1
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Xu Y, Peschel MT, Jänchen M, Foja R, Storch G, Thyrhaug E, de Vivie-Riedle R, Hauer J. Determining Excited-State Absorption Properties of a Quinoid Flavin by Polarization-Resolved Transient Spectroscopy. J Phys Chem A 2024; 128:3830-3839. [PMID: 38709806 PMCID: PMC11103687 DOI: 10.1021/acs.jpca.4c01260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 04/19/2024] [Accepted: 04/25/2024] [Indexed: 05/08/2024]
Abstract
As important naturally occurring chromophores, photophysical/chemical properties of quinoid flavins have been extensively studied both experimentally and theoretically. However, little is known about the transition dipole moment (TDM) orientation of excited-state absorption transitions of these important compounds. This aspect is of high interest in the fields of photocatalysis and quantum control studies. In this work, we employ polarization-associated spectra (PAS) to study the excited-state absorption transitions and the underlying TDM directions of a standard quinoid flavin compound. As compared to transient absorption anisotropy (TAA), an analysis based on PAS not only avoids diverging signals but also retrieves the relative angle for ESA transitions with respect to known TDM directions. Quantum chemical calculations of excited-state properties lead to good agreement with TA signals measured in magic angle configuration. Only when comparing experiment and theory for TAA spectra and PAS, do we find deviations when and only when the S0 → S1 of flavin is used as a reference. We attribute this to the vibronic coupling of this transition to a dark state. This effect is only observed in the employed polarization-controlled spectroscopy and would have gone unnoticed in conventional TA.
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Affiliation(s)
- Yi Xu
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Martin T. Peschel
- Department
of Chemistry, Ludwig-Maximilians-Universität
München, 81377 München, Germany
| | - Miriam Jänchen
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Richard Foja
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Golo Storch
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Erling Thyrhaug
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
| | | | - Jürgen Hauer
- TUM
School of Natural Sciences, Department of Chemistry and Catalysis
Research Center, Technical University of
Munich, Lichtenbergstraße 4, 85748 Garching, Germany
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2
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Gary S, Landry M, Bloom S. Spectral and Electrochemical Properties of Common Photocatalysts in Water: A Compendium for Aqueous Photoredox Catalysis. Synlett 2023; 34:1911-1914. [PMID: 38699236 PMCID: PMC11065426 DOI: 10.1055/a-2097-1051] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Electrochemical potentials of photocatalysts are solvent dependent. One of the largest discrepancies is observed when water is used in place of organic solvents as the reaction media. Unfortunately, the redox potentials for many photocatalysts in water have not been determined, at least under one unifying set of conditions, and this greatly hinders the rational design of sustainable and biocompatible photoredox reactions. Herein, we measure the spectral and electrochemical properties of the most common photoredox catalysts in water and catalog their absorption and fluorescence maxima and ground- and excited-state potentials.
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Affiliation(s)
- Samuel Gary
- Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
| | - Melinda Landry
- Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
| | - Steven Bloom
- Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
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3
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Müllerová L, Marková K, Obruča S, Mravec F. Use of Flavin-Related Cellular Autofluorescence to Monitor Processes in Microbial Biotechnology. Microorganisms 2022; 10:microorganisms10061179. [PMID: 35744697 PMCID: PMC9231254 DOI: 10.3390/microorganisms10061179] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 06/06/2022] [Indexed: 11/16/2022] Open
Abstract
Cellular autofluorescence is usually considered to be a negative phenomenon because it can affect the sensitivity of fluorescence microscopic or flow cytometric assays by interfering with the signal of various fluorescent probes. Nevertheless, in our work, we adopted a different approach, and green autofluorescence induced by flavins was used as a tool to monitor fermentation employing the bacterium Cupriavidus necator. The autofluorescence was used to distinguish microbial cells from abiotic particles in flow cytometry assays, and it was also used for the determination of viability or metabolic characteristics of the microbial cells. The analyses using two complementary techniques, namely fluorescence microscopy and flow cytometry, are simple and do not require labor sample preparation. Flavins and their autofluorescence can also be used in a combination with other fluorophores when the need for multi-parametrical analyses arises, but it is wise to use dyes that do not emit a green light in order to not interfere with flavins' emission band (500-550 nm).
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4
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Abatedaga I, Perez Mora B, Tuttobene M, Müller G, Biancotti D, Borsarelli CD, Valle L, Mussi MA. Characterization of BLUF-photoreceptors present in Acinetobacter nosocomialis. PLoS One 2022; 17:e0254291. [PMID: 35442978 PMCID: PMC9020721 DOI: 10.1371/journal.pone.0254291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Accepted: 03/01/2022] [Indexed: 11/18/2022] Open
Abstract
Acinetobacter nosocomialis is a Gram-negative opportunistic pathogen, whose ability to cause disease in humans is well recognized. Blue light has been shown to modulate important physiological traits related to persistence and virulence in this microorganism. In this work, we characterized the three Blue Light sensing Using FAD (BLUF) domain-containing proteins encoded in the A. nosocomialis genome, which account for the only canonical light sensors present in this microorganism. By focusing on a light-modulated bacterial process such as motility, the temperature dependence of light regulation was studied, as well as the expression pattern and spectroscopic characteristics of the different A. nosocomialis BLUFs. Our results show that the BLUF-containing proteins AnBLUF65 and AnBLUF46 encode active photoreceptors in the light-regulatory temperature range when expressed recombinantly. In fact, AnBLUF65 is an active photoreceptor in the temperature range from 15°C to 37°C, while AnBLUF46 between 15°C to 32°C, in vitro. In vivo, only the Acinetobacter baumannii BlsA’s ortholog AnBLUF65 was expressed in A. nosocomialis cells recovered from motility plates. Moreover, complementation assays showed that AnBLUF65 is able to mediate light regulation of motility in A. baumannii ΔblsA strain at 30°C, confirming its role as photoreceptor and in modulation of motility by light. Intra-protein interactions analyzed using 3D models built based on A. baumannii´s BlsA photoreceptor, show that hydrophobic/aromatic intra-protein interactions may contribute to the stability of dark/light- adapted states of the studied proteins, reinforcing the previous notion on the importance of these interactions in BLUF photoreceptors. Overall, the results presented here reveal the presence of BLUF photoreceptors in A. nosocomialis with idiosyncratic characteristics respect to the previously characterized A. baumannii’s BlsA, both regarding the photoactivity temperature-dependency as well as expression patterns, contributing thus to broaden our knowledge on the BLUF family.
