID: 31867591 DOI: 10.1039/c9an01956a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Herein, a simple strategy for constructing activity-controllable nanozymes is proposed based on the glutathione (GSH)-gated surface chemistry of citrate-capped Pt nanoparticles (PtNPs). PtNPs have been shown to have oxidase-like activity that can effectively catalyze the oxidation of 3,3',5,5'-tertamethylbenzidine (TMB) by O2, resulting in a typical color reaction from colorless to blue. We found that GSH can inhibit the oxidase-like activity of PtNPs as a molecule-gated surface chemistry element, resulting in a dramatic decrease of the oxidation of TMB. The addition of copper ions (Cu2+) could oxidize GSH into glutathione disulfide (GSSG), resulting in the distinct suppression of GSH-modulated PtNP surface chemistry and oxidase-like activity inhibition, which further results in a significant acceleration of TMB oxidation and the obvious recovery of intense blue color. Furthermore, the color-based detection signal associated with the redox of TMB indicator here was found to show good fluorescence and a photothermal effect and exhibit sensitive and selective response toward the proposed molecule-gated surface chemistry and Cu2+ target. On the basis of this phenomenon, we successfully constructed a three-in-one sensor for Cu2+ with a triple signal readout, colorimetric, photothermal (temperature), and fluorescence, depending on the proposed in situ modulation method for PtNP catalysis. The applicability of the three-in-one sensor was also demonstrated by measuring Cu2+ in human serum with a standard addition method, and the results are of satisfactory accuracy as confirmed by ICP-MS measurements.
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Affiliation(s)
- Min Gao
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
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26
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Andrei A, Öztürk Y, Khalfaoui-Hassani B, Rauch J, Marckmann D, Trasnea PI, Daldal F, Koch HG. Cu Homeostasis in Bacteria: The Ins and Outs. MEMBRANES 2020; 10:E242. [PMID: 32962054 PMCID: PMC7558416 DOI: 10.3390/membranes10090242] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/11/2020] [Accepted: 09/15/2020] [Indexed: 12/16/2022]
Abstract
Copper (Cu) is an essential trace element for all living organisms and used as cofactor in key enzymes of important biological processes, such as aerobic respiration or superoxide dismutation. However, due to its toxicity, cells have developed elaborate mechanisms for Cu homeostasis, which balance Cu supply for cuproprotein biogenesis with the need to remove excess Cu. This review summarizes our current knowledge on bacterial Cu homeostasis with a focus on Gram-negative bacteria and describes the multiple strategies that bacteria use for uptake, storage and export of Cu. We furthermore describe general mechanistic principles that aid the bacterial response to toxic Cu concentrations and illustrate dedicated Cu relay systems that facilitate Cu delivery for cuproenzyme biogenesis. Progress in understanding how bacteria avoid Cu poisoning while maintaining a certain Cu quota for cell proliferation is of particular importance for microbial pathogens because Cu is utilized by the host immune system for attenuating pathogen survival in host cells.
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Affiliation(s)
- Andreea Andrei
- Institut für Biochemie und Molekularbiologie, ZBMZ, Medizinische Fakultät, Albert-Ludwigs Universität Freiburg; Stefan Meier Str. 17, 79104 Freiburg, Germany; (A.A.); (Y.O.); (J.R.); (D.M.)
- Fakultät für Biologie, Albert-Ludwigs Universität Freiburg; Schänzlestrasse 1, 79104 Freiburg, Germany
| | - Yavuz Öztürk
- Institut für Biochemie und Molekularbiologie, ZBMZ, Medizinische Fakultät, Albert-Ludwigs Universität Freiburg; Stefan Meier Str. 17, 79104 Freiburg, Germany; (A.A.); (Y.O.); (J.R.); (D.M.)
| | | | - Juna Rauch
- Institut für Biochemie und Molekularbiologie, ZBMZ, Medizinische Fakultät, Albert-Ludwigs Universität Freiburg; Stefan Meier Str. 17, 79104 Freiburg, Germany; (A.A.); (Y.O.); (J.R.); (D.M.)
| | - Dorian Marckmann
- Institut für Biochemie und Molekularbiologie, ZBMZ, Medizinische Fakultät, Albert-Ludwigs Universität Freiburg; Stefan Meier Str. 17, 79104 Freiburg, Germany; (A.A.); (Y.O.); (J.R.); (D.M.)
| | | | - Fevzi Daldal
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Hans-Georg Koch
- Institut für Biochemie und Molekularbiologie, ZBMZ, Medizinische Fakultät, Albert-Ludwigs Universität Freiburg; Stefan Meier Str. 17, 79104 Freiburg, Germany; (A.A.); (Y.O.); (J.R.); (D.M.)
