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Schalk I, Michaud-Soret I. In Memoriam Pierre Cornelis 1949-2023. Biometals 2024; 37:1-2. [PMID: 38231418 DOI: 10.1007/s10534-023-00575-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Affiliation(s)
- Isabelle Schalk
- University of Strasbourg, CNRS, UMR7242, ESBS, Bld Sébastien Brant, F-67412, Illkirch, France
| | - Isabelle Michaud-Soret
- University Grenoble-Alpes, Laboratory of Chemistry and Biology of metals, UMR5249 CNRS CEA UGA, Interdisciplinary Research Institute of Grenoble, F-38054, Grenoble, France.
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2
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Laisney J, Chevallet M, Fauquant C, Sageot C, Moreau Y, Predoi D, Herlin-Boime N, Lebrun C, Michaud-Soret I. Ligand-Promoted Surface Solubilization of TiO 2 Nanoparticles by the Enterobactin Siderophore in Biological Medium. Biomolecules 2022; 12:1516. [PMID: 36291725 PMCID: PMC9599204 DOI: 10.3390/biom12101516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/03/2022] [Accepted: 10/10/2022] [Indexed: 03/08/2024] Open
Abstract
Titanium dioxide nanoparticles (TiO2-NPs) are increasingly used in consumer products for their particular properties. Even though TiO2 is considered chemically stable and insoluble, studying their behavior in biological environments is of great importance to figure their potential dissolution and transformation. The interaction between TiO2-NPs with different sizes and crystallographic forms (anatase and rutile) and the strong chelating enterobactin (ent) siderophore was investigated to look at a possible dissolution. For the first time, direct evidence of anatase TiO2-NP surface dissolution or solubilization (i.e., the removal of Ti atoms located at the surface) in a biological medium by this siderophore was shown and the progressive formation of a hexacoordinated titanium-enterobactin (Ti-ent) complex observed. This complex was characterized by UV-visible and Fourier transform infrared (FTIR) spectroscopy (both supported by Density Functional Theory calculations) as well as electrospray ionization mass spectrometry (ESI-MS) and X-ray photoelectron spectroscopy (XPS). A maximum of ca. 6.3% of Ti surface atoms were found to be solubilized after 24 h of incubation, releasing Ti-ent complexes in the micromolar range that could then be taken up by bacteria in an iron-depleted medium. From a health and environmental point of view, the effects associated to the solubilization of the E171 TiO2 food additive in the presence of enterobactin and the entrance of the Ti-enterobactin complex in bacteria were questioned.
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Affiliation(s)
- Jérôme Laisney
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | | | - Caroline Fauquant
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | - Camille Sageot
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | - Yohann Moreau
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | - Daniela Predoi
- National Institute of Materials Physics, Atomistilor 105 bis, 077125 Magurele, Romania
| | | | - Colette Lebrun
- Université Grenoble Alpes, IRIG-SyMMES, CEA, CNRS, CEA-Grenoble, 38000 Grenoble, France
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3
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Sarasa-Buisan C, Emonot E, Martínez-Júlvez M, Sevilla E, Velázquez-Campoy A, Crouzy S, Bes MT, Michaud-Soret I, Fillat MF. Metal binding and oligomerization properties of FurC (PerR) from Anabaena sp. PCC7120: an additional layer of regulation? Metallomics 2022; 14:6750011. [PMID: 36201459 DOI: 10.1093/mtomcs/mfac077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 10/03/2022] [Indexed: 11/12/2022]
Abstract
Metal and redox homeostasis in cyanobacteria is tightly controlled to preserve the photosynthetic machinery from mismetallation and minimize cell damage. This control is mainly taken by FUR (ferric uptake regulation) proteins. FurC works as the PerR (peroxide response) paralog in Anabaena sp. PCC7120. Despite its importance, this regulator remained poorly characterized. Although FurC lacks the typical CXXC motifs present in FUR proteins, it contains a tightly bound zinc per subunit. FurC:Zn stoichiometrically binds zinc and manganese in a second site, being manganese more efficient in the binding of FurC:Zn to its DNA target PprxA. Oligomerization analyses of FurC:Zn evidence the occurrence of different aggregates ranging from dimers to octamers. Notably, intermolecular disulfide bonds are not involved in FurC:Zn dimerization, being the dimer the most reduced form of the protein. Oligomerization of dimers occurs upon oxidation of thiols by H2O2 or diamide and can be reversed by DTT. Irreversible inactivation of the regulator occurs by metal catalyzed oxidation promoted by ferrous iron. However, inactivation upon oxidation with H2O2 in the absence of iron was reverted by addition of DTT. Comparison of models for FurC:Zn dimers and tetramers obtained using AlphaFold Colab and SWISS-MODEL allowed to infer the residues forming both metal-binding sites and to propose the involvement of Cys86 in reversible tetramer formation. Our results decipher the existence of two levels of inactivation of FurC:Zn of Anabaena sp. PCC7120, a reversible one through disulfide-formed FurC:Zn tetramers and the irreversible metal catalyzed oxidation. This additional reversible regulation may be specific of cyanobacteria.
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Affiliation(s)
- Cristina Sarasa-Buisan
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
| | - Etienne Emonot
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | - Marta Martínez-Júlvez
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
| | - Emma Sevilla
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
| | - Adrián Velázquez-Campoy
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
| | - Serge Crouzy
- Université Grenoble Alpes, CNRS CEA, IRIG-LCBM, 38000 Grenoble, France
| | - M Teresa Bes
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
| | | | - María F Fillat
- Departamento de Bioquímica y Biología Molecular y Celular e Instituto de Biocomputación y Física de Sistemas Complejos (Bifi), Universidad de Zaragoza, 50009-Zaragoza, Spain
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Kouadri A, Cormenier J, Gemy K, Macari L, Charbonnier P, Richaud P, Michaud-Soret I, Alfaidy N, Benharouga M. Copper-Associated Oxidative Stress Contributes to Cellular Inflammatory Responses in Cystic Fibrosis. Biomedicines 2021; 9:biomedicines9040329. [PMID: 33805052 PMCID: PMC8064106 DOI: 10.3390/biomedicines9040329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/17/2021] [Accepted: 03/19/2021] [Indexed: 12/17/2022] Open
Abstract
Cystic fibrosis (CF) is caused by mutations in the gene encoding the CF Transmembrane Conductance Regulator (CFTR), an apical chloride channel. An early inflammation (EI) in the lung of CF patients occurring in the absence of any bacterial infection has been reported. This EI has been proposed to be associated with oxidative stress (OX-S), generated by deregulations of the oxidant/antioxidant status. Recently, we demonstrated that copper (Cu), an essential trace element, mediates OX-S in bronchial cells. However, the role of this element in the development of CF-EI, in association with OX-S, has never been investigated. Using healthy (16HBE14o-; HBE), CF (CFBE14o-; CFBE), and corrected-wild type CFTR CF (CFBE-wt) bronchial cells, we characterized the inflammation and OX-S profiles in relation to the copper status and CFTR expression and function. We demonstrated that CFBE cells exhibited a CFTR-independent intrinsic inflammation. These cells also exhibited an alteration in mitochondria, UPR (Unfolded Protein Response), catalase, Cu/Zn- and Mn-SOD activities, and an increase in the intracellular content of iron, zinc, and Cu. The increase in Cu concentration was associated with OX-S and inflammatory responses. These data identify cellular Cu as a key factor in the generation of CF-associated OX-S and opens new areas of investigation to better understand CF-associated EI.
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Affiliation(s)
- Amal Kouadri
- Institut National de la Santé et de la Recherche Médicale U1292, Biologie et Biotechnologie Pour la Santé, 38000 Grenoble, France; (A.K.); (J.C.); (K.G.)
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
| | - Johanna Cormenier
- Institut National de la Santé et de la Recherche Médicale U1292, Biologie et Biotechnologie Pour la Santé, 38000 Grenoble, France; (A.K.); (J.C.); (K.G.)
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
| | - Kevin Gemy
- Institut National de la Santé et de la Recherche Médicale U1292, Biologie et Biotechnologie Pour la Santé, 38000 Grenoble, France; (A.K.); (J.C.); (K.G.)
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
| | - Laurence Macari
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
- Centre National de la Recherche Scientifique (CNRS), LCBM-UMR 5249, 38000 Grenoble, France
| | - Peggy Charbonnier
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
- Centre National de la Recherche Scientifique (CNRS), LCBM-UMR 5249, 38000 Grenoble, France
| | - Pierre Richaud
- CEA, CNRS, Institut de Biosciences et Biotechnologies d’Aix-Marseille (BIAM), Université Aix-Marseille, UMR 7265, CEA Cadarache, 13108 Saint-Paul-lez Durance, France;
| | - Isabelle Michaud-Soret
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
- Centre National de la Recherche Scientifique (CNRS), LCBM-UMR 5249, 38000 Grenoble, France
| | - Nadia Alfaidy
- Institut National de la Santé et de la Recherche Médicale U1292, Biologie et Biotechnologie Pour la Santé, 38000 Grenoble, France; (A.K.); (J.C.); (K.G.)
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
- Correspondance: (N.A.); (M.B.); Tel.: +4-3878-010117 (M.B.); Fax: +4-3878-5058 (M.B.)
| | - Mohamed Benharouga
- Institut National de la Santé et de la Recherche Médicale U1292, Biologie et Biotechnologie Pour la Santé, 38000 Grenoble, France; (A.K.); (J.C.); (K.G.)
- Commissariat à l’Energie Atomique et Aux Energies Alternatives (CEA), 38000 Grenoble, France; (L.M.); (P.C.); (I.M.-S.)
- Université Grenoble Alpes (UGA), 38043 Grenoble, France
- Correspondance: (N.A.); (M.B.); Tel.: +4-3878-010117 (M.B.); Fax: +4-3878-5058 (M.B.)
