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Pattadar D, Arcidiacono A, Beery D, Hanson K, Saavedra SS. Molecular Orientation and Energy Transfer Dynamics of a Metal Oxide Bound Self-Assembled Trilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:10670-10679. [PMID: 37466635 DOI: 10.1021/acs.langmuir.3c01323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Self-assembly of molecular multilayers via metal ion linkages has become an important strategy for interfacial engineering of metalloid and metal oxide (MOx) substrates, with applications in numerous areas, including energy harvesting, catalysis, and chemical sensing. An important aspect for the rational design of these multilayers is knowledge of the molecular structure-function relationships. For example, in a multilayer composed of different chromophores in each layer, the molecular orientation of each layer, both relative to the adjacent layers and the substrate, influences the efficiency of vectorial energy and electron transfer. Here, we describe an approach using UV-vis attenuated total reflection (ATR) spectroscopy to determine the mean dipole tilt angle of chromophores in each layer in a metal ion-linked trilayer self-assembled on indium-tin oxide. To our knowledge, this is the first report demonstrating the measurement of the orientation of three different chromophores in a single assembly. The ATR approach allows the adsorption of each layer to be monitored in real-time, and any changes in the orientation of an underlying layer arising from the adsorption of an overlying layer can be detected. We also performed transient absorption spectroscopy to monitor interlayer energy transfer dynamics in order to relate structure to function. We found that near unity efficiency, sub-nanosecond energy transfer between the third and second layer was primarily dictated by the distance between the chromophores. Thus, in this case, the orientation had minimal impact at such proximity.
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Affiliation(s)
- Dhruba Pattadar
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Ashley Arcidiacono
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Drake Beery
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Kenneth Hanson
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - S Scott Saavedra
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, United States
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López-Bernabeu S, Gamero-Quijano A, Huerta F, Morallón E, Montilla F. Enhancement of the direct electron transfer to encapsulated cytochrome c by electrochemical functionalization with a conducting polymer. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kovacs N, Patko D, Orgovan N, Kurunczi S, Ramsden JJ, Vonderviszt F, Horvath R. Optical anisotropy of flagellin layers: in situ and label-free measurement of adsorbed protein orientation using OWLS. Anal Chem 2013; 85:5382-9. [PMID: 23631669 DOI: 10.1021/ac3034322] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The surface adsorption of the protein flagellin was followed in situ using optical waveguide lightmode spectroscopy (OWLS). Flagellin did not show significant adsorption on a hydrophilic waveguide, but very rapidly formed a dense monolayer on a hydrophobic (silanized) surface. The homogeneous and isotropic optical layer model, which has hitherto been generally applied in OWLS data interpretation for adsorbed protein films, failed to characterize the flagellin layer, but it could be successfully modeled as an uniaxial thin film. This anisotropic modeling revealed a significant positive birefringence in the layer, suggesting oriented protein adsorption. The adsorbed flagellin orientation was further evidenced by monitoring the surface adsorption of truncated flagellin variants, in which the terminal protein regions or the central (D3) domain were removed. Without the terminal regions the protein adsorption was much slower and the resulting films were significantly less birefringent, implying that intact flagellin adsorbs on the hydrophobic surface via its terminal regions.
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Affiliation(s)
- Noemi Kovacs
- Department of Photonics, MTA TTK MFA, Budapest, Hungary
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Horvath R, Kobzi B, Keul H, Moeller M, Kiss É. Molecular interaction of a new antibacterial polymer with a supported lipid bilayer measured by an in situ label-free optical technique. Int J Mol Sci 2013; 14:9722-36. [PMID: 23648479 PMCID: PMC3676808 DOI: 10.3390/ijms14059722] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 04/21/2013] [Accepted: 05/02/2013] [Indexed: 11/29/2022] Open
Abstract
The interaction of the antibacterial polymer-branched poly(ethylene imine) substituted with quaternary ammonium groups, PEO and alkyl chains, PEI25QI5J5A815-with a solid supported lipid bilayer was investigated using surface sensitive optical waveguide spectroscopy. The analysis of the optogeometrical parameters was extended developing a new composite layer model in which the structural and optical anisotropy of the molecular layers was taken into consideration. Following in situ the change of optical birefringence we were able to determine the composition of the lipid/polymer surface layer as well as the displacement of lipid bilayer by the antibacterial polymer without using additional labeling. Comparative assessment of the data of layer thickness and optical anisotropy helps to reveal the molecular mechanism of antibacterial effect of the polymer investigated.
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Affiliation(s)
- Robert Horvath
- MTA TTK MFA Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Budapest, Konkoly Thege u. 29-33 H-1121, Hungary; E-Mail:
| | - Balázs Kobzi
- Laboratory of Interfaces and Nanostructures, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, Budapest 112 H-1518, Hungary; E-Mails: (B.K.); (É.K.)
| | - Helmut Keul
- DWI an der RWTH Aachen e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Forckenbeckstr. 50, Aachen D-52056, Germany; E-Mail:
| | - Martin Moeller
- DWI an der RWTH Aachen e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Forckenbeckstr. 50, Aachen D-52056, Germany; E-Mail:
| | - Éva Kiss
- Laboratory of Interfaces and Nanostructures, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, Budapest 112 H-1518, Hungary; E-Mails: (B.K.); (É.K.)
