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Skvortsov AN, Ilyechova EY, Puchkova LV. Chemical background of silver nanoparticles interfering with mammalian copper metabolism. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131093. [PMID: 36905906 DOI: 10.1016/j.jhazmat.2023.131093] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
The rapidly increasing application of silver nanoparticles (AgNPs) boosts their release into the environment, which raises a reasonable alarm for ecologists and health specialists. This is manifested as increased research devoted to the influence of AgNPs on physiological and cellular processes in various model systems, including mammals. The topic of the present paper is the ability of silver to interfere with copper metabolism, the potential health effects of this interference, and the danger of low silver concentrations to humans. The chemical properties of ionic and nanoparticle silver, supporting the possibility of silver release by AgNPs in extracellular and intracellular compartments of mammals, are discussed. The possibility of justified use of silver for the treatment of some severe diseases, including tumors and viral infections, based on the specific molecular mechanisms of the decrease in copper status by silver ions released from AgNPs is also discussed.
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Affiliation(s)
- Alexey N Skvortsov
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Laboratory of Molecular Biology of Stem Cells, Institute of Cytology of the Russian Academy of Sciences, Saint Petersburg 194064, Russia
| | - Ekaterina Yu Ilyechova
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Department of Molecular Genetics, Institute of Experimental Medicine of the Russian Academy of Sciences, Saint Petersburg 197376, Russia; Research Center of Advanced Functional Materials and Laser Communication Systems (RC AFMLCS), ITMO University, Saint Petersburg 197101, Russia.
| | - Ludmila V Puchkova
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Department of Molecular Genetics, Institute of Experimental Medicine of the Russian Academy of Sciences, Saint Petersburg 197376, Russia; Research Center of Advanced Functional Materials and Laser Communication Systems (RC AFMLCS), ITMO University, Saint Petersburg 197101, Russia
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2
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Ratiometric Zinc Biosensor Based on Bioluminescence Resonance Energy Transfer: Trace Metal Ion Determination with Tunable Response. Int J Mol Sci 2022; 23:ijms232314936. [PMID: 36499262 PMCID: PMC9738544 DOI: 10.3390/ijms232314936] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/18/2022] [Accepted: 11/23/2022] [Indexed: 12/03/2022] Open
Abstract
Determination of metal ions such as zinc in solution remains an important task in analytical and biological chemistry. We describe a novel zinc ion biosensing approach using a carbonic anhydrase-Oplophorus luciferase fusion protein that employs bioluminescence resonance energy transfer (BRET) to transduce the level of free zinc as a ratio of emission intensities in the blue and orange portions of the spectrum. In addition to high sensitivity (below nanomolar levels) and selectivity, this approach allows both quantitative determination of "free" zinc ion (also termed "mobile" or "labile") using bioluminescence ratios and determination of the presence of the ion above a threshold simply by the change in color of bioluminescence, without an instrument. The carbonic anhydrase metal ion sensing platform offers well-established flexibility in sensitivity, selectivity, and response kinetics. Finally, bioluminescence labeling has proven an effective approach for molecular imaging in vivo since no exciting light is required; the expressible nature of this sensor offers the prospect of imaging zinc fluxes in vivo.
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3
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PC-12 Cell Line as a Neuronal Cell Model for Biosensing Applications. BIOSENSORS 2022; 12:bios12070500. [PMID: 35884303 PMCID: PMC9313070 DOI: 10.3390/bios12070500] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/04/2022] [Accepted: 07/07/2022] [Indexed: 12/02/2022]
Abstract
PC-12 cells have been widely used as a neuronal line study model in many biosensing devices, mainly due to the neurogenic characteristics acquired after differentiation, such as high level of secreted neurotransmitter, neuron morphology characterized by neurite outgrowth, and expression of ion and neurotransmitter receptors. For understanding the pathophysiology processes involved in brain disorders, PC-12 cell line is extensively assessed in neuroscience research, including studies on neurotoxicity, neuroprotection, or neurosecretion. Various analytical technologies have been developed to investigate physicochemical processes and the biosensors based on optical and electrochemical techniques, among others, have been at the forefront of this development. This article summarizes the application of different biosensors in PC-12 cell cultures and presents the modern approaches employed in neuronal networks biosensing.
