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A Procedure for Estimating the Absolute Potential Difference Across Metal|Water Interfaces: a Reassessment. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Dziubak D, Puszko AK, Bachurska P, Pułka-Ziach K, Sęk S. Oligourea molecular lifter triggered by electric field. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2021.139634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Guidelli R, Becucci L. Functional activity of peptide ion channels in tethered bilayer lipid membranes: Review. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Rolando Guidelli
- Department of Chemistry University of Florence Sesto Fiorentino Firenze Italy
| | - Lucia Becucci
- Ministero dell'Istruzione Scuola Media “Guglielmo Marconi” San Giovanni Valdarno Arezzo Italy
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Prieto Dapena F, Su Z, Alvarez Malmagro J, Rueda M, Lipkowski J. Mixed monolayer of a nucleolipid and a phospholipid has improved properties for spectroelectrochemical sensing of complementary nucleobases. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Electrostatics affects formation of Watson-Crick complex between DNA bases in monolayers of nucleolipids deposited at a gold electrode surface. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138816] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Why Do Tethered-Bilayer Lipid Membranes Suit for Functional Membrane Protein Reincorporation? APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11114876] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Membrane proteins (MPs) are essential for cellular functions. Understanding the functions of MPs is crucial as they constitute an important class of drug targets. However, MPs are a challenging class of biomolecules to analyze because they cannot be studied outside their native environment. Their structure, function and activity are highly dependent on the local lipid environment, and these properties are compromised when the protein does not reside in the cell membrane. Mammalian cell membranes are complex and composed of different lipid species. Model membranes have been developed to provide an adequate environment to envisage MP reconstitution. Among them, tethered-Bilayer Lipid Membranes (tBLMs) appear as the best model because they allow the lipid bilayer to be decoupled from the support. Thus, they provide a sufficient aqueous space to envisage the proper accommodation of large extra-membranous domains of MPs, extending outside. Additionally, as the bilayer remains attached to tethers covalently fixed to the solid support, they can be investigated by a wide variety of surface-sensitive analytical techniques. This review provides an overview of the different approaches developed over the last two decades to achieve sophisticated tBLMs, with a more and more complex lipid composition and adapted for functional MP reconstitution.
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Pawłowski J, Dziubak D, Sęk S. Potential-driven changes in hydration of chitosan-derived molecular films on gold electrodes. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.07.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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8
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Mechanisms of alamethicin ion channel inhibition by amiloride in zwitterionic tethered lipid bilayers. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113281] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Alvarez-Malmagro J, Su Z, Leitch JJ, Prieto F, Rueda M, Lipkowski J. Electric-Field-Driven Molecular Recognition Reactions of Guanine with 1,2-Dipalmitoyl- sn- glycero-3-cytidine Monolayers Deposited on Gold Electrodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9297-9307. [PMID: 31274320 DOI: 10.1021/acs.langmuir.9b01238] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Monolayers of 1,2-dipalmitoyl-sn-glycero-3-cytidine were incubated with guanine in a 0.1 M NaF electrolyte at the surface of a Langmuir trough and transferred to gold (111) electrodes using the Langmuir-Schaefer technique. Chronocoulometry and photon polarization modulation infrared reflection absorption spectroscopy were employed to investigate the influence of the static electric field on the orientation and conformation of the cytidine nucleolipid molecules on the metal surface in the presence of guanine and to monitor the molecular recognition of guanine with the cytosine moiety. When the monolayer is exposed to guanine solutions, the cytosine moiety binds to the guanine residue in either a Watson-Crick complex at positively charged electrode surfaces or a noncomplexed state at negative surface charges. The positive electrostatic field causes the cytosine moiety and the cytosine-guanine complex to adopt a nearly parallel orientation with respect to the plane of the monolayer with a measured tilt angle of ∼10°. The parallel orientation is stabilized by the interactions between the permanent dipole of the cytosine moiety or the Watson-Crick complex and the static electric field. At negative charge densities, the tilt of the cytosine moiety increases by ∼15-20°, destabilizing the complex. Our results demonstrate that the static electric field has an influence on the molecular recognition reactions between nucleoside base pairs at the metal-solution interface and can be controlled by altering the surface charge at the metal.
