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Mie Y, Okabe H, Mikami C, Motomura T, Matsuda N. Nanostructured gold thin film electrode derived from surfactant-free gold nanoparticles for enhanced electrocatalysis. Electrochem commun 2023. [DOI: 10.1016/j.elecom.2022.107415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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2
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Mao C, Yuan D, Wang L, Bakker E. Separating boundary potential changes at thin solid contact ion transfer voltammetric membrane electrodes. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114800] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Buhrke D, Hildebrandt P. Probing Structure and Reaction Dynamics of Proteins Using Time-Resolved Resonance Raman Spectroscopy. Chem Rev 2019; 120:3577-3630. [PMID: 31814387 DOI: 10.1021/acs.chemrev.9b00429] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The mechanistic understanding of protein functions requires insight into the structural and reaction dynamics. To elucidate these processes, a variety of experimental approaches are employed. Among them, time-resolved (TR) resonance Raman (RR) is a particularly versatile tool to probe processes of proteins harboring cofactors with electronic transitions in the visible range, such as retinal or heme proteins. TR RR spectroscopy offers the advantage of simultaneously providing molecular structure and kinetic information. The various TR RR spectroscopic methods can cover a wide dynamic range down to the femtosecond time regime and have been employed in monitoring photoinduced reaction cascades, ligand binding and dissociation, electron transfer, enzymatic reactions, and protein un- and refolding. In this account, we review the achievements of TR RR spectroscopy of nearly 50 years of research in this field, which also illustrates how the role of TR RR spectroscopy in molecular life science has changed from the beginning until now. We outline the various methodological approaches and developments and point out current limitations and potential perspectives.
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Affiliation(s)
- David Buhrke
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17, Juni 135, D-10623 Berlin, Germany
| | - Peter Hildebrandt
- Technische Universität Berlin, Institut für Chemie, Sekr. PC14, Straße des 17, Juni 135, D-10623 Berlin, Germany
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5
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Bellei M, Bortolotti CA, Di Rocco G, Borsari M, Lancellotti L, Ranieri A, Sola M, Battistuzzi G. The influence of the Cys46/Cys55 disulfide bond on the redox and spectroscopic properties of human neuroglobin. J Inorg Biochem 2018; 178:70-86. [DOI: 10.1016/j.jinorgbio.2017.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/21/2017] [Accepted: 10/09/2017] [Indexed: 12/21/2022]
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6
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Samajdar RN, Manogaran D, Yashonath S, Bhattacharyya AJ. Using porphyrin–amino acid pairs to model the electrochemistry of heme proteins: experimental and theoretical investigations. Phys Chem Chem Phys 2018; 20:10018-10029. [DOI: 10.1039/c8cp00605a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deconstructing the complex electrochemistry of heme proteins into simpler heme–amino acid interactions.
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Affiliation(s)
- Rudra N. Samajdar
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - Dhivya Manogaran
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - S. Yashonath
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
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7
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Reuillard B, Ly KH, Rosser TE, Kuehnel MF, Zebger I, Reisner E. Tuning Product Selectivity for Aqueous CO 2 Reduction with a Mn(bipyridine)-pyrene Catalyst Immobilized on a Carbon Nanotube Electrode. J Am Chem Soc 2017; 139:14425-14435. [PMID: 28885841 PMCID: PMC5649446 DOI: 10.1021/jacs.7b06269] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
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The
development of high-performance electrocatalytic systems for the controlled
reduction of CO2 to value-added chemicals is a key goal
in emerging renewable energy technologies. The lack of selective and
scalable catalysts in aqueous solution currently hampers the implementation
of such a process. Here, the assembly of a [MnBr(2,2′-bipyridine)(CO)3] complex anchored to a carbon nanotube electrode via a pyrene
unit is reported. Immobilization of the molecular catalyst allows
electrocatalytic reduction of CO2 under fully aqueous conditions
with a catalytic onset overpotential of η = 360 mV, and controlled
potential electrolysis generated more than 1000 turnovers at η
= 550 mV. The product selectivity can be tuned by alteration of the
catalyst loading on the nanotube surface. CO was observed as the main
product at high catalyst loadings, whereas formate was the dominant
CO2 reduction product at low catalyst loadings. Using UV–vis
and surface-sensitive IR spectroelectrochemical techniques, two different
intermediates were identified as responsible for the change in selectivity
of the heterogenized Mn catalyst. The formation of a dimeric Mn0 species at higher surface loading was shown to preferentially
lead to CO formation, whereas at lower surface loading the electrochemical
generation of a monomeric Mn-hydride is suggested to greatly enhance
the production of formate. These results emphasize the advantages
of integrating molecular catalysts onto electrode surfaces for enhancing
catalytic activity while allowing excellent control and a deeper understanding
of the catalytic mechanisms.