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Affiliation(s)
- Inés Abatedaga
- Instituto de Bionanotecnología del NOA (INBIONATEC-CONICET), Universidad Nacional de Santiago del Estero (UNSE), Santiago del Estero, Argentina
| | - Bárbara Perez Mora
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Universidad Nacional de Rosario (UNR), Rosario, Argentina
| | - Marisel Tuttobene
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Universidad Nacional de Rosario (UNR), Rosario, Argentina
| | - Gabriela Müller
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Universidad Nacional de Rosario (UNR), Rosario, Argentina
| | - Daiana Biancotti
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Universidad Nacional de Rosario (UNR), Rosario, Argentina
| | - Claudio D. Borsarelli
- Instituto de Bionanotecnología del NOA (INBIONATEC-CONICET), Universidad Nacional de Santiago del Estero (UNSE), Santiago del Estero, Argentina
- Instituto de Ciencias Químicas (ICQ), Facultad de Agronomía y Agroindustrias (FAyA), UNSE, Santiago del Estero, Argentina
| | - Lorena Valle
- Instituto de Bionanotecnología del NOA (INBIONATEC-CONICET), Universidad Nacional de Santiago del Estero (UNSE), Santiago del Estero, Argentina
- Instituto de Ciencias Químicas (ICQ), Facultad de Agronomía y Agroindustrias (FAyA), UNSE, Santiago del Estero, Argentina
- * E-mail: (MAM); (LV)
| | - Maria A. Mussi
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Universidad Nacional de Rosario (UNR), Rosario, Argentina
- * E-mail: (MAM); (LV)
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5
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Crosio MA, Silber JJ, Moran Vieyra FE, Falcone RD, Borsarelli CD, Correa NM. Deciphering Solvation Effects in Aqueous Binary Mixtures by Fluorescence Behavior of 4-Aminophthalimide: The Comparison Between Ionic Liquids and Alcohols as Cosolvents. J Phys Chem B 2021; 125:13203-13211. [PMID: 34788537 DOI: 10.1021/acs.jpcb.1c06569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ionic liquids (ILs) have received attention for many years due to them being very promising as green solvent substitutes, but they are not fully understood, especially their behavior dissolved in other solvents, for example, water. Thus, the goal of this contribution is to show insight into the different IL-water mixtures interaction. In this way, two protic ILs (PILs), ethylammonium nitrate (EAN) and 1-methylimidazolium acetate (MIA), mixed with water were investigated. To study the PILs-water interaction, the unique spectroscopical behavior in water of the molecular probe 4-aminophthalimide (4-AP) was used. 4-AP emission spectra show hypsochromic shifting by changing the excitation wavelength and, using time-resolved spectroscopy, can be detected by a blue shifting with time. Also, the water mixture of an aprotic IL, 1-methyl-3-butylimidazolium tetrafluoroborate (bmimBF4), and three alcohols, methanol (MeOH), 2-propanol (2-PrOH), and t-butanol (t-BOH), were investigated for comparison. Our results show that the water-ILs interaction is dominated by the size of the IL components, in particular, the cation size. Thus, in MIA-water and bmimBF4-water mixtures, 4-AP is mostly solvated by the IL, even at a low IL molar fraction, as in the t-BOH-water mixture. This finding is especially interesting when ILs-water mixtures are used as a solvent in an organic reaction, where it may call attention to water probably not being the solvent that is interacting with the reactants.