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Affiliation(s)
- Julia Alvarez-Malmagro
- Department of Physical Chemistry , University of Seville , C/Profesor García González no. 2 , 41012 Seville , Spain
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - ZhangFei Su
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - J Jay Leitch
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - Francisco Prieto
- Department of Physical Chemistry , University of Seville , C/Profesor García González no. 2 , 41012 Seville , Spain
| | - Manuela Rueda
- Department of Physical Chemistry , University of Seville , C/Profesor García González no. 2 , 41012 Seville , Spain
| | - Jacek Lipkowski
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
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Priske G, Su Z, Abbasi F, Lipkowski J, Auzanneau FI. Synthesis and electrochemical characterization of 4-thio pseudo-glycolipids as candidate tethers for lipid bilayer models. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.12.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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11
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Alvarez-Malmagro J, Su Z, Jay Leitch J, Prieto F, Rueda M, Lipkowski J. Spectroelectrochemical Characterization of 1,2-Dipalmitoyl- sn-glycero-3-cytidine Diphosphate Nucleolipid Monolayer Supported on Gold (111) Electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:901-910. [PMID: 30605613 DOI: 10.1021/acs.langmuir.8b03674] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The effect of the electrode potential on the orientation and conformation of the 1,2-dipalmitoyl- sn-glycero-3-cytidine monolayer deposited on a gold (111) electrode surface was described. The potential of zero free charge ( Epzc) for the monolayer-covered electrode was determined to be -0.2 V vs SCE. The differential capacitance and charge density data indicated that the monolayer is stable at the electrode surface when ( E - Epzc) > 0.0 V. At negative rational potentials, a progressive detachment (electrodewetting) of the monolayer occurs. The monolayer is fully detached from the electrode surface at ( E - Epzc) < -0.6 V. The conformation and orientation of the acyl chains and the orientation of the cytosine moiety were determined with the help of photon polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). The IR measurements demonstrate that the acyl chains are predominantly in the gel phase in the adsorbed state and tilted at an angle of ∼30° with respect to the electrode surface normal. The tilt angle of the acyl chains increases when the film is detached from the gold surface, indicating that the monolayer becomes more disordered. At ( E - Epzc) > 0.0 V, the plane of the cytosine moiety assumes a small angle of ∼20° with respect to the surface. At negative potentials, the tilt angle of the cytosine fragment increases and rotates. With the help of DFT calculations, these changes were explained by the repulsion of the positive pole of the cytosine permanent dipole moment by the positively charged gold surface and its attraction to the metal surface at negative electrode potentials. This work provides unique information for the future development of sensors based on the molecular recognition of nucleoside targets.
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Affiliation(s)
- Julia Alvarez-Malmagro
- Department of Physical Chemistry , University of Seville , C/Professor García González no. 2, 41012 Seville , Spain
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - ZhangFei Su
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - J Jay Leitch
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
| | - Francisco Prieto
- Department of Physical Chemistry , University of Seville , C/Professor García González no. 2, 41012 Seville , Spain
| | - Manuela Rueda
- Department of Physical Chemistry , University of Seville , C/Professor García González no. 2, 41012 Seville , Spain
| | - Jacek Lipkowski
- Department of Chemistry , University of Guelph , Guelph , Ontario , Canada N1G 2W1
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12
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Salvarezza R, Carro P. The electrochemical stability of thiols on gold surfaces. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.10.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Becucci L, Aloisi G, Scaloni A, Guidelli R. Channel-forming activity of lactophoricins I and II in mercury-supported tethered bilayer lipid membranes. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.08.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Determining the parameters governing the electrochemical stability of thiols and disulfides self-assembled monolayer on gold electrodes in physiological medium. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.07.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Becucci L, Aloisi G, Scaloni A, Caira S, Guidelli R. On the interaction of the highly charged peptides casocidins with biomimetic membranes. Bioelectrochemistry 2018; 123:1-8. [PMID: 29715585 DOI: 10.1016/j.bioelechem.2018.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 04/12/2018] [Accepted: 04/17/2018] [Indexed: 11/16/2022]
Abstract
Casocidin I and II (CI and CII) are structurally related antimicrobial peptides made of 39 and 31 amino acids, respectively, which derive from natural proteolytic processing of αs2-casein and adopt an ordered α-helical structure in biomimetic membranes. Their putative membrane-permeabilizing activity was investigated at Hg-supported self-assembled monolayers (SAMs) and at tethered bilayer lipid membranes (tBLMs); the latter consisted of a monolayer of 2,3,di-O-phytanyl-sn-glycerol-1-tetraethylene-glycol-d,l-α lipoic acid ester thiolipid (DPTL), with a dioleoylphosphatidylcholine (DOPC) or dioleoylphosphatidylserine (DOPS) monolayer on top of it. Interaction of CI and CII with these biomimetic membranes was studied by four electrochemical techniques at pH 3, 5.4 and 6.8. Peptide incorporation in tBLMs was attempted via scans of electrochemical impedance spectra. Experiments demonstrated that CI and CII penetrate SAMs as well as the distal DOPC monolayer of DPTL/DOPC tBLMs, but not the proximal phytanyl monolayer, with the only exception of CII at pH 5.4. Conversely, CII permeabilized DPTL/DOPS tBLMs to a moderate extent at all investigated pH values by forming holes across the membrane, but not ion channels. Structural distribution of charged residues seemed to prevent CII from having a hydrophobic side of the α-helix capable of stabilizing a regular ion channel in the lipid matrix.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy; 1st Grade Secondary School "Giuseppe Pescetti", Via Gramsci 390, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Giovanni Aloisi
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
| | - Andrea Scaloni
- Proteomics & Mass Spectrometry Laboratory, ISPAAM-National Research Council, 80147 Naples, Italy
| | - Simonetta Caira
- Proteomics & Mass Spectrometry Laboratory, ISPAAM-National Research Council, 80147 Naples, Italy
| | - Rolando Guidelli
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
