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Vos MH, Salman M, Ramodiharilafy R, Liebl U. Fluorescent iron‑sulfur centers: Photochemistry of the PetA Rieske protein from Aquifex aeolicus. Biochim Biophys Acta Bioenerg 2021; 1862:148385. [PMID: 33516769 DOI: 10.1016/j.bbabio.2021.148385] [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] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 01/12/2021] [Accepted: 01/22/2021] [Indexed: 11/28/2022]
Abstract
Cytochrome bc1 complexes are energy-transducing enzymes and key components of respiratory electron chains. They contain Rieske 2Fe2S proteins that absorb very weakly in the visible absorption region compared to the heme cofactors of the cytochromes, but are known to yield photoproducts. Here, the photoreactions of isolated Rieske proteins from the hyperthermophilic bacterium Aquifex aeolicus are studied in two redox states using ultrafast transient fluorescence and absorption spectroscopy. We provide evidence, for the first time in iron‑sulfur proteins, of very weak fluorescence of the excited state, in the oxidized as well as the reduced state. The excited states of the oxidized and reduced forms decay in 1.5 ps and 30 ps, respectively. In both cases they give rise to product states with lifetimes beyond 1 ns, reflecting photo-reduction of oxidized centers as well as photo-oxidation of reduced centers. Potential reaction partners are discussed and studied using site-directed mutagenesis. For the reduced state, a nearby disulfide bridge is suggested as an electron acceptor. The resulting photoproducts in either state may play a role in photoactivation processes.
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Affiliation(s)
- Marten H Vos
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France.
| | - Mayla Salman
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Rivo Ramodiharilafy
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Ursula Liebl
- LOB, CNRS, INSERM, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
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Salman M, Villamil Franco C, Ramodiharilafy R, Liebl U, Vos MH. Interaction of the Full-Length Heme-Based CO Sensor Protein RcoM-2 with Ligands. Biochemistry 2019; 58:4028-4034. [PMID: 31502443 DOI: 10.1021/acs.biochem.9b00623] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The heme-based and CO-responsive RcoM transcriptional regulators from Burkholderia xenovorans are known to display an extremely high affinity for CO while being insensitive to O2. We have quantitatively characterized the heme-CO interaction in full-length RcoM-2 and compared it with the isolated heme domain RcoMH-2 to establish the origin of these characteristics. Whereas the CO binding rates are similar to those of other heme-based sensor proteins, the dissociation rates are two to three orders of magnitude lower. The latter property is tuned by the yield of CO escape from the heme pocket after disruption of the heme-CO bond, as determined by ultrafast spectroscopy. For the full-length protein this yield is ∼0.5%, and for the isolated heme domain it is even lower, associated with correspondingly faster CO rebinding kinetics, leading to Kd values of 4 and 0.25 nM, respectively. These differences imply that the presence of the DNA-binding domain influences the ligand-binding properties of the heme domain, thus abolishing the observed quasi-irreversibility of CO binding to the isolated heme domain. RcoM-2 binds target DNA with high affinity (Kd < 2 nM) when CO is bound to the heme, and the presence of DNA also influences the heme-CO rebinding kinetics. The functional implications of our findings are discussed.
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Affiliation(s)
- Mayla Salman
- LOB, CNRS, INSERM, Ecole Polytechnique , Institut Polytechnique de Paris , 91128 Palaiseau , France
| | - Carolina Villamil Franco
- LOB, CNRS, INSERM, Ecole Polytechnique , Institut Polytechnique de Paris , 91128 Palaiseau , France
| | - Rivo Ramodiharilafy
- LOB, CNRS, INSERM, Ecole Polytechnique , Institut Polytechnique de Paris , 91128 Palaiseau , France
| | - Ursula Liebl
- LOB, CNRS, INSERM, Ecole Polytechnique , Institut Polytechnique de Paris , 91128 Palaiseau , France
| | - Marten H Vos
- LOB, CNRS, INSERM, Ecole Polytechnique , Institut Polytechnique de Paris , 91128 Palaiseau , France
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Abdesselem M, Ramodiharilafy R, Devys L, Gacoin T, Alexandrou A, Bouzigues CI. Fast quantitative ROS detection based on dual-color single rare-earth nanoparticle imaging reveals signaling pathway kinetics in living cells. Nanoscale 2017; 9:656-665. [PMID: 27942670 DOI: 10.1039/c6nr07413h] [Citation(s) in RCA: 16] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Reactive oxygen species (ROS), and notably hydrogen peroxide H2O2, are cellular second messengers that are known to control a variety of signaling processes. They can finely regulate the dynamics of signal transduction, cell response and ultimately tissue function. However, there are very few local, quantitative and time-resolved descriptions of their cellular organization at the scale of molecular reactions, due to the lack of efficient sensors. We thus developed a novel nanoprobe-based ROS detection system using the simultaneous imaging of single lanthanide nanoparticles (YAG:Ce and chemically reduced Gd0.6Eu0.4VO4). We reveal that both particle luminescence signals are controlled by their H2O2 local environment. By simultaneously tracking their luminescence, we devised a new approach providing a quantitative (0.5 μM accuracy in the 1-10 μM range) H2O2 measurement with a 500 ms time resolution, surpassing all existing methods by two orders of magnitude, and revealing previously inaccessible molecular events controlling ROS concentration. We used this nanoprobe in living cells to track fast signaling pathways, by measuring the dynamics of H2O2 intracellular concentrations, induced by endothelin-1 (ET-1) stimulation. We thus revealed the mechanisms controlling ROS production, notably the activity modulation of the ROS-producing enzyme NADPH oxidase by fast (<10 s) EGFR transactivation, and measured quantitatively their kinetic parameters through a minimal analytical model. Altogether, these results illustrate how lanthanide nanoparticle-based sensors are a powerful tool to dynamically probe molecular mechanisms shaping the oxidative cell response.