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Affiliation(s)
- Matias A Crosio
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, Av. Haya de la Torre s/N° Ciudad Universitaria C.P., X5000HUA, Córdoba, Argentina.,Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Av. Haya de la Torre s/N° Ciudad Universitaria C.P., X5000HUA, Córdoba, Argentina
| | - Juana J Silber
- Instituto para el Desarrollo Agroindustrial y de la Salud, IDAS, (CONICET - UNRC), Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina.,Departamento de Química, Facultad Ciencias Exactas Fisico-Química y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina
| | - F Eduardo Moran Vieyra
- Instituto de Bionanotecnología del NOA (INBIONATEC), CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, km 1125, G4206XCP, Santiago del Estero, Argentina.,Facultad de Agronomía y Agroindustrias, UNSE, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| | - R Darío Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud, IDAS, (CONICET - UNRC), Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina.,Departamento de Química, Facultad Ciencias Exactas Fisico-Química y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina
| | - Claudio D Borsarelli
- Instituto de Bionanotecnología del NOA (INBIONATEC), CONICET, Universidad Nacional de Santiago del Estero (UNSE), RN9, km 1125, G4206XCP, Santiago del Estero, Argentina.,Facultad de Agronomía y Agroindustrias, UNSE, Av. Belgrano (S) 1912, G4200ABT, Santiago del Estero, Argentina
| | - N Mariano Correa
- Instituto para el Desarrollo Agroindustrial y de la Salud, IDAS, (CONICET - UNRC), Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina.,Departamento de Química, Facultad Ciencias Exactas Fisico-Química y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina
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6
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Erben J, Wang X, Kerzenmacher S. High Current Production of
Shewanella Oneidensis
with Electrospun Carbon Nanofiber Anodes is Directly Linked to Biofilm Formation**. ChemElectroChem 2021. [DOI: 10.1002/celc.202100192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Johannes Erben
- Center for Environmental Research and Sustainable Technology (UFT) University of Bremen 28359 Bremen Germany
| | - Xinyu Wang
- Laboratory for MEMS Applications IMTEK – Department of Microsystems Engineering University of Freiburg Georges-Koehler-Allee 103 79110 Freiburg Germany
| | - Sven Kerzenmacher
- Center for Environmental Research and Sustainable Technology (UFT) University of Bremen 28359 Bremen Germany
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7
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Jaadane I, Villalpando Rodriguez G, Boulenguez P, Carré S, Dassieni I, Lebon C, Chahory S, Behar-Cohen F, Martinsons C, Torriglia A. Retinal phototoxicity and the evaluation of the blue light hazard of a new solid-state lighting technology. Sci Rep 2020; 10:6733. [PMID: 32317708 PMCID: PMC7174369 DOI: 10.1038/s41598-020-63442-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 03/28/2020] [Indexed: 11/08/2022] Open
Abstract
Exposure Limit Values (ELV) for artificial lighting were defined in order to prevent light-induced damage to the retina. The evaluation of the lighting devices include the correction of their spectra by the B(λ) function or blue light hazard function, representing the relative spectral sensitivity of the human eye to the blue light. This weighting function peaks between 435 and 440 nm. In this study we evaluate a new generation of light emitting diode (LED), the GaN-on-GaN (gallium nitride on gallium nitride) LED, that present an emission peak in the purple part of the spectrum. Wistar rats were exposed to GaN-on-GaN and conventional diodes at different retinal doses (from 2.2 to 0.5 J/cm2). We show that GaN-on-GaN diodes are more toxic than conventional LED for the rat neural retina and the rat retinal pigment epithelium, indicating that the BLH (blue light hazard) weighting is not adapted to this type of diodes. One of the reasons of this increased toxicity is the effects of shorter wavelengths on mitochondria polarization. We also show that the threshold of phototoxic retinal dose in the rat (fixed at 11 J/cm2, BLH weighted) is overestimated, suggesting that the values used for regulations, calculated in primates using the same methods than in rats, should be revised.
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Affiliation(s)
- Imene Jaadane
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
- ENVA, Ecole Nationale Vétérinaire d'Alfort, Unité d'ophtalmologie, Maisons-Alfort, France
| | - Gloria Villalpando Rodriguez
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
| | - Pierre Boulenguez
- CSTB, Centre Scientifique et Technique du Bâtiment, Division Eclairage et électromagnétisme, Saint Martin d'Heres, France
| | - Samuel Carré
- CSTB, Centre Scientifique et Technique du Bâtiment, Division Eclairage et électromagnétisme, Saint Martin d'Heres, France
| | - Irene Dassieni
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
| | - Cecile Lebon
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
| | - Sabine Chahory
- ENVA, Ecole Nationale Vétérinaire d'Alfort, Unité d'ophtalmologie, Maisons-Alfort, France
| | - Francine Behar-Cohen
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
| | - Christophe Martinsons
- CSTB, Centre Scientifique et Technique du Bâtiment, Division Eclairage et électromagnétisme, Saint Martin d'Heres, France
| | - Alicia Torriglia
- INSERM U1138, Centre de Recherches des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France.
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8
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Andrikopoulos PC, Liu Y, Picchiotti A, Lenngren N, Kloz M, Chaudhari AS, Precek M, Rebarz M, Andreasson J, Hajdu J, Schneider B, Fuertes G. Femtosecond-to-nanosecond dynamics of flavin mononucleotide monitored by stimulated Raman spectroscopy and simulations. Phys Chem Chem Phys 2020; 22:6538-6552. [PMID: 31994556 DOI: 10.1039/c9cp04918e] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Flavin mononucleotide (FMN) belongs to the large family of flavins, ubiquitous yellow-coloured biological chromophores that contain an isoalloxazine ring system. As a cofactor in flavoproteins, it is found in various enzymes and photosensory receptors, like those featuring the light-oxygen-voltage (LOV) domain. The photocycle of FMN is triggered by blue light and proceeds via a cascade of intermediate states. In this work, we have studied isolated FMN in an aqueous solution in order to elucidate the intrinsic electronic and vibrational changes of the chromophore upon excitation. The ultrafast transitions of excited FMN were monitored through the joint use of femtosecond stimulated Raman spectroscopy (FSRS) and transient absorption spectroscopy encompassing a time window between 0 ps and 6 ns with 50 fs time resolution. Global analysis of the obtained transient visible absorption and transient Raman spectra in combination with extensive quantum chemistry calculations identified unambiguously the singlet and triplet FMN populations and addressed solvent dynamics effects. The good agreement between the experimental and theoretical spectra facilitated the assignment of electronic transitions and vibrations. Our results represent the first steps towards more complex experiments aimed at tracking structural changes of FMN embedded in light-inducible proteins upon photoexcitation.
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Affiliation(s)
- Prokopis C Andrikopoulos
- Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Průmyslová 595, CZ-252 50 Vestec, Czech Republic.