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27
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Muñoz-Villagrán C, Contreras F, Cornejo F, Figueroa M, Valenzuela-Bezanilla D, Luraschi R, Reinoso C, Rivas-Pardo J, Vásquez C, Castro M, Arenas F. Understanding gold toxicity in aerobically-grown Escherichia coli. Biol Res 2020; 53:26. [PMID: 32513271 PMCID: PMC7278051 DOI: 10.1186/s40659-020-00292-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 05/16/2020] [Indexed: 12/03/2022] Open
Abstract
Background There is an emerging field to put into practice new strategies for developing molecules with antimicrobial properties. In this line, several metals and metalloids are currently being used for these purposes, although their cellular effect(s) or target(s) in a particular organism are still unknown. Here we aimed to investigate and analyze Au3+ toxicity through a combination of biochemical and molecular approaches. Results We found that Au3+ triggers a major oxidative unbalance in Escherichia coli, characterized by decreased intracellular thiol levels, increased superoxide concentration, as well as by an augmented production of the antioxidant enzymes superoxide dismutase and catalase. Because ROS production is, in some cases, associated with metal reduction and the concomitant generation of gold-containing nanostructures (AuNS), this possibility was evaluated in vivo and in vitro. Conclusions Au3+ is toxic for E. coli because it triggers an unbalance of the bacterium’s oxidative status. This was demonstrated by using oxidative stress dyes and antioxidant chemicals as well as gene reporters, RSH concentrations and AuNS generation.
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Affiliation(s)
- C Muñoz-Villagrán
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - F Contreras
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - F Cornejo
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - M Figueroa
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - D Valenzuela-Bezanilla
- Laboratorio de Microbiología Aplicada, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad Santo Tomás, Sede Santiago, Chile
| | - R Luraschi
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - C Reinoso
- Laboratorio de Microbiología Aplicada, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad Santo Tomás, Sede Santiago, Chile
| | - J Rivas-Pardo
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Laboratorio de Biología estructural, Centro de Genómica y Bioinformática, Universidad Mayor, Santiago, Chile
| | - C Vásquez
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - M Castro
- Laboratorio de Microbiología Aplicada, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad Santo Tomás, Sede Santiago, Chile.
| | - F Arenas
- Laboratorio Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.
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Amarnath Reddy KK, Moi S, Dolle A, Hosamani B, Krishnamurthy K, Prakash S, Raghothama S, Gowd KH. Synthesis of Peptide Cysteine Dimedone Using Fmoc‐Cys(Dmd)‐OH: Glutathione Cysteine Dimedone as a Probe in Investigating the Sulfenic Acid Mediated Oxidation of Glutathione. Helv Chim Acta 2020. [DOI: 10.1002/hlca.202000062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- K. Kasi Amarnath Reddy
- Department of ChemistrySchool of Chemical SciencesCentral University of Karnataka Kalaburagi 585367 Karnataka India
| | - Smriti Moi
- Department of ChemistrySchool of Chemical SciencesCentral University of Karnataka Kalaburagi 585367 Karnataka India
| | - Ashwini Dolle
- Department of ChemistrySchool of Chemical SciencesCentral University of Karnataka Kalaburagi 585367 Karnataka India
| | - Basavaprabhu Hosamani
- Department of ChemistrySchool of Chemical SciencesCentral University of Karnataka Kalaburagi 585367 Karnataka India
| | - Kiran Krishnamurthy
- NMR Research CentreIndian Institute of Science Bangalore 560012 Karnataka India
| | - Sunita Prakash
- Proteomic facilityMolecular Biophysics UnitIndian Institute of Science Bangalore 560012 Karnataka India
| | | | - Konkallu Hanumae Gowd
- Department of ChemistrySchool of Chemical SciencesCentral University of Karnataka Kalaburagi 585367 Karnataka India
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29
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Effects of cadmium perturbation on the microbial community structure and heavy metal resistome of a tropical agricultural soil. BIORESOUR BIOPROCESS 2020. [DOI: 10.1186/s40643-020-00314-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
AbstractThe effects of cadmium (Cd) contamination on the microbial community structure, soil physicochemistry and heavy metal resistome of a tropical agricultural soil were evaluated in field-moist soil microcosms. A Cd-contaminated agricultural soil (SL5) and an untreated control (SL4) were compared over a period of 5 weeks. Analysis of the physicochemical properties and heavy metals content of the two microcosms revealed a statistically significant decrease in value of the soil physicochemical parameters (P < 0.05) and concentration of heavy metals (Cd, Pb, Cr, Zn, Fe, Cu, Se) content of the agricultural soil in SL5 microcosm. Illumina shotgun sequencing of the DNA extracted from the two microcosms showed the predominance of the phyla, classes, genera and species of Proteobacteria (37.38%), Actinobacteria (35.02%), Prevotella (6.93%), and Conexibacter woesei (8.93%) in SL4, and Proteobacteria (50.50%), Alphaproteobacteria (22.28%), Methylobacterium (9.14%), and Methylobacterium radiotolerans (12,80%) in SL5, respectively. Statistically significant (P < 0.05) difference between the metagenomes was observed at genus and species delineations. Functional annotation of the two metagenomes revealed diverse heavy metal resistome for the uptake, transport, efflux and detoxification of various heavy metals. It also revealed the exclusive detection in SL5 metagenome of members of RND (resistance nodulation division) protein czcCBA efflux system (czcA, czrA, czrB), CDF (cation diffusion facilitator) transporters (czcD), and genes for enzymes that protect the microbial cells against cadmium stress (sodA, sodB, ahpC). The results obtained in this study showed that Cd contamination significantly affects the soil microbial community structure and function, modifies the heavy metal resistome, alters the soil physicochemistry and results in massive loss of some autochthonous members of the community not adapted to the Cd stress.