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Affiliation(s)
- Bertrand Reuillard
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Khoa H Ly
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Timothy E Rosser
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Moritz F Kuehnel
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Ingo Zebger
- Max Volmer Laboratorium für Biophysikalische Chemie, Sekretariat PC14, Institut für Chemie, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Erwin Reisner
- Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Bandarenka AS, Williams R, Plumeré N. Anodic Desorption Monitored by Voltammetric and Gravimetric Measurements for Fast Estimation of Surface Coverage of Complex Organic Molecules on Au Electrodes. ELECTROANAL 2016. [DOI: 10.1002/elan.201600243] [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)
- Aliaksandr S. Bandarenka
- Center for Electrochemical Sciences - CES, Ruhr-Universität Bochum; Universitätsstr. 150; D-44780 Bochum Germany
- Physik-Department ECS; Technische Universität München; James-Franck-Strasse 1 85748 Garching Germany
- Nanosystems Initiative Munich (NIM); Schellingstrassee 4 80799 Munich Germany
| | - Rhodri Williams
- Center for Electrochemical Sciences - CES, Ruhr-Universität Bochum; Universitätsstr. 150; D-44780 Bochum Germany
| | - Nicolas Plumeré
- Center for Electrochemical Sciences - CES, Ruhr-Universität Bochum; Universitätsstr. 150; D-44780 Bochum Germany
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9
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Capitao D, Sahli R, Raouafi N, Limoges B, Fave C, Schöllhorn B. Electro-assisted Deposition of Binary Self-Assembled 1,2-Dithiolane Monolayers on Gold with Predictable Composition. ChemElectroChem 2016. [DOI: 10.1002/celc.201600260] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dany Capitao
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591; Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier; 15 rue Jean-Antoine de Baïf 75205 Paris Cedex 13 France
| | - Rihab Sahli
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591; Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier; 15 rue Jean-Antoine de Baïf 75205 Paris Cedex 13 France
- Laboratoire de Chimie Analytique et d'Electrochimie; Département de Chimie, Faculté des Sciences de Tunis; Université El-Manar; 2092 Tunis El-Manar Tunisia
| | - Noureddine Raouafi
- Laboratoire de Chimie Analytique et d'Electrochimie; Département de Chimie, Faculté des Sciences de Tunis; Université El-Manar; 2092 Tunis El-Manar Tunisia
| | - Benoit Limoges
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591; Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier; 15 rue Jean-Antoine de Baïf 75205 Paris Cedex 13 France
| | - Claire Fave
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591; Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier; 15 rue Jean-Antoine de Baïf 75205 Paris Cedex 13 France
| | - Bernd Schöllhorn
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591; Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier; 15 rue Jean-Antoine de Baïf 75205 Paris Cedex 13 France
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10
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Trashin S, de Jong M, Luyckx E, Dewilde S, De Wael K. Electrochemical Evidence for Neuroglobin Activity on NO at Physiological Concentrations. J Biol Chem 2016; 291:18959-66. [PMID: 27402851 DOI: 10.1074/jbc.m116.730176] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Indexed: 11/06/2022] Open
Abstract
The true function of neuroglobin (Ngb) and, particularly, human Ngb (NGB) has been under debate since its discovery 15 years ago. It has been expected to play a role in oxygen binding/supply, but a variety of other functions have been put forward, including NO dioxygenase activity. However, in vitro studies that could unravel these potential roles have been hampered by the lack of an Ngb-specific reductase. In this work, we used electrochemical measurements to investigate the role of an intermittent internal disulfide bridge in determining NO oxidation kinetics at physiological NO concentrations. The use of a polarized electrode to efficiently interconvert the ferric (Fe(3+)) and ferrous (Fe(2+)) forms of an immobilized NGB showed that the disulfide bridge both defines the kinetics of NO dioxygenase activity and regulates appearance of the free ferrous deoxy-NGB, which is the redox active form of the protein in contrast to oxy-NGB. Our studies further identified a role for the distal histidine, interacting with the hexacoordinated iron atom of the heme, in oxidation kinetics. These findings may be relevant in vivo, for example, in blocking apoptosis by reduction of ferric cytochrome c, and gentle tuning of NO concentration in the tissues.