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Becucci L, Aloisi G, Papini AM, Guidelli R. Channel-forming activity of nisin in two mercury-supported biomimetic membranes. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.11.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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EIS and PM-IRRAS studies of alamethicin ion channels in a tethered lipid bilayer. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Cometto FP, Luo Z, Zhao S, Olmos-Asar JA, Mariscal MM, Ong Q, Kern K, Stellacci F, Lingenfelder M. The van der Waals Interactions of n
-Alkanethiol-Covered Surfaces: From Planar to Curved Surfaces. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708735] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fernando P. Cometto
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique; École Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- Departamento Fisicoquímica y de Química Teórica y Computacional; Facultad de Ciencias Químicas; Universidad Nacional de Córdoba-INFIQC; Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET; Argentina
| | - Zhi Luo
- Institute of Materials; École Polytechnique Fédérale de Lausanne; Lausanne 1015 Switzerland
| | - Shun Zhao
- Institute of Materials; École Polytechnique Fédérale de Lausanne; Lausanne 1015 Switzerland
| | - Jimena A. Olmos-Asar
- Departamento Fisicoquímica y de Química Teórica y Computacional; Facultad de Ciencias Químicas; Universidad Nacional de Córdoba-INFIQC; Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET; Argentina
| | - Marcelo M. Mariscal
- Departamento Fisicoquímica y de Química Teórica y Computacional; Facultad de Ciencias Químicas; Universidad Nacional de Córdoba-INFIQC; Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET; Argentina
| | - Quy Ong
- Institute of Materials; École Polytechnique Fédérale de Lausanne; Lausanne 1015 Switzerland
| | - Klaus Kern
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique; École Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- Max-Planck-Institut für Festkörperforschung; 70569 Stuttgart Germany
| | - Francesco Stellacci
- Institute of Materials; École Polytechnique Fédérale de Lausanne; Lausanne 1015 Switzerland
| | - Magalí Lingenfelder
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique; École Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
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Cometto FP, Luo Z, Zhao S, Olmos-Asar JA, Mariscal MM, Ong Q, Kern K, Stellacci F, Lingenfelder M. The van der Waals Interactions of n-Alkanethiol-Covered Surfaces: From Planar to Curved Surfaces. Angew Chem Int Ed Engl 2017; 56:16526-16530. [PMID: 29065250 PMCID: PMC5767748 DOI: 10.1002/anie.201708735] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/16/2017] [Indexed: 11/23/2022]
Abstract
The van der Waals (vdW) interactions of n‐alkanethiols (ATs) adsorbed on planar Au(111) and Au(100) surfaces and curved Au nanoparticles of different diameters are reported. By means of electrochemical measurements and molecular dynamic calculations, the increase in the average geometrical curvature of the surface influences the global interactions, that is, decreasing vdW interactions between neighboring molecules. Small NPs do not present the same electrochemical behavior as planar surfaces. The transition between nanoparticle to flat surface electrochemical response is estimated to occur at a circa 13–20 nm diameter range.
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Affiliation(s)
- Fernando P Cometto
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.,Departamento Fisicoquímica y de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-INFIQC, Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET, Argentina
| | - Zhi Luo
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Shun Zhao
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Jimena A Olmos-Asar
- Departamento Fisicoquímica y de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-INFIQC, Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET, Argentina
| | - Marcelo M Mariscal
- Departamento Fisicoquímica y de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-INFIQC, Instituto de Investigaciones en Fisicoquímica de Córdoba, CONICET, Argentina
| | - Quy Ong
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Klaus Kern
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.,Max-Planck-Institut für Festkörperforschung, 70569, Stuttgart, Germany
| | - Francesco Stellacci
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Magalí Lingenfelder
- Max Planck-EPFL Laboratory for Molecular Nanoscience, and Institut de Physique, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
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20
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Gramicidin A ion channel formation in model phospholipid bilayers tethered to gold (111) electrode surfaces. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.059] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Seenath R, Leitch JJ, Su Z, Faragher RJ, Schwan AL, Lipkowski J. Measurements of surface concentration and charge number per adsorbed molecule for a thiolipid monolayer tethered to the Au(111) surface by a long hydrophilic chain. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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22
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Becucci L, Guidelli R. What Ion Flow along Ion Channels Can Tell us about Their Functional Activity. MEMBRANES 2016; 6:membranes6040053. [PMID: 27983579 PMCID: PMC5192409 DOI: 10.3390/membranes6040053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 11/25/2016] [Accepted: 12/01/2016] [Indexed: 11/16/2022]
Abstract
The functional activity of channel-forming peptides and proteins is most directly verified by monitoring the flow of physiologically relevant inorganic ions, such as Na⁺, K⁺ and Cl-, along the ion channels. Electrical current measurements across bilayer lipid membranes (BLMs) interposed between two aqueous solutions have been widely employed to this end and are still extensively used. However, a major drawback of BLMs is their fragility, high sensitivity toward vibrations and mechanical shocks, and low resistance to electric fields. To overcome this problem, metal-supported tethered BLMs (tBLMs) have been devised, where the BLM is anchored to the metal via a hydrophilic spacer that replaces and mimics the water phase on the metal side. However, only mercury-supported tBLMs can measure and regulate the flow of the above inorganic ions, thanks to mercury liquid state and high hydrogen overpotential. This review summarizes the main results achieved by BLMs incorporating voltage-gated channel-forming peptides, interpreting them on the basis of a kinetic mechanism of nucleation and growth. Hg-supported tBLMs are then described, and their potential for the investigation of voltage-gated and ohmic channels is illustrated by the use of different electrochemical techniques.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, Sesto Fiorentino 50019, Italy.
| | - Rolando Guidelli
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, Sesto Fiorentino 50019, Italy.