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Priessner M, Summers PA, Lewis BW, Sastre M, Ying L, Kuimova MK, Vilar R. Selective Detection of Cu
+
Ions in Live Cells via Fluorescence Lifetime Imaging Microscopy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Martin Priessner
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Peter A. Summers
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Benjamin W. Lewis
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Magdalena Sastre
- Department of Brain Sciences Imperial College London Hammersmith Campus London W12 0NN UK
| | - Liming Ying
- National Heart and Lung Institute Molecular Sciences Research Hub White City Campus Imperial College London London W12 0BZ UK
| | - Marina K. Kuimova
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Ramon Vilar
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
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5
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Priessner M, Summers PA, Lewis BW, Sastre M, Ying L, Kuimova MK, Vilar R. Selective Detection of Cu + Ions in Live Cells via Fluorescence Lifetime Imaging Microscopy. Angew Chem Int Ed Engl 2021; 60:23148-23153. [PMID: 34379368 PMCID: PMC8596571 DOI: 10.1002/anie.202109349] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Indexed: 11/06/2022]
Abstract
Copper is an essential trace element in living organisms with its levels and localisation being carefully managed by the cellular machinery. However, if misregulated, deficiency or excess of copper ions can lead to several diseases. Therefore, it is important to have reliable methods to detect, monitor and visualise this metal in cells. Herein we report a new optical probe based on BODIPY, which shows a switch-on in its fluorescence intensity upon binding to copper(I), but not in the presence of high concentration of other physiologically relevant metal ions. More interestingly, binding to copper(I) leads to significant changes in the fluorescence lifetime of the new probe, which can be used to visualize copper(I) pools in lysosomes of live cells via fluorescence lifetime imaging microscopy (FLIM).
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Affiliation(s)
- Martin Priessner
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Peter A. Summers
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Benjamin W. Lewis
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Magdalena Sastre
- Department of Brain SciencesImperial College LondonHammersmith CampusLondonW12 0NNUK
| | - Liming Ying
- National Heart and Lung InstituteMolecular Sciences Research HubWhite City CampusImperial College LondonLondonW12 0BZUK
| | - Marina K. Kuimova
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Ramon Vilar
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
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Wi S, Hwang IS, Jo BH. Engineering a Plant Viral Coat Protein for In Vitro Hybrid Self-Assembly of CO2-Capturing Catalytic Nanofilaments. Biomacromolecules 2020; 21:3847-3856. [DOI: 10.1021/acs.biomac.0c00925] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Suhan Wi
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju 52828, Korea
| | - In Seong Hwang
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju 52828, Korea
| | - Byung Hoon Jo
- Division of Life Science and Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea
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7
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Aydin Z, Yan B, Wei Y, Guo M. A novel near-infrared turn-on and ratiometric fluorescent probe capable of copper(ii) ion determination in living cells. Chem Commun (Camb) 2020; 56:6043-6046. [PMID: 32427230 PMCID: PMC7372572 DOI: 10.1039/d0cc01481h] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A near-infrared ratiometric fluorescent probe CR-Ac based on a coumarin-benzopyrylium platform has been developed for selective detection of Cu2+. The cell imaging data revealed the capabilities of CR-Ac in monitoring the dynamic changes of subcellular Cu2+ and the quantification of Cu2+ levels in living cells.
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Affiliation(s)
- Ziya Aydin
- Vocational School of Technical Sciences, Karamanoğlu Mehmetbey University, Karaman 70100, Turkey.
