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Li K, Tong YJ, Liu Q, Peng S, Gong X, Wang D, Gong Z. Site-recognition boosted the sensing performance of terbium-based organic frameworks for UO 22+ detection. Chem Commun (Camb) 2024; 60:6913-6916. [PMID: 38881424 DOI: 10.1039/d4cc01758g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
A unique fluorescent sensing probe for UO22+ detection was fabricated with terbium-based metal organic frameworks via introducing specific recognition sites (denoted as Tb-TDPAT). The newly formed Tb-TDPAT presented remarkable detection sensitivity and selectivity towards UO22+, surpassing the need for complex post-modification methods.
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Affiliation(s)
- Kexuan Li
- School of Chemistry, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Yuan-Jun Tong
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
| | - Qian Liu
- School of Chemistry, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Shiyu Peng
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
| | - Xinying Gong
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
| | - Dongmei Wang
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
| | - Zhengjun Gong
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
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2
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Pardoux R, Sauge-Merle S, Bremond N, Beccia MR, Lemaire D, Battesti C, Delangle P, Solari PL, Guilbaud P, Berthomieu C. Optimized Coordination of Uranyl in Engineered Calmodulin Site 1 Provides a Subnanomolar Affinity for Uranyl and a Strong Uranyl versus Calcium Selectivity. Inorg Chem 2022; 61:20480-20492. [DOI: 10.1021/acs.inorgchem.2c03185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Romain Pardoux
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - Sandrine Sauge-Merle
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - Nicolas Bremond
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - Maria Rosa Beccia
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - David Lemaire
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - Christine Battesti
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
| | - Pascale Delangle
- Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SyMMES, 38000Grenoble, France
| | - Pier Lorenzo Solari
- MARS beamline, Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, 91192Gif-sur-Yvette Cedex, France
| | | | - Catherine Berthomieu
- Aix Marseille Univ, CEA, CNRS, UMR 7265, BIAM, Interactions Protéine Métal, 13108Saint Paul-Lez-Durance, France
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3
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Inter-Site Cooperativity of Calmodulin N-Terminal Domain and Phosphorylation Synergistically Improve the Affinity and Selectivity for Uranyl. Biomolecules 2022; 12:biom12111703. [DOI: 10.3390/biom12111703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/10/2022] [Accepted: 11/12/2022] [Indexed: 11/19/2022] Open
Abstract
Uranyl–protein interactions participate in uranyl trafficking or toxicity to cells. In addition to their qualitative identification, thermodynamic data are needed to predict predominant mechanisms that they mediate in vivo. We previously showed that uranyl can substitute calcium at the canonical EF-hand binding motif of calmodulin (CaM) site I. Here, we investigate thermodynamic properties of uranyl interaction with site II and with the whole CaM N-terminal domain by spectrofluorimetry and ITC. Site II has an affinity for uranyl about 10 times lower than site I. Uranyl binding at site I is exothermic with a large enthalpic contribution, while for site II, the enthalpic contribution to the Gibbs free energy of binding is about 10 times lower than the entropic term. For the N–terminal domain, macroscopic binding constants for uranyl are two to three orders of magnitude higher than for calcium. A positive cooperative process driven by entropy increases the second uranyl-binding event as compared with the first one, with ΔΔG = −2.0 ± 0.4 kJ mol−1, vs. ΔΔG = −6.1 ± 0.1 kJ mol−1 for calcium. Site I phosphorylation largely increases both site I and site II affinity for uranyl and uranyl-binding cooperativity. Combining site I phosphorylation and site II Thr7Trp mutation leads to picomolar dissociation constants Kd1 = 1.7 ± 0.3 pM and Kd2 = 196 ± 21 pM at pH 7. A structural model obtained by MD simulations suggests a structural role of site I phosphorylation in the affinity modulation.
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Ma M, Wang R, Xu L, Xu M, Liu S. Emerging health risks and underlying toxicological mechanisms of uranium contamination: Lessons from the past two decades. ENVIRONMENT INTERNATIONAL 2020; 145:106107. [PMID: 32932066 DOI: 10.1016/j.envint.2020.106107] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/28/2020] [Accepted: 08/30/2020] [Indexed: 06/11/2023]
Abstract
Uranium contamination is a global health concern. Regarding natural or anthropogenic uranium contamination, the major sources of concern are groundwater, mining, phosphate fertilizers, nuclear facilities, and military activities. Many epidemiological and laboratory studies have demonstrated that environmental and occupational uranium exposure can induce multifarious health problems. Uranium exposure may cause health risks because of its chemotoxicity and radiotoxicity in natural or anthropogenic scenarios: the former is generally thought to play a more significant role with regard to the natural uranium exposure, and the latter is more relevant to enriched uranium exposure. The understanding of the health risks and underlying toxicological mechanisms of uranium remains at a preliminary stage, and many controversial findings require further research. In order to present state-of-the-art status in this field, this review will primarily focus on the chemotoxicity of uranium, rather than its radiotoxicity, as well as the involved toxicological mechanisms. First, the natural or anthropogenic uranium contamination scenarios will be briefly summarized. Second, the health risks upon natural uranium exposure, for example, nephrotoxicity, bone toxicity, reproductive toxicity, hepatotoxicity, neurotoxicity, and pulmonary toxicity, will be discussed based on the reported epidemiological cases and laboratory studies. Third, the recent advances regarding the toxicological mechanisms of uranium-induced chemotoxicity will be highlighted, including oxidative stress, genetic damage, protein impairment, inflammation, and metabolic disorder. Finally, the gaps and challenges in the knowledge of uranium-induced chemotoxicity and underlying mechanisms will be discussed.
