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Bregnhøj M, Thorning F, Ogilby PR. Singlet Oxygen Photophysics: From Liquid Solvents to Mammalian Cells. Chem Rev 2024; 124:9949-10051. [PMID: 39106038 DOI: 10.1021/acs.chemrev.4c00105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
Molecular oxygen, O2, has long provided a cornerstone for studies in chemistry, physics, and biology. Although the triplet ground state, O2(X3Σg-), has garnered much attention, the lowest excited electronic state, O2(a1Δg), commonly called singlet oxygen, has attracted appreciable interest, principally because of its unique chemical reactivity in systems ranging from the Earth's atmosphere to biological cells. Because O2(a1Δg) can be produced and deactivated in processes that involve light, the photophysics of O2(a1Δg) are equally important. Moreover, pathways for O2(a1Δg) deactivation that regenerate O2(X3Σg-), which address fundamental principles unto themselves, kinetically compete with the chemical reactions of O2(a1Δg) and, thus, have practical significance. Due to technological advances (e.g., lasers, optical detectors, microscopes), data acquired in the past ∼20 years have increased our understanding of O2(a1Δg) photophysics appreciably and facilitated both spatial and temporal control over the behavior of O2(a1Δg). One goal of this Review is to summarize recent developments that have broad ramifications, focusing on systems in which oxygen forms a contact complex with an organic molecule M (e.g., a liquid solvent). An important concept is the role played by the M+•O2-• charge-transfer state in both the formation and deactivation of O2(a1Δg).
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Affiliation(s)
- Mikkel Bregnhøj
- Department of Chemistry, Aarhus University, 140 Langelandsgade, Aarhus 8000, Denmark
| | - Frederik Thorning
- Department of Chemistry, Aarhus University, 140 Langelandsgade, Aarhus 8000, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University, 140 Langelandsgade, Aarhus 8000, Denmark
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2
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Mussini A, Delcanale P, Berni M, Pongolini S, Jordà-Redondo M, Agut M, Steinbach PJ, Nonell S, Abbruzzetti S, Viappiani C. Concanavalin A Delivers a Photoactive Protein to the Bacterial Wall. Int J Mol Sci 2024; 25:5751. [PMID: 38891937 PMCID: PMC11172101 DOI: 10.3390/ijms25115751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/13/2024] [Accepted: 05/22/2024] [Indexed: 06/21/2024] Open
Abstract
Modular supramolecular complexes, where different proteins are assembled to gather targeting capability and photofunctional properties within the same structures, are of special interest for bacterial photodynamic inactivation, given their inherent biocompatibility and flexibility. We have recently proposed one such structure, exploiting the tetrameric bacterial protein streptavidin as the main building block, to target S. aureus protein A. To expand the palette of targets, we have linked biotinylated Concanavalin A, a sugar-binding protein, to a methylene blue-labelled streptavidin. By applying a combination of spectroscopy and microscopy, we demonstrate the binding of Concanavalin A to the walls of Gram-positive S. aureus and Gram-negative E. coli. Photoinactivation is observed for both bacterial strains in the low micromolar range, although the moderate affinity for the molecular targets and the low singlet oxygen yields limit the overall efficiency. Finally, we apply a maximum entropy method to the analysis of autocorrelation traces, which proves particularly useful when interpreting signals measured for diffusing systems heterogeneous in size, such as fluorescent species bound to bacteria.
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Affiliation(s)
- Andrea Mussini
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, 43124 Parma, Italy
- Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Pietro Delcanale
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, 43124 Parma, Italy
| | - Melissa Berni
- Risk Analysis and Genomic Epidemiology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna, Strada dei Mercati, 13/A, 43126 Parma, Italy
| | - Stefano Pongolini
- Risk Analysis and Genomic Epidemiology Unit, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna, Strada dei Mercati, 13/A, 43126 Parma, Italy
| | - Mireia Jordà-Redondo
- Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Montserrat Agut
- Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Peter J. Steinbach
- Bioinformatics and Computational Biosciences Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - Stefania Abbruzzetti
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, 43124 Parma, Italy
| | - Cristiano Viappiani
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, 43124 Parma, Italy
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3
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Amado D, Chaves OA, Cruz PF, Loureiro RJS, Almeida ZL, Jesus CSH, Serpa C, Brito RMM. Folding Kinetics and Volume Variation of the β-Hairpin Peptide Chignolin upon Ultrafast pH-Jumps. J Phys Chem B 2024; 128:4898-4910. [PMID: 38733339 DOI: 10.1021/acs.jpcb.3c08271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2024]
Abstract
In-depth characterization of fundamental folding steps of small model peptides is crucial for a better understanding of the folding mechanisms of more complex biomacromolecules. We have previously reported on the folding/unfolding kinetics of a model α-helix. Here, we study folding transitions in chignolin (GYDPETGTWG), a short β-hairpin peptide previously used as a model to study conformational changes in β-sheet proteins. Although previously suggested, until now, the role of the Tyr2-Trp9 interaction in the folding mechanism of chignolin was not clear. In the present work, pH-dependent conformational changes of chignolin were characterized by circular dichroism (CD), nuclear magnetic resonance (NMR), ultrafast pH-jump coupled with time-resolved photoacoustic calorimetry (TR-PAC), and molecular dynamics (MD) simulations. Taken together, our results present a comprehensive view of chignolin's folding kinetics upon local pH changes and the role of the Tyr2-Trp9 interaction in the folding process. CD data show that chignolin's β-hairpin formation displays a pH-dependent skew bell-shaped curve, with a maximum close to pH 6, and a large decrease in β-sheet content at alkaline pH. The β-hairpin structure is mainly stabilized by aromatic interactions between Tyr2 and Trp9 and CH-π interactions between Tyr2 and Pro4. Unfolding of chignolin at high pH demonstrates that protonation of Tyr2 is essential for the stability of the β-hairpin. Refolding studies were triggered by laser-induced pH-jumps and detected by TR-PAC. The refolding of chignolin from high pH, mainly due to the protonation of Tyr2, is characterized by a volume expansion (10.4 mL mol-1), independent of peptide concentration, in the microsecond time range (lifetime of 1.15 μs). At high pH, the presence of the deprotonated hydroxyl (tyrosinate) hinders the formation of the aromatic interaction between Tyr2 and Trp9 resulting in a more disorganized and dynamic tridimensional structure of the peptide. This was also confirmed by comparing MD simulations of chignolin under conditions mimicking neutral and high pH.