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Cunrath O, Graulier G, Carballido-Lopez A, Pérard J, Forster A, Geoffroy VA, Saint Auguste P, Bumann D, Mislin GLA, Michaud-Soret I, Schalk IJ, Fechter P. The pathogen Pseudomonas aeruginosa optimizes the production of the siderophore pyochelin upon environmental challenges. Metallomics 2020; 12:2108-2120. [PMID: 33355556 DOI: 10.1039/d0mt00029a] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Siderophores are iron chelators produced by bacteria to access iron, an essential nutrient. The pathogen Pseudomonas aeruginosa produces two siderophores, pyoverdine and pyochelin, the former with a high affinity for iron and the latter with a lower affinity. Furthermore, the production of both siderophores involves a positive auto-regulatory loop: the presence of the ferri-siderophore complex is essential for their large production. Since pyochelin has a lower affinity for iron it was hard to consider the role of pyochelin in drastic competitive environments where the host or the environmental microbiota produce strong iron chelators and may inhibit iron chelation by pyochelin. We showed here that the pyochelin pathway overcomes this difficulty through a more complex regulating mechanism for pyochelin production than previously described. Indeed, in the absence of pyoverdine, and thus higher difficulty to access iron, the bacteria are able to produce pyochelin independently of the presence of ferri-pyochelin. The regulation of the pyochelin pathway appeared to be more complex than expected with a more intricate tuning between repression and activation. Consequently, when the bacteria cannot produce pyoverdine they are able to produce pyochelin even in the presence of strong iron chelators. Such results support a more complex and varied role for this siderophore than previously described, and complexify the battle for iron during P. aeruginosa infection.
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Affiliation(s)
- Olivier Cunrath
- Université de Strasbourg, UMR7242, ESBS, Bld Sébastien Brant, F-67413 Illkirch, Strasbourg, France.
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Thomas SA, Catty P, Hazemann JL, Michaud-Soret I, Gaillard JF. The role of cysteine and sulfide in the interplay between microbial Hg(ii) uptake and sulfur metabolism. Metallomics 2020; 11:1219-1229. [PMID: 31143907 DOI: 10.1039/c9mt00077a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Biogenic thiols, such as cysteine, have been used to control the speciation of Hg(ii) in bacterial exposure experiments. However, the extracellular biodegradation of excess cysteine leads to the formation of Hg(ii)-sulfide species, convoluting the interpretation of Hg(ii) uptake results. Herein, we test the hypothesis that Hg(ii)-sulfide species formation is a critical step during bacterial Hg(ii) uptake in the presence of excess cysteine. An Escherichia coli (E. coli) wild-type and mutant strain lacking the decR gene that regulates cysteine degradation to sulfide were exposed to 50 and 500 nM Hg with 0 to 2 mM cysteine. The decR mutant released ∼4 times less sulfide from cysteine degradation compared to the wild-type for all tested cysteine concentrations during a 3 hour exposure period. We show with thermodynamic calculations that the predicted concentration of Hg(ii)-cysteine species remaining in the exposure medium (as opposed to forming HgS(s)) is a good proxy for the measured concentration of dissolved Hg(ii) (i.e., not cell-bound). Likewise, the measured cell-bound Hg(ii) correlates with thermodynamic calculations for HgS(s) formation in the presence of cysteine. High resolution X-ray absorption near edge structure (HR-XANES) spectra confirm the existence of cell-associated HgS(s) at 500 nM total Hg and suggest the formation of Hg-S clusters at 50 nM total Hg. Our results indicate that a speciation change to Hg(ii)-sulfide controls Hg(ii) cell-association in the presence of excess cysteine.
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Affiliation(s)
- Sara A Thomas
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA. and Université Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000 Grenoble, France.
| | - Patrice Catty
- Université Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000 Grenoble, France.
| | - Jean-Louis Hazemann
- Institut Néel, UPR 2940 CNRS-Université Grenoble Alpes, F-38000 Grenoble, France
| | | | - Jean-François Gaillard
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
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Marchioni M, Veronesi G, Worms I, Ling WL, Gallon T, Leonard D, Gateau C, Chevallet M, Jouneau PH, Carlini L, Battocchio C, Delangle P, Michaud-Soret I, Deniaud A. Safer-by-design biocides made of tri-thiol bridged silver nanoparticle assemblies. Nanoscale Horiz 2020; 5:507-513. [PMID: 32118225 DOI: 10.1039/c9nh00286c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Silver nanoparticles (AgNPs) are efficient biocides increasingly used in consumer products and medical devices. Their activity is due to their capacity to release bioavailable Ag(i) ions making them long-lasting biocides but AgNPs themselves are usually easily released from the product. Besides, AgNPs are highly sensitive to various chemical environments that triggers their transformation, decreasing their activity. Altogether, widespread use of AgNPs leads to bacterial resistance and safety concerns for humans and the environment. There is thus a crucial need for improvement. Herein, a proof of concept for a novel biocide based on AgNP assemblies bridged together by a tri-thiol bioinspired ligand is presented. The final nanomaterial is stable and less sensitive to chemical environments with AgNPs completely covered by organic molecules tightly bound via their thiol functions. Therefore, these AgNP assemblies can be considered as safer-by-design and innovative biocides, since they deliver a sufficient amount of Ag(i) for biocidal activity with no release of AgNPs, which are insensitive to transformations in the nanomaterial.
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Affiliation(s)
- Marianne Marchioni
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000 Grenoble, France.
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Kouadri A, El Khatib M, Cormenier J, Chauvet S, Zeinyeh W, El Khoury M, Macari L, Richaud P, Coraux C, Michaud-Soret I, Alfaidy N, Benharouga M. Involvement of the Prion Protein in the Protection of the Human Bronchial Epithelial Barrier Against Oxidative Stress. Antioxid Redox Signal 2019; 31:59-74. [PMID: 30569742 DOI: 10.1089/ars.2018.7500] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Aim: Bronchial epithelium acts as a defensive barrier against inhaled pollutants and microorganisms. This barrier is often compromised in inflammatory airway diseases that are characterized by excessive oxidative stress responses, leading to bronchial epithelial shedding, barrier failure, and increased bronchial epithelium permeability. Among proteins expressed in the junctional barrier and participating to the regulation of the response to oxidative and to environmental stresses is the cellular prion protein (PrPC). However, the role of PrPC is still unknown in the bronchial epithelium. Herein, we investigated the cellular mechanisms by which PrPC protein participates into the junctional complexes formation, regulation, and oxidative protection in human bronchial epithelium. Results: Both PrPC messenger RNA and mature protein were expressed in human epithelial bronchial cells. PrPC was localized in the apical domain and became lateral, at high degree of cell polarization, where it colocalized and interacted with adherens (E-cadherin/γ-catenin) and desmosomal (desmoglein/desmoplakin) junctional proteins. No interaction was detected with tight junction proteins. Disruption of such interactions induced the loss of the epithelial barrier. Moreover, we demonstrated that PrPC protection against copper-associated oxidative stress was involved in multiple processes, including the stability of adherens and desmosomal junctional proteins. Innovation: PrPC is a pivotal protein in the protection against oxidative stress that is associated with the degradation of adherens and desmosomal junctional proteins. Conclusion: Altogether, these results demonstrate that the loss of the integrity of the epithelial barrier by oxidative stress is attenuated by the activation of PrPC expression, where deregulation might be associated with respiratory diseases.
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Affiliation(s)
- Amal Kouadri
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Mariam El Khatib
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Johanna Cormenier
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Sylvain Chauvet
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Wael Zeinyeh
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Micheline El Khoury
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Laurence Macari
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
| | - Pierre Richaud
- 2 University of Aix-Marseille, CNRS, CEA, Institute of Bisosciences and Biotechnologies of Aix Marseille (BIAM), UMR 7265, CEA Cadarache, Saint-Paul-lez Durance, France
| | - Christelle Coraux
- 3 National Institute of Health and Medical Research (INSERM), UMR-S 903, Reims, France
| | | | - Nadia Alfaidy
- 4 University of Grenoble Alpes, INSERM U1036, CEA, BIG, BCI, Grenoble, France
| | - Mohamed Benharouga
- 1 University of Grenoble Alpes, CNRS, UMR 5249, CEA, BIG, CBM, Grenoble, France
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9
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Carballido Lopez A, Cunrath O, Forster A, Pérard J, Graulier G, Legendre R, Varet H, Sismeiro O, Perraud Q, Pesset B, Saint Auguste P, Bumann D, Mislin GLA, Coppee JY, Michaud-Soret I, Fechter P, Schalk IJ. Non-specific interference of cobalt with siderophore-dependent iron uptake pathways. Metallomics 2019; 11:1937-1951. [DOI: 10.1039/c9mt00195f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Presence of Co2+affects the production of the siderophore Pyochelin inPseudomonas aeruginosa. This repression is not Fur-dependent but due to competition of Pyochelin–Co2+with Pyochein–Fe3+for PchR (transcriptional activator).
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10
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Pérard J, Nader S, Levert M, Arnaud L, Carpentier P, Siebert C, Blanquet F, Cavazza C, Renesto P, Schneider D, Maurin M, Coves J, Crouzy S, Michaud-Soret I. Structural and functional studies of the metalloregulator Fur identify a promoter-binding mechanism and its role in Francisella tularensis virulence. Commun Biol 2018; 1:93. [PMID: 30271974 PMCID: PMC6123631 DOI: 10.1038/s42003-018-0095-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 06/14/2018] [Indexed: 11/18/2022] Open
Abstract
Francisella tularensis is a Gram-negative bacterium causing tularaemia. Classified as possible bioterrorism agent, it may be transmitted to humans via animal infection or inhalation leading to severe pneumonia. Its virulence is related to iron homeostasis involving siderophore biosynthesis directly controlled at the transcription level by the ferric uptake regulator Fur, as presented here together with the first crystal structure of the tetrameric F. tularensis Fur in the presence of its physiological cofactor, Fe2+. Through structural, biophysical, biochemical and modelling studies, we show that promoter sequences of F. tularensis containing Fur boxes enable this tetrameric protein to bind them by splitting it into two dimers. Furthermore, the critical role of F. tularensis Fur in virulence and pathogenesis is demonstrated with a fur-deleted mutant showing an attenuated virulence in macrophage-like cells and mice. Together, our study suggests that Fur is an attractive target of new antibiotics that attenuate the virulence of F. tularensis. Pérard et al. report the structure of Francisella tularensis Fur (FtFur) with its physiological cofactor Fe2+, and show that FtFur is important for virulence. This study identifies a promoter-driven tetramer splitting mechanism that may provide insight into future antibiotics development.
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Affiliation(s)
- J Pérard
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France.
| | - S Nader
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France
| | - M Levert
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - L Arnaud
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France
| | - P Carpentier
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France
| | - C Siebert
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - F Blanquet
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - C Cavazza
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France
| | - P Renesto
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - D Schneider
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - M Maurin
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC-IMAG, 38000, Grenoble, France
| | - J Coves
- Univ. Grenoble Alpes, CNRS, CEA, IBS, 38000, Grenoble, France
| | - S Crouzy
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France.
| | - I Michaud-Soret
- Univ. Grenoble Alpes, CNRS, CEA, BIG-LCBM, 38000, Grenoble, France.