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Affiliation(s)
- Minghao Ma
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruixia Wang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lining Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ming Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Sijin Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
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5
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Lin YW. Uranyl Binding to Proteins and Structural-Functional Impacts. Biomolecules 2020; 10:biom10030457. [PMID: 32187982 PMCID: PMC7175365 DOI: 10.3390/biom10030457] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 03/08/2020] [Accepted: 03/13/2020] [Indexed: 01/29/2023] Open
Abstract
The widespread use of uranium for civilian purposes causes a worldwide concern of its threat to human health due to the long-lived radioactivity of uranium and the high toxicity of uranyl ion (UO22+). Although uranyl–protein/DNA interactions have been known for decades, fewer advances are made in understanding their structural-functional impacts. Instead of focusing only on the structural information, this article aims to review the recent advances in understanding the binding of uranyl to proteins in either potential, native, or artificial metal-binding sites, and the structural-functional impacts of uranyl–protein interactions, such as inducing conformational changes and disrupting protein-protein/DNA/ligand interactions. Photo-induced protein/DNA cleavages, as well as other impacts, are also highlighted. These advances shed light on the structure-function relationship of proteins, especially for metalloproteins, as impacted by uranyl–protein interactions. It is desired to seek approaches for biological remediation of uranyl ions, and ultimately make a full use of the double-edged sword of uranium.
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Affiliation(s)
- Ying-Wu Lin
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China; ; Tel.: +86-734-8578079
- Laboratory of Protein Structure and Function, University of South China, Hengyang 421001, China
- Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang 421001, China
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Garai A, Delangle P. Recent advances in uranyl binding in proteins thanks to biomimetic peptides. J Inorg Biochem 2019; 203:110936. [PMID: 31864150 DOI: 10.1016/j.jinorgbio.2019.110936] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 11/05/2019] [Accepted: 11/17/2019] [Indexed: 12/29/2022]
Abstract
Uranium is an element belonging to the actinide series. It is ubiquitous in rock, soil, and water. Uranium is found in the ecosystem due to mining and milling industrial activities and processing to nuclear fuel, but also to the extensive use of phosphate fertilizers. Understanding uranium binding in vivo is critical, first to deepen our knowledge of molecular events leading to chemical toxicity, but also to provide new mechanistic information useful for the development of efficient decorporation treatments to be applied in case of intoxication. The most stable form in physiological conditions is the uranyl cation (UO22+), in which uranium oxidation state is +VI. This short review presents uranyl coordination properties and chelation, and what is currently known about uranium binding to proteins. Although several target proteins have been identified, the UO22+ binding sites have barely been identified. Biomimetic approaches using model peptides are good options to shed light on high affinity uranyl binding sites in proteins. A strategy based on constrained cyclodecapeptides allowed recently to propose a tetraphosphate binding site for uranyl that provides an affinity similar to the one measured with the phosphoprotein osteopontin.
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Affiliation(s)
- Aditya Garai
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000 Grenoble, France
| | - Pascale Delangle
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, F-38000 Grenoble, France.
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Phosphorus Localization and Its Involvement in the Formation of Concentrated Uranium in the Renal Proximal Tubules of Rats Exposed to Uranyl Acetate. Int J Mol Sci 2019; 20:ijms20194677. [PMID: 31547201 PMCID: PMC6801556 DOI: 10.3390/ijms20194677] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 09/13/2019] [Accepted: 09/18/2019] [Indexed: 02/06/2023] Open
Abstract
Although the kidneys comprise a critical target of uranium exposure, the dynamics of renal uranium distribution have remained obscure. Uranium is considered to function physiologically in the form of uranyl ions that have high affinity for phosphate groups. The present study applied microbeam-based elemental analysis to precisely determine the distribution of phosphorus and uranium in the kidneys of male Wistar rats exposed to uranium. One day after a single subcutaneous injection of uranyl acetate (2 mg/kg), areas of concentrated phosphorus were scattered in the S3 segments of the proximal tubule of the kidneys, whereas the S3 segments in control rats and in rats given a lower dose of uranium (0.5 mg/kg) contained phosphorus without concentrated phosphorus. Areas with concentrated phosphorus contained uranium 4- to 14-fold more than the mean uranium concentration (126–472 vs. 33.1 ± 4.6 μg/g). The chemical form of uranium in the concentrated phosphorus examined by XAFS was uranium (VI), suggesting that the interaction of uranyl ions with the phosphate groups of biomolecules could be involved in the formation of uranium concentration in the proximal tubules of kidneys in rats exposed to uranium.
