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Milić JV, Schneeberger T, Zalibera M, Diederich F, Boudon C, Ruhlmann L. Spectro-electrochemical toolbox for monitoring and controlling quinone-mediated redox-driven molecular gripping. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Siemer N, Lüken A, Zalibera M, Frenzel J, Muñoz-Santiburcio D, Savitsky A, Lubitz W, Muhler M, Marx D, Strunk J. Atomic-Scale Explanation of O2 Activation at the Au–TiO2 Interface. J Am Chem Soc 2018; 140:18082-18092. [DOI: 10.1021/jacs.8b10929] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Niklas Siemer
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Alexander Lüken
- Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Michal Zalibera
- Max-Planck-Institut für Chemische Energiekonversion, 45470 Mülheim/Ruhr, Germany
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, SK-812 37 Bratislava, Slovakia
| | - Johannes Frenzel
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | | | - Anton Savitsky
- Fakultät Physik, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, 45470 Mülheim/Ruhr, Germany
| | - Martin Muhler
- Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Jennifer Strunk
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, 18059 Rostock, Germany
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Kopka B, Magerl K, Savitsky A, Davari MD, Röllen K, Bocola M, Dick B, Schwaneberg U, Jaeger KE, Krauss U. Electron transfer pathways in a light, oxygen, voltage (LOV) protein devoid of the photoactive cysteine. Sci Rep 2017; 7:13346. [PMID: 29042655 PMCID: PMC5645311 DOI: 10.1038/s41598-017-13420-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 09/21/2017] [Indexed: 11/17/2022] Open
Abstract
Blue-light absorption by the flavin chromophore in light, oxygen, voltage (LOV) photoreceptors triggers photochemical reactions that lead to the formation of a flavin-cysteine adduct. While it has long been assumed that adduct formation is essential for signaling, it was recently shown that LOV photoreceptor variants devoid of the photoactive cysteine can elicit a functional response and that flavin photoreduction to the neutral semiquinone radical is sufficient for signal transduction. Currently, the mechanistic basis of the underlying electron- (eT) and proton-transfer (pT) reactions is not well understood. We here reengineered pT into the naturally not photoreducible iLOV protein, a fluorescent reporter protein derived from the Arabidopsis thaliana phototropin-2 LOV2 domain. A single amino-acid substitution (Q489D) enabled efficient photoreduction, suggesting that an eT pathway is naturally present in the protein. By using a combination of site-directed mutagenesis, steady-state UV/Vis, transient absorption and electron paramagnetic resonance spectroscopy, we investigate the underlying eT and pT reactions. Our study provides strong evidence that several Tyr and Trp residues, highly conserved in all LOV proteins, constitute the eT pathway for flavin photoreduction, suggesting that the propensity for photoreduction is evolutionary imprinted in all LOV domains, while efficient pT is needed to stabilize the neutral semiquinone radical.
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Affiliation(s)
- Benita Kopka
- Institut für Molekulare Enzymtechnologie, Heinrich-Heine-Universität Düsseldorf, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Kathrin Magerl
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053, Regensburg, Germany
| | - Anton Savitsky
- Max Planck Institute for Chemical Energy Conversion, 45470, Mülheim an der Ruhr, Germany
| | - Mehdi D Davari
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074, Aachen, Germany
| | - Katrin Röllen
- Institut für Molekulare Enzymtechnologie, Heinrich-Heine-Universität Düsseldorf, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Marco Bocola
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074, Aachen, Germany
| | - Bernhard Dick
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053, Regensburg, Germany
| | - Ulrich Schwaneberg
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074, Aachen, Germany.,DWI-Leibniz Institute for Interactive Materials, Forckenbeckstraße 50, 52056, Aachen, Germany
| | - Karl-Erich Jaeger
- Institut für Molekulare Enzymtechnologie, Heinrich-Heine-Universität Düsseldorf, Forschungszentrum Jülich, 52426, Jülich, Germany.,IBG-1: Biotechnologie, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Ulrich Krauss
- Institut für Molekulare Enzymtechnologie, Heinrich-Heine-Universität Düsseldorf, Forschungszentrum Jülich, 52426, Jülich, Germany.