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Affiliation(s)
| | | | - Evi Luyckx
- Biomedical Sciences, University of Antwerp, 2010 Antwerp, Belgium
| | - Sylvia Dewilde
- Biomedical Sciences, University of Antwerp, 2010 Antwerp, Belgium
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11
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Holzinger M, Le Goff A, Cosnier S. Supramolecular immobilization of bio-entities for bioelectrochemical applications. NEW J CHEM 2014. [DOI: 10.1039/c4nj00755g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Supramolecular systems based on host-guest, electrostatic, or metal-ligand interaction and their use in bioelectrochemical applications are reviewed.
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Affiliation(s)
| | - Alan Le Goff
- Univ. Grenoble Alpes - CNRS
- DCM UMR 5250
- F-38000 Grenoble, France
| | - Serge Cosnier
- Univ. Grenoble Alpes - CNRS
- DCM UMR 5250
- F-38000 Grenoble, France
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12
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Campbell WH, Henig J, Plumeré N. Affinity binding via Zinc(II) for controlled orientation and electrochemistry of Histidine-tagged nitrate reductase in self-assembled monolayers. Bioelectrochemistry 2013; 93:46-50. [DOI: 10.1016/j.bioelechem.2012.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2011] [Revised: 06/22/2012] [Accepted: 07/11/2012] [Indexed: 11/25/2022]
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13
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Sahli R, Fave C, Raouafi N, Boujlel K, Schöllhorn B, Limoges B. Switching on/off the chemisorption of thioctic-based self-assembled monolayers on gold by applying a moderate cathodic/anodic potential. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5360-5368. [PMID: 23540684 DOI: 10.1021/la401117u] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An in situ and real-time electrochemical method has been devised for quantitatively monitoring the self-assembly of a ferrocene-labeled cyclic disulfide derivative (i.e., a thioctic acid derivative) on a polycrystalline gold electrode under electrode polarization. Taking advantage of the high sensitivity, specificity, accuracy, and temporal resolution of this method, we were able to demonstrate an unexpectedly facilitated formation of the redox-active SAM when the electrode was held at a moderate cathodic potential (-0.4 V vs SCE in CH3CN), affording a saturated monolayer from only micromolar solutions in less than 10 min, and a totally impeded SAM growth when the electrode was polarized at a slightly anodic potential (+0.5 V vs SCE in CH3CN). This method literally allows for switching on/off the formation of SAMs under "soft" conditions. Moreover the cyclic disulfide-based SAM was completely desorbed at this potential contrary to the facilitated deposition of a ferrocene-labeled alkanethiol. Such a strikingly contrasting behavior could be explained by an energetically favored release of the thioctic-based SAM through homolytic cleavage of the Au-S bond followed by intramolecular cyclization of the generated thiyl diradicals. Moreover, the absence of a discernible transient faradaic current response during the potential-assisted adsorption/desorption of the redox-labeled cyclic disulfide led us to conclude in a potential-dependent reversible surface reaction where no electron is released or consumed. These results provide new insights into the formation of disulfide-based SAMs on gold but also raise some fundamental questions about the intimate mechanism involved in the facilitated adsorption/desorption of SAMs under electrode polarization. Finally, the possibility to easily and selectively address the formation/removal of thioctic-based SAMs on gold by applying a moderate cathodic/anodic potential offers another degree of freedom in tailoring their properties and in controlling their self-assembly, nanostructuration, and/or release.