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9
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10
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Suppression of riboflavin-sensitized singlet oxygen generation by l-ascorbic acid, 3-O-ethyl-l-ascorbic acid and Trolox. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 191:116-122. [DOI: 10.1016/j.jphotobiol.2018.12.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 02/06/2023]
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11
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Castaño C, Serrano MP, Lorente C, Borsarelli CD, Thomas AH. Quenching of the Singlet and Triplet Excited States of Pterin by Amino Acids. Photochem Photobiol 2018; 95:220-226. [DOI: 10.1111/php.13046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/25/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Carolina Castaño
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Mariana P. Serrano
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Carolina Lorente
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Claudio D. Borsarelli
- Instituto de Bionanotecnología del NOA (INBIONATEC); CONICET; Universidad Nacional de Santiago del Estero (UNSE); Santiago del Estero Argentina
| | - Andrés H. Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
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12
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Das K, Satpathi S, Hazra P. Effect of Bile Salt Aggregates on the Prototropic Equilibria of Harmine, a Fluorescent β-Carboline Alkaloid. ChemistrySelect 2018. [DOI: 10.1002/slct.201702817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Konoya Das
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Pune 411008), Maharashtra India
| | - Sagar Satpathi
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Pune 411008), Maharashtra India
| | - Partha Hazra
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Pune 411008), Maharashtra India
- Centre for Energy Science; Indian Institute of Science Education and Research (IISER); Pune 411008), Maharashtra India
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13
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Gnapareddy B, Dugasani SR, Son J, Park SH. Topological, chemical and electro-optical characteristics of riboflavin-doped artificial and natural DNA thin films. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171179. [PMID: 29515837 PMCID: PMC5830726 DOI: 10.1098/rsos.171179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 01/15/2018] [Indexed: 06/08/2023]
Abstract
DNA is considered as a useful building bio-material, and it serves as an efficient template to align functionalized nanomaterials. Riboflavin (RF)-doped synthetic double-crossover DNA (DX-DNA) lattices and natural salmon DNA (SDNA) thin films were constructed using substrate-assisted growth and drop-casting methods, respectively, and their topological, chemical and electro-optical characteristics were evaluated. The critical doping concentrations of RF ([RF]C, approx. 5 mM) at given concentrations of DX-DNA and SDNA were obtained by observing the phase transition (from crystalline to amorphous structures) of DX-DNA and precipitation of SDNA in solution above [RF]C. [RF]C are verified by analysing the atomic force microscopy images for DX-DNA and current, absorbance and photoluminescence (PL) for SDNA. We study the physical characteristics of RF-embedded SDNA thin films, using the Fourier transform infrared spectrum to understand the interaction between the RF and DNA molecules, current to evaluate the conductance, absorption to understand the RF binding to the DNA and PL to analyse the energy transfer between the RF and DNA. The current and UV absorption band of SDNA thin films decrease up to [RF]C followed by an increase above [RF]C. By contrast, the PL intensity illustrates the reverse trend, as compared to the current and UV absorption behaviour as a function of the varying [RF]. Owing to the intense PL characteristic of RF, the DNA lattices and thin films with RF might offer immense potential to develop efficient bio-sensors and useful bio-photonic devices.
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Affiliation(s)
| | | | | | - Sung Ha Park
- Department of Physics and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
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14
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Prajapati R, Mukherjee TK. Effect of surfactant assemblies on the resonance energy transfer from 4′,6-diamidino-2-phenylindole to silver nanoclusters. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Abatedaga I, Valle L, Golic AE, Müller GL, Cabruja M, Morán Vieyra FE, Jaime PC, Mussi MA, Borsarelli CD. Integration of Temperature and Blue-Light Sensing in Acinetobacter baumannii
Through the BlsA Sensor. Photochem Photobiol 2017; 93:805-814. [DOI: 10.1111/php.12760] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Accepted: 02/17/2017] [Indexed: 01/10/2023]
Affiliation(s)
- Inés Abatedaga
- Instituto de Bionanotecnología del NOA (INBIONATEC); Universidad Nacional de Santiago del Estero (UNSE); CONICET; Santiago del Estero Argentina
| | - Lorena Valle
- Instituto de Bionanotecnología del NOA (INBIONATEC); Universidad Nacional de Santiago del Estero (UNSE); CONICET; Santiago del Estero Argentina
| | - Adrián E. Golic
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario (UNR); Rosario Argentina
| | - Gabriela L. Müller
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario (UNR); Rosario Argentina
| | - Matías Cabruja
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET); Universidad Nacional de Rosario (UNR); Rosario Argentina
| | - Faustino E. Morán Vieyra
- Instituto de Bionanotecnología del NOA (INBIONATEC); Universidad Nacional de Santiago del Estero (UNSE); CONICET; Santiago del Estero Argentina
| | - Paula C. Jaime
- Instituto de Bionanotecnología del NOA (INBIONATEC); Universidad Nacional de Santiago del Estero (UNSE); CONICET; Santiago del Estero Argentina
| | - María Alejandra Mussi
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET); Universidad Nacional de Rosario (UNR); Rosario Argentina
| | - Claudio D. Borsarelli
- Instituto de Bionanotecnología del NOA (INBIONATEC); Universidad Nacional de Santiago del Estero (UNSE); CONICET; Santiago del Estero Argentina
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16
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17
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Westberg M, Bregnhøj M, Etzerodt M, Ogilby PR. Temperature Sensitive Singlet Oxygen Photosensitization by LOV-Derived Fluorescent Flavoproteins. J Phys Chem B 2017; 121:2561-2574. [PMID: 28257211 DOI: 10.1021/acs.jpcb.7b00561] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Optogenetic sensitizers that selectively produce a given reactive oxygen species (ROS) constitute a promising tool for studying cell signaling processes with high levels of spatiotemporal control. However, to harness the full potential of this tool for live cell studies, the photophysics of currently available systems need to be explored further and optimized. Of particular interest in this regard, are the flavoproteins miniSOG and SOPP, both of which (1) contain the chromophore flavin mononucleotide, FMN, in a LOV-derived protein enclosure, and (2) photosensitize the production of singlet oxygen, O2(a1Δg). Here we present an extensive experimental study of the singlet and triplet state photophysics of FMN in SOPP and miniSOG over a physiologically relevant temperature range. Although changes in temperature only affect the singlet excited state photophysics slightly, the processes that influence the deactivation of the triplet excited state are more sensitive to temperature. Most notably, for both proteins, the rate constant for quenching of 3FMN by ground state oxygen, O2(X3Σg-), increases ∼10-fold upon increasing the temperature from 10 to 43 °C, while the oxygen-independent channels of triplet state deactivation are less affected. As a consequence, this increase in temperature results in higher yields of O2(a1Δg) formation for both SOPP and miniSOG. We also show that the quantum yields of O2(a1Δg) production by both miniSOG and SOPP are mainly limited by the fraction of FMN triplet states quenched by O2(X3Σg-). The results presented herein provide a much-needed quantitative framework that will facilitate the future development of optogenetic ROS sensitizers.