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Maccarini M, Watkins EB, Stidder B, Alcaraz JP, Cornell BA, Martin DK. Nanostructural determination of a lipid bilayer tethered to a gold substrate. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:123. [PMID: 27966072 DOI: 10.1140/epje/i2016-16123-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/23/2016] [Indexed: 06/06/2023]
Abstract
Tethered lipid bilayer membranes (tBLM) are planar membranes composed of free lipids and molecules tethered to a solid planar substrate providing a useful model of biological membranes for a wide range of biophysical studies and biotechnological applications. The properties of the tBLM depend on the free lipids and on the chemistry of the tethering molecules. We present a nanoscale characterization of a tBLM composed of deuterated 1,2-dimyristoyl-sn-glycero-3-phosphocholine (d-DMPC) free lipids, benzyl disulfide undecaethylene glycol phytanol (DLP) tethering molecules, and benzyl disulfiide tetraethylene glycol polar spacer molecules (PSM) used to control the areal density of tethering molecules through coadsorption. The use of selected isotopic substitution provides a way to distinguish the conformation and location of the tethered lipids from the free lipids and to elucidate how the two components influence the structure of the tBLM. These findings provide useful information to optimise the insertion of transmembrane proteins into the tethered bilayer system.
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Affiliation(s)
- Marco Maccarini
- TIMC/IMAG, Université Grenoble Alpes, (UMR 5525), Grenoble, France.
| | - Erik B Watkins
- Los Alamos National Laboratory, 87545, Los Alamos, NM, USA
| | - Barry Stidder
- TIMC/IMAG, Université Grenoble Alpes, (UMR 5525), Grenoble, France
| | | | - Bruce A Cornell
- SDx Tethered Membranes Pty Ltd u6 30-32, Barcoo Street, 2069, Roseville, NSW, Australia
| | - Donald K Martin
- TIMC/IMAG, Université Grenoble Alpes, (UMR 5525), Grenoble, France
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Gobbo P, Antonello S, Guryanov I, Polo F, Soldà A, Zen F, Maran F. Dipole Moment Effect on the Electrochemical Desorption of Self-Assembled Monolayers of 310-Helicogenic Peptides on Gold. ChemElectroChem 2016. [DOI: 10.1002/celc.201600573] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Pierangelo Gobbo
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Sabrina Antonello
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
| | - Ivan Guryanov
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
- Institute of Chemistry; St. Petersburg State University, 26 Universitetskij Pr.; 198504 Saint-Petersburg Russia
| | - Federico Polo
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
- National Cancer Institute-Centro di Riferimento Oncologico; Via Franco Gallini 2 33081 Aviano Italy
| | - Alice Soldà
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
- Department of Chemistry; University of Bologna; Via Selmi 2 40126 Bologna Italy
| | - Federico Zen
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
- School of Chemistry; Trinity College Dublin, College Green; Dublin 2 Ireland
| | - Flavio Maran
- Department of Chemistry; University of Padova; Via Marzolo 1 35131 Padova Italy
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Becucci L, Aloisi G, Guidelli R. When and how the melittin ion channel exhibits ohmic behavior. Bioelectrochemistry 2016; 113:51-59. [PMID: 27732908 DOI: 10.1016/j.bioelechem.2016.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 10/03/2016] [Accepted: 10/04/2016] [Indexed: 11/15/2022]
Abstract
Melittin exhibits an ohmic behavior in a lipid bilayer having a DOPC distal leaflet and interposed between a 2.25nm tetraethyleneoxy chain tethered to a mercury drop and an aqueous solution. This behavior is induced in a pH6.8 buffer solution of 0.8μg/mL melittin by a pretreatment consisting of series of electrochemical impedance spectroscopy measurements at bias potentials varied by 50mV steps over a transmembrane potential range from about +250 to -250mV. This metastable ohmic behavior remains unchanged for hours, even after acidifying the solution to pH3. The midpoint potential E1/2 between the positive and negative peaks of the resulting cyclic voltammogram is almost coincident with that of the ohmic channels gramicidin and syringopeptin 25A and shifts by the same amount toward more positive potentials with a pH decrease from 6.8 to 3. This common cyclic voltammetry behavior is explained by a tilt of the DOPC polar heads around the channel mouth of these three peptides and is simulated by a modelistic approach. The ohmic behavior of melittin is explained by the persistence of the peptide orientation initially assumed at trans-negative potentials even after application of trans-positive ones, at sufficiently high peptide-to-lipid molar ratios.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Giovanni Aloisi
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
| | - Rolando Guidelli
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
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Positively charged supported lipid bilayer formation on gold surfaces for neuronal cell culture. Biointerphases 2016; 11:021003. [DOI: 10.1116/1.4945306] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Can gramicidin ion channel affect the dipole potential of neighboring phospholipid headgroups? Bioelectrochemistry 2015; 106:343-52. [DOI: 10.1016/j.bioelechem.2015.06.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 05/14/2015] [Accepted: 06/21/2015] [Indexed: 11/17/2022]