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Creff G, Zurita C, Jeanson A, Carle G, Vidaud C, Den Auwer C. What do we know about actinides-proteins interactions? RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3120] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Abstract
Since the early 40s when the first research related to the development of the atomic bomb began for the Manhattan Project, actinides (An) and their association with the use of nuclear energy for civil applications, such as in the generation of electricity, have been a constant source of interest and fear. In 1962, the first Society of Toxicology (SOT), led by H. Hodge, was established at the University of Rochester (USA). It was commissioned as part of the Manhattan Project to assess the impact of nuclear weapons production on workers’ health. As a result of this initiative, the retention and excretion rates of radioactive heavy metals, their physiological impact in the event of acute exposure and their main biological targets were assessed. In this context, the scientific community began to focus on the role of proteins in the transportation and in vivo accumulation of An. The first studies focused on the identification of these proteins. Thereafter, the continuous development of physico-chemical characterization techniques has made it possible to go further and specify the modes of interaction with proteins from both a thermodynamic and structural point of view, as well as from the point of view of their biological activity. This article reviews the work performed in this area since the Manhattan Project. It is divided into three parts: first, the identification of the most affine proteins; second, the study of the affinity and structure of protein-An complexes; and third, the impact of actinide ligation on protein conformation and function.
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Affiliation(s)
- Gaëlle Creff
- Université Côte d’Azur, CNRS, UMR 7272, Institut de Chimie de Nice , 06108 Nice , France
| | - Cyril Zurita
- Université Côte d’Azur, CNRS, UMR 7272, Institut de Chimie de Nice , 06108 Nice , France
| | - Aurélie Jeanson
- Université Côte d’Azur, CNRS, UMR 7272, Institut de Chimie de Nice , 06108 Nice , France
| | - Georges Carle
- Université Côte d’Azur, CEA, UMR E-4320 TIRO-MATOs , 06100 Nice , France
| | - Claude Vidaud
- CEA DRF, CNRS, UMR 7265, Institut de Biosciences et Biotechnologies d’Aix-Marseille , 13108 Saint-Paul-lez-Durance , France
| | - Christophe Den Auwer
- Université Côte d’Azur, CNRS, UMR 7272, Institut de Chimie de Nice , 06108 Nice , France
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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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Barkleit A, Hennig C, Ikeda-Ohno A. Interaction of Uranium(VI) with α-Amylase and Its Implication for Enzyme Activity. Chem Res Toxicol 2018; 31:1032-1041. [DOI: 10.1021/acs.chemrestox.8b00106] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Astrid Barkleit
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Christoph Hennig
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Atsushi Ikeda-Ohno
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
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11
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Carugo O. Structural features of uranium-protein complexes. J Inorg Biochem 2018; 189:1-6. [PMID: 30149122 DOI: 10.1016/j.jinorgbio.2018.08.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 06/19/2018] [Accepted: 08/16/2018] [Indexed: 02/06/2023]
Abstract
Uranium toxicity depends on its chemical properties rather than on its radioactivity and involves its interaction with macromolecules. Here, a systematic survey of the structural features of the uranyl sites observed in protein crystal structures deposited in the Protein Data Bank is reported. Beside the two uranyl oxygens, which occupy the axial positions, uranium tends to be coordinated by five other oxygen atoms, which occupy the equatorial vertices of a pentagonal bipyramid. Even if one or more of these equatorial positions are sometime empty, they can be occupied only by oxygen atoms that belong to the carboxylate groups of Glu and Asp side-chains, usually acting as monodentate ligands, to water molecules, or to acetate anions. Although several uranium sites appear undefined or unrefined, with a single uranium atom that lacks the two uranyl oxygen atoms, this problem seems to become less frequent in recent years. However, it is clear that the crystallographic refinements of the uranyl sites are not always well restrained and a better parametrization of these restraints seems to be necessary.
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Affiliation(s)
- Oliviero Carugo
- Chemistry Department, University of Pavia, Italy; Department of Structural and Computational Biology, University of Vienna, Austria.