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Abstract
This paper aims at demonstrating the significance of biochar risk evaluation and reviewing risk evaluation from the aspects of pyrolysis process, feedstock, and sources of hazards in biochar and their potential effects and the methods used in risk evaluation. Feedstock properties and the resultant biochar produced at different pyrolysis process influence their chemical, physical, and structural properties, which are vital in understanding the functionality of biochar. Biochar use has been linked to some risks in soil application such as biochar being toxic, facilitating GHGs emission, suppression of the effectiveness of pesticides, and effects on soil microbes. These potential risks originate from feedstock, contaminated feedstock, and pyrolysis conditions that favor the creation of characteristics and functional groups of this nature. These toxic compounds formed pose a threat to human health through the food chain. Determination of toxicity levels is a first step in the risk management of toxic biochar. Various sorption methods of biochar utilized low-cost adsorbents, engineered surface functional groups, and nZVI modified biochars. The mechanisms of organic compound removal was through sorption, enhanced sorption, modified biochar, postpyrolysis thermal air oxidation and that of PFRs degradation was through activation, photoactive functional groups, magnetization, and hydrothermal synthesis. Emissions of GHGs in soils amended with biochar emanated through physical and biotic mediated mechanisms. BCNs have a significance in reducing the health quotient indices for PTEs risk contamination by suppressing cancer risk arising from consumption of contaminated food. The degree of environmental risk assessment of HM pollution in biomass and biochars has been determined by using potential ecological risk index and RAC while organic contaminant degradation by EPFRs was considered when assessing the environmental roles of biochar in regulating the fate of contaminants removal. The magnitude of technologies’ net benefit must be considered in relation to the associated risks.
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31
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Reductions of the cisplatin-based platinum(IV) prodrug cis,cis,trans-[Pt(NH3)2Cl2Br2] by predominant biological thiols: kinetic and mechanistic studies. TRANSIT METAL CHEM 2019. [DOI: 10.1007/s11243-019-00311-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tabbì G, Magrì A, Rizzarelli E. The copper(II) binding centres of carbonic anhydrase are differently affected by reductants that ensure the redox intracellular environment. J Inorg Biochem 2019; 199:110759. [PMID: 31299377 DOI: 10.1016/j.jinorgbio.2019.110759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/18/2019] [Accepted: 07/01/2019] [Indexed: 01/25/2023]
Abstract
Copper is involved in several biological processes. The static and labile copper pools are controlled by means of a network of influx and efflux transporters, storage proteins, chaperones, transcription factors and small molecules as glutathione (GSH), which contributes to the cell reducing environment. To follow the fate of intracellular copper labile pool, a variant of human apocarbonic anhydrase has been proposed as fluorescent probe to monitor cytoplasmic Cu2+. Aware that in this cellular compartment copper ion is present as Cu+, electron spin resonance technique (ESR) was used to ascertain whether (bovine or human) carbonic anhydrase (CA) was able to accommodate Cu+ in the same sites occupied by Cu2+, in the presence of naturally occurring reducing agents such as ascorbate and GSH. Our ESR results on Cu2+ complexes with CA allow for a complete characterization of the two metal binding sites of the protein in solution. The use of the reported affinity constants of zinc in the catalytic site and of Cu2+ in the peripheral and catalytic site, allow us to obtain the speciation of copper species mimicking the spectroscopic study conditions. The different Cu2+ coordination features in the catalytic and the peripheral (the N-terminus cleft mouth) binding sites influence the chemical reduction effect of the two main naturally occurring reductants. Ascorbate reversibly reduces the Cu2+ complex with CA, while glutathione irreversibly induces the formation of Cu2+ complex with its oxidized form (GSSG). Our results questioned the use of CA as intracellular Cu2+ sensor. Furthermore, translating these findings to intracellular environment, the conversion of GSH in GSSG can significantly alter the metallostasis.
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Affiliation(s)
- Giovanni Tabbì
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy
| | - Antonio Magrì
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy
| | - Enrico Rizzarelli
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy; Department of Chemical Sciences, University of Catania, Viale A. Doria 6, Catania, Italy; Consorzio Interuniversitario per la Ricerca dei Metalli nei Sistemi Biologici, Via Ulpiani 27, Bari, Italy.