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Affiliation(s)
- Rihab Sahli
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris cedex, France
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14
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Kitagawa T, Matsubara H, Komatsu K, Hirai K, Okazaki T, Hase T. Ideal redox behavior of the high-density self-assembled monolayer of a molecular tripod on a Au(111) surface with a terminal ferrocene group. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4275-4282. [PMID: 23470152 DOI: 10.1021/la305092g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A dyad consisting of a tripod-shaped trithiol with an adamantane core and a terminal ferrocenyl group linked through ap-phenyleneethynylene bridge was synthesized. The trithiol formed a stable self-assembled monolayer (SAM) on Au(111), wherein each molecule is bound to the surface by three-point adsorption using all sulfur atoms, with confirmation by PM-IRRAS and XPS analyses. Cyclic voltammetry of the SAM showed a line shape typical of an ideal adsorbed system, that is, a monolayer with negligible electrostatic interaction among the terminal ferrocenyl groups. Thus, a rare SAM was achieved, in which the component molecules were isolated from adjacent molecules without the coadsorption of nonelectroactive molecules.
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Affiliation(s)
- Toshikazu Kitagawa
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, Japan.
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15
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Mielecki M, Wojtasik J, Zborowska M, Kurzątkowska K, Grzelak K, Dehaen W, Radecki J, Radecka H. Oriented immobilization of His-tagged kinase RIO1 protein on redox active N-(IDA-like)-Cu(II) monolayer deposited on gold electrode—The base of electrochemical biosensor. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.02.085] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Chen K, Schmittel M. Reversible binding and quantification of heparin and chondroitin sulfate in water using redox-stable biferrocenylene SAMs. Analyst 2013; 138:2405-10. [DOI: 10.1039/c3an36781a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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17
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Valenti LE, Martins VL, Herrera E, Torresi RM, Giacomelli CE. Ni(ii)-modified solid substrates as a platform to adsorb His-tag proteins. J Mater Chem B 2013; 1:4921-4931. [DOI: 10.1039/c3tb20769b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Tsujimura S, Asahi M, Goda-Tsutsumi M, Shirai O, Kano K, Miyazaki K. Direct electron transfer to a metagenome-derived laccase fused to affinity tags near the electroactive copper site. Phys Chem Chem Phys 2013; 15:20585-9. [DOI: 10.1039/c3cp53096e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Schaming D, Renault C, Tucker RT, Lau-Truong S, Aubard J, Brett MJ, Balland V, Limoges B. Spectroelectrochemical characterization of small hemoproteins adsorbed within nanostructured mesoporous ITO electrodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14065-14072. [PMID: 22957653 DOI: 10.1021/la302913j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
3D nanostructured transparent indium tin oxide (ITO) electrodes prepared by glancing angle deposition (GLAD) were used for the spectroelectrochemical characterization of cytochrome c (Cyt c) and neuroglobin (Nb). These small hemoproteins, involved as electron-transfer partners in the prevention of apoptosis, are oppositely charged at physiological pH and can each be adsorbed within the ITO network under different pH conditions. The resulting modified electrodes were investigated by UV-visible absorption spectroscopy coupled with cyclic voltammetry. By using nondenaturating adsorption conditions, we demonstrate that both proteins are capable of direct electron transfer to the conductive ITO surface, sharing apparent standard potentials similar to those reported in solution. Preservation of the 3D protein structure upon adsorption was confirmed by resonance Raman (rR) spectroscopy. Analysis of the derivative cyclic voltabsorptograms (DCVA) monitored either in the Soret or the Q bands at scan rates up to 1 V s(-1) allowed us to investigate direct interfacial electron transfer kinetics. From the DCVA shape and scan rate dependences, we conclude that the interaction of Cyt c with the ITO surface is more specific than Nb, suggesting an oriented adsorption of Cyt c and a random adsorption of Nb on the ITO surface. At the same time, Cyt c appears more sensitive to the experimental adsorption conditions, and complete denaturation of Cyt c may occur as evidenced from cross-correlation of rR spectroscopy and spectroelectrochemistry.