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12
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Starck M, Laporte FA, Oros S, Sisommay N, Gathu V, Solari PL, Creff G, Roques J, Den Auwer C, Lebrun C, Delangle P. Cyclic Phosphopeptides to Rationalize the Role of Phosphoamino Acids in Uranyl Binding to Biological Targets. Chemistry 2017; 23:5281-5290. [PMID: 28164389 DOI: 10.1002/chem.201605481] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Indexed: 12/24/2022]
Abstract
The specific molecular interactions responsible for uranium toxicity are not yet understood. The uranyl binding sites in high-affinity target proteins have not been identified yet and the involvement of phosphoamino acids is still an important question. Short cyclic peptide sequences, with three glutamic acids and one phosphoamino acid, are used as simple models to mimic metal binding sites in phosphoproteins and to help understand the mechanisms involved in uranium toxicity. A combination of peptide design and synthesis, analytical chemistry, extended X-ray absorption fine structure (EXAFS) spectroscopy, and DFT calculations demonstrates the involvement of the phosphate group in the uranyl coordination sphere together with the three carboxylates of the glutamate moieties. The affinity constants measured with a reliable analytical competitive approach at physiological pH are significantly enhanced owing to the presence of the phosphorous moiety. These findings corroborate the importance of phosphoamino acids in uranyl binding in proteins and the relevance of considering phosphoproteins as potential uranyl targets in vivo.
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Affiliation(s)
- Matthieu Starck
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Fanny A Laporte
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Stephane Oros
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Nathalie Sisommay
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Vicky Gathu
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Pier Lorenzo Solari
- Synchrotron SOLEIL, L'orme des Merisiers, Saint-Aubin, 91192, Gif-sur-Yvette, France
| | - Gaëlle Creff
- Institut de Chimie de Nice, UMR7272, Université Côte d'Azur, 06108, Nice, France
| | - Jérôme Roques
- Institut de Physique Nucléaire d'Orsay, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, France
| | - Christophe Den Auwer
- Institut de Chimie de Nice, UMR7272, Université Côte d'Azur, 06108, Nice, France
| | - Colette Lebrun
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
| | - Pascale Delangle
- INAC/SyMMES, UMR5819, Université Grenoble Alpes, CEA, CNRS, 38000, Grenoble, France
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13
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Park DM, Overton KW, Liou MJ, Jiao Y. Identification of a U/Zn/Cu responsive global regulatory two-component system in Caulobacter crescentus. Mol Microbiol 2017; 104:46-64. [PMID: 28035693 DOI: 10.1111/mmi.13615] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/23/2016] [Indexed: 01/18/2023]
Abstract
Despite the well-known toxicity of uranium (U) to bacteria, little is known about how cells sense and respond to U. The recent finding of a U-specific stress response in Caulobacter crescentus has provided a foundation for studying the mechanisms of U- perception in bacteria. To gain insight into this process, we used a forward genetic screen to identify the regulatory components governing expression of the urcA promoter (PurcA ) that is strongly induced by U. This approach unearthed a previously uncharacterized two-component system, named UzcRS, which is responsible for U-dependent activation of PurcA . UzcRS is also highly responsive to zinc and copper, revealing a broader specificity than previously thought. Using ChIP-seq, we found that UzcR binds extensively throughout the genome in a metal-dependent manner and recognizes a noncanonical DNA-binding site. Coupling the genome-wide occupancy data with RNA-seq analysis revealed that UzcR is a global regulator of transcription, predominately activating genes encoding proteins that are localized to the cell envelope; these include metallopeptidases, multidrug-resistant efflux (MDR) pumps, TonB-dependent receptors and many proteins of unknown function. Collectively, our data suggest that UzcRS couples the perception of U, Zn and Cu with a novel extracytoplasmic stress response.
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Affiliation(s)
- Dan M Park
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - K Wesley Overton
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Megan J Liou
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Yongqin Jiao
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
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14
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Ameziane-Le Hir S, Bourgeois D, Basset C, Hagège A, Vidaud C. Reactivity of U-associated osteopontin with lactoferrin: a one-to-many complex. Metallomics 2017; 9:865-875. [DOI: 10.1039/c7mt00087a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A highly-simplified scenario of LF/U-fOPN interaction. The U content of the U-fOPN complexes refers to the CE-ICP/MS experiments.