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Affiliation(s)
- Daniela Amado
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Otávio A Chaves
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Pedro F Cruz
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Rui J S Loureiro
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Zaida L Almeida
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Catarina S H Jesus
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Carlos Serpa
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Rui M M Brito
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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Mussini A, Uriati E, Hally C, Nonell S, Bianchini P, Diaspro A, Pongolini S, Delcanale P, Abbruzzetti S, Viappiani C. Versatile Supramolecular Complex for Targeted Antimicrobial Photodynamic Inactivation. Bioconjug Chem 2022; 33:666-676. [PMID: 35266706 PMCID: PMC9026257 DOI: 10.1021/acs.bioconjchem.2c00067] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the development of a supramolecular structure endowed with photosensitizing properties and targeting capability for antimicrobial photodynamic inactivation. Our synthetic strategy uses the tetrameric bacterial protein streptavidin, labeled with the photosensitizer eosin, as the main building block. Biotinylated immunoglobulin G (IgG) from human serum, known to associate with Staphylococcus aureus protein A, was bound to the complex streptavidin-eosin. Fluorescence correlation spectroscopy and fluorescence microscopy demonstrate binding of the complex to S. aureus. Efficient photoinactivation is observed for S. aureus suspensions treated with IgG-streptavidin-eosin at concentrations higher than 0.5 μM and exposed to green light. The proposed strategy offers a flexible platform for targeting a variety of molecules and microbial species.
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Affiliation(s)
- Andrea Mussini
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy
| | - Eleonora Uriati
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy.,Nanoscopy@Istituto Italiano di Tecnologia, Via Enrico Melen 83B, Genova 16152, Italy
| | - Cormac Hally
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy.,Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, Barcelona 08017, Spain
| | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, Barcelona 08017, Spain
| | - Paolo Bianchini
- Nanoscopy@Istituto Italiano di Tecnologia, Via Enrico Melen 83B, Genova 16152, Italy
| | - Alberto Diaspro
- Nanoscopy@Istituto Italiano di Tecnologia, Via Enrico Melen 83B, Genova 16152, Italy.,DIFILAB, Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova 16146, Italy
| | - Stefano Pongolini
- Risk Analysis and Genomic Epidemiology, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia-Romagna, Strada dei Mercati, 13/A, Parma 43126, Italy
| | - Pietro Delcanale
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy
| | - Stefania Abbruzzetti
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy
| | - Cristiano Viappiani
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7A, Parma 43124, Italy
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5
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Jesus CSH, Cruz PF, Arnaut LG, Brito RMM, Serpa C. One Peptide Reveals the Two Faces of α-Helix Unfolding-Folding Dynamics. J Phys Chem B 2018; 122:3790-3800. [PMID: 29558133 DOI: 10.1021/acs.jpcb.8b00229] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The understanding of fast folding dynamics of single α-helices comes mostly from studies on rationally designed peptides displaying sequences with high helical propensity. The folding/unfolding dynamics and energetics of α-helix conformations in naturally occurring peptides remains largely unexplored. Here we report the study of a protein fragment analogue of the C-peptide from bovine pancreatic ribonuclease-A, RN80, a 13-amino acid residue peptide that adopts a highly populated helical conformation in aqueous solution. 1H NMR and CD structural studies of RN80 showed that α-helix formation displays a pH-dependent bell-shaped curve, with a maximum near pH 5, and a large decrease in helical content in alkaline pH. The main forces stabilizing this short α-helix were identified as a salt bridge formed between Glu-2 and Arg-10 and the cation-π interaction involving Tyr-8 and His-12. Thus, deprotonation of Glu-2 or protonation of His-12 are essential for the RN80 α-helix stability. In the present study, RN80 folding and unfolding were triggered by laser-induced pH jumps and detected by time-resolved photoacoustic calorimetry (PAC). The photoacid proton release, amino acid residue protonation, and unfolding/folding events occur at different time scales and were clearly distinguished using time-resolved PAC. The partial unfolding of the RN80 α-helix, due to protonation of Glu-2 and consequent breaking of the stabilizing salt bridge between Glu-2 and Arg-10, is characterized by a concentration-independent volume expansion in the sub-microsecond time range (0.8 mL mol-1, 369 ns). This small volume expansion reports the cost of peptide backbone rehydration upon disruption of a solvent-exposed salt bridge, as well as backbone intrinsic expansion. On the other hand, RN80 α-helix folding triggered by His-12 protonation and subsequent formation of a cation-π interaction leads to a microsecond volume contraction (-6.0 mL mol-1, ∼1.7 μs). The essential role of two discrete side chain interactions, a salt bridge, and in particular a single cation-π interaction in the folding dynamics of a naturally occurring α-helix peptide is uniquely revealed by these data.