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Szmacinski H, Hegde K, Zeng HH, Eslami K, Puche AC, Lengyel I, Thompson RB. Imaging hydroxyapatite in sub-retinal pigment epithelial deposits by fluorescence lifetime imaging microscopy with tetracycline staining. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-11. [PMID: 32319262 PMCID: PMC7171513 DOI: 10.1117/1.jbo.25.4.047001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
SIGNIFICANCE Recent evidence suggests that hydroxyapatite (HAP) in sub-retinal pigment epithelial (sub-RPE) deposits in aged human eyes may act to nucleate and contribute to their growth to clinically detectable size. Sub-RPE deposits such as drusen are clinical hallmarks of age-related macular degeneration (AMD), therefore enhanced and earlier detection is a clinical need. We found that tetracycline-family antibiotics, long known to stain HAP in teeth and bones, can also label the HAP in sub-RPE deposits. However, HAP-bound tetracycline fluorescence excitation and emission spectra overlap with the well-known autofluorescence of outer retinal tissues, making them difficult to resolve. AIM In this initial study, we sought to determine if the HAP-bound tetracyclines also exhibit enhanced fluorescence lifetimes, providing a useful difference in lifetime compared with the short lifetimes observed in vivo in the human retina by the pioneering work of Schweitzer, Zinkernagel, Hammer, and their colleagues, and thus a large enough effect size to resolve the HAP from background by fluorescence lifetime imaging. APPROACH We stained authentic HAP with tetracyclines and measured the lifetime(s) by phase fluorometry, and stained aged, fixed human cadaver retinas with drusen with selected tetracyclines and imaged them by fluorescence lifetime imaging microscopy (FLIM). RESULTS We found that chlortetracycline and doxycycline exhibited substantial increase in fluorescence lifetime compared to the free antibiotics and the retinal background, and the drusen were easily resolvable from the retinal background in these specimens by FLIM. CONCLUSIONS These findings suggest that FLIM imaging of tetracycline (and potentially other molecules) binding to HAP could become a diagnostic tool for the development and progression of AMD.
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Affiliation(s)
- Henryk Szmacinski
- University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, Baltimore, Maryland, United States
| | - Kavita Hegde
- Coppin State University, Department of Natural Sciences, Baltimore, United States
| | - Hui-Hui Zeng
- University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, Baltimore, Maryland, United States
| | - Katayoun Eslami
- University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, Baltimore, Maryland, United States
| | - Adam C. Puche
- University of Maryland School of Medicine, Anatomy and Neuroscience, Baltimore, Maryland, United States
| | - Imre Lengyel
- Queen’s University Belfast, Wellcome Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Science, Belfast, United Kingdom
| | - Richard B. Thompson
- University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, Baltimore, Maryland, United States
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9
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Witkowska D, Rowińska-Żyrek M. Biophysical approaches for the study of metal-protein interactions. J Inorg Biochem 2019; 199:110783. [PMID: 31349072 DOI: 10.1016/j.jinorgbio.2019.110783] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/10/2019] [Accepted: 07/15/2019] [Indexed: 12/17/2022]
Abstract
Protein-protein interactions play important roles for a variety of cell functions, often involving metal ions; in fact, metal-ion binding mediates and regulates the activity of a wide range of biomolecules. Enlightening all of the specific features of metal-protein and metal-mediated protein-protein interactions can be a very challenging task; a detailed knowledge of the thermodynamic and spectroscopic parameters and the structural changes of the protein is normally required. For this purpose, many experimental techniques are employed, embracing all fields of Analytical and Bioinorganic Chemistry. In addition, the use of peptide models, reproducing the primary sequence of the metal-binding sites, is also proved to be useful. In this paper, a review of the most useful techniques for studying ligand-protein interactions with a special emphasis on metal-protein interactions is provided, with a critical summary of their strengths and limitations.
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Affiliation(s)
- Danuta Witkowska
- Public Higher Medical Professional School in Opole, Katowicka 68, 45060 Opole, Poland.
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10
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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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11
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Grüter A, Hoffmann M, Müller R, Wohland T, Jung G. A high-affinity fluorescence probe for copper(II) ions and its application in fluorescence lifetime correlation spectroscopy. Anal Bioanal Chem 2019; 411:3229-3240. [PMID: 31025181 DOI: 10.1007/s00216-019-01798-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/21/2019] [Accepted: 03/21/2019] [Indexed: 10/26/2022]
Abstract
Copper is one of the most important transition metals in many organisms where it catalyzes a manifold of different processes. As a result of copper's redox activity, organisms have to avoid unbound ions, and a dysfunctional copper homeostasis may lead to multifarious pathological processes in cells with very severe ramifications for the affected organisms. In many neurodegenerative diseases, however, the exact role of copper ions is still not completely clarified. In this work, a high-affinity and highly selective copper probe molecule, based on the naturally occurring tetrapeptide DAHK is synthesized. The sensor (log KD = - 12.8 ± 0.1) is tagged with a fluorescent BODIPY dye whose fluorescence lifetime distinctly decreases from 5.8 ns ± 0.2 ns to 0.4 ns ± 0.1 ns on binding to copper(II) cations. It is shown by using fluorescence lifetime correlation spectroscopy that the concentration of both probe and probe-copper complex can be simultaneously measured even at nanomolar concentration levels. This work presents a possible starting point for a new type of probe and method for future in vivo studies to further reveal the exact role of copper ions in organisms. Graphical abstract.