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Affiliation(s)
| | | | - Christian Basset
- CEA
- DRF
- Biosciences and Biotechnologies Institute (BIAM)
- Bagnols-sur-Cèze
- France
| | - Agnès Hagège
- Univ Lyon
- CNRS
- Université Claude Bernard Lyon 1
- Ens de Lyon
- Institut des Sciences Analytiques
| | - Claude Vidaud
- CEA
- DRF
- Biosciences and Biotechnologies Institute (BIAM)
- Bagnols-sur-Cèze
- France
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15
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Gombeau K, Pereira S, Ravanat JL, Camilleri V, Cavalie I, Bourdineaud JP, Adam-Guillermin C. Depleted uranium induces sex- and tissue-specific methylation patterns in adult zebrafish. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 154:25-33. [PMID: 26829549 DOI: 10.1016/j.jenvrad.2016.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 12/15/2015] [Accepted: 01/09/2016] [Indexed: 06/05/2023]
Abstract
We examined the effects of chronic exposure to different concentrations (2 and 20 μg L(-)(1)) of environmentally relevant waterborne depleted uranium (DU) on the DNA methylation patterns both at HpaII restriction sites (5'-CCGG-3') and across the whole genome in the zebrafish brain, gonads, and eyes. We first identified sex-dependent differences in the methylation level of HpaII sites after exposure. In males, these effects were present as early as 7 days after exposure to 20 μg L(-)(1) DU, and were even more pronounced in the brain, gonads, and eyes after 24 days. However, in females, hypomethylation was only observed in the gonads after exposure to 20 μg L(-)(1) DU for 24 days. Sex-specific effects of DU were also apparent at the whole-genome level, because in males, exposure to 20 μg L(-)(1) DU for 24 days resulted in cytosine hypermethylation in the brain and eyes and hypomethylation in the gonads. In contrast, in females, hypermethylation was observed in the brain after exposure to both concentrations of DU for 7 days. Based on our current knowledge of uranium toxicity, several hypotheses are proposed to explain these findings, including the involvement of oxidative stress, alteration of demethylation enzymes and the calcium signaling pathway. This study reports, for the first time, the sex- and tissue-specific epigenetic changes that occur in a nonhuman organism after exposure to environmentally relevant concentrations of uranium, which could induce transgenerational epigenetic effects.
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Affiliation(s)
- Kewin Gombeau
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LECO, Cadarache, Saint-Paul-lez-Durance, 13115, France
| | - Sandrine Pereira
- Neolys Diagnostics, Centre Léon Bérard, Bât Cheney A, 69008 LYON, France
| | - Jean-Luc Ravanat
- Univ. Grenoble Alpes, INAC-SCIB, 38000 Grenoble, France; CEA, INAC-SCIB Laboratoire des Lésions des Acides Nucléiques, 38000 Grenoble, France
| | - Virginie Camilleri
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LECO, Cadarache, Saint-Paul-lez-Durance, 13115, France
| | - Isabelle Cavalie
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LECO, Cadarache, Saint-Paul-lez-Durance, 13115, France
| | | | - Christelle Adam-Guillermin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LECO, Cadarache, Saint-Paul-lez-Durance, 13115, France.
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16
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Starck M, Sisommay N, Laporte FA, Oros S, Lebrun C, Delangle P. Preorganized Peptide Scaffolds as Mimics of Phosphorylated Proteins Binding Sites with a High Affinity for Uranyl. Inorg Chem 2015; 54:11557-62. [PMID: 26583259 DOI: 10.1021/acs.inorgchem.5b02249] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Cyclic peptides with two phosphoserines and two glutamic acids were developed to mimic high-affinity binding sites for uranyl found in proteins such as osteopontin, which is believed to be a privileged target of this ion in vivo. These peptides adopt a β-sheet structure that allows the coordination of the latter amino acid side chains in the equatorial plane of the dioxo uranyl cation. Complementary spectroscopic and analytical methods revealed that these cyclic peptides are efficient uranyl chelating peptides with a large contribution from the phosphorylated residues. The conditional affinity constants were measured by following fluorescence tryptophan quenching and are larger than 10(10) at physiological pH. These compounds are therefore promising models for understanding uranyl chelation by proteins, which is relevant to this actinide ion toxicity.
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Affiliation(s)
- Matthieu Starck
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
| | - Nathalie Sisommay
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
| | - Fanny A Laporte
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
| | - Stéphane Oros
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
| | - Colette Lebrun
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
| | - Pascale Delangle
- Université Grenoble Alpes , INAC-SCIB, F-38000 Grenoble, France.,CEA , INAC-SCIB, F-38000 Grenoble, France
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17
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Szyrwiel Ł, Liauchuk V, Chavatte L, Lobinski R. In vitro induction and proteomics characterisation of a uranyl-protein interaction network in bovine serum. Metallomics 2015; 7:1604-11. [PMID: 26506398 DOI: 10.1039/c5mt00207a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Uranyl ions (UO2(2+)) were shown to interact with a number of foetal serum proteins, leading to the formation of a complex that could be isolated by ultracentrifugation. The molecular weight of the complex was estimated based on size-exclusion chromatography as 650 000 Da. Online ICP AES detection indicated that UO2(2+) in the complex co-eluted with minor amounts of calcium and phosphorous, but not with magnesium. A 1D gel electrophoresis of the U-complex produced more than 10 bands of similar intensity compared with only 2-3 intense bands corresponding to the main serum proteins in the control serum, indicative of the specific interaction of UO2(2+) with minor proteins. A proteomics approach allowed for the identification of 74 proteins in the complex. Analysis of the protein-protein interaction network in the UO2(2+) complex identified 32 proteins responsible for protein-protein complex formation and 34 with demonstrated ion-binding function, suggesting that UO2(2+) stimulates the formation of protein functional networks rather than using a particular molecule as its target.