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Affiliation(s)
- Catarina S H Jesus
- CQC, Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Pedro F Cruz
- CQC, Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Luis G Arnaut
- CQC, Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Rui M M Brito
- CQC, Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Carlos Serpa
- CQC, Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
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6
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Recent advances of folded tetraphenylethene derivatives featuring through-space conjugation. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.06.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Aydinoglu S, Biver T, Figuccia S, Fiore T, Montanaro S, Pellerito C. Studies on DNA interaction of organotin(IV) complexes of meso-tetra(4-sulfonatophenyl)porphine that show cellular activity. J Inorg Biochem 2016; 163:311-317. [PMID: 27393277 DOI: 10.1016/j.jinorgbio.2016.06.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 06/21/2016] [Accepted: 06/28/2016] [Indexed: 12/29/2022]
Abstract
The interaction of the diorgano- and triorganotin(IV) derivatives of meso-tetra-(4-sulfonatophenyl)porphine (Me2Sn)2TPPS, (Bu2Sn)2TPPS, (Me3Sn)4TPPS and (Bu3Sn)4TPPS to natural DNA was analysed (together with free meso-tetra-(4-sulfonatophenyl)porphine (TPPS4-) for comparison purposes). Particular attention was paid to (Bu3Sn)4TPPS, a species that shows significant cellular action. Preliminary tests were done on the solution properties of the organotin(IV) compounds (pKA and possible self-aggregation). Spectrophotometric and spectrofluorometric experiments showed that all the investigated organotin(IV) derivatives strongly interact with DNA, the binding energy depending on the dye steric hindrance. In all cases experimental data concur in indicating that external binding mode prevails. Interestingly, fluorescence quenching and viscosity experiments show that the Bu-containing species, and in particular (Bu3Sn)4TPPS, are able to noticeably alter the DNA conformation.
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Affiliation(s)
- Sabriye Aydinoglu
- Department of Analytical Chemistry, Faculty of Pharmacy, Cukurova University, 01330 Adana, Turkey
| | - Tarita Biver
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124, Pisa, Italy.
| | - Stefania Figuccia
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124, Pisa, Italy
| | - Tiziana Fiore
- Dipartimento di Fisica e Chimica (DiFC), Università di Palermo, Viale delle Scienze, Ed. 17, 90128 Palermo, Italy
| | - Sonia Montanaro
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56124, Pisa, Italy
| | - Claudia Pellerito
- Dipartimento di Fisica e Chimica (DiFC), Università di Palermo, Viale delle Scienze, Ed. 17, 90128 Palermo, Italy
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8
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Brown JE, Diaz L, Christoff-Tempesta T, Nesbitt KM, Reed-Betts J, Sanchez J, Davies KW. Characterization of Nitrazine Yellow as a Photoacoustically Active pH Reporter Molecule. Anal Chem 2015; 87:3623-30. [DOI: 10.1021/ac503515k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jordan E. Brown
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - Lilibet Diaz
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - Ty Christoff-Tempesta
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - Kathryn M. Nesbitt
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - Julia Reed-Betts
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - John Sanchez
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
| | - Kevin W. Davies
- Department of Chemistry and
Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965-6565, United States
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9
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Scholz M, Biehl AL, Dědic R, Hála J. The singlet-oxygen-sensitized delayed fluorescence in mammalian cells: a time-resolved microscopy approach. Photochem Photobiol Sci 2015; 14:700-13. [DOI: 10.1039/c4pp00339j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Microsecond kinetics of singlet-oxygen-sensitized delayed fluorescence (SOSDF) have been detected from individual living fibroblast cells as a proof-of-concept. These provide valuable information about excited state lifetimes and their changes during PDT-like treatment.
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Affiliation(s)
- Marek Scholz
- Charles University in Prague
- Faculty of Mathematics and Physics
- Department of Chemical Physics and Optics
- The Czech Republic
| | - Anna-Louisa Biehl
- Charles University in Prague
- Faculty of Mathematics and Physics
- Department of Chemical Physics and Optics
- The Czech Republic
- On leave from Ernst-Abbe-Fachhochschule Jena
| | - Roman Dědic
- Charles University in Prague
- Faculty of Mathematics and Physics
- Department of Chemical Physics and Optics
- The Czech Republic
| | - Jan Hála
- Charles University in Prague
- Faculty of Mathematics and Physics
- Department of Chemical Physics and Optics
- The Czech Republic
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10
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Carcelli M, Pelagatti P, Viappiani C. Determination of the pKaof the Aci-Nitro Intermediate ino-Nitrobenzyl Systems. Isr J Chem 2013. [DOI: 10.1002/ijch.199800023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Ghasemi JB, Miladi M. Association Equilibrium of Methylene Blue by Spectral Titration and Chemometrics Analysis: A Thermodynamic Study. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200900069] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Scholz M, Dědic R, Breitenbach T, Hála J. Singlet oxygen-sensitized delayed fluorescence of common water-soluble photosensitizers. Photochem Photobiol Sci 2013; 12:1873-84. [DOI: 10.1039/c3pp50170a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Molecular symmetry determines the mechanism of a very efficient ultrafast excitation-to-heat conversion in Ni-substituted chlorophylls. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1827:30-7. [DOI: 10.1016/j.bbabio.2012.09.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 08/20/2012] [Accepted: 09/10/2012] [Indexed: 11/19/2022]
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14
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Rodriguez ME, Fernández DA, Awruch J, Braslavsky SE, Dicelio LE. Effect of aggregation of a cationic phthalocyanine in micelles and in the presence of human serum albumin. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424606000053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The photophysical properties of tetrakis(1,1-dimethyl-2-trimethylammonium)ethylphthalocyaninato zinc(II) tetraiodide (I) – a water-soluble cationic phthalocyanine – are presented in the presence of human serum albumin (HSA) and in micelles of sodium dodecylsulfate ( SDS ) and hexadecyltrimethylammonium chloride ( CTAC ). Spectrophotometric measurements showed that the surfactants SDS and CTAC induce monomerization of I, although the latter less efficiently than the former. This effect is less pronounced in the presence of HSA. The strength of this effect is evaluated through dimerization constants, which are Kd = (5 ± 1) × 105 m−1 in SDS , (1.5 ± 0.5) × 106 M −1 in CTAC , and (1.8 ± 0.9) × 106 M −1 in HSA. Fluorescence experiments confirm that aggregation of I drops as the concentration of surfactant is raised. Triplet quantum yields also decreased upon aggregation and were Φ T = 0.59, 0.16, and < 0.01 in SDS , CTAC , and HSA, respectively. These results indicate that the affinity of I for the environment is not just due to ionic interactions; hydrophobic interactions play an equally important role.