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Becucci L, Benci S, Nuti F, Real-Fernandez F, Vaezi Z, Stella L, Venanzi M, Rovero P, Papini AM. Interaction Study of Phospholipid Membranes with an N-Glucosylated β-Turn Peptide Structure Detecting Autoantibodies Biomarkers of Multiple Sclerosis. MEMBRANES 2015; 5:576-96. [PMID: 26437433 PMCID: PMC4704000 DOI: 10.3390/membranes5040576] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 09/24/2015] [Indexed: 11/18/2022]
Abstract
The interaction of lipid environments with the type I’ β-turn peptide structure called CSF114 and its N-glucosylated form CSF114(Glc), previously developed as a synthetic antigenic probe recognizing specific autoantibodies in a subpopulation of multiple sclerosis patients’ serum, was investigated by fluorescence spectroscopy and electrochemical experiments using large unilamellar vesicles, mercury supported lipid self-assembled monolayers (SAMs) and tethered bilayer lipid membranes (tBLMs). The synthetic antigenic probe N-glucosylated peptide CSF114(Glc) and its unglucosylated form interact with the polar heads of lipid SAMs of dioleoylphosphatidylcholine at nonzero transmembrane potentials, probably establishing a dual electrostatic interaction of the trimethylammonium and phosphate groups of the phosphatidylcholine polar head with the Glu5 and His9 residues on the opposite ends of the CSF114(Glc) β-turn encompassing residues 6-9. His9 protonation at pH 7 eliminates this dual interaction. CSF114(Glc) is adsorbed on top of SAMs of mixtures of dioleoylphosphatidylcholine with sphingomyelin, an important component of myelin, whose proteins are hypothesized to undergo an aberrant N-glucosylation triggering the autoimmune response. Incorporation of the type I’ β-turn peptide structure CSF114 into lipid SAMs by potential scans of electrochemical impedance spectroscopy induces defects causing a slight permeabilization toward cadmium ions. The N-glucopeptide CSF114(Glc) does not affect tBLMs to a detectable extent.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy.
- Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
| | - Stefano Benci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Francesca Nuti
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Feliciana Real-Fernandez
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Zahra Vaezi
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Lorenzo Stella
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Mariano Venanzi
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Paolo Rovero
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Department of Neurosciences, Psychology, Drug Research and Child Health-Section of Pharmaceutical Sciences and Nutraceutics, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Anna Maria Papini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- PeptLab@UCP Platform and Laboratory of Chemical Biology EA4505, University of Cergy-Pontoise, 5 mail Gay-Lussac, 95031 Cergy-Pontoise CEDEX, France
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Becucci L, Tramonti V, Fiore A, Fogliano V, Scaloni A, Guidelli R. Channel-forming activity of syringomycin E in two mercury-supported biomimetic membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:932-41. [DOI: 10.1016/j.bbamem.2014.12.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 12/05/2014] [Accepted: 12/08/2014] [Indexed: 10/24/2022]
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Matyszewska D, Bilewicz R. Interactions of daunorubicin with Langmuir–Blodgett thiolipid monolayers. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.01.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Marquês JT, Viana AS, de Almeida RFM. A biomimetic platform to study the interactions of bioelectroactive molecules with lipid nanodomains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12627-12637. [PMID: 25267380 DOI: 10.1021/la503086a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, we developed a biomimetic platform where the study of membrane associated redox processes and high-resolution imaging of lipid nanodomains can be both performed, based on a new functional gold modification, l-cysteine self-assembled monolayer. This monolayer proved to be ideal for the preparation of defect-free planar supported lipid bilayers (SLBs) where nanodomains with height difference of ∼1.5 nm are clearly resolved by atomic force microscopy. Single and multicomponent lipid compositions were used, leading to the formation of different phases and domains mimicking the lateral organization of cellular membranes, and in all cases stable and continuous bilayers were obtained. These platforms were tested toward the interaction with bioelectroactive molecules, the antioxidant quercetin, and the hormone epinephrine. Despite the weak interaction detected between epinephrine and lipid bilayers, our biomimetic interface was able to sense the redox process of membrane-bound epinephrine, obtain its surface concentration (9.36 × 10(-11) mol/cm(2) for a fluid bilayer), and estimate a mole fraction membrane/water partition coefficient (Kp) from cyclic voltammetric measurements (1.13 × 10(4) for a fluid phase membrane). This Kp could be used to quantitatively describe the minute changes observed in the photophysical properties of epinephrine intrinsic fluorescence upon its interaction with liposome suspensions. Moreover, we showed that the lipid membrane stabilizes epinephrine structure, preventing its oxidation, which occurs in neutral aqueous solution, and that epinephrine partition and mobility in membranes depends on lipid phase, expanding our knowledge on hormone membrane interactions.