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Singh D, Raina TK, Kumar A, Singh J, Prasad R. Plant microbiome: A reservoir of novel genes and metabolites. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.plgene.2019.100177] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhang J, Duan D, Xu J, Fang J. Redox-Dependent Copper Carrier Promotes Cellular Copper Uptake and Oxidative Stress-Mediated Apoptosis of Cancer Cells. ACS APPLIED MATERIALS & INTERFACES 2018; 10:33010-33021. [PMID: 30209950 DOI: 10.1021/acsami.8b11061] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Transportation of exogenous copper ions into cancer cells by copper carriers has gained increasing interest for cancer chemotherapy. We disclosed herein a redox-dependent copper carrier, 2,2'-dithiodipyridine (DPy), which binds copper ions and carries the cargo into cells. The cellular reducing environment cleaved the disulfide bond in DPy to facilitate unloading copper ions. The elevated copper level then elicits oxidative stress and subsequently promotes the reformation of DPy. Further mechanistic studies revealed that the DPy/copper combination predominantly targets the cellular redox-regulating systems, including the thioredoxin system and the glutathione system, to induce the oxidative stress-mediated death of tumor cells. The discovery of DPy as a cleavable and recyclable copper shuttle provides a proof of concept for designing novel biomaterials for copper transportation as potential anticancer agents.
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Affiliation(s)
| | | | - Jianqiang Xu
- School of Life Science and Medicine & Panjin Industrial Technology Institute , Dalian University of Technology , Panjin Campus , Panjin 124221 , China
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Zhao J, Rebelein JG, Mallin H, Trindler C, Pellizzoni MM, Ward TR. Genetic Engineering of an Artificial Metalloenzyme for Transfer Hydrogenation of a Self-Immolative Substrate in Escherichia coli's Periplasm. J Am Chem Soc 2018; 140:13171-13175. [PMID: 30272972 DOI: 10.1021/jacs.8b07189] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Artificial metalloenzymes (ArMs), which combine an abiotic metal cofactor with a protein scaffold, catalyze various synthetically useful transformations. To complement the natural enzymes' repertoire, effective optimization protocols to improve ArM's performance are required. Here we report on our efforts to optimize the activity of an artificial transfer hydrogenase (ATHase) using Escherichia coli whole cells. For this purpose, we rely on a self-immolative quinolinium substrate which, upon reduction, releases fluorescent umbelliferone, thus allowing efficient screening. Introduction of a loop in the immediate proximity of the Ir-cofactor afforded an ArM with up to 5-fold increase in transfer hydrogenation activity compared to the wild-type ATHase using purified mutants.
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Affiliation(s)
- Jingming Zhao
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
| | - Johannes G Rebelein
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
| | - Hendrik Mallin
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
| | - Christian Trindler
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
| | - Michela M Pellizzoni
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
| | - Thomas R Ward
- Department of Chemistry , University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland
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Dixon P, Powell K, Chauhan A. Novel approaches for improving stability of cysteamine formulations. Int J Pharm 2018; 549:466-475. [PMID: 30099213 DOI: 10.1016/j.ijpharm.2018.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 07/26/2018] [Accepted: 08/06/2018] [Indexed: 10/28/2022]
Abstract
Cystinosis is a genetic disorder that leads to the formation of cystine crystals in many organs in the body including cornea. Ocular manifestation of this disease is treated by eye drops of cysteamine which can easily oxidize into its disulfide cystamine. The rapid oxidation limits the shelf life as well the duration during which the drug can be used after opening the eye drop bottle. We evaluate two approaches of preventing the oxidation of cysteamine with the goal of increasing the time of use after opening the bottle to one month. The first approach integrates antioxidants such as catalase enzyme and vitamins C and E into the aqueous solution. Results show that catalase is the most effective additive as it decreases the oxidation rate by 58%, which on its own is not sufficient to reach targeted one month stability. The second approach focuses on incorporating diffusion barriers to prevent oxygen from reaching the cysteamine solution. This was accomplished by two methods: formulation of a hydrophobic layer which floats on the surface of the aqueous solution and integration of OMAC® oxygen-resistant material into the eye drop bottle. Both methods delay the onset of cysteamine degradation and decrease the rate of degradation. In particular, an eye drop bottle with three layers of OMAC® has less than 10% degradation after one month of opening the bottle and withdrawing a drop each day. By integrating all three methods, we designed a system where >90% of cysteamine remains in the active form for 70 days after opening the bottle. In addition, we examine the use of OMAC® as heat-sealed pouches for storage of cysteamine eye drop bottles during packaging to eliminate the need for the current approach of freezing the formulation during shipping. The results show that such heat-sealed pouches would keep cysteamine stable for over one year at ambient conditions.
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Affiliation(s)
- Phillip Dixon
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.
| | - Kristin Powell
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.
| | - Anuj Chauhan
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, United States.