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Affiliation(s)
- Andreas Grüter
- Department of Biophysical Chemistry, Saarland University, Campus B2 2, 66123, Saarbrücken, Germany
| | - Michael Hoffmann
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Center for Infection Research, Saarland University, Campus E8 1, 66123, Saarbrücken, Germany
| | - Rolf Müller
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Center for Infection Research, Saarland University, Campus E8 1, 66123, Saarbrücken, Germany
| | - Thorsten Wohland
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.,Department of Biological Sciences, Center for Bio-Imaging Sciences, National University of Singapore, Singapore, 117557, Singapore
| | - Gregor Jung
- Department of Biophysical Chemistry, Saarland University, Campus B2 2, 66123, Saarbrücken, Germany.
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12
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Kardos J, Héja L, Simon Á, Jablonkai I, Kovács R, Jemnitz K. Copper signalling: causes and consequences. Cell Commun Signal 2018; 16:71. [PMID: 30348177 PMCID: PMC6198518 DOI: 10.1186/s12964-018-0277-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 09/24/2018] [Indexed: 12/18/2022] Open
Abstract
Copper-containing enzymes perform fundamental functions by activating dioxygen (O2) and therefore allowing chemical energy-transfer for aerobic metabolism. The copper-dependence of O2 transport, metabolism and production of signalling molecules are supported by molecular systems that regulate and preserve tightly-bound static and weakly-bound dynamic cellular copper pools. Disruption of the reducing intracellular environment, characterized by glutathione shortage and ambient Cu(II) abundance drives oxidative stress and interferes with the bidirectional, copper-dependent communication between neurons and astrocytes, eventually leading to various brain disease forms. A deeper understanding of of the regulatory effects of copper on neuro-glia coupling via polyamine metabolism may reveal novel copper signalling functions and new directions for therapeutic intervention in brain disorders associated with aberrant copper metabolism.
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Affiliation(s)
- Julianna Kardos
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - László Héja
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - Ágnes Simon
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - István Jablonkai
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - Richard Kovács
- Institute of Neurophysiology, Charité-Universitätsmedizin, Berlin, Germany
| | - Katalin Jemnitz
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
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13
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Holliday MJ, Ferrao R, de Leon Boenig G, Estevez A, Helgason E, Rohou A, Dueber EC, Fairbrother WJ. Picomolar zinc binding modulates formation of Bcl10-nucleating assemblies of the caspase recruitment domain (CARD) of CARD9. J Biol Chem 2018; 293:16803-16817. [PMID: 30206119 DOI: 10.1074/jbc.ra118.004821] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 09/04/2018] [Indexed: 12/28/2022] Open
Abstract
The caspase recruitment domain-containing protein 9 (CARD9)-B-cell lymphoma/leukemia 10 (Bcl10) signaling axis is activated in myeloid cells during the innate immune response to a variety of diverse pathogens. This signaling pathway requires a critical caspase recruitment domain (CARD)-CARD interaction between CARD9 and Bcl10 that promotes downstream activation of factors, including NF-κB and the mitogen-activated protein kinase (MAPK) p38. Despite these insights, CARD9 remains structurally uncharacterized, and little mechanistic understanding of its regulation exists. We unexpectedly found here that the CARD in CARD9 binds to Zn2+ with picomolar affinity-a concentration comparable with the levels of readily accessible Zn2+ in the cytosol. NMR solution structures of the CARD9-CARD in the apo and Zn2+-bound states revealed that Zn2+ has little effect on the ground-state structure of the CARD; yet the stability of the domain increased considerably upon Zn2+ binding, with a concomitant reduction in conformational flexibility. Moreover, Zn2+ binding inhibited polymerization of the CARD9-CARD into helical assemblies. Here, we also present a 20-Å resolution negative-stain EM (NS-EM) structure of these filamentous assemblies and show that they adopt a similar helical symmetry as reported previously for filaments of the Bcl10 CARD. Using both bulk assays and direct NS-EM visualization, we further show that the CARD9-CARD assemblies can directly template and thereby nucleate Bcl10 polymerization, a capacity considered critical to propagation of the CARD9-Bcl10 signaling cascade. Our findings indicate that CARD9 is a potential target of Zn2+-mediated signaling that affects Bcl10 polymerization in innate immune responses.