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Affiliation(s)
- Michael Westberg
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Michael Etzerodt
- Department of Molecular Biology and Genetics, Aarhus University , DK-8000 Aarhus, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
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18
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Rajendran M, Dane E, Conley J, Tantama M. Imaging Adenosine Triphosphate (ATP). THE BIOLOGICAL BULLETIN 2016; 231:73-84. [PMID: 27638696 PMCID: PMC5063237 DOI: 10.1086/689592] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Adenosine triphosphate (ATP) is a universal mediator of metabolism and signaling across unicellular and multicellular species. There is a fundamental interdependence between the dynamics of ATP and the physiology that occurs inside and outside the cell. Characterizing and understanding ATP dynamics provide valuable mechanistic insight into processes that range from neurotransmission to the chemotaxis of immune cells. Therefore, we require the methodology to interrogate both temporal and spatial components of ATP dynamics from the subcellular to the organismal levels in live specimens. Over the last several decades, a number of molecular probes that are specific to ATP have been developed. These probes have been combined with imaging approaches, particularly optical microscopy, to enable qualitative and quantitative detection of this critical molecule. In this review, we survey current examples of technologies available for visualizing ATP in living cells, and identify areas where new tools and approaches are needed to expand our capabilities.
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Affiliation(s)
- Megha Rajendran
- Department of Chemistry, Purdue University, 560 Oval Drive, Box 68, West Lafayette, Indiana 47907; and
| | - Eric Dane
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 76-211, Cambridge, Massachusetts 02139
| | - Jason Conley
- Department of Chemistry, Purdue University, 560 Oval Drive, Box 68, West Lafayette, Indiana 47907; and
| | - Mathew Tantama
- Department of Chemistry, Purdue University, 560 Oval Drive, Box 68, West Lafayette, Indiana 47907; and
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19
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Valle L, Morán Vieyra FE, Borsarelli CD. Nanoenvironmental effect in AOT reverse micelles on the triplet excited state properties of flavins and quenching by molecular oxygen. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3575] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Lorena Valle
- Instituto de Bionanotecnología, INBIONATEC-CONICET; Universidad Nacional de Santiago del Estero (UNSE); RN9, Km 1125 G4206XCP Santiago del Estero Argentina
| | - Faustino E. Morán Vieyra
- Instituto de Bionanotecnología, INBIONATEC-CONICET; Universidad Nacional de Santiago del Estero (UNSE); RN9, Km 1125 G4206XCP Santiago del Estero Argentina
| | - Claudio D. Borsarelli
- Instituto de Bionanotecnología, INBIONATEC-CONICET; Universidad Nacional de Santiago del Estero (UNSE); RN9, Km 1125 G4206XCP Santiago del Estero Argentina
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20
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In Situ Analysis of a Silver Nanoparticle-Precipitating Shewanella Biofilm by Surface Enhanced Confocal Raman Microscopy. PLoS One 2015; 10:e0145871. [PMID: 26709923 PMCID: PMC4692441 DOI: 10.1371/journal.pone.0145871] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 12/09/2015] [Indexed: 11/19/2022] Open
Abstract
Shewanella oneidensis MR-1 is an electroactive bacterium, capable of reducing extracellular insoluble electron acceptors, making it important for both nutrient cycling in nature and microbial electrochemical technologies, such as microbial fuel cells and microbial electrosynthesis. When allowed to anaerobically colonize an Ag/AgCl solid interface, S. oneidensis has precipitated silver nanoparticles (AgNp), thus providing the means for a surface enhanced confocal Raman microscopy (SECRaM) investigation of its biofilm. The result is the in-situ chemical mapping of the biofilm as it developed over time, where the distribution of cytochromes, reduced and oxidized flavins, polysaccharides and phosphate in the undisturbed biofilm is monitored. Utilizing AgNp bio-produced by the bacteria colonizing the Ag/AgCl interface, we could perform SECRaM while avoiding the use of a patterned or roughened support or the introduction of noble metal salts and reducing agents. This new method will allow a spatially and temporally resolved chemical investigation not only of Shewanella biofilms at an insoluble electron acceptor, but also of other noble metal nanoparticle-precipitating bacteria in laboratory cultures or in complex microbial communities in their natural habitats.