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Affiliation(s)
- Myriam E. Rodriguez
- INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Departamento de Química Orgánica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
| | - Daniel A. Fernández
- INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Josefina Awruch
- Departamento de Química Orgánica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
| | - Silvia E. Braslavsky
- Max-Planck-Institut für Bioanorganische Chemie (formerly Strahlenchemie), Postfach 10 13 65, D-45413 Mülheim an der Ruhr, Germany
| | - Lelia E. Dicelio
- INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
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15
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Kruk MM, Braslavsky SE. Structural volume changes upon triplet formation of water-soluble porphyrins depend on the resonant effect of the substituents. Photochem Photobiol Sci 2012; 11:972-8. [DOI: 10.1039/c2pp05368c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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16
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Comparison of two photosensitizers Al(III) phthalocyanine chloride tetrasulfonic acid and meso-tetrakis(4-sulfonatophenyl)porphyrin in the photooxidation of n-butylparaben. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.07.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Splitting of Water by Combining Two Photocatalytic Reactions through a Quinone Compound Dissolved in an Oil Phase. Z PHYS CHEM 2011. [DOI: 10.1524/zpch.1998.1.1.365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Schaberle FA, Nunes RMD, Barroso M, Serpa C, Arnaut LG. Analytical solution for time-resolved photoacoustic calorimetry data and applications to two typical photoreactions. Photochem Photobiol Sci 2010; 9:812-22. [DOI: 10.1039/c0pp00025f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Kaneko S, Yotoriyama S, Koda H, Tobita S. Excited-state proton transfer to solvent from phenol and cyanophenols in water. J Phys Chem A 2009; 113:3021-8. [PMID: 19265389 DOI: 10.1021/jp8086489] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The excited-state proton transfer (ESPT) to solvent from phenol (PhOH) and cyanophenols (CNOHs) in water was studied by means of time-resolved fluorescence and photoacoustic spectroscopy. A characteristic property of PhOH and CNOHs is that the fluorescence quantum yields of the deprotonated forms are remarkably small (< or = 10(-3)) and the lifetimes are extremely short (< or = 30 ps). Time-resolved fluorescence measurements for PhOH, CNOHs, and their methoxy analogues at 298 K indicate that o- and m-cyanophenols (o- and m-CNOH) undergo rapid ESPT to the solvent water with rate constants of 6.6 x 10(10) and 2.6 x 10(10) s(-1), respectively, whereas the fluorescence properties of PhOH and p-CNOH does not exhibit clear evidence of the ESPT reaction. Photoacoustic measurements show that photoexcitation of o- and m-CNOH in water results in negative volume changes, supporting the occurrence of ESPT to produce a geminate ion pair. In contrast, the volume contractions for the PhOH and p-CNOH solutions are negligibly small, which indicates that, in these compounds, the yields of solvent-separated ion pairs resulting from the ESPT are very small. The volume change per absorbed Einstein (DeltaV(r)) for o-CNOH is obtained to be -5.0 mL Einstein(-1), which is much smaller than the estimated volume contraction per photoconverted mole (DeltaV(R)). This suggests that the geminate recombination between the ejected proton and the cyanophenolate anion occurs after rapid deactivation of the excited ion pair. In the temperature range between 275 and 323 K, the proton dissociation rates of o- and m-CNOH in H(2)O and D(2)O are slower than the solvent relaxation rates evaluated from the Debye dielectric relaxation time, indicating that the overall rate constant is determined mainly by the proton motion along the reaction coordinate.
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Affiliation(s)
- Shigeo Kaneko
- Department of Chemistry and Chemical Biology, Gunma University, Kiryu, Gunma 376-8515, Japan
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Montes-Navajas P, Corma A, Garcia H. Complexation and Fluorescence of Tricyclic Basic Dyes Encapsulated in Cucurbiturils. Chemphyschem 2008; 9:713-20. [DOI: 10.1002/cphc.200700735] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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21
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Andrés GO, Cabrerizo FM, Martínez-Junza V, Braslavsky SE. A Large Entropic Term Due to Water Rearrangement is Concomitant with the Photoproduction of Anionic Free-Base Porphyrin Triplet States in Aqueous Solutions†. Photochem Photobiol 2007; 83:503-10. [PMID: 17094719 DOI: 10.1562/2006-09-02-ra-1026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The enthalpy change, DeltaTH, and volume change, DeltaTV, associated with triplet state formation upon excitation of free-base meso-tetra-(4-sulfonatophenyl)porphyrin, TSPP4-, its Zn derivative, ZnTSPP4-, and meso-tetra-(4-carboxyphenyl)porphyrin, TCPP4-, were obtained in aqueous solutions by the application of laser-induced optoacoustics spectroscopy in the presence of phosphate salts of various monovalent cations (Li+, Na+, K+, NH4+ and Cs+). A linear correlation was found between DeltaTH and DeltaTV at different phosphate concentrations for the free-base porphyrins. The intercepts (132 +/- 8 kJ mol(-1) for TSPP4- and 164 +/- 23 kJ mol(-1) for TCPP4-) of these plots correspond to the respective value of the triplet energy content obtained from phosphorescence at 77 K (140 and 149 kJ mol(-1)). This suggests that DeltaTG for the triplet state formation is independent of the medium and an enthalpy-entropy compensation is responsible for the much smaller and salt-dependent DeltaTH values obtained at room temperature. The Gibbs energy for triplet state formation of the free-base porphyrins at room temperature is thus mainly determined by the entropic term due to solvent rearrangement. The DeltaTH values for 3ZnTSPP4- at different buffer concentrations and different cations are all between 130 and 150 kJ mol(-1), close to the triplet energy obtained from phosphorescence (E(T) = 155 kJ mol(-1)). The solvent structure and the nature of the counterion have a negligible influence on the 3ZnTSPP4-formation due to the blockage of the electron pairs on the central N atoms. Thus, the small DeltaTV value should be due to intrinsic bond changes upon 3ZnTSPP4- formation and no correlation between DeltaTH and DeltaTV should be expected in this case. The enthalpy change determines the Gibbs energy for 3ZnTSPP4-formation at room temperature.