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Affiliation(s)
| | - Ryan Ferrao
- Structural Biology Department, Genentech, South San Francisco, California 94080
| | | | - Alberto Estevez
- Structural Biology Department, Genentech, South San Francisco, California 94080
| | | | - Alexis Rohou
- Structural Biology Department, Genentech, South San Francisco, California 94080
| | - Erin C Dueber
- From the Early Discovery Biochemistry Department and
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14
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Chen B, Wang L, Zhao Y, Ni Y, Xin C, Zhang C, Liu J, Ge J, Li L, Huang W. Photocontrollable fluorogenic probes for visualising near-membrane copper(ii) in live cells. RSC Adv 2017. [DOI: 10.1039/c7ra03559d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Photocontrollable fluorogenic probes for detecting near-membrane copper(ii) after membrane anchoring using spatial and temporal controlled release.
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15
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Coordination properties of a Schiff base probe for Zn2+ ion in aqueous media having no Cu2+ ion interference. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Walsh AJ, Sharick JT, Skala MC, Beier HT. Temporal binning of time-correlated single photon counting data improves exponential decay fits and imaging speed. BIOMEDICAL OPTICS EXPRESS 2016; 7:1385-99. [PMID: 27446663 PMCID: PMC4929649 DOI: 10.1364/boe.7.001385] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 03/15/2016] [Accepted: 03/15/2016] [Indexed: 05/06/2023]
Abstract
Time-correlated single photon counting (TCSPC) enables acquisition of fluorescence lifetime decays with high temporal resolution within the fluorescence decay. However, many thousands of photons per pixel are required for accurate lifetime decay curve representation, instrument response deconvolution, and lifetime estimation, particularly for two-component lifetimes. TCSPC imaging speed is inherently limited due to the single photon per laser pulse nature and low fluorescence event efficiencies (<10%) required to reduce bias towards short lifetimes. Here, simulated fluorescence lifetime decays are analyzed by SPCImage and SLIM Curve software to determine the limiting lifetime parameters and photon requirements of fluorescence lifetime decays that can be accurately fit. Data analysis techniques to improve fitting accuracy for low photon count data were evaluated. Temporal binning of the decays from 256 time bins to 42 time bins significantly (p<0.0001) improved fit accuracy in SPCImage and enabled accurate fits with low photon counts (as low as 700 photons/decay), a 6-fold reduction in required photons and therefore improvement in imaging speed. Additionally, reducing the number of free parameters in the fitting algorithm by fixing the lifetimes to known values significantly reduced the lifetime component error from 27.3% to 3.2% in SPCImage (p<0.0001) and from 50.6% to 4.2% in SLIM Curve (p<0.0001). Analysis of nicotinamide adenine dinucleotide-lactate dehydrogenase (NADH-LDH) solutions confirmed temporal binning of TCSPC data and a reduced number of free parameters improves exponential decay fit accuracy in SPCImage. Altogether, temporal binning (in SPCImage) and reduced free parameters are data analysis techniques that enable accurate lifetime estimation from low photon count data and enable TCSPC imaging speeds up to 6x and 300x faster, respectively, than traditional TCSPC analysis.