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Geersing A, Ségaud N, van der Wijst MGP, Rots MG, Roelfes G. Importance of Metal-Ion Exchange for the Biological Activity of Coordination Complexes of the Biomimetic Ligand N4Py. Inorg Chem 2018; 57:7748-7756. [PMID: 29916702 PMCID: PMC6030684 DOI: 10.1021/acs.inorgchem.8b00714] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Indexed: 12/24/2022]
Abstract
Metal coordination complexes can display interesting biological activity, as illustrated by the bleomycins (BLMs), a family of natural antibiotics that when coordinated to a redox-active metal ion, show antitumor activity. Yet, which metal ion is required for the activity in cells is still subject to debate. In this study, we described how different metal ions affect the intracellular behavior and activity of the synthetic BLM-mimic N, N-bis(2-pyridylmethyl)- N-bis(2-pyridyl)methylamine (N4Py). Our study shows that a mixture of iron(II), copper(II), and zinc(II) complexes can be generated when N4Py is added to cell cultures but that the metal ion can also be exchanged by other metal ions present in cells. Moreover, the combination of chemical data, together with the performed biological experiments, shows that the active complex causing oxidative damage to cells is the FeII-N4Py complex and not per se the metal complex that was initially added to the cell culture medium. Finally, it is proposed that the high activity observed upon the addition of the free N4Py ligand is the result of a combination of scavenging of biologically relevant metals and oxidative damage caused by the iron(II) complex.
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Affiliation(s)
- Arjan Geersing
- Stratingh Institute
for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Nathalie Ségaud
- Stratingh Institute
for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Monique G. P. van der Wijst
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Marianne G. Rots
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Gerard Roelfes
- Stratingh Institute
for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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38
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Yu W, Zhang T, Ma M, Chen C, Liang X, Wen K, Wang Z, Shen J. Highly sensitive visual detection of amantadine residues in poultry at the ppb level: A colorimetric immunoassay based on a Fenton reaction and gold nanoparticles aggregation. Anal Chim Acta 2018; 1027:130-136. [PMID: 29866262 DOI: 10.1016/j.aca.2018.04.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/03/2018] [Accepted: 04/10/2018] [Indexed: 12/11/2022]
Abstract
Colorimetric biosensors for the on-site visual detection of veterinary drug residues are required for food control in developing countries and other resource-constrained areas, where sophisticated instruments may not be available. In this study, we developed a highly sensitive immunoassay for amantadine residues in poultry. By introducing a novel signal generation strategy into an indirect competitive immunoassay, a highly sensitive assay for amantadine residues in chicken was achieved for naked eye readout at the part per billion (ppb) level. Signal amplification was achieved in the designed immunoassay by combining conventional indirect competitive enzyme-linked immunosorbent assay, Fenton reaction-regulated oxidation of cysteine, and gold nanoparticle aggregation. Therefore, the cascade reaction remarkably enhanced the assay sensitivity and led to a pronounced color change from red to dark purple in the solution, which could be easily distinguished with the naked eye even at approximately 1 μg kg-1 in poultry muscle. Moreover, the color change can be quantitatively assayed with a classic high-throughput plate reader for contaminated poultry samples. The limit of detection (LOD) was 0.51 nM (0.095 ng mL-1). The recovery rates for spiked chicken samples ranged from 78% to 84% with relative standard deviations <15%. Therefore, we propose that this immunoassay could be generally applicable for on-site detection in the field of food control.
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Affiliation(s)
- Wenbo Yu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Tingting Zhang
- Department of Critical Care Medicine, Guangzhou First People's Hospital, Guangzhou, 510180, People's Republic of China
| | - Mingfang Ma
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Chaochao Chen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Xiao Liang
- College of Veterinary Medicine, Qingdao Agricultural University, No.700 Changcheng Road, Qingdao, 266109, People's Republic of China
| | - Kai Wen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Zhanhui Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China.
| | - Jianzhong Shen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China.
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39
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Xu Y, Seshadri B, Sarkar B, Wang H, Rumpel C, Sparks D, Farrell M, Hall T, Yang X, Bolan N. Biochar modulates heavy metal toxicity and improves microbial carbon use efficiency in soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 621:148-159. [PMID: 29179070 DOI: 10.1016/j.scitotenv.2017.11.214] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 11/17/2017] [Accepted: 11/18/2017] [Indexed: 05/17/2023]
Abstract
Soil organic carbon is essential to improve soil fertility and ecosystem functioning. Soil microorganisms contribute significantly to the carbon transformation and immobilisation processes. However, microorganisms are sensitive to environmental stresses such as heavy metals. Applying amendments, such as biochar, to contaminated soils can alleviate the metal toxicity and add carbon inputs. In this study, Cd and Pb spiked soils treated with macadamia nutshell biochar (5% w/w) were monitored during a 49days incubation period. Microbial phospholipid fatty acids (PLFAs) were extracted and analysed as biomarkers in order to identify the microbial community composition. Soil properties, metal bioavailability, microbial respiration, and microbial biomass carbon were measured after the incubation period. Microbial carbon use efficiency (CUE) was calculated from the ratio of carbon incorporated into microbial biomass to the carbon mineralised. Total PLFA concentration decreased to a greater extent in metal contaminated soils than uncontaminated soils. Microbial CUE also decreased due to metal toxicity. However, biochar addition alleviated the metal toxicity, and increased total PLFA concentration. Both microbial respiration and biomass carbon increased due to biochar application, and CUE was significantly (p<0.01) higher in biochar treated soils than untreated soils. Heavy metals reduced the microbial carbon sequestration in contaminated soils by negatively influencing the CUE. The improvement of CUE through biochar addition in the contaminated soils could be attributed to the decrease in metal bioavailability, thereby mitigating the biotoxicity to soil microorganisms.