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11
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Marchioni M, Jouneau PH, Chevallet M, Michaud-Soret I, Deniaud A. Silver nanoparticle fate in mammals: Bridging in vitro and in vivo studies. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.03.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Chevallet M, Veronesi G, Fuchs A, Mintz E, Michaud-Soret I, Deniaud A. Impact of labile metal nanoparticles on cellular homeostasis. Current developments in imaging, synthesis and applications. Biochim Biophys Acta Gen Subj 2017; 1861:1566-1577. [DOI: 10.1016/j.bbagen.2016.12.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Revised: 12/11/2016] [Accepted: 12/15/2016] [Indexed: 12/26/2022]
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13
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Liu W, Worms IAM, Herlin-Boime N, Truffier-Boutry D, Michaud-Soret I, Mintz E, Vidaud C, Rollin-Genetet F. Interaction of silver nanoparticles with metallothionein and ceruloplasmin: impact on metal substitution by Ag(i), corona formation and enzymatic activity. Nanoscale 2017; 9:6581-6594. [PMID: 28474724 DOI: 10.1039/c7nr01075c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The release of Ag(i) from silver nanoparticles (AgNPs) unintentionally spread in the environment is suspected to impair some key biological functions. In comparison with AgNO3, in-depth investigations were carried out into the interactions between citrate-coated AgNPs (20 nm) and two metalloproteins, intracellular metallothionein 1 (MT1) and plasmatic ceruloplasmin (Cp), both involved in metal homeostasis. These were chosen for their physiological relevance and the diversity of their various native metals bound because of thiol groups and/or their structural differences. Transmission electron microscopy (TEM), and dynamic light scattering (DLS), UV-vis and circular dichroism (CD) spectroscopies were used to study the effects of such intricate interactions on AgNP dissolution and proteins in terms of metal exchanges and structural modifications. The isolation of the different populations formed together with on-line quantifications of their metal content were performed by asymmetrical flow field-flow fractionation (AF4) linked to inductively coupled plasma mass spectrometry (ICP-MS). For the 2 proteins, Ag(i) dissolved from the AgNPs, substituted for the native metal, to different extents and with different types of dynamics for the corona formed: the MT1 rapidly surrounded the AgNPs with the transient reticulate corona thus promoting their dissolution associated with the metal substitution, whereas the Cp established a more stable layer around the AgNPs, with a limited substitution of Cu and a decrease in its ferroxidase activity. The accessibility and lability of the metal binding sites inside these proteins and their relative affinities for Ag(i) are discussed, taking into account the structural characteristics of the proteins.
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Affiliation(s)
- Wei Liu
- CEA, DRF-BIAM, Site de Marcoule, F-30207 Bagnols-sur-Cèze, France.
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14
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Chevallet M, Gallet B, Fuchs A, Jouneau PH, Um K, Mintz E, Michaud-Soret I. Metal homeostasis disruption and mitochondrial dysfunction in hepatocytes exposed to sub-toxic doses of zinc oxide nanoparticles. Nanoscale 2016; 8:18495-18506. [PMID: 27782264 DOI: 10.1039/c6nr05306h] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Increased production and use of zinc oxide nanoparticles (ZnO-NPs) in consumer products has prompted the scientific community to investigate their potential toxicity, and understand their impact on the environment and organisms. Molecular mechanisms involved in ZnO-NP toxicity are still under debate and focus essentially on high dose expositions. In our study, we chose to evaluate the effect of sub-toxic doses of ZnO-NPs on human hepatocytes (HepG2) with a focus on metal homeostasis and redox balance disruptions. We showed massive dissolution of ZnO-NPs outside the cell, transport and accumulation of zinc ions inside the cell but no evidence of nanoparticle entry, even when analysed by high resolution TEM microscopy coupled with EDX. Gene expression analysis highlighted zinc homeostasis disruptions as shown by metallothionein 1X and zinc transporter 1 and 2 (ZnT1, ZnT2) over-expression. Major oxidative stress response genes, such as superoxide dismutase 1, 2 and catalase were not induced. Phase 2 enzymes in term of antioxidant response, such as heme oxygenase 1 (HMOX1) and the regulating subunit of the glutamate-cysteine ligase (GCLM) were slightly upregulated, but these observations may be linked solely to metal homeostasis disruptions, as these actors are involved in both metal and ROS responses. Finally, we observed abnormal mitochondria morphologies and autophagy vesicles in response to ZnO-NPs, indicating a potential role of mitochondria in storing and protecting cells from zinc excess but ultimately causing cell death at higher doses.
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Affiliation(s)
- M Chevallet
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM), UMR 5249, Grenoble, France. and CEA, BIG, LCBM, Grenoble, France. and Université Grenoble Alpes, LCBM, Grenoble, France
| | - B Gallet
- Université Grenoble Alpes, IBS, Grenoble, France and CNRS, IBS, Grenoble, France and CEA, IBS, Grenoble, France
| | - A Fuchs
- CEA, BIG, DIR, Grenoble, France
| | - P H Jouneau
- CEA, INAC, Minatec campus, Grenoble, France and Université Grenoble Alpes, INAC-MEM-LEMMA, Grenoble, France
| | - K Um
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM), UMR 5249, Grenoble, France. and CEA, BIG, LCBM, Grenoble, France. and Université Grenoble Alpes, LCBM, Grenoble, France
| | - E Mintz
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM), UMR 5249, Grenoble, France. and CEA, BIG, LCBM, Grenoble, France. and Université Grenoble Alpes, LCBM, Grenoble, France
| | - I Michaud-Soret
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM), UMR 5249, Grenoble, France. and CEA, BIG, LCBM, Grenoble, France. and Université Grenoble Alpes, LCBM, Grenoble, France
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15
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Veronesi G, Deniaud A, Gallon T, Jouneau PH, Villanova J, Delangle P, Carrière M, Kieffer I, Charbonnier P, Mintz E, Michaud-Soret I. Visualization, quantification and coordination of Ag + ions released from silver nanoparticles in hepatocytes. Nanoscale 2016; 8:17012-17021. [PMID: 27722394 DOI: 10.1039/c6nr04381j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Silver nanoparticles (AgNPs) can enter eukaryotic cells and exert toxic effects, most probably as a consequence of the release of Ag+ ions. Due to the elusive nature of Ag+ ionic species, quantitative information concerning AgNP intracellular dissolution is missing. By using a synchrotron nanoprobe, silver is visualized and quantified in hepatocytes (HepG2) exposed to AgNPs; the synergistic use of electron microscopy allows for the discrimination between nanoparticular and ionic forms of silver within a single cell. AgNPs are located in endocytosis vesicles, while the visualized Ag+ ions diffuse in the cell. The averaged NP dissolution rates, measured by X-ray absorption spectroscopy, highlight the faster dissolution of citrate-coated AgNPs with respect to the less toxic PVP-coated AgNPs; these results are confirmed at the single-cell level. The released Ag+ ions recombine with thiol-bearing biomolecules: the Ag-S distances measured in cellulo, and the quantitative evaluation of gene expression, provide independent evidence of the involvement of glutathione and metallothioneins in Ag+ binding. The combined use of cutting-edge imaging techniques, atomic spectroscopy and molecular biology brings insight into the fate of AgNPs in hepatocytes, and more generally into the physicochemical transformations of metallic nanoparticles in biological environments and the resulting disruption of metal homeostasis.
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Affiliation(s)
- G Veronesi
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France. and ESRF, The European Synchrotron, 71, Avenue des Martyrs, 38043 Grenoble, France
| | - A Deniaud
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France.
| | - T Gallon
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France.
| | - P-H Jouneau
- INAC-MEM, Université Grenoble Alpes, Grenoble, France and CEA, INAC-MEM, Grenoble, France
| | - J Villanova
- ESRF, The European Synchrotron, 71, Avenue des Martyrs, 38043 Grenoble, France
| | - P Delangle
- Université Grenoble Alpes, INAC-SCIB, F-38054 Grenoble, France and CEA, INAC-SyMMES, F-38054 Grenoble, France
| | - M Carrière
- Université Grenoble Alpes, INAC-SCIB, F-38054 Grenoble, France and CEA, INAC-SyMMES, F-38054 Grenoble, France
| | - I Kieffer
- BM30B/FAME beamline, ESRF, F-38043 Grenoble cedex 9, France and Observatoire des Sciences de l'Univers de Grenoble, UMS 832 CNRS Université Joseph Fourier, F-38041 Grenoble, France
| | - P Charbonnier
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France.
| | - E Mintz
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France.
| | - I Michaud-Soret
- CNRS, Laboratoire de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UGA, F-38054 Grenoble, France and CEA, LCBM, F-38054 Grenoble, France and Université Grenoble Alpes, LCBM, F-38054 Grenoble, France.
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16
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Mathieu S, Cissé C, Vitale S, Ahmadova A, Degardin M, Pérard J, Colas P, Miras R, Boturyn D, Covès J, Crouzy S, Michaud-Soret I. From Peptide Aptamers to Inhibitors of FUR, Bacterial Transcriptional Regulator of Iron Homeostasis and Virulence. ACS Chem Biol 2016; 11:2519-28. [PMID: 27409249 DOI: 10.1021/acschembio.6b00360] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
FUR (Ferric Uptake Regulator) protein is a global transcriptional regulator that senses iron status and controls the expression of genes involved in iron homeostasis, virulence, and oxidative stress. Ubiquitous in Gram-negative bacteria and absent in eukaryotes, FUR is an attractive antivirulence target since the inactivation of the fur gene in various pathogens attenuates their virulence. The characterization of 13-aa-long anti-FUR linear peptides derived from the variable part of the anti-FUR peptide aptamers, that were previously shown to decrease pathogenic E. coli strain virulence in a fly infection model, is described herein. Modeling, docking, and experimental approaches in vitro (activity and interaction assays, mutations) and in cells (yeast two-hybrid assays) were combined to characterize the interactions of the peptides with FUR, and to understand their mechanism of inhibition. As a result, reliable structure models of two peptide-FUR complexes are given. Inhibition sites are mapped in the groove between the two FUR subunits where DNA should also bind. Another peptide behaves differently and interferes with the dimerization itself. These results define these novel small peptide inhibitors as lead compounds for inhibition of the FUR transcription factor.