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Simon U, Alarcón Villaseca S, Shang H, Levchenko SV, Arndt S, Epping JD, Görke O, Scheffler M, Schomäcker R, van Tol J, Ozarowski A, Dinse KP. Li/MgO Catalysts Doped with Alio-valent Ions. Part II: Local Topology Unraveled by EPR/NMR and DFT Modeling. ChemCatChem 2017. [DOI: 10.1002/cctc.201700610] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ulla Simon
- Technische Universität Berlin; Institut für Werkstoffwissenschaften und -technologien, Fachgebiet Keramische Werkstoffe; Hardenbergstraße 40 10623 Berlin Germany
| | | | - Honghui Shang
- Fritz-Haber-Institut der Max Planck Gesellschaft; Theory Department; Faradayweg 4-6 14195 Berlin Germany
| | - Sergey V. Levchenko
- Fritz-Haber-Institut der Max Planck Gesellschaft; Theory Department; Faradayweg 4-6 14195 Berlin Germany
| | - Sebastian Arndt
- Technische Universität Berlin; Institut für Chemie; Straße des 17.Juni 124 10623 Berlin Germany
| | - Jan D. Epping
- Technische Universität Berlin; Institut für Chemie; Straße des 17.Juni 135 10623 Berlin Germany
| | - Oliver Görke
- Technische Universität Berlin; Institut für Werkstoffwissenschaften und -technologien, Fachgebiet Keramische Werkstoffe; Hardenbergstraße 40 10623 Berlin Germany
| | - Matthias Scheffler
- Fritz-Haber-Institut der Max Planck Gesellschaft; Theory Department; Faradayweg 4-6 14195 Berlin Germany
| | - Reinhard Schomäcker
- Technische Universität Berlin; Institut für Chemie; Straße des 17.Juni 124 10623 Berlin Germany
| | - Johan van Tol
- National High Magnetic Field Laboratory; 1800 E. Paul Dirac Dr. Tallahassee FL 32310 USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory; 1800 E. Paul Dirac Dr. Tallahassee FL 32310 USA
| | - Klaus-Peter Dinse
- Freie Universität Berlin; Fachbereich Physik; Arnimallee 14 14195 Berlin Germany
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Milić J, Zalibera M, Pochorovski I, Trapp N, Nomrowski J, Neshchadin D, Ruhlmann L, Boudon C, Wenger OS, Savitsky A, Lubitz W, Gescheidt G, Diederich F. Paramagnetic Molecular Grippers: The Elements of Six-State Redox Switches. J Phys Chem Lett 2016; 7:2470-2477. [PMID: 27300355 DOI: 10.1021/acs.jpclett.6b01094] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The development of semiquinone-based resorcin[4]arene cavitands expands the toolbox of switchable molecular grippers by introducing the first paramagnetic representatives. The semiquinone (SQ) states were generated electrochemically, chemically, and photochemically. We analyzed their electronic, conformational, and binding properties by cyclic voltammetry, ultraviolet/visible (UV/vis) spectroelectrochemistry, electron paramagnetic resonance (EPR) and transient absorption spectroscopy, in conjunction with density functional theory (DFT) calculations. The utility of UV/vis spectroelectrochemistry and EPR spectroscopy in evaluating the conformational features of resorcin[4]arene cavitands is demonstrated. Guest binding properties were found to be enhanced in the SQ state as compared to the quinone (Q) or the hydroquinone (HQ) states of the cavitands. Thus, these paramagnetic SQ intermediates open the way to six-state redox switches provided by two conformations (open and closed) in three redox states (Q, SQ, and HQ) possessing distinct binding ability. The switchable magnetic properties of these molecular grippers and their responsiveness to electrical stimuli has the potential for development of efficient molecular devices.