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Affiliation(s)
- Delphine Schaming
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité, Paris, France
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20
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Breuer R, Schmittel M. Redox-Stable SAMs in Water (pH 0–12) from 1,1′-Biferrocenylene-Terminated Thiols on Gold. Organometallics 2012. [DOI: 10.1021/om300718k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Rochus Breuer
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Straße
2, D-57068 Siegen, Germany
| | - Michael Schmittel
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Straße
2, D-57068 Siegen, Germany
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21
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Renault C, Andrieux CP, Tucker RT, Brett MJ, Balland V, Limoges B. Unraveling the mechanism of catalytic reduction of O2 by microperoxidase-11 adsorbed within a transparent 3D-nanoporous ITO film. J Am Chem Soc 2012; 134:6834-45. [PMID: 22448869 DOI: 10.1021/ja301193s] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nanoporous films of indium tin oxide (ITO), with thicknesses ranging from 250 nm to 2 μm, were prepared by Glancing Angle Deposition (GLAD) and used as highly sensitive transparent 3D-electrodes for quantitatively interrogating, by time-resolved spectroelectrochemistry, the reactivity of microperoxidase-11 (MP-11) adsorbed within such films. The capacitive current densities of these 3D-electrodes as well as the amount of adsorbed MP-11 were shown to be linearly correlated to the GLAD ITO film thickness, indicating a homogeneous distribution of MP-11 across the film as well as homogeneous film porosity. Under saturating adsorption conditions, MP-11 film concentration as high as 60 mM was reached. This is equivalent to a stack of 110 monolayers of MP-11 per micrometer film thickness. This high MP-11 film loading combined with the excellent ITO film conductivity has allowed the simultaneous characterization of the heterogeneous one-electron transfer dynamics of the MP-11 Fe(III)/Fe(II) redox couple by cyclic voltammetry and cyclic voltabsorptometry, up to a scan rate of few volts per second with a satisfactory single-scan signal-to-noise ratio. The potency of the method to unravel complex redox coupled chemical reactions was also demonstrated with the catalytic reduction of oxygen by MP-11. In the presence of O(2), cross-correlation of electrochemical and spectroscopic data has allowed us to determine the key kinetics and thermodynamics parameters of the redox catalysis that otherwise could not be easily extracted using conventional protein film voltammetry. On the basis of numerical simulations of cyclic voltammograms and voltabsorptograms and within the framework of different plausible catalytic reaction schemes including appropriate approximations, it was shown possible to discriminate between different possible catalytic pathways and to identify the relevant catalytic cycle. In addition, from the best fits of simulations to the experimental voltammograms and voltabsorptograms, the partition coefficient of O(2) for the ITO film as well as the values of two kinetic rate constants could be extracted. It was finally concluded that the catalytic reduction of O(2) by MP-11 adsorbed within nanoporous ITO films occurs via a 2-electron mechanism with the formation of an intermediate Fe(III)-OOH adduct characterized by a decay rate of 11 s(-1). The spectroelectroanalytical strategy presented here opens new opportunities for characterizing complex redox-coupled chemical reactions not only with redox proteins, but also with redox biomimetic systems and catalysts. It might also be of great interest for the development and optimization of new spectroelectrochemical sensors and biosensors, or eventually new photoelectrocatalytic systems or biofuel cells.
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Affiliation(s)
- Christophe Renault
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France
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22
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Frasconi M, Mazzei F. Electrochemically controlled assembly and logic gates operations of gold nanoparticle arrays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3322-3331. [PMID: 22225408 DOI: 10.1021/la203985n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The reversible assembly of β-cyclodextrin-functionalized gold NPs (β-CD Au NPs) is studied on mixed self-assembled monolayer (SAM), formed by coadsorption of redox-active ferrocenylalkylthiols and n-alkanethiols on gold surfaces. The surface coverage and spatial distribution of the β-CD Au NPs monolayer on the gold substrate are tuned by the self-assembled monolayer composition. The binding and release of β-CD Au NPs to and from the SAMs modified surface are followed by surface plasmon resonance (SPR) spectroscopy. The redox state of the tethered ferrocene in binary SAMs controls the formation of the supramolecular interaction between ferrocene moieties and β-CD-capped Au NPs. As a result, the potential-induced uptake and release of β-CD Au NPs to and from the surface is accomplished. The competitive binding of β-CD Au NPs with guest molecules in solution shifted the equilibrium of the complexation-decomplexation process involving the supramolecular interaction with the Fc-functionalized surface. The dual controlled assembly of β-CD Au NPs on the surface enabled to use two stimuli as inputs for logic gate activation; the coupling between the localized surface plasmon, associated with the Au NP, and the surface plasmon wave, associated with the thin metal surface, is implemented as readout signal for "AND" logic gate operations.