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Affiliation(s)
- Alex J. Walsh
- National Research Council, JBSA Fort Sam Houston, Texas, 78234, USA
- 711th Human Performance Wing, Human Effectiveness Directorate, Bioeffects Division, Optical Radiation Bioeffects Branch, Air Force Research Lab, JBSA Fort Sam Houston, Texas, 78234, USA
| | - Joe T. Sharick
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, 37235, USA
| | - Melissa C. Skala
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, 37235, USA
| | - Hope T. Beier
- 711th Human Performance Wing, Human Effectiveness Directorate, Bioeffects Division, Optical Radiation Bioeffects Branch, Air Force Research Lab, JBSA Fort Sam Houston, Texas, 78234, USA
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17
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Abstract
Metal ions play an important role in various biological processes, their abnormal homeostasis in cells is related to many diseases, such as neurodegenerative disease, cancer and diabetes. Fluorescent imaging offers a unique route to detect metal ions in cells via a contactless and damage-free way with high spatial and temporal fidelity. Consequently, it represents a promising method to advance the understanding of physiological and pathological functions of metal ions in cell biology. In this highlight article, we will discuss recent advances in fluorescent imaging of metal ions by small-molecule sensors for understanding the role of metals in related diseases. We will also discuss challenges and opportunities for the design of small-molecule sensors for fluorescent detection of cellular metal ions as a potential method for disease diagnosis.
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Affiliation(s)
- Xuhong Qian
- Shanghai Key Laboratory of Chemical Biology, State Key Laboratory of Bioreactor Engineering, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
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18
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Nakabayashi T, Ohta N. Sensing of intracellular environments by fluorescence lifetime imaging of exogenous fluorophores. ANAL SCI 2016; 31:275-85. [PMID: 25864670 DOI: 10.2116/analsci.31.275] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Fluorescence lifetime imaging (FLIM) has been recognized as a powerful microscopy technique to examine environments in living systems. The fluorescence lifetime does not depend on the photobleaching and optical conditions, which allows us to obtain quantitative information on intracellular environments by analyzing the fluorescence lifetime. A variety of exogenous fluorophores have been applied in FLIM measurements to examine cellular processes. Information on the correlation between the fluorescence lifetime and the physiological parameters is essential to elucidate the cellular environments from the fluorescence lifetime measurements of exogenous fluorophores. In this review, exogenous fluorophores used for lifetime-based sensing are summarized, with the expectation that it becomes a basis for selecting the fluorophore used to investigate the intracellular environment with FLIM. Experimental results of the intracellular sensing of pH, metal ions, oxygen, viscosity, and other physiological parameters on the basis of the FLIM measurements are described along with a brief explanation of the mechanism of the change in the fluorescence lifetime.
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James SA, Burke R, Howard DL, Spiers KM, Paterson DJ, Murphy S, Ramm G, Kirkham R, Ryan CG, de Jonge MD. Visualising coordination chemistry: fluorescence X-ray absorption near edge structure tomography. Chem Commun (Camb) 2016; 52:11834-11837. [DOI: 10.1039/c6cc06747f] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Here we develop a measurement scheme to determine the abundance, distribution, and coordination environment of biological copper complexes in situ, without need for complex sample preparation.