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Affiliation(s)
- Gabriel O Andrés
- Max-Planck-Institut für Bioanorganische Chemie (formerly Strahlenchemie), Mülheim an der Ruhr, Germany
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22
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Borsarelli CD, Braslavsky SE, Sortino S, Marconi G, Monti S. Photodecarboxylation of Ketoprofen in Aqueous Solution. A Time-resolved Laser-induced Optoacoustic Study¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0720163pokias2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Michler I, Braslavsky SE. Time-resolved Thermodynamic Analysis of the Oat Phytochrome A Phototransformation. A Photothermal Beam Deflection Study†¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2001)0740624trtaot2.0.co2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Oertling WA, Cornellison CD, Treff NR, Watanabe J, Pressler MA, Small JR. Photoacoustic characterization of protein dynamics following CO photodetachment from fully reduced bovine cytochrome c oxidase. J Inorg Biochem 2007; 101:635-43. [PMID: 17280717 DOI: 10.1016/j.jinorgbio.2006.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2006] [Revised: 12/08/2006] [Accepted: 12/12/2006] [Indexed: 11/25/2022]
Abstract
We report a protein conformational change following carbon monoxide photodetachment from fully reduced bovine cytochrome c oxidase that is hypothesized to be associated with changes in ligand mobility through a dioxygen access channel in the protein. Although not resolved by earlier photoacoustic or optical studies on this adduct, utilization of slightly lower temperatures revealed a process with a kinetic lifetime of about 70 ns at 10 degrees C. We measure an enthalpy change of about 8 kcal/mol in 0.050 M HEPES buffer that becomes less endothermic (DeltaH approximately 2 kcal/mol) at higher ionic strength. The volume contraction of about -0.7 mL/mol associated with the process almost doubles in higher ionic strength buffer systems. Measurements of samples in phosphate buffer systems are similar and appear to display the same subtle ionic strength dependence. Both the isolation of this photoacoustic signal component and the possible dependence on ionic strength of the thermodynamic parameters derived from its analysis appear analogous to and consistent with prior photoacoustic results monitoring CO photodetachment from the camphor complex of cytochrome P-450. Accordingly, we consider a similar model in which a conformational change results in movement of an exposed charged group or groups towards the interior of the protein, out of contact with solvent, as in the closing of a salt bridge.
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Affiliation(s)
- W Anthony Oertling
- Department of Chemistry and Biochemistry, 226 Science Building, Eastern Washington University, Cheney, WA 99004-2440, USA.
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25
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Terazima M. Photothermal Studies of Photophysical and Photochemical Processes by the Transient Grating Method. ADVANCES IN PHOTOCHEMISTRY 2007. [DOI: 10.1002/9780470133552.ch5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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26
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Photophysical studies of tetratolylporphyrin photosensitizers for potential medical applications. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.12.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Staśkowiak E, Dudkowiak A. Photostability and the yield of triplet state generation of bacteriochlorophyll c and bacteriopheophytin c in solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:2033-9. [PMID: 15911389 DOI: 10.1016/j.saa.2004.08.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2004] [Accepted: 08/05/2004] [Indexed: 05/02/2023]
Abstract
The paper deals with some fast and slow processes of excitation energy deactivation in bacteriochlorophyll c and bacteriopheophytin c. The experiments were carried out in the air, and in oxygen or nitrogen atmosphere at different temperatures. The parameters such as fluorescence yield, the yield of triplet state generation and photostability were estimated. On the basis of these parameters an attempt was made to preliminary select the pigments best suited for medical applications. It seems that the photosensitive and highly fluorescent bacteriochlorophyll c could be used as a fluorescence probe for diagnosis, whereas its derivative without the magnesium ion is better suited for the photochemical reactions occurring during therapeutic treatment.
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Affiliation(s)
- Ewa Staśkowiak
- Faculty of Technical Physics, Poznań University of Technology, Nieszawska 13A, 60965 Poznań, Poland
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29
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Monteiro CJP, Pereira MM, Azenha ME, Burrows HD, Serpa C, Arnaut LG, Tapia MJ, Sarakha M, Wong-Wah-Chung P, Navaratnam S. A comparative study of water soluble 5,10,15,20-tetrakis(2,6-dichloro-3-sulfophenyl)porphyrin and its metal complexes as efficient sensitizers for photodegradation of phenols. Photochem Photobiol Sci 2005; 4:617-24. [PMID: 16052268 DOI: 10.1039/b507597a] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
5,10,15,20-Tetrakis(2,6-dichloro-3-chlorosulfophenyl)porphyrin and its tin and zinc complexes were synthesized with high yields and fully characterized. The corresponding water-soluble 5,10,15,20-tetrakis(2,6-dichloro-3-sulfophenyl)porphyrins were obtained by hydrolysis with water. An extensive photophysical study of the new water soluble porphyrinic compounds was carried out including absorption and fluorescence spectra, fluorescence quantum yields, triplet absorption spectra, triplet lifetimes, triplet and singlet oxygen quantum yields. These sensitizers were successfully used in the photodegradation of 4-chlorophenol and 2,6-dimethylphenol. A comparison is made of their efficiencies, and some mechanistic considerations are highlighted.