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Affiliation(s)
- Sophie Mathieu
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Cheickna Cissé
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Sylvia Vitale
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Aynur Ahmadova
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Mélissa Degardin
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
- Univ. Grenoble
Alpes, DCM UMR 5250, F-38000 Grenoble, France
- CNRS, DCM UMR
5250, F-38000 Grenoble, France
| | - Julien Pérard
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Pierre Colas
- P2I2 Group, Protein Phosphorylation
and Human Disease Unit, CNRS Unité de Service et de Recherche
USR3151, Station Biologique de Roscoff, F-29680 Roscoff, France
| | - Roger Miras
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Didier Boturyn
- Univ. Grenoble
Alpes, DCM UMR 5250, F-38000 Grenoble, France
- CNRS, DCM UMR
5250, F-38000 Grenoble, France
| | - Jacques Covès
- Univ. Grenoble
Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Serge Crouzy
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
| | - Isabelle Michaud-Soret
- CNRS,
Laboratoire
de Chimie et Biologie des Métaux (LCBM) UMR 5249 CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes,
LCBM, F-38054 Grenoble, France
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17
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Pérard J, Covès J, Castellan M, Solard C, Savard M, Miras R, Galop S, Signor L, Crouzy S, Michaud-Soret I, de Rosny E. Quaternary Structure of Fur Proteins, a New Subfamily of Tetrameric Proteins. Biochemistry 2016; 55:1503-15. [DOI: 10.1021/acs.biochem.5b01061] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julien Pérard
- CNRS, Laboratoire de Chimie et Biologie
des Métaux
(LCBM), UMR 5249, CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38054 Grenoble, France
| | - Jacques Covès
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Mathieu Castellan
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Charles Solard
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Myriam Savard
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Roger Miras
- CNRS, Laboratoire de Chimie et Biologie
des Métaux
(LCBM), UMR 5249, CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38054 Grenoble, France
| | - Sandra Galop
- CNRS, Laboratoire de Chimie et Biologie
des Métaux
(LCBM), UMR 5249, CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38054 Grenoble, France
| | - Luca Signor
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
| | - Serge Crouzy
- CNRS, Laboratoire de Chimie et Biologie
des Métaux
(LCBM), UMR 5249, CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38054 Grenoble, France
| | - Isabelle Michaud-Soret
- CNRS, Laboratoire de Chimie et Biologie
des Métaux
(LCBM), UMR 5249, CNRS-CEA-UJF, F-38054 Grenoble, France
- CEA, LCBM, F-38054 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38054 Grenoble, France
| | - Eve de Rosny
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France
- CNRS, IBS, F-38044 Grenoble, France
- CEA, IBS, F-38044 Grenoble, France
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18
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Veronesi G, Gallon T, Deniaud A, Boff B, Gateau C, Lebrun C, Vidaud C, Rollin-Genetet F, Carrière M, Kieffer I, Mintz E, Delangle P, Michaud-Soret I. XAS Investigation of Silver(I) Coordination in Copper(I) Biological Binding Sites. Inorg Chem 2015; 54:11688-96. [DOI: 10.1021/acs.inorgchem.5b01658] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Giulia Veronesi
- CNRS,
UMR 5249, CNRS-CEA-UJF; CEA;
and University Grenoble Alpes, Laboratoire de Chimie et Biologie des Métaux (LCBM), F-38054 Grenoble, France
- ESRF, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043 Grenoble, France
| | - Thomas Gallon
- CNRS,
UMR 5249, CNRS-CEA-UJF; CEA;
and University Grenoble Alpes, Laboratoire de Chimie et Biologie des Métaux (LCBM), F-38054 Grenoble, France
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Aurélien Deniaud
- CNRS,
UMR 5249, CNRS-CEA-UJF; CEA;
and University Grenoble Alpes, Laboratoire de Chimie et Biologie des Métaux (LCBM), F-38054 Grenoble, France
| | - Bastien Boff
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Christelle Gateau
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Colette Lebrun
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Claude Vidaud
- CEA/DSV/iBEB/SBTN, BP 17171, 30207 Bagnols sur Cèze, France
| | | | - Marie Carrière
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Isabelle Kieffer
- BM30B/FAME
beamline, ESRF, F-38043 Grenoble cedex 9, France
- Observatoire
des Sciences de l’Univers de Grenoble, UMS 832 CNRS, Université Joseph Fourier, F-38041 Grenoble, France
| | - Elisabeth Mintz
- CNRS,
UMR 5249, CNRS-CEA-UJF; CEA;
and University Grenoble Alpes, Laboratoire de Chimie et Biologie des Métaux (LCBM), F-38054 Grenoble, France
| | - Pascale Delangle
- University
Grenoble Alpes and CEA, INAC-SCIB, F-38000 Grenoble, France
| | - Isabelle Michaud-Soret
- CNRS,
UMR 5249, CNRS-CEA-UJF; CEA;
and University Grenoble Alpes, Laboratoire de Chimie et Biologie des Métaux (LCBM), F-38054 Grenoble, France
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19
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Cissé C, Mathieu SV, Abeih MBO, Flanagan L, Vitale S, Catty P, Boturyn D, Michaud-Soret I, Crouzy S. Inhibition of the ferric uptake regulator by peptides derived from anti-FUR peptide aptamers: coupled theoretical and experimental approaches. ACS Chem Biol 2014; 9:2779-86. [PMID: 25238402 DOI: 10.1021/cb5005977] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The FUR protein (ferric uptake regulator) is an iron-dependent global transcriptional regulator. Specific to bacteria, FUR is an attractive antibacterial target since virulence is correlated to iron bioavailability. Recently, four anti-FUR peptide aptamers, composed of 13 amino acid variable loops inserted into a thioredoxinA scaffold, were identified, which were able to interact with Escherichia coli FUR (EcFUR), inhibit its binding to DNA and to decrease the virulence of pathogenic E. coli in a fly infection model. The first characterization of anti-FUR linear peptides (pF1 6 to 13 amino acids) derived from the variable part of the F1 anti-FUR peptide aptamer is described herein. Theoretical and experimental approaches, in original combination, were used to study interactions of these peptides with FUR in order to understand their mechanism of inhibition. After modeling EcFUR by homology, docking with Autodock was combined with molecular dynamics simulations in implicit solvent to take into account the flexibility of the partners. All calculations were cross-checked either with other programs or with experimental data. As a result, reliable structures of EcFUR and its complex with pF1 are given and an inhibition pocket formed by the groove between the two FUR subunits is proposed. The location of the pocket was validated through experimental mutation of key EcFUR residues at the site of proposed peptide interaction. Cyclisation of pF1, mimicking the peptide constraint in F1, improved inhibition. The details of the interactions between peptide and protein were analyzed and a mechanism of inhibition of these anti-FUR molecules is proposed.
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Affiliation(s)
- Cheickna Cissé
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Sophie V. Mathieu
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Mohamed B. Ould Abeih
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Lindsey Flanagan
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Sylvia Vitale
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Patrice Catty
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Didier Boturyn
- Univ. Grenoble Alpes, DCM, CRNS, UMR 5250, F-38000 Grenoble, France
| | - Isabelle Michaud-Soret
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
| | - Serge Crouzy
- CEA, Laboratoire
de Chimie et Biologie des Métaux
(LCBM), F-38000 Grenoble, France
- CNRS, LCBM, F-38000 Grenoble, France
- Univ. Grenoble Alpes, LCBM, F-38000 Grenoble, France
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Cuillel M, Chevallet M, Charbonnier P, Fauquant C, Pignot-Paintrand I, Arnaud J, Cassio D, Michaud-Soret I, Mintz E. Interference of CuO nanoparticles with metal homeostasis in hepatocytes under sub-toxic conditions. Nanoscale 2014; 6:1707-1715. [PMID: 24343273 DOI: 10.1039/c3nr05041f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Copper oxide nanoparticles (CuO-NP) were studied for their toxicity and mechanism of action on hepatocytes (HepG2), in relation to Cu homeostasis disruption. Indeed, hepatocytes, in the liver, are responsible for the whole body Cu balance and should be a major line of defence in the case of exposure to CuO-NP. We investigated the early responses to sub-toxic doses of CuO-NP and compared them to equivalent doses of Cu added as salt to see if there is a specific nano-effect related to Cu homeostasis in hepatocytes. The expression of the genes encoding the Cu-ATPase ATP7B, metallothionein 1X, heme oxygenase 1, heat shock protein 70, superoxide dismutase 1, glutamate cysteine ligase modifier subunit, metal responsive element-binding transcription factor 1 and zinc transporter 1 was analyzed by qRT-PCR. These genes are known to be involved in response to Cu, Zn and/or oxidative stresses. Except for MTF1, ATP7B and SOD1, we clearly observed an up regulation of these genes expression in CuO-NP treated cells, as compared to CuCl2. In addition, ATP7B trafficking from the Golgi network to the bile canaliculus membrane was observed in WIF-B9 cells, showing a need for Cu detoxification. This shows an increase in the intracellular Cu concentration, probably due to Cu release from endosomal CuO-NP solubilisation. Our data show that CuO-NP enter hepatic cells, most probably by endocytosis, bypassing the cellular defence mechanism against Cu, thus acting as a Trojan horse. Altogether, this study suggests that sub-toxic CuO-NP treatments induce successively a Cu overload, a Cu-Zn exchange on metallothioneins and MTF1 regulation on both Cu and Zn homeostasis.
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Muller C, Bahlawane C, Aubert S, Delay CM, Schauer K, Michaud-Soret I, De Reuse H. Hierarchical regulation of the NikR-mediated nickel response in Helicobacter pylori. Nucleic Acids Res 2011; 39:7564-75. [PMID: 21666253 PMCID: PMC3177205 DOI: 10.1093/nar/gkr460] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Nickel is an essential metal for Helicobacter pylori, as it is the co-factor of two enzymes crucial for colonization, urease and hydrogenase. Nickel is taken up by specific transporters and its intracellular homeostasis depends on nickel-binding proteins to avoid toxicity. Nickel trafficking is controlled by the Ni(II)-dependent transcriptional regulator NikR. In contrast to other NikR proteins, NikR from H. pylori is a pleiotropic regulator that depending on the target gene acts as an activator or a repressor. We systematically quantified the in vivo Ni2+-NikR response of 11 direct NikR targets that encode functions related to nickel metabolism, four activated and seven repressed genes. Among these, four targets were characterized for the first time (hpn, hpn-like, hydA and hspA) and NikR binding to their promoter regions was demonstrated by electrophoretic mobility shift assays. We found that NikR-dependent repression was generally set up at higher nickel concentrations than activation. Kinetics of the regulation revealed a gradual and temporal NikR-mediated response to nickel where activation of nickel-protection mechanisms takes place before repression of nickel uptake. Our in vivo study demonstrates, for the first time, a chronological hierarchy in the NikR-dependent transcriptional response to nickel that is coherent with the control of nickel homeostasis in H. pylori.