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Affiliation(s)
- Joaquim T Marquês
- Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa , Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal
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Smeazzetto S, Sacconi A, Schwan AL, Margheri G, Tadini-Buoninsegni F. Binding of a monoclonal antibody to the phospholamban cytoplasmic domain interferes with the channel activity of phospholamban reconstituted in a tethered bilayer lipid membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10384-10388. [PMID: 25121716 DOI: 10.1021/la501660u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Phospholamban (PLN), a membrane protein present in the sarcoplasmic reticulum of cardiac myocytes, is a crucial regulator of cardiac function. It is known that PLN appears as a monomer and as a pentamer. However, the role of the PLN pentamer and its ability to generate an ion channel are a matter of debate. To address this issue we employed an experimental approach that combines electrochemical impedance spectroscopy and surface plasmon resonance measurements. In particular, we investigated the channel activity of wild-type PLN reconstituted in a tethered bilayer lipid membrane (tBLM) on a gold surface. Our results indicate that reconstituted PLN can generate ion-conducting channels in a tBLM. Experiments with a PLN monoclonal antibody support an oriented incorporation of PLN in the tBLM. We show that the binding of the antibody to the PLN cytoplasmic domain interferes with PLN channel activity.
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Affiliation(s)
- Serena Smeazzetto
- Department of Chemistry "Ugo Schiff", University of Florence , 50019 Sesto Fiorentino, Italy
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Tethered bilayer lipid membranes (tBLMs): interest and applications for biological membrane investigations. Biochimie 2014; 107 Pt A:135-42. [PMID: 24998327 DOI: 10.1016/j.biochi.2014.06.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 06/25/2014] [Indexed: 01/19/2023]
Abstract
Biological membranes play a central role in the biology of the cell. They are not only the hydrophobic barrier allowing separation between two water soluble compartments but also a supra-molecular entity that has vital structural functions. Notably, they are involved in many exchange processes between the outside and inside cellular spaces. Accounting for the complexity of cell membranes, reliable models are needed to acquire current knowledge of the molecular processes occurring in membranes. To simplify the investigation of lipid/protein interactions, the use of biomimetic membranes is an approach that allows manipulation of the lipid composition of specific domains and/or the protein composition, and the evaluation of the reciprocal effects. Since the middle of the 80's, lipid bilayer membranes have been constantly developed as models of biological membranes with the ultimate goal to reincorporate membrane proteins for their functional investigation. In this review, after a brief description of the planar lipid bilayers as biomimetic membrane models, we will focus on the construction of the tethered Bilayer Lipid Membranes, the most promising model for efficient membrane protein reconstitution and investigation of molecular processes occurring in cell membranes.
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Singh S, Su Z, Grossutti M, Auzanneau FI. Attempts to prepare tethered bilayer lipid membranes using synthetic thioglycolipid anchors: synthesis of 6″-thiotrisaccharide glycolipid analogues and applications. Carbohydr Res 2014; 390:50-8. [PMID: 24704433 DOI: 10.1016/j.carres.2014.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 03/07/2014] [Accepted: 03/08/2014] [Indexed: 11/29/2022]
Abstract
The synthesis of the three 6″-deoxy-6″-thio glycolipid analogues β-d-Gal-(1→6)-β-d-Gal-(1→4)-β-d-Glu-(1→OCH2)-[1,2,3]-triazole-1-dodecane, β-d-Gal-(1→4)-β-d-Glu-(1→4)-β-d-Glu-(1→OCH2)-[1,2,3]-triazole-1-dodecane and β-d-Gal-(1→4)-β-d-Glu-(1→4)-β-d-Glu-(1→OCH2)-[1,2,3]-triazole-1-octadecane is presented. Glycosylation at position O-4' of a propargyl cellobioside glycosyl acceptor and position O-6' of a propargyl lactoside glycosyl acceptor with a 6-deoxy-6-thio galactosyl donor gave rise to two unique trisaccharides that in turn underwent copper-catalyzed azide-alkyne cycloadditions with either 1-azidododecane or 1-azidooctadecane. The potential for each of these analogues to function as tethers of lipid bilayers to Au(111) surface was assessed by differential capacitance experiments. A monolayer of the previously described monosaccharide 1-octadecane-4-(6-thio-β-d-galacto-pyranosyloxymethyl)-[1,2,3]-triazole either self-assembled or prepared by Langmuir-Blodgett (LB) transfer was found to support an outer leaflet monolayer (DMPC/cholesterol, 70:30) deposited by Langmuir-Schaefer (LS) touch. The bilayers obtained with this monosaccharide analogue had minimum differential capacitances of 1.0 and 0.9μF/cm(2) when the inner monolayer was prepared by self-assembly and LS touch, respectively. Attempts to produce bilayers using the trisaccharides synthesized here were unsuccessful; we are attributing these unsuccessful results mostly to the high water solubility of trisaccharides combined with the relatively short length of the hydrocarbon chains used in this study.
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Affiliation(s)
- Serena Singh
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Zhangfei Su
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Michael Grossutti
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
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36
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Lipid bilayers supported on bare and modified gold – Formation, characterization and relevance of lipid rafts. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.07.117] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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37
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Electrochemical studies of self-assembled monolayers composed of various phenylboronic acid derivatives. Talanta 2014; 119:5-10. [DOI: 10.1016/j.talanta.2013.10.059] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 10/22/2013] [Accepted: 10/27/2013] [Indexed: 11/17/2022]
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Kaplan JM, Shang J, Gobbo P, Antonello S, Armelao L, Chatare V, Ratner DM, Andrade RB, Maran F. Conformationally constrained functional peptide monolayers for the controlled display of bioactive carbohydrate ligands. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8187-8192. [PMID: 23782319 PMCID: PMC3770261 DOI: 10.1021/la4008894] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this study, we employed thiolated peptides of the conformationally constrained, strongly helicogenic α-aminoisobutyric acid (Aib) residue to prepare self-assembled monolayers (SAMs) on gold surfaces. Electrochemistry and infrared reflection absorption spectroscopy support the formation of very well packed Aib-peptide SAMs. The immobilized peptides retain their helical structure, and the resulting SAMs are stabilized by a network of intermolecular H bonds involving the NH groups adjacent to the Au surface. Binary SAMs containing a synthetically defined glycosylated mannose-functionalized Aib-peptide as the second component display similar features, thereby providing reproducible substrates suitable for the controlled display of bioactive carbohydrate ligands. The efficiency of such Aib-based SAMs as a biomolecular recognition platform was evidenced by examining the mannose-concanavalin A interaction via surface plasmon resonance biosensing.