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Affiliation(s)
- Carlos J P Monteiro
- Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal
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Staśkowiak E, Dudkowiak A, Hanyż I, Wiktorowicz K, Frąckowiak D. Spectral properties of stilbazolium merocyanines – potential sensitizers in photodynamic therapy and diagnosis. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/s1010-6030(03)00439-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Lang K, Mosinger J, Wagnerová D. Photophysical properties of porphyrinoid sensitizers non-covalently bound to host molecules; models for photodynamic therapy. Coord Chem Rev 2004. [DOI: 10.1016/j.ccr.2004.02.004] [Citation(s) in RCA: 371] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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32
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Zhang G, Shuang S, Dong C, Pan J. Study on the interaction of methylene blue with cyclodextrin derivatives by absorption and fluorescence spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2935-41. [PMID: 14583269 DOI: 10.1016/s1386-1425(03)00123-9] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The ability of beta-cyclodextrin (beta-CD), hydroxypropyl-beta-cyclodextrin (HP-beta-CD), and carboxymethyl-beta-cyclodextrin (CM-beta-CD) to break the aggregate of the methylene blue (MB) and to form 1:1 inclusion complexes has been studied by absorption and fluorescence spectroscopy. Experimental conditions including concentrations of various cyclodextrins (beta-CD, HP-beta-CD and CM-beta-CD) and media acidity were investigated for the inclusion formation in detail. The formation constants are calculated by using steady-state fluorimetry, from which the inclusion capacity of different cyclodextrins (CDs) is compared. The results suggest that the charged beta-cyclodextrin (CM-beta-CD) is more suitable for inclusion of the cationic dye MB than the neutral beta-cyclodextrins (beta-CD, HP-beta-CD) at pH>5. A mechanism is proposed which is consistent with the stronger binding of MB with CM-beta-CD compared with the other CDs at pH>5.
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Affiliation(s)
- Guomei Zhang
- Department of Chemistry, Shanxi University, Shanxi, Taiyuan 030006, China
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Chen H, Li G, Zhang FF, Sun L, Chen HL, Zhang SY. Co-C bond dissociation energy and reaction volume change of 2',5'-dideoxyadenosylcobalamin studied by laser-induced time-resolved photoacoustic calorimetry. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2767-2774. [PMID: 14499837 DOI: 10.1016/s1386-1425(03)00057-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Time resolved photoacoustic calorimetry (PAC) was applied to a study of the photolysis of a coenzyme B(12) analog 2',5'-dideoxyadenosylcobalamin, which lacks an -OH group at the 2' position of ribofuranose ring. In aqueous solution, we report for the first time the quantum yield Phi(d) (0.25+/-0.02), Co-C bond dissociation energy (BDE; 31.8+/-2.5 kcal mol(-1)) and reaction volume change deltaV(R) (6.5+/-0.5 ml mol(-1)) due to conformation changes of the corrin ring and its side chains accompanying the cleavage of the Co-C bond. These values for the analog are very similar to those for the natural cofactor. Based our results and previous studies, a possible explanation for the similarity in their structure and properties versus the large difference in their enzymatic activity is discussed.
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Affiliation(s)
- Hao Chen
- Department of Chemistry, Nanjing University, Hankou Road 22, Nanjing 210093, People's Republic of China
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34
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Gensch T, Viappiani C. Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biology. Photochem Photobiol Sci 2003; 2:699-721. [PMID: 12911218 DOI: 10.1039/b303177b] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photothermal methods are currently being employed in a variety of research areas, ranging from materials science to environmental monitoring. Despite the common term which they are collected under, the implementations of these techniques are as diverse as the fields of application. In this review, we concentrate on the recent applications of time-resolved methods in photochemistry and photobiology.
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Affiliation(s)
- Thomas Gensch
- Forschungszentrum Jülich, Institut für Biologische Informationsverarbeitung 1, 52425 Jülich, Germany.
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35
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The interactions between tetrapyridyl porphyrin and viologen units covalently linked to polymers. J Photochem Photobiol A Chem 2003. [DOI: 10.1016/s1010-6030(03)00190-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Abbruzzetti S, Carcelli M, Rogolino D, Viappiani C. Deprotonation yields, pKa, and aci-nitro decay rates in some substituted o-nitrobenzaldehydes. Photochem Photobiol Sci 2003; 2:796-800. [PMID: 12911230 DOI: 10.1039/b301818k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper we report the deprotonation yields, the pKa, and decay kinetics of the aci-nitro intermediates of some substituted 2-nitrobenzaldehydes that can be used as photoactivatable caged proton compounds. The decay of the aci-nitro absorbance for 2-nitrobenzaldehyde occurs within a few nanoseconds from photoexcitation. Addition of electron donating methoxy substituents at positions 4 and 5 leads to lower deprotonation yields, higher pKa, and slower decays of the aci-nitro intermediates. On the contrary, the decay rate is accelerated by the introduction of an electron-withdrawing Cl atom at position 4 in the phenyl ring, with little influence on the deprotonation yield and pKa of the aci-nitro intermediate.