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Affiliation(s)
- Łukasz Szyrwiel
- CNRS/UPPA, LCABIE, UMR5254, Hélioparc, 2, av. Pr. Angot, F-64053 Pau, France.
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18
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Burbank KA, Walker RA, Peyton BM. A molecular level mechanism for uranium (VI) toxicity through Ca2+ displacement in pyrroloquinoline quinone-dependent bacterial dehydrogenase. J Inorg Biochem 2015; 149:59-67. [DOI: 10.1016/j.jinorgbio.2014.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 11/24/2014] [Accepted: 11/25/2014] [Indexed: 11/30/2022]
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19
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Homma-Takeda S, Kitahara K, Suzuki K, Blyth BJ, Suya N, Konishi T, Terada Y, Shimada Y. Cellular localization of uranium in the renal proximal tubules during acute renal uranium toxicity. J Appl Toxicol 2015; 35:1594-600. [PMID: 25772475 DOI: 10.1002/jat.3126] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 12/18/2014] [Accepted: 12/22/2014] [Indexed: 11/07/2022]
Abstract
Renal toxicity is a hallmark of uranium exposure, with uranium accumulating specifically in the S3 segment of the proximal tubules causing tubular damage. As the distribution, concentration and dynamics of accumulated uranium at the cellular level is not well understood, here, we report on high-resolution quantitative in situ measurements by high-energy synchrotron radiation X-ray fluorescence analysis in renal sections from a rat model of uranium-induced acute renal toxicity. One day after subcutaneous administration of uranium acetate to male Wistar rats at a dose of 0.5 mg uranium kg(-1) body weight, uranium concentration in the S3 segment of the proximal tubules was 64.9 ± 18.2 µg g(-1) , sevenfold higher than the mean renal uranium concentration (9.7 ± 2.4 µg g(-1) ). Uranium distributed into the epithelium of the S3 segment of the proximal tubules and highly concentrated uranium (50-fold above mean renal concentration) in micro-regions was found near the nuclei. These uranium levels were maintained up to 8 days post-administration, despite more rapid reductions in mean renal concentration. Two weeks after uranium administration, damaged areas were filled with regenerating tubules and morphological signs of tissue recovery, but areas of high uranium concentration (100-fold above mean renal concentration) were still found in the epithelium of regenerating tubules. These data indicate that site-specific accumulation of uranium in micro-regions of the S3 segment of the proximal tubules and retention of uranium in concentrated areas during recovery are characteristics of uranium behavior in the kidney.
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Affiliation(s)
- Shino Homma-Takeda
- Research Center for Radiation Protection,Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
| | - Keisuke Kitahara
- Graduate School of Science, Chiba University, Yayoi-cho, Chiba, Japan
| | - Kyoko Suzuki
- Research Center for Radiation Protection,Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
- Graduate School of Agriculture and life Sciences, University of Tokyo, Hongo, Tokyo, Japan
| | - Benjamin J Blyth
- Research Center for Radiation Protection,Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
| | - Noriyoshi Suya
- Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
| | - Teruaki Konishi
- Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
| | - Yasuko Terada
- Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo, Japan
| | - Yoshiya Shimada
- Research Center for Radiation Protection,Research, Development and Support Center, National Institute of Radiological Sciences, Inage-ku Chiba, Japan
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20
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Yang CT, Han J, Gu M, Liu J, Li Y, Huang Z, Yu HZ, Hu S, Wang X. Fluorescent recognition of uranyl ions by a phosphorylated cyclic peptide. Chem Commun (Camb) 2015; 51:11769-72. [DOI: 10.1039/c5cc04112k] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Fluorescent recognition of uranyl ions was achieved using a phosphorylated cyclic peptide, which can be used as a fluorescent sensor.
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Affiliation(s)
- Chu-Ting Yang
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Jun Han
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Mei Gu
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Jun Liu
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Yi Li
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Zeng Huang
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Hai-Zhu Yu
- Department of Chemistry and Center for Atomic Engineering of Advanced Materials
- Anhui University
- Hefei
- P. R. China
| | - Sheng Hu
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
| | - Xiaolin Wang
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang
- P. R. China
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21
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Lebrun C, Starck M, Gathu V, Chenavier Y, Delangle P. Engineering Short Peptide Sequences for Uranyl Binding. Chemistry 2014; 20:16566-73. [DOI: 10.1002/chem.201404546] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Indexed: 01/16/2023]
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22
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Xu M, Frelon S, Simon O, Lobinski R, Mounicou S. Development of a non-denaturing 2D gel electrophoresis protocol for screening in vivo uranium-protein targets in Procambarus clarkii with laser ablation ICP MS followed by protein identification by HPLC-Orbitrap MS. Talanta 2014; 128:187-95. [PMID: 25059147 DOI: 10.1016/j.talanta.2014.04.065] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 04/19/2014] [Accepted: 04/23/2014] [Indexed: 01/23/2023]
Abstract
Limited knowledge about in vivo non-covalent uranium (U)-protein complexes is largely due to the lack of appropriate analytical methodology. Here, a method for screening and identifying the molecular targets of U was developed. The approach was based on non-denaturing 1D and 2D gel electrophoresis (ND-PAGE and ND-2D-PAGE (using ND-IEF as first dimension previously described)) in conjunction with laser ablation inductively coupled plasma mass spectrometry (LA-ICP MS) for the detection of U-containing proteins. The proteins were then identified by µbore HPLC-Orbitrap MS/MS. The method was applied to the analysis of cytosol of hepatopancreas (HP) of a model U-bioaccumulating organism (Procambarus clarkii). The imaging of uranium in 2D gels revealed the presence of 11 U-containing protein spots. Six protein candidates (i.e. ferritin, glyceraldehyde-3-phosphate dehydrogenase, triosephosphate isomerase, cytosolic manganese superoxide dismutase (Mn-SOD), glutathione S transferase D1 and H3 histone family protein) were then identified by matching with the data base of crustacea Decapoda species (e.g. crayfish). Among them, ferritin was the most important one. This strategy is expected to provide an insight into U toxicology and metabolism.