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Affiliation(s)
- Justin M. Kaplan
- Department of Chemistry, Temple University, Philadelphia, PA, USA
| | - Jing Shang
- Department of Bioengineering, University of Washington, WA, USA
| | | | | | - Lidia Armelao
- IENI-CNR c/o Department of Chemistry, University of Padova, Padova, Italy
| | - Vijay Chatare
- Department of Chemistry, Temple University, Philadelphia, PA, USA
| | | | | | - Flavio Maran
- Department of Chemistry, Temple University, Philadelphia, PA, USA
- Department of Chemistry, University of Padova, Padova, Italy
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Wawrzyniak UE, Ciosek P, Zaborowski M, Liu G, Gooding JJ. Gly-Gly-His Immobilized On Monolayer Modified Back-Side Contact Miniaturized Sensors for Complexation of Copper Ions. ELECTROANAL 2013. [DOI: 10.1002/elan.201200667] [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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Pensa E, Vericat C, Grumelli D, Salvarezza RC, Park SH, Longo GS, Szleifer I, Méndez De Leo LP. New insight into the electrochemical desorption of alkanethiol SAMs on gold. Phys Chem Chem Phys 2012; 14:12355-67. [PMID: 22870508 PMCID: PMC3472450 DOI: 10.1039/c2cp41291h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combination of Polarization Modulation Infrared Reflection Absorption Spectroscopy (PMIRRAS) under electrochemical control, Electrochemical Scanning Tunneling Microscopy (ECSTM) and Molecular Dynamics (MD) simulations has been used to shed light on the reductive desorption process of dodecanethiol (C12) and octadecanethiol (C18) SAMs on gold in aqueous electrolytes. Experimental PMIRRAS, ECSTM and MD simulations data for C12 desorption are consistent with formation of randomly distributed micellar aggregates stabilized by Na(+) ions, coexisting with a lying-down phase of molecules. The analysis of pit and Au island coverage before and after desorption is consistent with the thiolate-Au adatoms models. On the other hand, PMIRRAS and MD data for C18 indicate that the desorbed alkanethiolates adopt a Na(+) ion-stabilized bilayer of interdigitated alkanethiolates, with no evidence of lying down molecules. MD simulations also show that both the degree of order and tilt angle of the desorbed alkanethiolates change with the surface charge on the metal, going from bilayers to micelles. These results demonstrate the complexity of the alkanethiol desorption in the presence of water and the fact that chain length and counterions play a key role in a complex structure.
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Affiliation(s)
- Evangelina Pensa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA- CONICET- CCT La Plata), 1900 La Plata, Buenos Aires, Argentina
| | - Carolina Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA- CONICET- CCT La Plata), 1900 La Plata, Buenos Aires, Argentina
| | - Doris Grumelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA- CONICET- CCT La Plata), 1900 La Plata, Buenos Aires, Argentina
| | - Roberto C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA- CONICET- CCT La Plata), 1900 La Plata, Buenos Aires, Argentina
| | - Sung Hyun Park
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, U.S.A
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, U.S.A
| | - Gabriel S. Longo
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, U.S.A
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, U.S.A
| | - Igal Szleifer
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, U.S.A
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, U.S.A
| | - Lucila P. Méndez De Leo
- INQUIMAE, CONICET, DQIAQF, FCEN, UBA, Ciudad Universitaria, Pabellón II. Buenos Aires, Argentina
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Su Z, Leitch J, Lipkowski J. Measurements of the Potentials of Zero Free Charge and Zero Total Charge for 1-thio- ± bβ-D-glucose and DPTL Modified Au(111) Surface in Different Electrolyte Solutions. ACTA ACUST UNITED AC 2012. [DOI: 10.1524/zpch.2012.0280] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Abstract
The immersion method was used to measure the potential of zero free charge (E
pzfc) of a bare Au(111) electrode and the electrode modified by self-assembled monolayers (SAMs) of 1-thio-β-D-glucose (β-Tg) and 2,3-di-O-phytanyl-sn-glycerol-1-tetraethylene glycol-D,L-α-lipoic acid ester (DPTL). The measurements were performed in three electrolyte solutions: 0.1 M NaH2PO4, 0.1 MKClO4 and 0.1 M NaF. The E
pzc of the Au(111) electrode has different values in these electrolyte solutions due to the specific adsorption of phosphate and fluoride anions on the Au(111) surface. In contrast, when the gold surface is covered by a SAM of β-Tg, the adsorption of anions is suppressed and similar values of E
pzfc were measured in the three electrolytes. Additional chronocoulometric experiments were performed to determine the potentials of the zero total charge (E
pztc) for the thiol covered electrode. Significant differences between numerical values of potentials of the zero free charge E
pzfc and potentials of the zero total charge E
pztc were observed.