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Affiliation(s)
- Marco Frasconi
- Department of Chemistry and Drug Technology, Sapienza University of Rome, Piazzale Aldo Moro 5, Rome 00185, Italy.
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23
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Ley C, Holtmann D, Mangold KM, Schrader J. Immobilization of histidine-tagged proteins on electrodes. Colloids Surf B Biointerfaces 2011; 88:539-51. [PMID: 21840689 DOI: 10.1016/j.colsurfb.2011.07.044] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 07/19/2011] [Accepted: 07/19/2011] [Indexed: 10/17/2022]
Abstract
The development of new enzyme immobilization techniques that do not affect catalytic activity or conformation of a protein is an important research task in biotechnology including biosensor applications and heterogeneous reaction systems. One of the most promising approaches for controlled protein immobilization is based on the immobilized metal ion affinity chromatography (IMAC) principle originally developed for protein purification. Here we describe the current status and future perspectives of immobilization of His-tagged proteins on electrode surfaces. Recombinant proteins comprising histidine-tags or histidine rich native proteins have a strong affinity to transition metal ions. For metal ion immobilization at the electrode surface different matrices can be used such as self-assembled monolayers or conductive polymers. This specific technique allows a reversible immobilization of histidine-tagged proteins at electrodes in a defined orientation which is an important prerequisite for efficient electron transfer between the electrode and the biomolecule. Any application requiring immobilized biocatalysts on electrodes can make use of this immobilization approach, making future biosensors and biocatalytic technologies more sensitive, simpler, reusable and less expensive while only requiring mild enzyme modifications.
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Affiliation(s)
- Claudia Ley
- Biochemical Engineering Group, Karl-Winnacker-Institut, DECHEMA e.V., Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany
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Zhang J, Riskin M, Tel-Vered R, Tian H, Willner I. Optically activated uptake and release of Cu2+ or Ag+ ions by or from a photoisomerizable monolayer-modified electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1380-1386. [PMID: 21128610 DOI: 10.1021/la1040807] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Di-(N-butanoic acid-1,8-naphthalimide)-piperazine dithienylethene was covalently linked to a cysteamine monolayer associated with a Au surface to yield a photoisomerizable monolayer composed of the open or closed dithienylcyclopentene isomers (3a or 3b), respectively. Electrochemical and XPS analyses reveal that the association of metal ions to the monolayer is controlled by its photoisomerization state. We find that Cu(2+) ions reveal a high affinity for the open (3a) monolayer state, K(a) = 4.6 × 10(5) M(-1), whereas the closed monolayer state (3b) exhibits a substantially lower binding affinity for Cu(2+), K(a) = 4.1 × 10(4) M(-1). Similarly, Ag(+) ions bind strongly to the 3a monolayer state but lack binding affinity for the 3b state. The reversible photoinduced binding and dissociation of the metal ions (Cu(2+) or Ag(+)) with respect to the photoisomerizable monolayer are demonstrated, and the systems may be used for the photochemically controlled uptake and release of polluting ions. Furthermore, we demonstrate that the photoinduced reversible binding and dissociation of the metal ions to and from the photoisomerizable electrode control the wettability properties of the surface.
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Affiliation(s)
- Junji Zhang
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
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25
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Covalent immobilization of horseradish peroxidase via click chemistry and its direct electrochemistry. Talanta 2011; 83:1381-5. [DOI: 10.1016/j.talanta.2010.11.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 11/10/2010] [Accepted: 11/11/2010] [Indexed: 11/22/2022]
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26
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Renault C, Harris KD, Brett MJ, Balland V, Limoges B. Time-resolved UV-visible spectroelectrochemistry using transparent 3D-mesoporous nanocrystalline ITO electrodes. Chem Commun (Camb) 2010; 47:1863-5. [PMID: 21127815 DOI: 10.1039/c0cc04154h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient and rapid adsorption of microperoxidase 11 within a highly porous ITO thin film (200 nm) prepared by glancing angle deposition was achieved. Adsorbed redox molecules were reversibly and rapidly reduced throughout the 3D-conductive matrix in ca. 50 ms, allowing the heterogeneous electron transfer rate to be determined by derivative cyclic voltabsorptometry.