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Affiliation(s)
- Ming Xu
- LCABIE - UMR5254, Technopôle Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Sandrine Frelon
- IRSN/PRP-ENV/SERIS - Laboratoire de Biogéochimie, Biodisponibilité et Transferts des radionucléides, BP3, 13115 St. Paul-lez Durance Cedex, France
| | - Olivier Simon
- IRSN/PRP-ENV/SERIS - Laboratoire de Biogéochimie, Biodisponibilité et Transferts des radionucléides, BP3, 13115 St. Paul-lez Durance Cedex, France
| | - Ryszard Lobinski
- LCABIE - UMR5254, Technopôle Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Sandra Mounicou
- LCABIE - UMR5254, Technopôle Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 Pau Cedex 09, France.
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23
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24
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Sun MH, Liu SQ, Du KJ, Nie CM, Lin YW. A spectroscopic study of uranyl-cytochrome b5/cytochrome c interactions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:130-137. [PMID: 24051281 DOI: 10.1016/j.saa.2013.08.112] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 08/28/2013] [Accepted: 08/28/2013] [Indexed: 06/02/2023]
Abstract
Uranium is harmful to human health due to its radiation damage and the ability of uranyl ion (UO2(2+)) to interact with various proteins and disturb their biological functions. Cytochrome b5 (cyt b5) is a highly negatively charged heme protein and plays a key role in mediating cytochrome c (cyt c) signaling in apoptosis by forming a dynamic cyt b5-cyt c complex. In previous molecular modeling study in combination with UV-Vis studies, we found that UO2(2+) is capable of binding to cyt b5 at surface residues, Glu37 and Glu43. In this study, we further investigated the structural consequences of cyt b5 and cyt c, as well as cyt b5-cyt c complex, upon uranyl binding, by fluorescence spectroscopic and circular dichroism techniques. Moreover, we proposed a uranyl binding site for cyt c at surface residues, Glu66 and Glu69, by performing a molecular modeling study. It was shown that uranyl binds to cyt b5 (KD=10 μM), cyt c (KD=87 μM), and cyt b5-cyt c complex (KD=30 μM) with a different affinity, which slightly alters the protein conformation and disturbs the interaction of cyt b5-cyt c complex. Additionally, we investigated the functional consequences of uranyl binding to the protein surface, which decreases the inherent peroxidase activity of cyt c. The information of uranyl-cyt b5/cyt c interactions gained in this study likely provides a clue for the mechanism of uranyl toxicity.
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Affiliation(s)
- Mei-Hui Sun
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
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25
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Faucher K, Floriani M, Gilbin R, Adam-Guillermin C. Uranium-induced sensory alterations in the zebrafish Danio rerio. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 124-125:94-105. [PMID: 22940224 DOI: 10.1016/j.aquatox.2012.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 07/31/2012] [Accepted: 08/02/2012] [Indexed: 06/01/2023]
Abstract
The effect of chronic exposure to uranium ions (UO(2)(2+)) on sensory tissues including the olfactory and lateral line systems was investigated in zebrafish (Danio rerio) using scanning electron microscopy. The aim of this study was to determine whether exposure to uranium damaged sensory tissues in fish. The fish were exposed to uranium at the concentration of 250 μg l(-1) for 10 days followed by a depuration period of 23 days. Measurements of uranium uptake in different fish organs: olfactory rosettes and bulbs, brain, skin, and muscles, were also determined by ICP-AES and ICP-MS during the entire experimental period. The results showed that uranium displayed a strong affinity for sensory structures in direct contact with the surrounding medium, such as the olfactory and lateral line systems distributed on the skin. A decreasing gradient of uranium concentration was found: olfactory rosettes>olfactory bulbs>skin>muscles>brain. At the end of the experiment, uranium was present in non-negligible quantities in sensory tissues. In parallel, fish exposed to uranium showed severe sensory tissue alterations at the level of the olfactory and lateral line systems. In both sensory systems, the gross morphology was altered and the sensory hair cells were significantly damaged very early after the initiation of exposure (from the 3rd day). At the end of the experiment, after 23 days of depuration, the lateral line system still displayed slight tissue alterations, but approximately 80% of the neuromasts in this system had regenerated. In contrast, the olfactory system took more time to recover, as more than half of the olfactory rosettes observed remained destroyed at the end of the experiment. This study showed, for the first time, that uranium is able to damage fish sensory tissues to such an extent that tissue regeneration is delayed.