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Affiliation(s)
- M Abdesselem
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - R Ramodiharilafy
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - L Devys
- Laboratory of Condensed Matter Physics, Ecole Polytechnique, CNRS UMR7643 and Universite Paris-Saclay, 91120 Palaiseau, France
| | - T Gacoin
- Laboratory of Condensed Matter Physics, Ecole Polytechnique, CNRS UMR7643 and Universite Paris-Saclay, 91120 Palaiseau, France
| | - A Alexandrou
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - C I Bouzigues
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
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Abdesselem M, Schoeffel M, Maurin I, Ramodiharilafy R, Autret G, Clément O, Tharaux PL, Boilot JP, Gacoin T, Bouzigues C, Alexandrou A. Correction to multifunctional rare-earth vanadate nanoparticles: luminescent labels, oxidant sensors, and MRI contrast agents. ACS Nano 2015; 9:4660. [PMID: 25844799 DOI: 10.1021/acsnano.5b01924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Abdesselem M, Schoeffel M, Maurin I, Ramodiharilafy R, Autret G, Clément O, Tharaux PL, Boilot JP, Gacoin T, Bouzigues C, Alexandrou A. Multifunctional rare-Earth vanadate nanoparticles: luminescent labels, oxidant sensors, and MRI contrast agents. ACS Nano 2014; 8:11126-11137. [PMID: 25290552 DOI: 10.1021/nn504170x] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Collecting information on multiple pathophysiological parameters is essential for understanding complex pathologies, especially given the large interindividual variability. We report here multifunctional nanoparticles which are luminescent probes, oxidant sensors, and contrast agents in magnetic resonance imaging (MRI). Eu(3+) ions in an yttrium vanadate matrix have been demonstrated to emit strong, nonblinking, and stable luminescence. Time- and space-resolved optical oxidant detection is feasible after reversible photoreduction of Eu(3+) to Eu(2+) and reoxidation by oxidants, such as H2O2, leading to a modulation of the luminescence emission. The incorporation of paramagnetic Gd(3+) confers in addition proton relaxation enhancing properties to the system. We synthesized and characterized nanoparticles of either 5 or 30 nm diameter with compositions of GdVO4 and Gd0.6Eu0.4VO4. These particles retain the luminescence and oxidant detection properties of YVO4:Eu. Moreover, the proton relaxivity of GdVO4 and Gd0.6Eu0.4VO4 nanoparticles of 5 nm diameter is higher than that of the commercial Gd(3+) chelate compound Dotarem at 20 MHz. Nuclear magnetic resonance dispersion spectroscopy showed a relaxivity increase above 10 MHz. Complexometric titration indicated that rare-earth leaching is negligible. The 5 nm nanoparticles injected in mice were observed with MRI to concentrate in the liver and the bladder after 30 min. Thus, these multifunctional rare-earth vanadate nanoparticles pave the way for simultaneous optical and magnetic resonance detection, in particular, for in vivo localization evolution and reactive oxygen species detection in a broad range of physiological and pathophysiological conditions.
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Affiliation(s)
- Mouna Abdesselem
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique , CNRS UMR 7645-INSERM U696, 91128 Palaiseau Cedex, France
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Bouzigues C, Nguyên TL, Ramodiharilafy R, Claeson A, Tharaux PL, Alexandrou A. Regulation of the ROS Response Dynamics and Organization to PDGF Motile Stimuli Revealed by Single Nanoparticle Imaging. ACTA ACUST UNITED AC 2014; 21:647-56. [DOI: 10.1016/j.chembiol.2014.02.020] [Citation(s) in RCA: 9] [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] [Received: 12/04/2013] [Revised: 02/20/2014] [Accepted: 02/21/2014] [Indexed: 02/07/2023]
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Bouzigues CI, Nguyên TL, Casanova D, Ramodiharilafy R, Gacoin T, Boilot JP, Alexandrou A. Spatio-Temporal Patterns of Reactive Oxygen Species Production in PDGF Signaling Revealed by Nanoparticle Imaging in Living Cells. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.2270] [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: 11/30/2022] Open
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