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Affiliation(s)
- Cécile Muller
- Département de Microbiologie, Institut Pasteur, Unité Pathogenèse de Helicobacter, Paris Cedex 15, France
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22
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Dian C, Vitale S, Leonard GA, Bahlawane C, Fauquant C, Leduc D, Muller C, de Reuse H, Michaud-Soret I, Terradot L. The structure of the Helicobacter pylori ferric uptake regulator Fur reveals three functional metal binding sites. Mol Microbiol 2011; 79:1260-75. [PMID: 21208302 DOI: 10.1111/j.1365-2958.2010.07517.x] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Fur, the ferric uptake regulator, is a transcription factor that controls iron metabolism in bacteria. Binding of ferrous iron to Fur triggers a conformational change that activates the protein for binding to specific DNA sequences named Fur boxes. In Helicobacter pylori, HpFur is involved in acid response and is important for gastric colonization in model animals. Here we present the crystal structure of a functionally active HpFur mutant (HpFur2M; C78S-C150S) bound to zinc. Although its fold is similar to that of other Fur and Fur-like proteins, the crystal structure of HpFur reveals a unique structured N-terminal extension and an unusual C-terminal helix. The structure also shows three metal binding sites: S1 the structural ZnS₄ site previously characterized biochemically in HpFur and the two zinc sites identified in other Fur proteins. Site-directed mutagenesis and spectroscopy analyses of purified wild-type HpFur and various mutants show that the two metal binding sites common to other Fur proteins can be also metallated by cobalt. DNA protection and circular dichroism experiments demonstrate that, while these two sites influence the affinity of HpFur for DNA, only one is absolutely required for DNA binding and could be responsible for the conformational changes of Fur upon metal binding while the other is a secondary site.
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Affiliation(s)
- Cyril Dian
- Structural Biology Group, European Synchrotron Radiation Facility, BP 220 F-38043 Grenoble cedex 9, France
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23
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Bahlawane C, Dian C, Muller C, Round A, Fauquant C, Schauer K, de Reuse H, Terradot L, Michaud-Soret I. Structural and mechanistic insights into Helicobacter pylori NikR activation. Nucleic Acids Res 2010; 38:3106-18. [PMID: 20089510 PMCID: PMC2875016 DOI: 10.1093/nar/gkp1216] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
NikR is a transcriptional metalloregulator central in the mandatory response to acidity of Helicobacter pylori that controls the expression of numerous genes by binding to specific promoter regions. NikR/DNA interactions were proposed to rely on protein activation by Ni(II) binding to high-affinity (HA) and possibly secondary external (X) sites. We describe a biochemical characterization of HpNikR mutants that shows that the HA sites are essential but not sufficient for DNA binding, while the secondary external (X) sites and residues from the HpNikR dimer–dimer interface are important for DNA binding. We show that a second metal is necessary for HpNikR/DNA binding, but only to some promoters. Small-angle X-ray scattering shows that HpNikR adopts a defined conformation in solution, resembling the cis-conformation and suggests that nickel does not trigger large conformational changes in HpNikR. The crystal structures of selected mutants identify the effects of each mutation on HpNikR structure. This study unravels key structural features from which we derive a model for HpNikR activation where: (i) HA sites and an hydrogen bond network are required for DNA binding and (ii) metallation of a unique secondary external site (X) modulates HpNikR DNA binding to low-affinity promoters by disruption of a salt bridge.
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Affiliation(s)
- C Bahlawane
- CNRS UMR 5249 Laboratoire de Chimie et Biologie des Métaux, France
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24
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Vitale S, Fauquant C, Lascoux D, Schauer K, Saint-Pierre C, Michaud-Soret I. A ZnS4 Structural Zinc Site in the Helicobacter pylori Ferric Uptake Regulator. Biochemistry 2009; 48:5582-91. [DOI: 10.1021/bi9004396] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Sylvia Vitale
- CNRS UMR 5249 Laboratoire de Chimie et Biologie des Métaux, Commissariat à l’Energie Atomique (CEA), Direction des Sciences du Vivant (DSV), l’Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), and Université Joseph Fourier, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
| | - Caroline Fauquant
- CNRS UMR 5249 Laboratoire de Chimie et Biologie des Métaux, Commissariat à l’Energie Atomique (CEA), Direction des Sciences du Vivant (DSV), l’Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), and Université Joseph Fourier, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
| | - David Lascoux
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale, Jean-Pierre Ebel (UMR 5075 CNRS/CEA/UJF), F-38027 Grenoble Cedex 1, France
| | - Kristine Schauer
- Unité Pathogenèse de Helicobacter, Institut Pasteur, 28 rue du Docteur Roux, 75724 Paris Cedex 15, France
| | - Christine Saint-Pierre
- Laboratoire des Lésions des Acides Nucléiques, DSM/INAC/Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF CNRS FRE 3200, 17 rue des Martyrs, Grenoble F-38054 Cedex 9, France
| | - Isabelle Michaud-Soret
- CNRS UMR 5249 Laboratoire de Chimie et Biologie des Métaux, Commissariat à l’Energie Atomique (CEA), Direction des Sciences du Vivant (DSV), l’Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), and Université Joseph Fourier, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
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25
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Ahmad R, Brandsdal BO, Michaud-Soret I, Willassen NP. Ferric uptake regulator protein: Binding free energy calculations and per-residue free energy decomposition. Proteins 2009; 75:373-86. [DOI: 10.1002/prot.22247] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Diederix REM, Fauquant C, Rodrigue A, Mandrand-Berthelot MA, Michaud-Soret I. Sub-micromolar affinity of Escherichia coli NikR for Ni(ii). Chem Commun (Camb) 2008:1813-5. [DOI: 10.1039/b719676h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abed N, Bickle M, Mari B, Schapira M, Sanjuan-España R, Robbe Sermesant K, Moncorgé O, Mouradian-Garcia S, Barbry P, Rudkin BB, Fauvarque MO, Michaud-Soret I, Colas P. A comparative analysis of perturbations caused by a gene knock-out, a dominant negative allele, and a set of peptide aptamers. Mol Cell Proteomics 2007; 6:2110-21. [PMID: 17785351 DOI: 10.1074/mcp.m700105-mcp200] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The study of protein function mostly relies on perturbing regulatory networks by acting upon protein expression levels or using transdominant negative agents. Here we used the Escherichia coli global transcription regulator Fur (ferric uptake regulator) as a case study to compare the perturbations exerted by a gene knock-out, the expression of a dominant negative allele of a gene, and the expression of peptide aptamers that bind a gene product. These three perturbations caused phenotypes that differed quantitatively and qualitatively from one another. The Fur peptide aptamers inhibited the activity of their target to various extents and reduced the virulence of a pathogenic E. coli strain in Drosophila. A genome-wide transcriptome analysis revealed that the "penetrance" of a peptide aptamer was comparable to that of a dominant negative allele but lower than the penetrance of the gene knock-out. Our work shows that comparative analysis of phenotypic and transcriptome responses to different types of perturbation can help decipher complex regulatory networks that control various biological processes.
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Affiliation(s)
- Nadia Abed
- Differentiation and Cell Cycle Group, Laboratoire de Biologie Moléculaire de la Cellule, UMR 5239 CNRS/ENS Lyon, Université Lyon 1, Ecole Normale Supérieure de Lyon, IFR 128 BioSciences Lyon-Gerland, 46 allée d'Italie, 69364 Lyon cedex 07, France
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28
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D'Autréaux B, Pecqueur L, Gonzalez de Peredo A, Diederix REM, Caux-Thang C, Tabet L, Bersch B, Forest E, Michaud-Soret I. Reversible Redox- and Zinc-Dependent Dimerization of theEscherichia coliFur Protein. Biochemistry 2007; 46:1329-42. [PMID: 17260962 DOI: 10.1021/bi061636r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fur is a bacterial regulator using iron as a cofactor to bind to specific DNA sequences. This protein exists in solution as several oligomeric states, of which the dimer is generally assumed to be the biologically relevant one. We describe the equilibria that exist between dimeric Escherichia coli Fur and higher oligomers. The dissociation constant for the dimer-tetramer equilibrium is estimated to be in the millimolar range. Oligomerization is enhanced at low ionic strength and pH. The as-isolated monomeric form of Fur is not in equilibrium with the dimer and contains two disulfide bridges (C92-C95 and C132-C137). Binding of the monomer to DNA is metal-dependent and sequence specific with an apparent affinity 5.5 times lower than that of the dimer. Size exclusion chromatography, EDC cross-linking, and CD spectroscopy show that reconstitution of the dimer from the monomer requires reduction of the disulfide bridges and coordination of Zn2+. Reduction of the disulfide bridges or Zn2+ alone does not promote dimerization. EDC and DMA cross-links reveal that the N-terminal NH2 group of one subunit is in an ionic interaction with acidic residues of the C-terminal tail and close to Lys76 and Lys97 of the other. Furthermore, the yields of cross-link drastically decrease upon binding of metal in the activation site, suggesting that the N-terminus is involved in the conformational change. Conversely, oxidizing reagents, H2O2 or diamide, disrupt the dimeric structure leading to monomer formation. These results establish that coordination of the zinc ion and the redox state of the cysteines are essential for holding E. coli Fur in a dimeric state.