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Acid Denaturation and Refolding of Cytochromecon Silica Surface. J CHIN CHEM SOC-TAIP 2012. [DOI: 10.1002/jccs.201200417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Asakawa H, Tahara S, Nakamichi M, Takehara K, Ikeno S, Linder MB, Haruyama T. The amphiphilic protein HFBII as a genetically taggable molecular carrier for the formation of a self-organized functional protein layer on a solid surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:8841-8844. [PMID: 19610665 DOI: 10.1021/la900974n] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A "drop-stamp method" has been developed for the design and fabrication of molecular interfaces. The amphiphilic protein HFBII, isolated from filamentous fungi, was employed as a genetically taggable molecular carrier for the formation of a structrally ordered layer of functional protein molecules on a solid surface. In this study, the interfacial behavior of maltose-binding protein tagged with HFBII (MBP-HFBII fusion protein) at both the air/water and water/solid interfaces was investigated. A rigid molecular layer of MBP-HFBII fusion protein was successfully formed through the drop-stamp procedure by employing an intermixed system, in which HFBII molecules are intermingled as nanospacers to prevent the intermolecular steric hindrance of the fusion protein. The results show that the drop-stamp method can be utilized in the high-throughput fabrication of structurally ordered molecular interfaces.
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Affiliation(s)
- Hitoshi Asakawa
- Department of Biological Functions and Engineering, Kyushu Institute of Technology, Kitakyushu Science and Research Park, Fukuoka 808-0196, Japan
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Balland V, Lecomte S, Limoges B. Characterization of the electron transfer of a ferrocene redox probe and a histidine-tagged hemoprotein specifically bound to a nitrilotriacetic-terminated self-assembled monolayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:6532-6542. [PMID: 19419181 DOI: 10.1021/la900062y] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the selective, controlled binding of a model redox probe, 1,1'-bis(N-imidazolylmethyl)ferrocene (Fc-Im2), and a small redox hemoprotein, histidine-tagged recombinant human neuroglobin (hNb), at the surface of metal electrodes (gold and SER-active silver) modified by a self-assembled monolayer (SAM) of a nitrilotriacetic (NTA)-terminated thiol. The resulting SAMs were characterized by cyclic voltammetry and surface-enhanced resonance Raman (SERR) spectroscopy coupled to electrochemistry. Once specifically bounded to the Ni(II)-NTA-modified gold electrode, nearly ideal cyclic voltammetric behavior with relatively fast electron-transfer (ET) communication through the SAM was determined for the Fc-Im2 redox probe. However, no direct electron transfer could be evidenced for the hNb redox protein under the same conditions. This outcome was different from the result obtained during SERR experiments coupled to electrochemistry in which a direct electrochemical conversion of hNb immobilized on a Ni(II)-NTA-modified SER-active Ag electrode was observed. The SERR spectra of the immobilized hNb was the same as the resonance Raman spectra of the protein in homogeneous solution, allowing us to conclude that the native structure of hNb was retained upon immobilization and that the direct ET was not the result of some partial or complete protein denaturation. The long-range ET rate constant (kET) through the SAM was determined by time-resolved SERR spectroscopy. A value of kET=0.12 s(-1) was obtained, which is within the predicted range of a fully nonadiabatic ET through a SAM thickness of approximately 26 A and close to the values previously determined for analogous small redox proteins at similar long-range ET distances. A SERR spectroelectrochemical titration of the immobilized hNb was also carried out, showing both an apparent standard potential (E0') negatively shifted by 100 mV compared with hNb in solution and a gentle slope in the titration curve. These results suggest a range of chemical environments in the surroundings of the redox protein and a variety of interactions with the NTA-terminated SAM. The influence of protein immobilization on E0' is discussed together with the long-range ET rate constant and molecular orientation of the surface-immobilized hNb.
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Affiliation(s)
- Véronique Balland
- Laboratoire d'Electrochimie Moléculaire, Université Paris Diderot, UMR CNRS 7591, Paris Cedex 13, France.