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21
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Serrano MP, Lorente C, Borsarelli CD, Thomas AH. Unraveling the Degradation Mechanism of Purine Nucleotides Photosensitized by Pterins: The Role of Charge-Transfer Steps. Chemphyschem 2015; 16:2244-52. [PMID: 26017933 DOI: 10.1002/cphc.201500219] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Indexed: 11/09/2022]
Abstract
Photosensitized reactions contribute to the development of skin cancer and are used in many applications. Photosensitizers can act through different mechanisms. It is currently accepted that if the photosensitizer generates singlet molecular oxygen ((1) O2 ) upon irradiation, the target molecule can undergo oxidation by this reactive oxygen species and the reaction needs dissolved O2 to proceed, therefore the reaction is classified as (1) O2 -mediated oxidation (type II mechanism). However, this assumption is not always correct, and as an example, a study on the degradation of 2'-deoxyguanosine 5'-monophosphate photosensitized by pterin is presented. A general mechanism is proposed to explain how the degradation of biological targets, such as nucleotides, photosensitized by pterins, naturally occurring (1) O2 photosensitizers, takes place through an electron-transfer-initiated process (type I mechanism), whereas the contribution of the (1) O2 -mediated oxidation is almost negligible.
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Affiliation(s)
- Mariana P Serrano
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, (1900) La Plata (Argentina)
| | - Carolina Lorente
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, (1900) La Plata (Argentina)
| | - Claudio D Borsarelli
- Laboratorio de Cinética y Fotoquímica (LACIFO), Centro de Investigaciones y Transferencia de Santiago del Estero (CITSE-CONICET) Universidad Nacional de Santiago del Estero (UNSE), Casilla de Correo 23, Bs. As. 252, G4200AQF, Santiago del Estero (Argentina)
| | - Andrés H Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, (1900) La Plata (Argentina).
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22
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Albarracín VH, Simon J, Pathak GP, Valle L, Douki T, Cadet J, Borsarelli CD, Farias ME, Gärtner W. First characterisation of a CPD-class I photolyase from a UV-resistant extremophile isolated from High-Altitude Andean Lakes. Photochem Photobiol Sci 2015; 13:739-50. [PMID: 24637630 DOI: 10.1039/c3pp50399b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UV-resistant Acinetobacter sp. Ver3 isolated from High-Altitude Andean Lakes (HAAL) in Argentinean Puna, one of the highest UV exposed ecosystems on Earth, showed efficient DNA photorepairing ability, coupled to highly efficient antioxidant enzyme activities in response to UV-B stress. We herein present the cloning, expression, and functional characterization of a cyclobutane pyrimidine dimer (CPD)-class I photolyase (Ver3Phr) from this extremophile to prove its involvement in the previously noted survival capability. Spectroscopy of the overexpressed and purified protein identified flavin adenine dinucleotide (FAD) and 5,10-methenyltetrahydrofolate (MTHF) as chromophore and antenna molecules, respectively. All functional analyses were performed in parallel with the ortholog E. coli photolyase. Whereas the E. coli enzyme showed the FAD chromophore as a mixture of oxidised and reduced states, the Ver3 chromophore always remained partly (including the semiquinone state) or fully reduced under all experimental conditions tested. Functional complementation of Ver3Phr in Phr(-)-RecA E. coli strains was assessed by traditional UFC counting and measurement of DNA bipyrimidine photoproducts by HPLC coupled with electrospray ionisation-tandem mass spectrometry (ESI-MS/MS) detection. The results identified strong photoreactivation ability in vivo of Ver3Phr while its nonphotoreactivation function, probably related with the stimulation of nucleotide excision repair (NER), was not as manifest as for EcPhr. Whether this is a question of the approach using an exogenous photolyase incorporated in a non-genuine host or a fundamental different behaviour of a novel enzyme from an exotic environment will need further studies.
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Affiliation(s)
- Virginia Helena Albarracín
- Planta Piloto de Procesos Industriales y Microbiológicos (PROIMI), CCT, CONICET, Av. Belgrano y Pasaje Caseros, 4000- S. M. de Tucumán, Argentina
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23
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Khrenova MG, Nemukhin AV, Domratcheva T. Theoretical Characterization of the Flavin-Based Fluorescent Protein iLOV and its Q489K Mutant. J Phys Chem B 2015; 119:5176-83. [DOI: 10.1021/acs.jpcb.5b01299] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maria G. Khrenova
- Chemistry
Department, M.V. Lomonosov Moscow State University, Leninskie
Gory 1/3, Moscow, 119991, Russian Federation
| | - Alexander V. Nemukhin
- Chemistry
Department, M.V. Lomonosov Moscow State University, Leninskie
Gory 1/3, Moscow, 119991, Russian Federation
- N.M.