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Affiliation(s)
- Benoît D'Autréaux
- Laboratoire de Physicochimie des Métaux en Biologie, UMR 5155 CNRS/CEA/UJF, Département Réponse et Dynamique Cellulaires, CEA-Grenoble, 17 avenue des Martyrs, 38054 Grenoble cedex 9, France
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29
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Fauquant C, Diederix REM, Rodrigue A, Dian C, Kapp U, Terradot L, Mandrand-Berthelot MA, Michaud-Soret I. pH dependent Ni(II) binding and aggregation of Escherichia coli and Helicobacter pylori NikR. Biochimie 2006; 88:1693-705. [PMID: 16930800 DOI: 10.1016/j.biochi.2006.07.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Accepted: 07/19/2006] [Indexed: 11/30/2022]
Abstract
NikR proteins are bacterial metallo-regulatory transcription factors that control the expression of the nickel uptake system and/or nickel containing enzymes such as urease, and are involved in the acid stress response. Here, a comparative study is reported on NikR from Helicobacter pylori (HpNikR) and Escherichia coli (EcNikR), as well as the Q2E mutant of EcNikR. Most attention was focused on the Ni(II) binding properties of these proteins, as a function of pH. The influence of the pH on the Ni(II) binding and aggregation properties was studied using gel filtration analysis and UV-visible absorption spectroscopy in the presence of an increasing concentration of nickel. Q2E and wt EcNikR are identical in Ni(II) binding but the Q2E mutant is impaired to some extent in DNA-binding. For EcNikR it is shown that between pH 6 and 8, addition of Ni(II) above 1 equiv. induces mass aggregation and precipitation, concomitant with binding of Ni(II) up to a maximum of 5-8 Ni(II) ions per monomer. The Ni(II) site with highest affinity is the well-described square planar site with three histidines and one cysteine ligands. Aggregation is complete in the presence of less than 1 extra equiv. of Ni(II) and aggregation is fully reversible and precipitates are rapidly solubilized by addition of EDTA. The sensitivity of EcNikR to aggregation decreases with decreasing pH, concurrent with histidines being the main ligands of the site responsible for aggregation. HpNikR does not display aggregation except at alkaline pH, where 3 Ni(II) equiv. are needed. The participation of a cluster consisting of surface-exposed histidines present in EcNikR but not in HpNikR, is proposed to be involved in aggregation. Our results on HpNikR are compatible with the crystallographic data and with the ability of this protein to bind more than one nickel.
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Affiliation(s)
- C Fauquant
- Laboratoire de Physicochimie Des Métaux en Biologie, Département Réponse et Dynamique et Cellulaires, CEA-Grenoble, 17, avenue des Martyrs, 38054 Grenoble cedex 9, France
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Pecqueur L, D'Autréaux B, Dupuy J, Nicolet Y, Jacquamet L, Brutscher B, Michaud-Soret I, Bersch B. Structural Changes of Escherichia coli Ferric Uptake Regulator during Metal-dependent Dimerization and Activation Explored by NMR and X-ray Crystallography. J Biol Chem 2006; 281:21286-21295. [PMID: 16690618 DOI: 10.1074/jbc.m601278200] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ferric uptake regulator (Fur) is a global bacterial regulator that uses iron as a cofactor to bind to specific DNA sequences. Escherichia coli Fur is usually isolated as a homodimer with two metal sites per subunit. Metal binding to the iron site induces protein activation; however the exact role of the structural zinc site is still unknown. Structural studies of three different forms of the Escherichia coli Fur protein (nonactivated dimer, monomer, and truncated Fur-(1-82)) were performed. Dimerization of the oxidized monomer was followed by NMR in the presence of a reductant (dithiothreitol) and Zn(II). Reduction of the disulfide bridges causes only local structure variations, whereas zinc addition to reduced Fur induces protein dimerization. This demonstrates for the first time the essential role of zinc in the stabilization of the quaternary structure. The secondary structures of the mono- and dimeric forms are almost conserved in the N-terminal DNA-binding domain, except for the first helix, which is not present in the nonactivated dimer. In contrast, the C-terminal dimerization domain is well structured in the dimer but appears flexible in the monomer. This is also confirmed by heteronuclear Overhauser effect data. The crystal structure at 1.8A resolution of a truncated protein (Fur-(1-82)) is described and found to be identical to the N-terminal domain in the monomeric and in the metal-activated state. Altogether, these data allow us to propose an activation mechanism for E. coli Fur involving the folding/unfolding of the N-terminal helix.
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Affiliation(s)
- Ludovic Pecqueur
- Laboratoire de Physicochimie des Métaux en Biologie (Unité Mixte de Recherche 5155 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), Département Réponse et Dynamique Cellulaires, Commissariat à l'Energie Atomique-Grenoble, 17 Avenue des Martyrs, F-38054 Grenoble Cedex 9, France; Laboratoire de Résonance Magnétique Nucléaire des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1
| | - Benoît D'Autréaux
- Laboratoire de Physicochimie des Métaux en Biologie (Unité Mixte de Recherche 5155 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), Département Réponse et Dynamique Cellulaires, Commissariat à l'Energie Atomique-Grenoble, 17 Avenue des Martyrs, F-38054 Grenoble Cedex 9, France
| | - Jérome Dupuy
- Laboratoire de Cristallographie et de Cristallogénèse des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1
| | - Yvain Nicolet
- Laboratoire de Cristallographie et de Cristallogénèse des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1
| | - Lilian Jacquamet
- Laboratoire de Cristallographie et de Cristallogénèse des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1
| | - Bernhard Brutscher
- Laboratoire de Résonance Magnétique Nucléaire des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1
| | - Isabelle Michaud-Soret
- Laboratoire de Physicochimie des Métaux en Biologie (Unité Mixte de Recherche 5155 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), Département Réponse et Dynamique Cellulaires, Commissariat à l'Energie Atomique-Grenoble, 17 Avenue des Martyrs, F-38054 Grenoble Cedex 9, France.
| | - Beate Bersch
- Laboratoire de Résonance Magnétique Nucléaire des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel (Unité Mixte de Recherche 5075 CNRS/Commissariat à l'Energie Atomique/Université Joseph Fourier), F-38027 Grenoble Cedex 1.
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Earhart CA, Vetting MW, Gosu R, Michaud-Soret I, Que L, Ohlendorf DH. Structure of catechol 1,2-dioxygenase from Pseudomonas arvilla. Biochem Biophys Res Commun 2005; 338:198-205. [PMID: 16171781 DOI: 10.1016/j.bbrc.2005.08.221] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2005] [Accepted: 08/30/2005] [Indexed: 11/24/2022]
Abstract
Catechol 1,2-dioxygenase was first studied by Hayaishi and colleagues in 1950. In 1967, catechol 1,2-dioxygenase from Pseudomonas arvilla C-1 (PaCTD) was chosen as a model system for the catecholic intradiol dioxygenases due to its activity, stability and expression level. Here we report the 2.65 A structure of the betabeta isozyme of PaCTD. The structure supports the hypothesis first made by Vetting and Ohlendorf [The 1.8A crystal structure of catechol 1,2-dioxygenase reveals a novel hydrophobic helical zipper as a subunit linker, Struct. Fold. Des. 8 (2000) 429-440.] that the catechol 1,2-dioxygenases are lipid binding proteins. The 5 amino-terminal helices involved in dimerization and forming the lipid binding site are shown to be plastic in their positions and orientations. The sequence differences between the alpha and beta polypeptides are located at the part of the monomers distant from dimerization surface and thus permit the formation of the 3 isozymes (alphaalpha, alphabeta, and betabeta) of PaCTD. The reported inactivation by sulfhydryl-modifying reagents is explained by the structure. The 10-residue Helix F (residues 203-212) is proposed to be central in communicating between the lipid binding site and the active site.
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Affiliation(s)
- Cathleen A Earhart
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA
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Tiss A, Barre O, Michaud-Soret I, Forest E. Characterization of the DNA-binding site in the ferric uptake regulator protein from Escherichia coli by UV crosslinking and mass spectrometry. FEBS Lett 2005; 579:5454-60. [PMID: 16212958 DOI: 10.1016/j.febslet.2005.08.067] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2005] [Revised: 06/27/2005] [Accepted: 08/02/2005] [Indexed: 10/25/2022]
Abstract
Ferric uptake regulator protein (Fur) is activated by its cofactor iron to a state that binds to a specific DNA sequence called 'Fur box'. Using mass spectrometry-based methods, we showed that Tyr 55 of Escherichia coli Fur, as well as the two thymines in positions 18 and 19 of the consensus Fur Box, are involved with binding. A conformational model of the Fur-DNA complex is proposed, in which DNA is in contact with each H4 [A52-A64] Fur helix. We propose that this interaction is a common feature for the Fur-like proteins, such as Zur and PerR, and their respective DNA boxes.
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Affiliation(s)
- Ali Tiss
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale (UMR 5075 CEA-CNRS-UJF), Grenoble, France
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D'Autréaux B, Horner O, Oddou JL, Jeandey C, Gambarelli S, Berthomieu C, Latour JM, Michaud-Soret I. Spectroscopic description of the two nitrosyl-iron complexes responsible for fur inhibition by nitric oxide. J Am Chem Soc 2004; 126:6005-16. [PMID: 15137765 DOI: 10.1021/ja031671a] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ferric uptake regulation protein (Fur) is a global regulator, ubiquitous in Gram negative bacteria, that acts as a transcriptional repressor when it binds ferrous ion. Fur is involved in responses to several types of stress related to iron metabolism, such as stress induced by nitric oxide (NO) generated by macrophages against bacterial invasion. NO was recently shown to react with Fe(2+) ions in FeFur (iron substituted Fur protein) leading to an Fur bound iron-nitrosyl complex, unable to bind DNA, and characterized by a g = 2.03 EPR signal, associated with an S = (1)/(2) ground state. This electronic configuration could arise from either a mononitrosyl-iron [Fe(NO)](7) or a dinitrosyl-iron [Fe(NO)(2)](9) complex. The use of several spectroscopic tools such as EPR, ENDOR, FTIR, Mössbauer, and UV-visible spectroscopies as well as mass spectrometry analysis was necessary to characterize the iron-nitrosyl species in Fur. Furthermore, changes of C132 and C137 into glycines by site directed mutagenesis reveal that neither of the two cysteines is required for the formation of the g = 2.03 signal. Altogether, we found that two species are responsible for Fur inhibition in NO stress conditions: the major species, S(1/2), is an [Fe(NO)(2)](9) (S = (1)/(2)) complex without bound thiolate and the minor species is probably a diamagnetic [Fe(NO)(2)](8) (S = 0) complex. This is the first characterization of these physiologically relevant species potentially linking iron metabolism and the response to NO toxicity in bacteria.