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Affiliation(s)
- Stefania Abbruzzetti
- Dipartimento di Fisica, Università di Parma, Istituto Nazionale per la Fisica della Materia, Parco Area delle Scienze 7A, 43100 Parma, Italy
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Hellingwerf KJ, Hendriks J, Gensch T. Photoactive Yellow Protein, A New Type of Photoreceptor Protein: Will This “Yellow Lab” Bring Us Where We Want to Go? J Phys Chem A 2003. [DOI: 10.1021/jp027005y] [Citation(s) in RCA: 248] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Klaas J. Hellingwerf
- Laboratory for Microbiology, Swammerdam Institute for Life Sciences (SILS), BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute of Biological Information Processing 1, Research Centre Jülich, D-52425 Jülich, Germany
| | - Johnny Hendriks
- Laboratory for Microbiology, Swammerdam Institute for Life Sciences (SILS), BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute of Biological Information Processing 1, Research Centre Jülich, D-52425 Jülich, Germany
| | - Thomas Gensch
- Laboratory for Microbiology, Swammerdam Institute for Life Sciences (SILS), BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, and Institute of Biological Information Processing 1, Research Centre Jülich, D-52425 Jülich, Germany
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Molecular volume and enthalpy changes associated with irreversible photo-reactions. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2002. [DOI: 10.1016/s1389-5567(02)00021-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Borsarelli CD, Bertolotti SG, Previtali CM. Thermodynamic changes in the photoinduced proton-transfer reaction of the triplet state of safranine-T. Photochem Photobiol Sci 2002; 1:574-80. [PMID: 12659500 DOI: 10.1039/b202683j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enthalpy and volume changes occurring in the triplet excited state proton-transfer reactions of safranine-T (SH+) in aqueous solutions at pH 4.8, 8.3, and 10.4 were investigated using time-resolved photoacoustics (TRP). The transient triplet state species were also studied using laser-flash photolysis (LFP). The LFP experiments showed the prompt formation of 3SH+ with a triplet quantum yield phiT = 0.28 between pH 4.8 and 10.4. At pH 8.3 3SH+ decays directly to the ground state. However, at pH 4.8 and 10.4, 3SH+ reacts with protons or hydroxy ions to form the dication 3SH2(2+) or the neutral 3S species, with diffusion-controlled rate constants of kH+ = 1.6 x 10(10) M(-1) s(-1), and kHO- = 2.6 x 10(10) M(-1) s(-1), respectively. Under the same experimental conditions, the TRP measurements allowed the accurate determination of the energy content of the rapidly formed triplet state 3SH+ i.e. E(T) = 175 kJ mol(-1). The slow component (0.1-3 micros) of the TRP signal at pH 4.8 and 10.4 was attributed to the formation of the species 3SH2(2+) and 3S, respectively. The enthalpy changes associated with the proton-transfer reactions of 3SH+, calculated from the values of the heat released as obtained by TRP, were in remarkable agreement with the values estimated from the thermodynamic data of the acid-base equilibria of the triplet states of the dye. The formation of 3SH+ was accompanied by a volume expansion of 1.8 cm3 mol(-1), which was explained by changes in the hydrogen-bonding interaction of the dye with its solvation sphere. Instead, the volume changes observed upon the formation of 3SH2(2-) and 3S accounted for the electrostrictive effect produced by the change in the charge distribution on the dye after the proton-transfer reaction.
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Affiliation(s)
- Claudio D Borsarelli
- Instituto de Ciencias Quimicas, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912. 4200, Santiago del Estero, Argentina.
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Kubát P, Lang K, Král V, Anzenbacher P. Preprogramming of Porphyrin−Nucleic Acid Assemblies via Variation of the Alkyl/Aryl Substituents of Phosphonium Tetratolylporphyrins. J Phys Chem B 2002. [DOI: 10.1021/jp014405x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Pavel Kubát
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Kamil Lang
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Vladimír Král
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Pavel Anzenbacher
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
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Michler I, Braslavsky SE. Time-resolved thermodynamic analysis of the oat phytochrome A phototransformation. A photothermal beam deflection study. Photochem Photobiol 2001; 74:624-35. [PMID: 11683044 DOI: 10.1562/0031-8655(2001)074<0624:trtaot>2.0.co;2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The time-resolved enthalpy and the structural volume changes after excitation of native oat phytochrome A were studied in the micro- to milliseconds range by photothermal beam deflection (PBD), a technique that follows the time-resolved refractive index changes upon decay of the excited species. The first set of intermediates, I700(1) and I700(2), stores ca 83% of the energy of the first excited state, in agreement with previous optoacoustic data, whereas the second set stores only ca 18%. The temperature dependence of the amplitudes ratio for the optical absorbances of the (I700(1) + I700(2)) intermediates set is explained on the basis of the thermochromic equilibrium between Pr,657 and Pr,672, which also is in line with the present PBD data. These data were best fitted with a parallel mechanism (with equal yield in each branch) for the production of the first set of intermediates, I700(1) and I700(2), as well as the second set of intermediates, Ibl1 and Ibl2. Thus, the final steps toward Pfr should be largely driven by positive entropic changes brought about by protein movements, in line with previous resonance Raman data. For the production of the first set of intermediates (I700(1) and I700(2)) an expansion of 18 +/- 13 mL mol-1 was determined, and a further expansion > or = 7 mL mol-1 was estimated for the decay from I700(1) to the set of Ibl intermediates, indicating that the far red-absorbing form of phytochrome (Pfr) has a larger volume than the red-absorbing form of phytochrome. This is in agreement with previous chromatographic and circular dichroism data according to which Pfr shows a larger volume and the chromophore shows a higher accessibility, respectively, in the Pfr state.
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Affiliation(s)
- I Michler
- Max-Planck-Institut für Strahlenchemie, Postfach 10 13 65, D-45473 Mülheim an der Ruhr, Germany
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Abbruzzetti S, Viappiani C, Small JR, Libertini LJ, Small EW. Kinetics of local helix formation in poly-L-glutamic acid studied by time-resolved photoacoustics: neutralization reactions of carboxylates in aqueous solutions and their relevance to the problem of protein folding. Biophys J 2000; 79:2714-21. [PMID: 11053143 PMCID: PMC1301151 DOI: 10.1016/s0006-3495(00)76509-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Photoactivatable caged protons have been used to trigger proton transfer reactions in aqueous solutions of acetate, glutamate, and poly-L-glutamic acid, and the volumetric and enthalpic changes have been detected and characterized by means of time-resolved photoacoustics. Neutralization of carboxylates in aqueous solutions invariably results in an expansion of the solution due to the disappearance of two charges and is accompanied by little enthalpic change. The reactions occur with thermally activated, apparent bimolecular rates on the order of 10(10) M(-1)s(-1). In the case of aqueous solutions of poly-L-glutamic acid at pH around the pK(a) of the coil-to-helix transition, diffusional binding of a proton by carboxylates is followed by a sequential reaction with rate 1.06 (+/- 0.05) x 10(7)s(-1). This step is not thermally activated in the temperature range we have investigated and is likely related to local formation of hydrogen bonds near the protonation site. This structural event may constitute a rate-limiting step in helix propagation.