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Affiliation(s)
- Yilu Xu
- Global Center for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Balaji Seshadri
- Global Center for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Binoy Sarkar
- Department of Animal and Plant Sciences, The University of Sheffield, Sheffield S10 2TN, UK; Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Hailong Wang
- School of Environment and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China
| | - Cornelia Rumpel
- CNRS, Institute of Ecology and Environment Paris, IEES, CNRS-INRA-UPMC-UPEC-IRD, Thiverval-Grignon 78850, France
| | - Donald Sparks
- Department of Plant and Soil Sciences, Delaware Environmental Institute, University of Delaware, Newark 19711, USA
| | - Mark Farrell
- CSIRO Agriculture & Food, Locked Bag 2, Glen Osmond, SA 5064, Australia
| | - Tony Hall
- Sprigg Geobiology Centre & Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Xiaodong Yang
- Global Center for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia; Key Laboratory of Oasis Ecology, Urumqi 830046, China; Institute of Resources and Environment Science, Xinjiang University, Urumqi 830046, China
| | - Nanthi Bolan
- Global Center for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation for the Environment, University of Newcastle, Callahan, NSW 2308, Australia; International Centre for Balanced Land Use, University of Newcastle, NSW 2308, Australia.
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40
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Essa AMM, Al Abboud MA, Khatib SI. Metal transformation as a strategy for bacterial detoxification of heavy metals. J Basic Microbiol 2017; 58:17-29. [PMID: 29141107 DOI: 10.1002/jobm.201700143] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/19/2017] [Accepted: 09/21/2017] [Indexed: 11/06/2022]
Abstract
Microorganisms can modify the chemical and physical characters of metals leading to an alteration in their speciation, mobility, and toxicity. Aqueous heavy metals solutions (Hg, Cd, Pb, Ag, Cu, and Zn) were treated with the volatile metabolic products (VMPs) of Escherichia coli Z3 for 24 h using aerobic bioreactor. The effect of the metals treated with VMPs in comparison to the untreated metals on the growth of E. coli S1 and Staphylococcus aureus S2 (local isolates) was examined. Moreover, the toxic properties of the treated and untreated metals were monitored using minimum inhibitory concentration assay. A marked reduction of the treated metals toxicity was recorded in comparison to the untreated metals. Scanning electron microscopy and energy dispersive X-ray analysis revealed the formation of metal particles in the treated metal solutions. In addition to heavy metals at variable ratios, these particles consisted of carbon, oxygen, sulfur, nitrogen elements. The inhibition of metal toxicity was attributed to the existence of ammonia, hydrogen sulfide, and carbon dioxide in the VMPs of E. coli Z3 culture that might responsible for the transformation of soluble metal ions into metal complexes. This study clarified the capability of E. coli Z3 for indirect detoxification of heavy metals via the immobilization of metal ions into biologically unavailable species.