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow, 119334, Russian Federation
| | - Tatiana Domratcheva
- Department
of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
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24
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Valle L, Abatedaga I, Vieyra FEM, Bortolotti A, Cortez N, Borsarelli CD. Enhancement of photophysical and photosensitizing properties of flavin adenine dinucleotide by mutagenesis of the C-terminal extension of a bacterial flavodoxin reductase. Chemphyschem 2015; 16:872-83. [PMID: 25641205 DOI: 10.1002/cphc.201402774] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Indexed: 12/26/2022]
Abstract
The role of the mobile C-terminal extension present in Rhodobacter capsulatus ferredoxin-NADP(H) reductase (RcFPR) was evaluated using steady-state and dynamic spectroscopies for both intrinsic Trp and FAD in a series of mutants in the absence of NADP(H). Deletion of the six C-terminal amino acids beyond Ala266 was combined with the replacement A266Y to emulate the structure of plastidic reductases. Our results show that these modifications of the wild-type RcFPR produce subtle global conformational changes, but strongly reduce the local rigidity of the FAD-binding pocket, exposing the isoalloxazine ring to the solvent. Thus, the ultrafast charge-transfer quenching of (1) FAD* by the conserved Tyr66 residue was absent in the mutant series, producing enhancement of the excited singlet- and triplet-state properties of FAD. This work highlights the delicate balance of the specific interactions between FAD and the surrounding amino acids, and how the functionality and/or photostability of redox flavoproteins can be modified.
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Affiliation(s)
- Lorena Valle
- Centro de Investigaciones y Transferencia de Santiago del Estero (CITSE-CONICET), Universidad Nacional de Santiago del Estero, RN9 Km 1125. 4206, Santiago del Estero (Argentina)
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25
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Westberg M, Holmegaard L, Pimenta FM, Etzerodt M, Ogilby PR. Rational design of an efficient, genetically encodable, protein-encased singlet oxygen photosensitizer. J Am Chem Soc 2015; 137:1632-42. [PMID: 25575190 DOI: 10.1021/ja511940j] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Singlet oxygen, O(2)(a(1)Δ(g)), plays a key role in many processes of cell signaling. Limitations in mechanistic studies of such processes are generally associated with the difficulty of controlling the amount and location of O(2)(a(1)Δ(g)) production in or on a cell. As such, there is great need for a system that (a) selectively produces O(2)(a(1)Δ(g)) in appreciable and accurately quantifiable yields and (b) can be localized in a specific place at the suborganelle level. A genetically encodable, protein-encased photosensitizer is one way to achieve this goal. Through a systematic and rational approach involving mutations to a LOV2 protein that binds the chromophore flavin mononucleotide (FMN), we have developed a promising photosensitizer that overcomes many of the problems that affect related systems currently in use. Specifically, by decreasing the extent of hydrogen bonding between FMN and a specific amino acid residue in the local protein environment, we decrease the susceptibility of FMN to undesired photoinitiated electron-transfer reactions that kinetically compete with O(2)(a(1)Δ(g)) production. As a consequence, our protein-encased FMN system produces O(2)(a(1)Δ(g)) with the uniquely large quantum efficiency of 0.25 ± 0.03. We have also quantified other key photophysical parameters that characterize this sensitizer system, including unprecedented H(2)O/D(2)O solvent isotope effects on the O(2)(a(1)Δ(g)) formation kinetics and yields. As such, our results facilitate future systematic developments in this field.
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Affiliation(s)
- Michael Westberg
- Center for Oxygen Microscopy and Imaging, Chemistry Department and ‡Department of Molecular Biology and Genetics, Aarhus University , DK-8000, Aarhus, Denmark
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26
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Chen JS, Zhao FJ, Yang Y, Chu TS. Hydrogen bond effect on the photophysical properties of 2-ureido-4[1H]-pyrimidinone quadruple hydrogen bonded systems. RSC Adv 2015. [DOI: 10.1039/c5ra04005a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two different hydrogen bond effects on the photophysical properties of UPy systems in different solutions have been studied.
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Affiliation(s)
- Jun-Sheng Chen
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- People's Republic of China
| | - Feng-Jiao Zhao
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- People's Republic of China
| | - Yang Yang
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- People's Republic of China
| | - Tian-Shu Chu
- State Key Laboratory of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- People's Republic of China
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27
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Ghosh S, Banik D, Roy A, Kundu N, Kuchlyan J, Sarkar N. Spectroscopic investigation of the binding interactions of a membrane potential molecule in various supramolecular confined environments: contrasting behavior of surfactant molecules in relocation or release of the probe between nanocarriers and DNA surface. Phys Chem Chem Phys 2014; 16:25024-38. [DOI: 10.1039/c4cp03178d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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FAD binding properties of a cytosolic version of Escherichia coli NADH dehydrogenase-2. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:576-84. [PMID: 24418395 DOI: 10.1016/j.bbapap.2013.12.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 12/27/2013] [Accepted: 12/31/2013] [Indexed: 12/18/2022]
Abstract
Respiratory NADH dehydrogenase-2 (NDH-2) of Escherichia coli is a peripheral membrane-bound flavoprotein. By eliminating its C-terminal region, a water soluble truncated version was obtained in our laboratory. Overall conformation of the mutant version resembles the wild-type protein. Considering these data and the fact that the mutant was obtained as an apo-protein, the truncated version is an ideal model to study the interaction between the enzyme and its cofactor. Here, the FAD binding properties of this version were characterized using far-UV circular dichroism (CD), differential scanning calorimetry (DSC), limited proteolysis, and steady-state and dynamic fluorescence spectroscopy. CD spectra, thermal unfolding and DSC profiles did not reveal any major difference in secondary structure between apo- and holo-protein. In addition, digestion site accessibility and tertiary conformation were similar for both proteins, as seen by comparable chymotryptic cleavage patterns. FAD binding to the apo-protein produced a parallel increment of both FAD fluorescence quantum yield and steady-state emission anisotropy. On the other hand, addition of FAD quenched the intrinsic fluorescence emission of the truncated protein, indicating that the flavin cofactor should be closely located to the protein Trp residues. Analysis of the steady-state and dynamic fluorescence data confirms the formation of the holo-protein with a 1:1 binding stoichiometry and an association constant KA=7.0(±0.8)×10(4)M(-1). Taken together, the FAD-protein interaction is energetically favorable and the addition of FAD is not necessary to induce the enzyme folded state. For the first time, a detailed characterization of the flavin:protein interaction was performed among alternative NADH dehydrogenases.