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Affiliation(s)
- K Faucher
- Laboratoire d'écotoxicologie des radionucléides (LECO), Institut de Radioprotection et Sûreté Nucléaire, Centre de Cadarache, Saint Paul lez Durance, France.
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26
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Grasso G, Spoto G. Plasmonics for the study of metal ion–protein interactions. Anal Bioanal Chem 2012; 405:1833-43. [DOI: 10.1007/s00216-012-6421-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 09/10/2012] [Accepted: 09/12/2012] [Indexed: 12/19/2022]
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27
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Pardoux R, Sauge-Merle S, Lemaire D, Delangle P, Guilloreau L, Adriano JM, Berthomieu C. Modulating uranium binding affinity in engineered calmodulin EF-hand peptides: effect of phosphorylation. PLoS One 2012; 7:e41922. [PMID: 22870263 PMCID: PMC3411679 DOI: 10.1371/journal.pone.0041922] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2012] [Accepted: 06/29/2012] [Indexed: 12/21/2022] Open
Abstract
To improve our understanding of uranium toxicity, the determinants of uranyl affinity in proteins must be better characterized. In this work, we analyzed the contribution of a phosphoryl group on uranium binding affinity in a protein binding site, using the site 1 EF-hand motif of calmodulin. The recombinant domain 1 of calmodulin from A. thaliana was engineered to impair metal binding at site 2 and was used as a structured template. Threonine at position 9 of the loop was phosphorylated in vitro, using the recombinant catalytic subunit of protein kinase CK2. Hence, the T9TKE12 sequence was substituted by the CK2 recognition sequence TAAE. A tyrosine was introduced at position 7, so that uranyl and calcium binding affinities could be determined by following tyrosine fluorescence. Phosphorylation was characterized by ESI-MS spectrometry, and the phosphorylated peptide was purified to homogeneity using ion-exchange chromatography. The binding constants for uranyl were determined by competition experiments with iminodiacetate. At pH 6, phosphorylation increased the affinity for uranyl by a factor of ∼5, from Kd = 25±6 nM to Kd = 5±1 nM. The phosphorylated peptide exhibited a much larger affinity at pH 7, with a dissociation constant in the subnanomolar range (Kd = 0.25±0.06 nM). FTIR analyses showed that the phosphothreonine side chain is partly protonated at pH 6, while it is fully deprotonated at pH 7. Moreover, formation of the uranyl-peptide complex at pH 7 resulted in significant frequency shifts of the νas(P-O) and νs(P-O) IR modes of phosphothreonine, supporting its direct interaction with uranyl. Accordingly, a bathochromic shift in νas(UO2)2+ vibration (from 923 cm−1 to 908 cm−1) was observed upon uranyl coordination to the phosphorylated peptide. Together, our data demonstrate that the phosphoryl group plays a determining role in uranyl binding affinity to proteins at physiological pH.
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Affiliation(s)
- Romain Pardoux
- CEA, DSV IBEB, Laboratoire des Interactions Protéine-Métal, Saint-Paul-lez-Durance, France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
| | - Sandrine Sauge-Merle
- CEA, DSV IBEB, Laboratoire des Interactions Protéine-Métal, Saint-Paul-lez-Durance, France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
| | - David Lemaire
- CEA, DSV IBEB, Laboratoire des Interactions Protéine-Métal, Saint-Paul-lez-Durance, France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
| | - Pascale Delangle
- CEA, INAC, Service de Chimie Inorganique et Biologique (UMR_E 3 CEA UJF), Grenoble, France
| | - Luc Guilloreau
- CEA, DSV IBEB, Laboratoire des Interactions Protéine-Métal, Saint-Paul-lez-Durance, France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
| | - Jean-Marc Adriano
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
- CEA, DSV IBEB, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, Saint Paul-lez-Durance, France
| | - Catherine Berthomieu
- CEA, DSV IBEB, Laboratoire des Interactions Protéine-Métal, Saint-Paul-lez-Durance, France
- CNRS, UMR Biologie Végétale et Microbiologie Environnementale, Saint-Paul-lez-Durance, France
- Université d’Aix-Marseille, Saint-Paul-lez-Durance, France
- * E-mail:
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