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Affiliation(s)
- S Abbruzzetti
- Dipartimento di Fisica, Università di Parma and Istituto Nazionale per la Fisica della Materia, Parma, Italy
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Affiliation(s)
- K Briviba
- Institut für Ernährungsphysiologie, Bundesforschungsanstalt für Ernährung, Karlsruhe, Germany
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Borsarelli CD, Braslavsky SE, Sortino S, Marconi G, Monti S. Photodecarboxylation of ketoprofen in aqueous solution. A time-resolved laser-induced optoacoustic study. Photochem Photobiol 2000; 72:163-71. [PMID: 10946568 DOI: 10.1562/0031-8655(2000)072<0163:pokias>2.0.co;2] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The photodecarboxylation reaction of 2-(3-benzoylphenyl)propionate (ketoprofen anion, KP-) was studied in water and in 0.1 M phosphate buffer solutions in the pH range 5.7-11.0 by laser-induced optoacoustic spectroscopy (LIOAS, T range 9.5-31.6 degrees C). Upon exciting KP- with 355 nm laser pulses under anaerobic conditions, two components in the LIOAS signals with well-separated lifetimes were found (tau 1 < 20 ns; 250 < tau 2 < 500 ns) in the whole pH range, whereas a long-lived third component (4 < tau 3 < 10 microseconds) was only detected at pH < or = 6.1. The heat and structural volume changes accompanying the first step did not depend on pH or on the presence of buffer. The carbanion resulting from prompt decarboxylation within the nanosecond pulse (< 10 ns) drastically reduces its molar volume ([-18.9 +/- 2.0] cm3/mol) with respect to KP- and its enthalpy content is (256 +/- 10) kJ/mol. At acid pH (ca 6), a species is formed with a lifetime in the hundreds of ns. The enthalpy and structural volume change for this species with respect to KP- are (181 +/- 15) kJ/mol and (+0.6 +/- 2.0) cm3/mol, respectively. This species is most likely a neutral biradical formed by protonation of the decarboxylated carbanion, and decays to the final product 3-ethylbenzophenone in several microsecond. At basic pH (ca 11), direct formation of 3-ethylbenzophenone occurs in hundreds of ns involving a reaction with the solvent. The global decarboxylation reaction is endothermic ([45 +/- 15] kJ/mol) and shows an expansion of (+14.5 +/- 0.5) cm3/mol with respect to KP-. At low pH, the presence of buffer strongly affects the magnitude of the structural volume changes associated with intermolecular proton-transfer processes of the long-lived species due to reactions of the buffer anion with the decarboxylated ketoprofen anion.
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Affiliation(s)
- C D Borsarelli
- Departamento de Química y Física, Universidad Nacional de Rio Cuarto, Argentina.
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Herbrich RP, Schmidt R. Investigation of the pyrene/N,N′-diethylaniline exciplex by photoacoustic calorimetry and fluorescence spectroscopy. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(00)00216-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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47
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Li G, Zhang F, Yin H, Chen H, Zhang S. Using time-resolved photoacoustic calorimetry to study triplet energy and lifetime for benzophenone-KI system. CHINESE SCIENCE BULLETIN-CHINESE 2000. [DOI: 10.1007/bf02909764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Abbruzzetti S, Crema E, Masino L, Vecli A, Viappiani C, Small JR, Libertini LJ, Small EW. Fast events in protein folding: structural volume changes accompanying the early events in the N-->I transition of apomyoglobin induced by ultrafast pH jump. Biophys J 2000; 78:405-15. [PMID: 10620304 PMCID: PMC1300648 DOI: 10.1016/s0006-3495(00)76603-3] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ultrafast, laser-induced pH jump with time-resolved photoacoustic detection has been used to investigate the early protonation steps leading to the formation of the compact acid intermediate (I) of apomyoglobin (ApoMb). When ApoMb is in its native state (N) at pH 7.0, rapid acidification induced by a laser pulse leads to two parallel protonation processes. One reaction can be attributed to the binding of protons to the imidazole rings of His24 and His119. Reaction with imidazole leads to an unusually large contraction of -82 +/- 3 ml/mol, an enthalpy change of 8 +/- 1 kcal/mol, and an apparent bimolecular rate constant of (0.77 +/- 0.03) x 10(10) M(-1) s(-1). Our experiments evidence a rate-limiting step for this process at high ApoMb concentrations, characterized by a value of (0. 60 +/- 0.07) x 10(6) s(-1). The second protonation reaction at pH 7. 0 can be attributed to neutralization of carboxylate groups and is accompanied by an apparent expansion of 3.4 +/- 0.2 ml/mol, occurring with an apparent bimolecular rate constant of (1.25 +/- 0.02) x 10(11) M(-1) s(-1), and a reaction enthalpy of about 2 kcal/mol. The activation energy for the processes associated with the protonation of His24 and His119 is 16.2 +/- 0.9 kcal/mol, whereas that for the neutralization of carboxylates is 9.2 +/- 0.9 kcal/mol. At pH 4.5 ApoMb is in a partially unfolded state (I) and rapid acidification experiments evidence only the process assigned to carboxylate protonation. The unusually large contraction and the high energetic barrier observed at pH 7.0 for the protonation of the His residues suggests that the formation of the compact acid intermediate involves a rate-limiting step after protonation.
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Affiliation(s)
- S Abbruzzetti
- Dipartimento di Fisica, Università di Parma, 43100 Parma, Italia
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Supramolecular sensitizer: complexation of meso-tetrakis(4-sulfonatophenyl)porphyrin with 2-hydroxypropyl-cyclodextrins. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(99)00204-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ohno T, Fujihara K, Sarukawa K, Tanigawa F, Matsumura M. Splitting of Water by Combining Two Photocatalytic Reactions through a Quinone Compound Dissolved in an Oil Phase. ACTA ACUST UNITED AC 1999. [DOI: 10.1524/zpch.1999.213.part_2.165] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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