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Affiliation(s)
- Christophe Renault
- Laboratoire d'Electrochimie Moléculaire, Université Paris Diderot, UMR CNRS 7591, 15, rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France
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Hernandez K, Fernandez-Lafuente R. Control of protein immobilization: coupling immobilization and site-directed mutagenesis to improve biocatalyst or biosensor performance. Enzyme Microb Technol 2010; 48:107-22. [PMID: 22112819 DOI: 10.1016/j.enzmictec.2010.10.003] [Citation(s) in RCA: 446] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 08/26/2010] [Accepted: 10/13/2010] [Indexed: 02/04/2023]
Abstract
Mutagenesis and immobilization are usually considered to be unrelated techniques with potential applications to improve protein properties. However, there are several reports showing that the use of site-directed mutagenesis to improve enzyme properties directly, but also how enzymes are immobilized on a support, can be a powerful tool to improve the properties of immobilized biomolecules for use as biosensors or biocatalysts. Standard immobilizations are not fully random processes, but the protein orientation may be difficult to alter. Initially, most efforts using this idea were addressed towards controlling the orientation of the enzyme on the immobilization support, in many cases to facilitate electron transfer from the support to the enzyme in redox biosensors. Usually, Cys residues are used to directly immobilize the protein on a support that contains disulfide groups or that is made from gold. There are also some examples using His in the target areas of the protein and using supports modified with immobilized metal chelates and other tags (e.g., using immobilized antibodies). Furthermore, site-directed mutagenesis to control immobilization is useful for improving the activity, the stability and even the selectivity of the immobilized protein, for example, via site-directed rigidification of selected areas of the protein. Initially, only Cys and disulfide supports were employed, but other supports with higher potential to give multipoint covalent attachment are being employed (e.g., glyoxyl or epoxy-disulfide supports). The advances in support design and the deeper knowledge of the mechanisms of enzyme-support interactions have permitted exploration of the possibilities of the coupled use of site-directed mutagenesis and immobilization in a new way. This paper intends to review some of the advances and possibilities that these coupled strategies permit.
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Affiliation(s)
- Karel Hernandez
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, Campus UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
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Jung HJ, Hwang I, Kim BJ, Min H, Yu H, Lee TG, Chung TD. Selective and direct immobilization of cysteinyl biomolecules by electrochemical cleavage of azo linkage. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15087-15091. [PMID: 20809594 DOI: 10.1021/la102489k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Controlled orientation and reserved activity of biomolecules, when site-selectively immobilized in a highly integrated manner on a minimal time scale, are crucial in designing biosensors for the multiplex detection. Here, we describe a novel method for the orientation-controlled immobilization of biomolecules based on site-selective electrochemical activation of p-hydroxyazobenzene self-assembled monolayer (SAM) followed by one-step coupling of cysteinyl biomolecules. The p-aminophenol, a product of reductive cleavage of p-hydroxyazobenzene, was subsequently oxidized to yield p-quinoneimine which then conjugated with cysteinyl biomolecules through 1,4-Michael addition, thus obviating additional linker agents and the related time consumption. Using this method, we selectively activated the electrode surface and immobilized laminin peptide IKVAV, a neurite promoting motif. When we cultured hippocampal neurons on the electrode, the extended neurites were found only within the electrochemically activated area. Hence, the proposed method represents a new promising platform for the patterning of functional peptides, active proteins, and live cells.
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Affiliation(s)
- Hyun Joo Jung
- Department of Chemistry, Seoul National University, Seoul 151-747, Korea
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Doubova LM. Electron transfer through single-crystal silver electrode/n-decanthiol monolayer/NaNO3 solution interfaces. RUSS J ELECTROCHEM+ 2010. [DOI: 10.1134/s1023193510040105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Protein immobilization at gold–thiol surfaces and potential for biosensing. Anal Bioanal Chem 2010; 398:1545-64. [DOI: 10.1007/s00216-010-3708-6] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 03/29/2010] [Accepted: 03/30/2010] [Indexed: 12/14/2022]
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Zeng X, Li Z, Xiao Z, Wang Y, Liu X. Using pendant ferrocenyl group(s) as an intramolecular standard to probe the reduction of diiron hexacarbonyl model complexes for the sub-unit of [FeFe]-hydrogenase. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2009.12.023] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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