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Affiliation(s)
- Jovana Milić
- Laboratory of Organic Chemistry, ETH Zurich , Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Michal Zalibera
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava, Faculty of Chemical and Food Technology , Radlinského 9, 81237 Bratislava, Slovak Republic
| | - Igor Pochorovski
- Laboratory of Organic Chemistry, ETH Zurich , Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Nils Trapp
- Laboratory of Organic Chemistry, ETH Zurich , Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Julia Nomrowski
- Department of Chemistry, University of Basel , St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Dmytro Neshchadin
- Institute of Physical and Theoretical Chemistry, NAWI Graz, Graz University of Technology , Stremayrgasse 9/Z2, 8010 Graz, Austria
| | - Laurent Ruhlmann
- Université de Strasbourg, Laboratoire d'Électrochimie et Chimie Physique du Corps Solide, Institut de Chimie de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg, France
| | - Corinne Boudon
- Université de Strasbourg, Laboratoire d'Électrochimie et Chimie Physique du Corps Solide, Institut de Chimie de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg, France
| | - Oliver S Wenger
- Department of Chemistry, University of Basel , St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Anton Savitsky
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Georg Gescheidt
- Institute of Physical and Theoretical Chemistry, NAWI Graz, Graz University of Technology , Stremayrgasse 9/Z2, 8010 Graz, Austria
| | - François Diederich
- Laboratory of Organic Chemistry, ETH Zurich , Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
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Lahti PM. Structure–property relationships for metal-free organic magnetic materials. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-386047-7.00003-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sugisaki K, Toyota K, Sato K, Shiomi D, Kitagawa M, Takui T. Ab initio and DFT studies of the spin–orbit and spin–spin contributions to the zero-field splitting tensors of triplet nitrenes with aryl scaffolds. Phys Chem Chem Phys 2011; 13:6970-80. [DOI: 10.1039/c0cp02809f] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hofbauer W, Bittl R. A novel approach to separating EPR lines arising from species with different transition moments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2000; 147:226-231. [PMID: 11097813 DOI: 10.1006/jmre.2000.2202] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In pulsed EPR, spectral contributions from several species in one sample can be separated based on different EPR transition probabilities. This is usually done by monitoring the Rabi nutations in a 2D experiment. By using long pulses, the FID and echo shapes of species with different transition probabilities differ significantly, including temporal shifts of the observed echo signals in a two-pulse ESE experiment. These shifts can be used to disentangle spectral components in a 1D field-swept ESE experiment by choosing an appropriate detection time. This approach is demonstrated by experiments on a sample containing Mn(2+) and Cr(3+) centers as well as on an exchange-coupled Mn(III)/Mn(IV) system with Mn(2+) contaminations.
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Affiliation(s)
- W Hofbauer
- Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, 10623 Berlin, Germany
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Tregenna-Piggott PLW, Noble CJ, Pilbrow JR. The study of the influence of Jahn-Teller coupling and low symmetry strain on the anomalous electron paramagnetic resonance spectrum of titanium(III) doped CsAl(SO4)2⋅12H2O. J Chem Phys 2000. [DOI: 10.1063/1.1287281] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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PONTI A. Physical mechanisms of spin echoes. I. Two-pulse locked echo. Mol Phys 2000. [DOI: 10.1080/00268970009483352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mizuochi N, Ohba Y, Yamauchi S. First Observation of the Photoexcited Quintet State in Fullerene Linked with Two Nitroxide Radicals. J Phys Chem A 1999. [DOI: 10.1021/jp9922559] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Mizuochi N, Ohba Y, Yamauchi S. The structure and electronic state of photoexcited fullerene linked with a nitroxide radical based on an analysis of a two-dimensional electron paramagnetic resonance nutation spectrum. J Chem Phys 1999. [DOI: 10.1063/1.479670] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Stoll S, Jeschke G, Willer M, Schweiger A. Nutation-Frequency Correlated EPR Spectroscopy: The PEANUT Experiment. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1998; 130:86-96. [PMID: 9469902 DOI: 10.1006/jmre.1997.1285] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The phase-inverted echo-amplitude detected nutation (PEANUT) experiment for the measurement of transient electron spin nutation frequencies is introduced. In this new pulse sequence, nutation refocused to a rotary echo is detected via the amplitude modulation of a primary electron spin echo. Since detection and excitation of the nutation are fully separated in time, experiments at very high nutation frequencies become feasible. The nutation frequencies which are proportional to the transition moment of an EPR transition can be used to label individual EPR lines by an additional parameter. Using a two-dimensional PEANUT experiment which correlates the nutation frequencies with the resonance fields, the interpretation of complicated field-swept EPR spectra can considerably be simplified. A theoretical description of the experiment is given and the inner working of the approach is described. The predicted features of PEANUT spectra are verified experimentally and examples of applications to both ordered and disordered systems are given. Copyright 1998 Academic Press. Copyright 1998 Academic Press
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Affiliation(s)
- S Stoll
- Laboratorium fur Physikalische Chemie, Eidgenossische Technische Hochschule, Zurich, 8092, Switzerland
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