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29
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Mora AK, Murudkar S, Singh PK, Gowthaman N, Mukherjee T, Nath S. Ultrafast excited state dynamics of 1-nitropyrene: Effect of H-bonding. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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30
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Folding dynamics of flavin adenine dinucleotide (FAD) inside non-aqueous and aqueous reverse micelles. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.08.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Pimenta FM, Jensen RL, Breitenbach T, Etzerodt M, Ogilby PR. Oxygen-dependent photochemistry and photophysics of "miniSOG," a protein-encased flavin. Photochem Photobiol 2013; 89:1116-26. [PMID: 23869989 DOI: 10.1111/php.12111] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 06/09/2013] [Indexed: 01/03/2023]
Abstract
Selected photochemical and photophysical parameters of flavin mononucleotide (FMN) have been examined under conditions in which FMN is (1) solvated in a buffered aqueous solution, and (2) encased in a protein likewise solvated in a buffered aqueous solution. The latter was achieved using the so-called "mini Singlet Oxygen Generator" (miniSOG), an FMN-containing flavoprotein engineered from Arabidopsis thaliana phototropin 2. Although FMN is a reasonably good singlet oxygen photosensitizer in bulk water (ϕΔ = 0.65 ± 0.04), enclosing FMN in this protein facilitates photoinitiated electron-transfer reactions (Type-I chemistry) at the expense of photosensitized singlet oxygen production (Type-II chemistry) and results in a comparatively poor yield of singlet oxygen (ϕΔ = 0.030 ± 0.002). This observation on the effect of the local environment surrounding FMN is supported by a host of spectroscopic and chemical trapping experiments. The results of this study not only elucidate the behavior of miniSOG but also provide useful information for the further development of well-characterized chromophores suitable for use as intracellular sensitizers in mechanistic studies of reactive oxygen species.
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Affiliation(s)
- Frederico M Pimenta
- Department of Chemistry, Center for Oxygen Microscopy and Imaging, Aarhus University, Aarhus, Denmark
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32
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Ruiz-González R, Cortajarena AL, Mejias SH, Agut M, Nonell S, Flors C. Singlet oxygen generation by the genetically encoded tag miniSOG. J Am Chem Soc 2013; 135:9564-7. [PMID: 23781844 DOI: 10.1021/ja4020524] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The genetically encodable fluorescent tag miniSOG is expected to revolutionize correlative light- and electron microscopy due to its ability to produce singlet oxygen upon light irradiation. The quantum yield of this process was reported as ΦΔ = 0.47 ± 0.05, as derived from miniSOG's ability to photooxidize the fluorescent probe anthracene dipropionic acid (ADPA). In this report, a significantly smaller value of ΦΔ = 0.03 ± 0.01 is obtained by two methods: direct measurement of its phosphorescence at 1275 nm and chemical trapping using uric acid as an alternative probe. We present insight into the photochemistry of miniSOG and ascertain the reasons for the discrepancy in ΦΔ values. We find that miniSOG oxidizes ADPA by both singlet oxygen-dependent and -independent processes. We also find that cumulative irradiation of miniSOG increases its ΦΔ value ~10-fold due to a photoinduced transformation of the protein. This may be the reason why miniSOG outperforms other fluorescent proteins reported to date as singlet oxygen generators.
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Affiliation(s)
- Rubén Ruiz-González
- Institut Quimic de Sarrià, Universitat Ramon Llull, Via Augusta 390, E-08017, Barcelona, Spain
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33
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Maity B, Chatterjee A, Seth D. Effect of nano-confinement on the photophysics of lumichrome. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.02.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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Serrano MP, Lorente C, Vieyra FEM, Borsarelli CD, Thomas AH. Photosensitizing properties of biopterin and its photoproducts using 2'-deoxyguanosine 5'-monophosphate as an oxidizable target. Phys Chem Chem Phys 2012; 14:11657-65. [PMID: 22825359 DOI: 10.1039/c2cp41476g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UV-A radiation (320-400 nm) induces damage to the DNA molecule and its components through photosensitized reactions. Biopterin (Bip) and its photoproducts 6-formylpterin (Fop) and 6-carboxypterin (Cap) accumulate in the skin of human beings suffering from vitiligo, a depigmentation disorder where the protection against UV radiation fails because of the lack of melanin. This study was aimed to evaluate the photosensitizing properties of oxidized pterins present in the skin and to elucidate the mechanisms involved in the photosensitized oxidation of purine nucleotides by pterins in vitro. For this purpose, steady-state and time-resolved experiments in acidic (pH 5.0-5.8) aqueous solution were performed using Bip, Fop and Cap as photosensitizers and the nucleotide 2'-deoxyguanosine 5'-monophosphate (dGMP) as an oxidizable target. The three pterin derivatives are able to photosensitize dGMP, being Fop the most efficient sensitizer. The reactions proceed through two competing pathways: (1) electron transfer from dGMP to triplet excited-state of pterins (type I mechanism) and (2) reaction of dGMP with (1)O(2) produced by pterins (type II mechanism). Kinetic analysis revealed that the electron transfer pathway is the main mechanism and the interaction of dGMP with the triplet excited-state of pterins and the formation of the corresponding dGMP radicals were demonstrated by laser flash photolysis experiments. The biological implications of the results obtained are also discussed.
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Affiliation(s)
- Mariana P Serrano
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, La Plata, Argentina
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