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Affiliation(s)
- Ashraf M M Essa
- Faculty of Science, Botany Department, Fayoum University, Fayoum, Egypt.,Faculty of Science, Biology Department, Jazan University, Jazan, Saudi Arabia
| | - Mohamed A Al Abboud
- Faculty of Science, Biology Department, Jazan University, Jazan, Saudi Arabia
| | - Sayeed I Khatib
- Faculty of Science, Biology Department, Jazan University, Jazan, Saudi Arabia
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41
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Tian H, Dong J, Chi X, Xu L, Shi H, Shi T. Reduction of Cisplatin and Carboplatin Pt(IV) Prodrugs by Homocysteine: Kinetic and Mechanistic Investigations. INT J CHEM KINET 2017. [DOI: 10.1002/kin.21107] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Hongwu Tian
- College of Chemistry and Environmental Science and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics; Hebei University; Baoding 071002 People's Republic of China
| | - Jingran Dong
- College of Chemistry and Environmental Science and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics; Hebei University; Baoding 071002 People's Republic of China
| | - Xueru Chi
- College of Chemistry and Environmental Science and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics; Hebei University; Baoding 071002 People's Republic of China
| | - Liyao Xu
- College of Chemistry and Environmental Science and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics; Hebei University; Baoding 071002 People's Republic of China
| | - Hongmei Shi
- School of Public Health; Hebei Medical University; Shijiazhuang 050017 People's Republic of China
| | - Tiesheng Shi
- College of Chemistry and Environmental Science and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics; Hebei University; Baoding 071002 People's Republic of China
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42
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Govindu PCV, Sudarshan C, Gowd KH. Synthesis of two closely spaced cysteine barbiturates containing peptides by copper-catalyzed oxidation of contryphan disulfide. SYNTHETIC COMMUN 2017. [DOI: 10.1080/00397911.2017.1336245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Panchada Ch. V. Govindu
- Department of Chemistry, School of Chemical Sciences, Central University of Karnataka, Kalaburagi, Karnataka, India
| | - Chidanad Sudarshan
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, Karnataka, India
| | - Konkallu Hanumae Gowd
- Department of Chemistry, School of Chemical Sciences, Central University of Karnataka, Kalaburagi, Karnataka, India
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43
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A novel sensitive colorimetric sensor for Cu2+ based on in situ formation of fluorescent quantum dots with photocatalytic activity. Biosens Bioelectron 2017; 89:866-870. [DOI: 10.1016/j.bios.2016.09.105] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 09/27/2016] [Accepted: 09/28/2016] [Indexed: 01/28/2023]
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44
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Cuéllar-Cruz M, Lucio-Hernández D, Martínez-Ángeles I, Demitri N, Polentarutti M, Rosales-Hoz MJ, Moreno A. Biosynthesis of micro- and nanocrystals of Pb (II), Hg (II) and Cd (II) sulfides in four Candida species: a comparative study of in vivo and in vitro approaches. Microb Biotechnol 2017; 10:405-424. [PMID: 28093869 PMCID: PMC5328821 DOI: 10.1111/1751-7915.12485] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 11/13/2016] [Accepted: 11/14/2016] [Indexed: 02/04/2023] Open
Abstract
Nature produces biominerals (biogenic minerals) that are synthesized as complex structures, in terms of their physicochemical properties. These biominerals are composed of minerals and biological macromolecules. They are produced by living organisms and are usually formed through a combination of chemical, biochemical and biophysical processes. Microorganisms like Candida in the presence of heavy metals can biomineralize those metals to form microcrystals (MCs) and nanocrystals (NCs). In this work, MCs and NCs of PbS, HgS or HgCl2 as well as CdS are synthesized both in vitro (gels) and in vivo by four Candida species. Our in vivo results show that, in the presence of Pb2+, Candida cells are able to replicate and form extracellular PbS MCs, whereas in the presence of Hg2+ and Cd2+, they did synthesize intercellular MCs from HgS or HgCl2 and CdS NCs respectively. The MCs and NCs biologically obtained in Candida were compared with those PbS, HgS and CdS crystals synthetically obtained in vitro through the gel method (grown either in agarose or in sodium metasilicate hydrogels). This is, to our knowledge, the first time that the biosynthesis of the various MCs and NCs (presented in several species of Candida) has been reported. This biosynthesis is differentially regulated in each of these pathogens, which allows them to adapt and survive in different physiological and environmental habitats.
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Affiliation(s)
- Mayra Cuéllar-Cruz
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Noria Alta S/N, Col. Noria Alta, C.P. 36050, Guanajuato, México
| | - Daniela Lucio-Hernández
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Noria Alta S/N, Col. Noria Alta, C.P. 36050, Guanajuato, México
| | - Isabel Martínez-Ángeles
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad Universitaria, Ciudad de México, 04510, México
| | - Nicola Demitri
- Elettra - Sincrotone Trieste, S.S. 14 km 163.5 in Area Science Park, 34149, Basovizza - Trieste, Italy
| | - Maurizio Polentarutti
- Elettra - Sincrotone Trieste, S.S. 14 km 163.5 in Area Science Park, 34149, Basovizza - Trieste, Italy
| | - María J Rosales-Hoz
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del I.P.N., Apdo. Postal 14-740, 07000, México, D.F, México
| | - Abel Moreno
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad Universitaria, Ciudad de México, 04510, México
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45
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Ngamchuea K, Batchelor-McAuley C, Compton RG. The Copper(II)-Catalyzed Oxidation of Glutathione. Chemistry 2016; 22:15937-15944. [PMID: 27649691 DOI: 10.1002/chem.201603366] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Indexed: 11/09/2022]
Abstract
The kinetics and mechanisms of the copper(II)-catalyzed GSH (glutathione) oxidation are examined in the light of its biological importance and in the use of blood and/or saliva samples for GSH monitoring. The rates of the free thiol consumption were measured spectrophotometrically by reaction with DTNB (5,5'-dithiobis-(2-nitrobenzoic acid)), showing that GSH is not auto-oxidized by oxygen in the absence of a catalyst. In the presence of Cu2+ , reactions with two timescales were observed. The first step (short timescale) involves the fast formation of a copper-glutathione complex by the cysteine thiol. The second step (longer timescale) is the overall oxidation of GSH to GSSG (glutathione disulfide) catalyzed by copper(II). When the initial concentrations of GSH are at least threefold in excess of Cu2+ , the rate law is deduced to be -d[thiol]/dt=k[copper-glutathione complex][O2 ]0.5 [H2 O2 ]-0.5 . The 0.5th reaction order with respect to O2 reveals a pre-equilibrium prior to the rate-determining step of the GSSG formation. In contrast to [Cu2+ ] and [O2 ], the rate of the reactions decreases with increasing concentrations of GSH. This inverse relationship is proposed to be a result of the competing formation of an inactive form of the copper-glutathione complex (binding to glutamic and/or glycine moieties).