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Affiliation(s)
- Benoît D'Autréaux
- Laboratoire de Physicochimie des Métaux en Biologie, UMR CNRS-CEA-UJF 5155, CEA-Grenoble, 38054 Grenoble Cedex 9, France
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Champier L, Duarte V, Michaud-Soret I, Covès J. Characterization of the MerD protein from Ralstonia metallidurans CH34: a possible role in bacterial mercury resistance by switching off the induction of the mer operon. Mol Microbiol 2004; 52:1475-85. [PMID: 15165248 DOI: 10.1111/j.1365-2958.2004.04071.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
MerD and MerR from Tn4378 found in Ralstonia metallidurans CH34 were purified to homogeneity after overexpression in Escherichia coli. Using electrophoretic mobility shift assays and footprinting experiments, we found that MerD cannot bind to DNA. However, in vitro MerD can form a ternary complex in association with merOP and MerR. The presence of MerD in this complex was demonstrated by Western analysis with antibodies to MerD. To our knowledge, this is the first description of such a ternary complex between MerD-MerR and DNA. The formation and stability of this ternary complex are dependent on the relative concentration of the two proteins and modulated by the presence of mercury. We postulate that MerD could displace Hg-bound MerR from the mer operator to allow new synthesis of metal-free MerR able to switch off the induction of the mer genes when the external mercury is exhausted. This could fully explain how MerD can be a co-regulator repressing the induction of the mer operon.
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Affiliation(s)
- Ludovic Champier
- Laboratoire de Chimie et Biochimie des Centres Redox Biologiques, France
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D'Autreaux B, Touati D, Bersch B, Latour JM, Michaud-Soret I. Direct inhibition by nitric oxide of the transcriptional ferric uptake regulation protein via nitrosylation of the iron. Proc Natl Acad Sci U S A 2002; 99:16619-24. [PMID: 12475930 PMCID: PMC139193 DOI: 10.1073/pnas.252591299] [Citation(s) in RCA: 153] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ferric uptake regulation protein (Fur) is a bacterial global regulator that uses iron as a cofactor to bind to specific DNA sequences. The function of Fur is not limited to iron homeostasis. A wide variety of genes involved in various mechanisms such as oxidative and acid stresses are under Fur control. Flavohemoglobin (Hmp) is an NO-detoxifying enzyme induced by NO and nitrosothiol compounds. Fur recently was found to regulate hmp in Salmonella typhimurium, and in Escherichia coli, the iron-chelating agent 2,2'-dipyridyl induces hmp expression. We now establish direct inhibition of E. coli Fur activity by NO. By using chromosomal Fur-regulated lacZ reporter fusion in E. coli, Fur activity is switched off by NO at micromolar concentration. In vitro Fur DNA-binding activity, as measured by protection of restriction site in aerobactin promoter, is directly sensitive to NO. NO reacts with Fe(II) in purified FeFur protein to form a S = 12 low-spin FeFur-NO complex with a g = 2.03 EPR signal. Appearance of the same EPR signal in NO-treated cells links nitrosylation of the iron with Fur inhibition. The nitrosylated Fur protein is still a dimer and is stable in anaerobiosis but slowly decays in air. This inhibition probably arises from a conformational switch, leading to an inactive dimeric protein. These data establish a link between control of iron metabolism and the response to NO effects.
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Affiliation(s)
- Benoit D'Autreaux
- Laboratoire de Physicochimie des Métaux en Biologie (Formation de Recherche en Evolution-Université Joseph Fourier-Commissariat à l'Energie Atomique-Centre National de la Recherche Scientifique no. 2427), Grenoble, F-38054 Grenoble Cedex 9, France
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Franza T, Michaud-Soret I, Piquerel P, Expert D. Coupling of iron assimilation and pectinolysis in Erwinia chrysanthemi 3937. Mol Plant Microbe Interact 2002; 15:1181-1191. [PMID: 12423024 DOI: 10.1094/mpmi.2002.15.11.1181] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two major virulence determinants of the plant-pathogenic enterobacterium Erwinia chrysanthemi strain 3937 are the production of pectate lyase enzymes that degrade plant cell walls and expression of two high-affinity iron uptake systems mediated by two structurally unrelated siderophores, chrysobactin and achromobactin. Low iron availability is a signal that triggers transcription of the genes encoding pectate lyases PelD and PelE as well as that of genes involved in iron transport. This metalloregulation is mediated by the transcriptional repressor Fur. In this study, we analyzed the molecular mechanisms of this control. We purified the Erwinia chrysanthemi Fur protein. Band shift assays showed that Fur specifically binds in vitro to the regulatory regions of the genes encoding the ferrichrysobactin outer membrane receptor Fct and the pectate lyases PelD and PelE. We identified the Fur-binding sites of these promoter regions by performing DNase I footprinting experiments. From these data, we propose that Fur could inhibit the activation of the pelD and pelE genes by the cAMP receptor protein CRP according to an anti-activation mechanism. To identify other possible effectors involved in this control, we screened a bank of insertion mutants for an increase in transcriptional activity of pelD and fct genes in response to iron limitation. We isolated a mutant affected in the kdgK gene encoding the 2-keto-3-deoxygluconate (KDG) kinase, an enzyme involved in pectin catabolism. The growth of this mutant in the presence of pectic compounds led to a constitutive expression of iron transport genes as well as complete derepression of the pectinolysis genes. This effect was caused by intracellular accumulation of KDG. However, the derepression of iron transport genes by KDG does not involve the KdgR regulator of pectinolysis genes, which uses KDG as inducer. Thus, in Erwinia chrysanthemi, iron depletion or presence of KDG induces transcription of the genes involved in iron assimilation and pectinolysis. These important pathogenicity functions are coregulated by responding to common signals encountered in planta.
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Affiliation(s)
- Thierry Franza
- Laboratoire de Pathologie Végétale UMR 217 INRA/INA-PG/Université Paris 6, France.
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Le Pape L, Perret E, Michaud-Soret I, Latour JM. Magnetization studies of the active and fluoride-inhibited derivatives of the reduced catalase of Lactobacillus plantarum: toward a general picture of the anion-inhibited and active forms of the reduced dimanganese catalases. J Biol Inorg Chem 2002; 7:445-50. [PMID: 11941502 DOI: 10.1007/s00775-001-0319-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2001] [Accepted: 11/07/2001] [Indexed: 10/27/2022]
Abstract
The magnetic properties of the reduced catalase from Lactobacillus plantarum have been studied for the active enzyme and its fluoride complex through variable field/variable temperature magnetization measurements. The magnetic exchange interaction deduced from these experiments [fluoride complex: - J=1.3(1) cm(-1); active enzyme: - J=5.6(5) cm(-1); H=-2 J S(1) S(2)] are similar to those presently obtained in a re-analysis of the data for the corresponding forms of the Thermus thermophilus enzyme (previously published in 1997, Angew Chem Int Ed Engl 36:1626-1628): phosphate complex: - J=2.1(2) cm(-1); active enzyme - J=5.0(3) cm(-1). These results concur to a unified picture for the two enzymes, consistent with the presence of a hydroxide bridge in the reduced active catalases and its replacement by an aqua bridge in the anion-inhibited enzymes as the main mediators of the magnetic exchange.
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Affiliation(s)
- Laurent Le Pape
- DBMS/Laboratoire de Physicochimie des Métaux en Biologie, Département de Biologie Moléculaire et Structurale (FRE CEA-CNRS-UJF), CEA-Grenoble, 38054 Grenoble Cedex 9, France
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Gonzalez de Peredo A, Saint-Pierre C, Latour JM, Michaud-Soret I, Forest E. Conformational changes of the ferric uptake regulation protein upon metal activation and DNA binding; first evidence of structural homologies with the diphtheria toxin repressor. J Mol Biol 2001; 310:83-91. [PMID: 11419938 DOI: 10.1006/jmbi.2001.4769] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fur (ferric uptake regulation protein) is a bacterial global regulator that uses iron as a cofactor to bind to specific DNA sequences. It has been suggested that metal binding induces a conformational change in the protein, which is subsequently able to recognize DNA. This mechanism of activation has been investigated here using selective chemical modification monitored by mass spectrometry. The reactivity of each lysine residue of the Fur protein was studied, first in the apo form of the protein, then after metal activation and finally after DNA binding. Of particular interest is Lys76, which was shown to be highly protected from modification in the presence of target DNA. Hydrogen-deuterium exchange experiments were performed to map with higher resolution the conformational changes induced by metal binding. On the basis of these results, together with a secondary structure prediction, the presence in Fur of a non-classical helix-turn-helix motif is proposed. Experimental results show that activation upon metal binding induces conformational modification of this specific motif. The recognition helix, interacting directly with the major groove of the DNA, would include the domain [Y55-F61]. This helix would be followed by a small "wing" formed between two beta strands, containing Lys76, which might interact directly with DNA. These results suggest that Fur and DtxR (diphtheria toxin repressor), another bacterial repressor, share not only the function of being iron concentration regulators, and the structure of their DNA-binding domain.
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Affiliation(s)
- A Gonzalez de Peredo
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale, (UMR 5075 CEA/CNRS/UJF), Grenoble Cedex 1, F-38027, France
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Jacquamet L, Dole F, Jeandey C, Oddou JL, Perret E, Le Pape L, Aberdam D, Hazemann JL, Michaud-Soret I, Latour JM. First Spectroscopic Characterization of FeII-Fur, the Physiological Active Form of the Fur Protein. J Am Chem Soc 2000. [DOI: 10.1021/ja991932+] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gonzalez de Peredo A, Saint-Pierre C, Adrait A, Jacquamet L, Latour JM, Michaud-Soret I, Forest E. Identification of the two zinc-bound cysteines in the ferric uptake regulation protein from Escherichia coli: chemical modification and mass spectrometry analysis. Biochemistry 1999; 38:8582-9. [PMID: 10387106 DOI: 10.1021/bi9902283] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Selective chemical modification of thiol groups combined with mass spectrometry analysis was used to characterize cysteine ligands in the zinc-binding site of the Fur protein. Fur is a metalloregulatory protein involved in the regulation of almost all bacterial genes related to iron uptake in Gram-negative bacteria such as Escherichia coli. In addition to the iron site, Fur also possesses a tight-binding zinc site that likely comprises two cysteines. Using a new procedure, we confirm the involvement of two cysteines in zinc binding and identify them within the two pairs of cysteines present in the protein. The protein was treated under nondenaturing conditions with iodoacetamide, and the progressive alkylation of the thiol groups monitored by quenching the reaction at different times and measuring the extent of alkylation by mass spectrometry. Complementary experiments were carried out in the absence or presence of EDTA, a strong zinc chelator, to determine which of the cysteines were protected from alkylation by the zinc atom. Enzymatic digestion of the modified protein and analysis of the peptide mixture by mass spectrometry enabled fast identification of reactive and protected thiol groups. Two cysteines, Cys92 and Cys95, were thus assigned as zinc ligands. Examination of the sequence comprising the zinc site indicates that it may belong to a new type of structural zinc site. Furthermore, Cys132 was shown to be the fastest reacting cysteine, implying it is a surface-exposed residue.