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Affiliation(s)
| | - R. Burke
- School of Biological Sciences
- Monash University
- Clayton 3800
- Australia
| | | | | | | | - S. Murphy
- School of Biological Sciences
- Monash University
- Clayton 3800
- Australia
| | - G. Ramm
- School of Biological Sciences
- Monash University
- Clayton 3800
- Australia
| | - R. Kirkham
- Commonwealth Science Industry Research Organisation
- Clayton 3168
- Australia
| | - C. G. Ryan
- Commonwealth Science Industry Research Organisation
- Clayton 3168
- Australia
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20
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Maret W. Analyzing free zinc(II) ion concentrations in cell biology with fluorescent chelating molecules. Metallomics 2015; 7:202-11. [PMID: 25362967 DOI: 10.1039/c4mt00230j] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Essential metal ions are tightly controlled in biological systems. An understanding of metal metabolism and homeostasis is being developed from quantitative information of the sizes, concentrations, and dynamics of cellular and subcellular metal ion pools. In the case of human zinc metabolism, minimally 24 proteins of two zinc transporter families and a dozen metallothioneins participate in cellular uptake, extrusion, and re-distribution among cellular compartments. Significantly, zinc(ii) ions are now considered signaling ions in intra- and intercellular communication. Such functions require transients of free zinc ions. It is experimentally quite challenging to distinguish zinc that is protein-bound from zinc that is not bound to proteins. Measurement of total zinc is relatively straightforward with analytical techniques such as atomic absorption/emission spectroscopy or inductively coupled plasma mass spectrometry. Total zinc concentrations of human cells are 200-300 μM. In contrast, the pool of non-protein bound zinc is mostly examined with fluorescence microscopy/spectroscopy. There are two widely applied fluorescence approaches, one employing low molecular weight chelating agents ("probes") and the other metal-binding proteins ("sensors"). The protein sensors, such as the CALWY, Zap/ZifCY, and carbonic anhydrase-based sensors, can be genetically encoded and have certain advantages in terms of controlling intracellular concentration, localization, and calibration. When employed correctly, both probes and sensors can establish qualitative differences in free zinc ion concentrations. However, when quantitative information is sought, the assumptions underlying the applications of probes and sensors must be carefully examined and even then measured pools of free zinc ions remain methodologically defined. A consensus is building that the steady-state free zinc ion concentrations in the cytosol are in the picomolar range but there is no consensus on their concentrations in subcellular compartments. Applying the extensive toolbox of available probes/sensors in biological systems requires an understanding of the principles of cellular zinc homeostasis and the chemical biology of the probes and sensors. Regardless of limitations in specificity (for a particular metal ion), selectivity (for a particular metal pool), and sensitivity (detection limit), the technology is making remarkable contributions to imaging zinc with high spatiotemporal resolution in single cells and to defining the biochemical functions of zinc ions in cellular regulation.
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Affiliation(s)
- Wolfgang Maret
- King's College London, Faculty of Life Sciences and Medicine, Division of Diabetes and Nutritional Sciences and Department of Biochemistry, Metal Metabolism Group, 150 Stamford St., London SE1 9NH, UK.
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21
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Liu J, Liu J, Liu W, Zhang H, Yang Z, Wang B, Chen F, Chen H. Triple-Emitting Dumbbell Fluorescent Nanoprobe for Multicolor Detection and Imaging Applications. Inorg Chem 2015; 54:7725-34. [DOI: 10.1021/acs.inorgchem.5b00610] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jing Liu
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Jian Liu
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Weisheng Liu
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Haoli Zhang
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Zhengyin Yang
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Baodui Wang
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Fengjuan Chen
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
and Key Laboratory of Special Function Materials and Structure Design,
Ministry of Education, Lanzhou University Gansu, Lanzhou, 730000, P. R. China
| | - Haotai Chen
- State
Key Laboratory of Veterinary Etiologic Biology, National Foot-and-Mouth
Disease Reference Laboratory of China, Lanzhou Veterinary Research
Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, P. R. China
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23
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Lee YH, Verwilst P, Park N, Lee JH, Kim JS. Organelle-selective di-(2-picolyl)amine-appended water-soluble fluorescent sensors for Cu(II): synthesis, photophysical and in vitro studies. J INCL PHENOM MACRO 2015. [DOI: 10.1007/s10847-015-0482-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Verwilst P, Sunwoo K, Kim JS. The role of copper ions in pathophysiology and fluorescent sensors for the detection thereof. Chem Commun (Camb) 2015; 51:5556-71. [DOI: 10.1039/c4cc10366a] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Copper ions are crucial to life, and some fundamental roles of copper in pathophysiology have been elucidated using fluorescent sensors.
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Affiliation(s)
- Peter Verwilst
- Department of Chemistry
- Korea Univesity
- Seoul 136-701
- Korea
| | - Kyoung Sunwoo
- Department of Chemistry
- Korea Univesity
- Seoul 136-701
- Korea
| | - Jong Seung Kim
- Department of Chemistry
- Korea Univesity
- Seoul 136-701
- Korea
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25
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Young TR, Wijekoon CJK, Spyrou B, Donnelly PS, Wedd AG, Xiao Z. A set of robust fluorescent peptide probes for quantification of Cu(ii) binding affinities in the micromolar to femtomolar range. Metallomics 2015; 7:567-78. [DOI: 10.1039/c4mt00301b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A set of four fluorescent probes were developed and demonstrated to be capable of quantifying Cu(ii) binding affinities in the micromolar to femtomolar range and exploring Cu(ii) binding ligands in peptides and proteins.