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Beam BM, Armstrong NR, Mendes SB. An electroactive fiber optic chip for spectroelectrochemical characterization of ultra-thin redox-active films. Analyst 2009; 134:454-9. [DOI: 10.1039/b814338b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gorshkova II, Svitel J, Razjouyan F, Schuck P. Bayesian analysis of heterogeneity in the distribution of binding properties of immobilized surface sites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11577-86. [PMID: 18816013 PMCID: PMC2574969 DOI: 10.1021/la801186w] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Once a homogeneous ensemble of a protein ligand is taken from solution and immobilized to a surface, for many reasons the resulting ensemble of surface binding sites to soluble analytes may be heterogeneous. For example, this can be due to the intrinsic surface roughness causing variations in the local microenvironment, nonuniform density distribution of polymeric linkers, or nonuniform chemical attachment producing different protein orientations and conformations. We previously described a computational method for determining the distribution of affinity and rate constants of surface sites from analysis of experimental surface binding data. It fully exploits the high signal/noise ratio and reproducibility provided by optical biosensor technology, such as surface plasmon resonance. Since the computational analysis is ill conditioned, the previous approach used a regularization strategy assuming a priori all binding parameters to be equally likely, resulting in the broadest possible parameter distribution consistent with the experimental data. We now extended this method in a Bayesian approach to incorporate the opposite assumption, i.e., that the surface sites a priori are expected to be uniform (as one would expect in free solution). This results in a distribution of binding parameters as close to monodispersity as possible given the experimental data. Using several model protein systems immobilized on a carboxymethyl dextran surface and probed with surface plasmon resonance, we show microheterogeneity of the surface sites in addition to broad populations of significantly altered affinity. The distributions obtained are highly reproducible. Immobilization conditions and the total surface density of immobilized sites can have a substantial impact on the functional distribution of the binding sites.
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Affiliation(s)
- Inna I. Gorshkova
- Dynamics of Macromolecular Assembly Section, Laboratory of Bioengineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892
| | | | - Faezeh Razjouyan
- Dynamics of Macromolecular Assembly Section, Laboratory of Bioengineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892
| | - Peter Schuck
- Dynamics of Macromolecular Assembly Section, Laboratory of Bioengineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892
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Jacobsen K, Risse T. On the origin of the polar order of T4 lysozyme on planar model surfaces. J Phys Chem B 2008; 112:967-72. [PMID: 18171040 DOI: 10.1021/jp075375m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Site directed spin labeling is used to investigate the origin of the macroscopic alignment of T4 lysozyme vectorially tethered to planar biomimetic surfaces. T4 lysozyme was adsorbed to a quartz-supported dioleoylphosphatidylcholine (DOPC) bilayer by selective binding of the histidine-tagged protein to functionalized headgroups (1,2-dioleoyl-sn-glycero-3-[[N(5-amino-1-carboxypentyl)iminodiacetic acid]succinyl], DOGS NTA) of the bilayer. This results in a polar oriented ensemble of proteins on the surface, which gives rise to angular-dependent electron paramagnetic resonance (EPR) spectra. In order to reveal the mechanism of the protein alignment, the influence of protein coverage on the order of the molecules was addressed. Along the lines described previously for a full monolayer (Jacobsen, et al. Biophys. J. 2005, 88, 4351), the polar orientation of the molecules was inferred from an analysis of the EPR line shape using the stochastic Liouville equation (SLE) approach developed by Freed and co-workers. The simulations reveal that the orientation of the protein is strongly determined by lateral protein-protein interactions. In comparison to the lipid bilayer, a fusion protein of T4 lysozyme (T4L) with Annexin XII was investigated, where the two-dimensional crystallization of Annexin XII on a dioleoylphosphatidylserine (DOPS) bilayer provides a surface layer of regularly anchored T4L molecules. For this system, it is found that the interaction between T4L and Annexin plays a more important role for understanding the structure in the adsorbed state.
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Affiliation(s)
- Kerstin Jacobsen
- Fritz Haber Institute of Max Planck Society, Department of Chemical Physics, Faradayweg 4-6, 14195 Berlin, Germany
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Sagara T, Kubo Y, Hiraishi K. Estimation of the Orientation of Heme in Cytochrome c Immobilized on a Carboxylate-Terminated Alkanethiol Monolayer on a Au Electrode by the Use of Electroreflectance Spectroscopy with Polarized Light Incidence. J Phys Chem B 2006; 110:16550-8. [PMID: 16913789 DOI: 10.1021/jp0629240] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electroreflectance (ER) spectroscopy was used for the estimation of the orientation of heme in a horse heart cytochrome c molecule immobilized on a self-assembled monolayer of 11-mercaptoundecanoic acid on both polycrystalline gold (Au) and single crystalline Au(111) electrodes. The intensity ratio of the ER signal of p-polarized incident light against s-polarized incident light as a function of the incident angle of the light was analyzed in two ways: a doubly degenerate transition for the Soret absorption band of the heme was assumed in one, and the anisotropy of the two orthogonal transitions was taken into account in the other. The doubly degenerate model failed in the expression of the experimental data, pointing to the existence of the anisotropy. Two orthogonal in-plane linear electric dipoles with different magnitudes were assumed to be responsible for the Soret band absorption in a new analysis procedure. This enabled us to fit the experimental data closely to the simulated data. The result revealed that the heme plane is near-vertical to the electrode surface. The need of clarification of the anisotropic heme transition was invoked.
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Affiliation(s)
- Takamasa Sagara
- Department of Applied Chemistry, Nagasaki University, Bunkyo 1-14, Nagasaki 852-8521, Japan.
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12
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Sagara T, Nagatani H. ELECTROCHEMISTRY 2006; 74:512-517. [DOI: 10.5796/electrochemistry.74.512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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