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Affiliation(s)
- A Gonzalez de Peredo
- Laboratoire de Spectrométrie de Masse des Protéines, Institut de Biologie Structurale, 38027 Grenoble Cedex 1, France
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Adrait A, Jacquamet L, Le Pape L, Gonzalez de Peredo A, Aberdam D, Hazemann JL, Latour JM, Michaud-Soret I. Spectroscopic and saturation magnetization properties of the manganese- and cobalt-substituted Fur (ferric uptake regulation) protein from Escherichia coli. Biochemistry 1999; 38:6248-60. [PMID: 10320354 DOI: 10.1021/bi9823232] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Fur apoprotein has been purified and reconstituted with Co2+ and Mn2+ ions. These samples have been analyzed by UV-visible, EPR, and 1H NMR spectroscopies, by XAS, and by magnetization measurements. The apo-Fur protein is able to bind one metal dication (Co2+ or Mn2+) per monomer. A saturation magnetization study confirms the presence of a high-spin metal dication [Mn(II) S = 5/2 and Co(II) S = 3/2]. The two metal ions per Fur dimer are not in magnetic interaction (|J| < 0.1 cm-1 ). The UV-visible spectrum of the cobalt-substituted form (Co-Fur) presents two main bands at 660 nm and 540(br) nm with epsilon540 nm = 65 M-1 cm-1. The EPR spectrum gives the following g values: gx = 5.0(5), gy = 4.0(2), and gz = 2. 3(1), which are in accordance with a nearly axial (E/D < 0.11) site. The value of 55 cm-1 for the splitting (Delta) between the ground and the first excited state has been derived from an EPR saturation study and is in agreement with magnetization data. The EXAFS data of Co-Fur indicate a metal environment comprising five nitrogen/oxygen atoms at 2.11 A, the absence of sulfur, and the presence of histidines as ligands. 1H NMR of Co-Fur in H2O and D2O shows at least two exchangeable signals coming from histidine NH protons and shows the signature of carboxylate group(s). The combined spectroscopic data allow us to propose that the main metal site of Fur in Co-Fur contains at least two histidines, at least one aspartate or glutamate, and no cysteine as ligands and is in an axially distorted octahedral environment.
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Affiliation(s)
- A Adrait
- Laboratoire de Chimie de Coordination (Unité de Recherche Associée au CNRS No. 1194), Service de Chimie Inorganique et Biologique, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 38054 Grenoble Cedex 9, France
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Affiliation(s)
- Lars Öhrström
- Institutionen för Oorganisk kemi, Chalmers Tekniska Högskola, SE-412 96 Göteborg, Sweden, and CEA/Département de Recherche Fondamentale sur la Matière Condensée, Service de Chimie Inorganique et Biologique, Laboratoire de Chimie de Coordination (Unité de Recherche Associée au CNRS No 1194), CEA-Grenoble, F-38054 Grenoble cedex 9, France
| | - Isabelle Michaud-Soret
- Institutionen för Oorganisk kemi, Chalmers Tekniska Högskola, SE-412 96 Göteborg, Sweden, and CEA/Département de Recherche Fondamentale sur la Matière Condensée, Service de Chimie Inorganique et Biologique, Laboratoire de Chimie de Coordination (Unité de Recherche Associée au CNRS No 1194), CEA-Grenoble, F-38054 Grenoble cedex 9, France
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Michaud-Soret I, Jacquamet L, Debaecker-Petit N, Le Pape L, Barynin VV, Latour JM. The Existence of Two Oxidized Mn(III)Mn(III) Forms of Thermus thermophilus Manganese Catalase. Inorg Chem 1998; 37:3874-3876. [PMID: 11670494 DOI: 10.1021/ic9712176] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Isabelle Michaud-Soret
- Département de Recherche Fondamentale sur la Matière Condensée, Service de Chimie Inorganique et Biologique, Laboratoire de Chimie de Coordination (Unité de Recherche Associée au CNRS 1194), CEA-Grenoble, F-38054 Grenoble, France, Institute of Crystallography, Russian Academy of Sciences, Moscow, Russia, and Krebs Institute, Department of Molecular Biology & Biotechnology, University of Sheffield, Sheffield S10 2TN, U.K
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Jacquamet L, Aberdam D, Adrait A, Hazemann JL, Latour JM, Michaud-Soret I. X-ray absorption spectroscopy of a new zinc site in the fur protein from Escherichia coli. Biochemistry 1998; 37:2564-71. [PMID: 9485406 DOI: 10.1021/bi9721344] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The zinc K-edge X-ray absorption spectra of the Fur (ferric uptake regulation) protein isolated from Escherichia coli have been analyzed in frozen solution to determine details of the zinc coordination. The spectra of apoFur and of the cobalt-substituted protein have been analyzed and compared in order to see the influence of the cobalt incorporation on the geometry of the zinc site. EXAFS analysis gave for both samples (apoFur and CoFur) a tetrahedral environment for the zinc atom with two sulfur donor ligands at a distance of 2.3 A from the zinc and two N/O donor ligands at 2.0 A. The two sulfur donor ligands are probably two of the four cysteines present in each Fur monomer and could be Cys92 and Cys95, which are known from mutagenesis studies to be essential for Fur activity [Coy, M., Doyle, C., Besser, J., and Neilands, J. B. (1994) BioMetals 7, 292-298]. The distances obtained from our fits were always too short to be compatible with penta or hexa coordination. The typical pattern observed for the Fourier transform of the EXAFS oscillations suggests the presence of at least one imidazole ligand. The XANES of these two forms of the protein are similar but significantly different. This suggests a change of the conformation of the zinc site upon cobalt incorporation. The present study provides the first unambiguous evidence for the presence of a structural zinc site in the Fur protein from Escherichia coli.
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Affiliation(s)
- L Jacquamet
- Departement de Recherche Fondamentale sur la Matiere Condensee, Service de Chimie Inorganique et Biologique, Laboratoire de Chimie de Coordination (Unite de Recherche Associee au CNRS No.1194), CEA-Grenoble, 38054 Grenoble Cedex 9, France
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Michaud-Soret I, Adrait A, Jaquinod M, Forest E, Touati D, Latour JM. Electrospray ionization mass spectrometry analysis of the apo- and metal-substituted forms of the Fur protein. FEBS Lett 1997; 413:473-6. [PMID: 9303558 DOI: 10.1016/s0014-5793(97)00963-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Fur has been purified and reconstituted with Co2+ and Mn2+. The ESI-MS spectra of the apoprotein as well as Mn-Fur and Co-Fur under acidic denaturating conditions showed the existence of two species of molecular mass 16,660 +/- 3 and 16,792 +/- 3 Da, which correspond, respectively, to the N-terminal methionine 'excised' or 'non-excised' forms of the monomer. This result proves the absence of any other post-translational modification or modification due to metal incorporation. On the other hand, under soft conditions, ESI spectra provided for the first time direct evidence for dimeric metal-containing forms in solution.
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Affiliation(s)
- I Michaud-Soret
- Département de Recherche Fondamentale sur la Matière Condensée, (Unité de Recherche Associée au CNRS No. 1194), CEA-Grenoble, France.
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Jacquamet L, Michaud-Soret I, Debaecker-Petit N, Latour JM, Barynin VV, Zimmermann JL. Magnetization Studies of the Reduced Active Form of the Catalase fromThermus thermophilus. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/anie.199716261] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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Jacquamet L, Michaud-Soret I, Debaecker-Petit N, Barynin VV, Zimmermann JL, Latour JM. Magnetisierungsstudien zur strukturellen Charakterisierung der reduzierten aktiven Form der Katalase vonThermus thermophilus. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971091515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Öhrström L, Michaud-Soret I. Quantum Chemical Approach to the Assignment of Iron−Catecholate Vibrations and Isotopic Substitution Shifts. J Am Chem Soc 1996. [DOI: 10.1021/ja953409a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lars Öhrström
- CEA/Département de Recherche Fondamentale sur la Matière Condensée CNRS/Laboratoire de Chimie de Coordination (URA 1194) SCIB, Centre d'Etudes Nucléaires de Grenoble F-38054 Grenoble cedex 9, France
| | - Isabelle Michaud-Soret
- CEA/Département de Recherche Fondamentale sur la Matière Condensée CNRS/Laboratoire de Chimie de Coordination (URA 1194) SCIB, Centre d'Etudes Nucléaires de Grenoble F-38054 Grenoble cedex 9, France
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Michaud-Soret I, Adrait A, Debaecker N, Latour JM, Touati D. Spectroscopic and saturation magnetization studies of the manganese and cobalt substituted fur protein from E. coli. J Inorg Biochem 1995. [DOI: 10.1016/0162-0134(95)97209-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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50
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Michaud-Soret I, Andersson KK, Que L, Haavik J. Resonance Raman studies of catecholate and phenolate complexes of recombinant human tyrosine hydroxylase. Biochemistry 1995; 34:5504-10. [PMID: 7727409 DOI: 10.1021/bi00016a022] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Human tyrosine hydroxylase isoform 1 (hTH1) was expressed in Escherichia coli, purified as the apoenzyme, and reconstituted with iron. The resonance Raman spectra of hTH1 complexed with dopamine, noradrenaline, tyramine, and catechol have been studied and compared to those obtained for TH isolated from bovine adrenal glands or rat phaeochromocytoma tissue. A TH-phenolate complex is reported for the first time. Using dopamine selectively 18O-labeled in the 3-position or both 3- and 4-hydroxy positions, we have been able to assign unambiguously the origin of the low-frequency vibration bands: the band at 631 cm-1 involves the oxygen in the 4-position; the band at 592 cm-1 involves the oxygen in the 3-position, and the band around 528 cm-1 is shifted by both, suggesting a chelated mode vibration. A small shift of the 1275 cm-1 band and no shift of the 1320 cm-1 band were observed, showing that those two bands involve essentially ring vibrations of the catecholate moiety, rather than the C--O stretching vibration as previously suggested. The spectrum of the catechol-d6-hTH1 complex confirms this assignment. The resonance Raman spectra of the 54Fe, 56Fe, or 57Fe isotope-containing enzymes complexed with dopamine are virtually identical, showing that the component of the iron in the approximately 600 cm-1 vibrations is too small to be observed. These results provide a better understanding of the Raman properties of iron-catecholate complexes in this enzyme, as well as in other metalloproteins and model compounds.
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Affiliation(s)
- I Michaud-Soret
- Department of Chemistry, University of Minnesota, Minneapolis 55455, USA
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