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Affiliation(s)
- Tessa R. Young
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Chathuri J. K. Wijekoon
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Benjamin Spyrou
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Paul S. Donnelly
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Anthony G. Wedd
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Zhiguang Xiao
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
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Migocka M, Papierniak A, Maciaszczyk-Dziubińska E, Poździk P, Posyniak E, Garbiec A, Filleur S. Cucumber metal transport protein MTP8 confers increased tolerance to manganese when expressed in yeast and Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:5367-84. [PMID: 25039075 PMCID: PMC4400539 DOI: 10.1093/jxb/eru295] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Cation diffusion facilitator (CDF) proteins are ubiquitous divalent cation transporters that have been proved to be essential for metal homeostasis and tolerance in Archaebacteria, Bacteria, and Eukaryota. In plants, CDFs are designated as metal tolerance proteins (MTPs). Due to the lack of genomic resources, studies on MTPs in other plants, including cultivated crops, are lacking. Here, the identification and organization of genes encoding members of the MTP family in cucumber are described. The first functional characterization of a cucumber gene encoding a member of the Mn-CDF subgroup of CDF proteins, designated as CsMTP8 based on the highest homology to plant MTP8, is also presented. The expression of CsMTP8 in Saccharomyces cerevisiae led to increased Mn accumulation in yeast cells and fully restored the growth of mutants hypersensitive to Mn in Mn excess. Similarly, the overexpression of CsMTP8 in Arabidopsis thaliana enhanced plant tolerance to high Mn in nutrition media as well as the accumulation of Mn in plant tissues. When fused to green fluorescent protein (GFP), CsMTP8 localized to the vacuolar membranes in yeast cells and to Arabidopsis protoplasts. In cucumber, CsMTP8 was expressed almost exclusively in roots, and the level of gene transcript was markedly up-regulated or reduced under elevated Mn or Mn deficiency, respectively. Taken together, the results suggest that CsMTP8 is an Mn transporter localized in the vacuolar membrane, which participates in the maintenance of Mn homeostasis in cucumber root cells.
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Affiliation(s)
- Magdalena Migocka
- Wrocław University, Institute of Experimental Biology, Department of Molecular Plant Physiology, Kanonia 6/8, 50-328 Wrocław, Poland
| | - Anna Papierniak
- Wrocław University, Institute of Experimental Biology, Department of Molecular Plant Physiology, Kanonia 6/8, 50-328 Wrocław, Poland
| | - Ewa Maciaszczyk-Dziubińska
- Wrocław University, Institute of Experimental Biology, Department of Genetics and Cell Physiology, Kanonia 6/8, 50-328 Wrocław, Poland
| | - Piotr Poździk
- Wrocław University, Institute of Experimental Biology, Department of Molecular Plant Physiology, Kanonia 6/8, 50-328 Wrocław, Poland
| | - Ewelina Posyniak
- Wrocław University, Institute of Experimental Biology, Department of Molecular Plant Physiology, Kanonia 6/8, 50-328 Wrocław, Poland
| | - Arnold Garbiec
- Wrocław University, Institute of Experimental Biology, Department of Animal Developmental Biology, Sienkiewicza 21, 50-335 Wrocław, Poland
| | - Sophie Filleur
- Institut des Sciences du Végétal, CNRS, 1 Avenue de la Terrasse, Saclay Plant Sciences Labex, 91198 Gif-Sur-Yvette Cedex, France Université Paris 7-Denis Diderot, UFR Sciences du Vivant, Saclay Plant Sciences Labex, 91198 Gif-Sur-Yvette Cedex, France
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27
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Li M, Ge H, Arrowsmith RL, Mirabello V, Botchway SW, Zhu W, Pascu SI, James TD. Ditopic boronic acid and imine-based naphthalimide fluorescence sensor for copper(ii). Chem Commun (Camb) 2014; 50:11806-9. [DOI: 10.1039/c4cc03453h] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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