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Affiliation(s)
- Kamonwad Ngamchuea
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.
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46
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Chen C, Lei W, Lu M, Zhang J, Zhang Z, Luo C, Chen Y, Hong Q, Shen Z. Characterization of Cu(II) and Cd(II) resistance mechanisms in Sphingobium sp. PHE-SPH and Ochrobactrum sp. PHE-OCH and their potential application in the bioremediation of heavy metal-phenanthrene co-contaminated sites. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:6861-6872. [PMID: 26670028 DOI: 10.1007/s11356-015-5926-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 12/03/2015] [Indexed: 06/05/2023]
Abstract
Soil that is co-contaminated with heavy metals (HMs) and polycyclic aromatic hydrocarbons (PAHs) is difficult to bioremediate due to the ability of toxic metals to inhibit PAH degradation by bacteria. We demonstrated the resistance mechanisms to Cu(II) and Cd(II) of two newly isolated strains of Sphingobium sp. PHE-SPH and Ochrobactrum sp. PHE-OCH and further tested their potential application in the bioremediation of HM-phenanthrene (PhA) co-contaminated sites. The PHE-SPH and PHE-OCH strains tolerated 4.63 and 4.34 mM Cu(II) and also showed tolerance to 0.48 and 1.52 mM Cd(II), respectively. Diverse resistance patterns were detected between the two strains. In PHE-OCH cells, the maximum accumulation of Cu(II) occurred in the cell wall, while the maximum accumulation was in the cytoplasm of PHE-SPH cells. This resulted in a sudden suppression of growth in PHE-OCH and a gradual inhibition in PHE-SPH as the concentration of Cu(II) increased. Organic acid production was markedly higher in PHE-OCH than in PHE-SPH, which may also have a role in the resistance mechanisms, and contributes to the higher Cd(II) tolerance of PHE-OCH. The factors involved in the absorption of Cu(II) or Cd(II) in PHE-SPH and PHE-OCH were identified as proteins and carbohydrates by Fourier transform infrared (FT-IR) spectroscopy. Furthermore, both strains showed the ability to efficiently degrade PhA and maintained this high degradation efficiency under HM stress. The high tolerance to HMs and the PhA degradation capacity make Sphingobium sp. PHE-SPH and Ochrobactrum sp. PHE-OCH excellent candidate organisms for the bioremediation of HM-PhA co-contaminated sites.
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Affiliation(s)
- Chen Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Wenrui Lei
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Min Lu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Jianan Zhang
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Zhou Zhang
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Chunling Luo
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People's Republic of China
| | - Yahua Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Qing Hong
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Zhenguo Shen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
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47
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A kinetic analysis of oxidation of the antioxidant N-acetyl-l-cysteine (NAC) by Pt(IV) complexes. TRANSIT METAL CHEM 2016. [DOI: 10.1007/s11243-016-0021-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Dong J, Ren Y, Huo S, Shen S, Xu J, Tian H, Shi T. Reduction of ormaplatin and cis-diamminetetrachloroplatinum(iv) by ascorbic acid and dominant thiols in human plasma: kinetic and mechanistic analyses. Dalton Trans 2016; 45:11326-37. [DOI: 10.1039/c6dt01804a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reductions of Pt(iv) anticancer prodrugs [Pt(dach)Cl4] (ormaplatin/tetraplatin) and cis-[Pt(NH3)2Cl4] by several dominant reductants in human plasma have been characterized and analyzed kinetically and mechanistically.
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Affiliation(s)
- Jingran Dong
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Yanli Ren
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Shuying Huo
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Shigang Shen
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Jianzhong Xu
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Hongwu Tian
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
| | - Tiesheng Shi
- College of Chemistry and Environmental Science
- and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics
- Hebei University
- Baoding 071002
- People's Republic of China
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49
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Lu Y, Hou X, Zhao X, Liu M, Shen F, Ren Y, Liu Y, Huo S, Shen S. Kinetics and mechanism of oxidation of 3,6-dioxa-1,8-octanedithiol and dl-dithiothreitol by a platinum(IV) complex. TRANSIT METAL CHEM 2015. [DOI: 10.1007/s11243-015-9995-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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50
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Characterization of the mechanism of reduction of trans-diamminetetrachloroplatinum(IV) by l-cysteine and dl-homocysteine. TRANSIT METAL CHEM 2015. [DOI: 10.1007/s11243-015-9983-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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