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Matyszewska D, Sek S, Bilewicz R. Electrochemical and microscopic characteristics of thiolipid layers as simple models of cell membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5182-5189. [PMID: 22352744 DOI: 10.1021/la2044027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The thiolipid 1,2-dipalmitoyl-sn-glycero-3-phosphothioethanol (DPPTE) has been proposed as a component of a simple model of cell membranes, which can be used for the studies of the interactions with drugs and other biologically important species. Depending on the deposition technique, Langmuir-Blodgett method or self-assembly, the obtained model membranes exhibit differences in the organization and properties, as shown by electrochemical techniques. The surface concentration and area per molecule of DPPTE model membranes were determined using chronocoulometry, which gives more reliable results than the widely used reductive desorption method. The mean surface concentration of self-assembled DPPTE monolayer deposited on gold electrode is equal to 4.52 × 10(-10) mol·cm(-2), which corresponds to the area per molecule of 36.7 Å(2). Moreover, model membranes prepared by means of LB method tend to be less compact than self-assembled DPPTE monolayers. Adsorption/desorption behavior of the DPPTE molecules on Au(111) was also visualized by EC-STM method. At the beginning of the process at negative potentials, the physisorbed molecules formed a flat-lying adlayer. Changing the potential in the positive direction resulted in the formation of Au-S bonds, and as a consequence the upstanding phase with higher packing density was observed. The thickness of such a layer determined by atomic force microscopy method is equal to 2.08 nm and corresponds to that of a monomolecular film.
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Kycia AH, Sek S, Su Z, Merrill AR, Lipkowski J. Electrochemical and STM studies of 1-thio-β-D-glucose self-assembled on a Au(111) electrode surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:13383-13389. [PMID: 21939277 DOI: 10.1021/la202978d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, a Au(111) electrode is functionalized with a monolayer of 1-thio-β-D-glucose (β-Tg), producing a hydrophilic surface. A monolayer of β-Tg was formed on a Au(111) surface by either (1) potential-assisted deposition with the thiol in a supporting electrolyte or (2) passive incubation of a gold substrate in a thiol-containing solution. For each method, the properties of the β-Tg monolayer were investigated using cyclic voltammetry (CV), differential capacitance (DC), and chronocoulometry. In addition, electrochemical scanning tunneling microscopy (EC-STM) was used to obtain images of the self-assembled monolayer with molecular resolution. Potential-assisted assembly of β-Tg onto a Au(111) electrode surface was found to be complicated by oxidation of β-Tg molecules. The EC-STM images revealed formation of a passive layer containing honeycomb-like domains characteristic of a formation of S(8) rings, indicating the S-C bond may have been cleaved. In contrast, passive self-assembly of thioglucose from a methanol solution was found to produce a stable, disordered monolayer of β-Tg. Since the passive assembly method was not complicated by the presence of a faradaic process, it is the method of choice for modifying the gold surface with a hydrophilic monolayer.
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Affiliation(s)
- Annia H Kycia
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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44
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Phospholipase A2 activity on supported thiolipid monolayers monitored by electrochemical and SPR methods. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2011.03.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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45
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Abstract
Tethered bilayer lipid membranes can be used as model platforms to host membrane proteins or membrane-active peptides, which can act as transducers in sensing applications. Here we present the synthesis and characterization of a valinomycin derivative, a depsipeptide that has been functionalized to serve as a redox probe in a lipid bilayer. In addition, we discuss the influence of the molecular structure of the lipid bilayer on its ability to host proteins. By using electrical impedance techniques as well as neutron scattering experiments, a clear correlation between the packing density of the lipids forming the membrane and its ability to host membrane proteins could be shown.
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Więckowska A, Jabłonowska E, Rogalska E, Bilewicz R. Structuring of supported hybrid phospholipid bilayers on electrodes with phospholipase A2. Phys Chem Chem Phys 2011; 13:9716-24. [DOI: 10.1039/c0cp02229b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Juhaniewicz J, Sek S. Peptide molecular junctions: Electron transmission through individual amino acid residues. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.01.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Doneux T, Steichen M, De Rache A, Buess-Herman C. Influence of the crystallographic orientation on the reductive desorption of self-assembled monolayers on gold electrodes. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.02.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zhan W, Jiang K, Smith MD, Bostic HE, Best MD, Auad ML, Ruppel JV, Kim C, Zhang XP. Photocurrent generation from porphyrin/fullerene complexes assembled in a tethered lipid bilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15671-15679. [PMID: 20831144 DOI: 10.1021/la102884u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A modular photocurrent generation system, based on amphiphilic porphyrin and fullerene species assembled in a tethered lipid bilayer matrix, is reported here. The key findings are (1) the amount of photoactive species can be quantitatively controlled in each leaflet of the bilayer and (2) the sequential formation of the bilayer allows a directional organization of these agents on electrodes. Photocurrent generation from seven differently configured photoactive bilayers is studied, which reveals several critical factors in achieving efficient photoinduced electron transfer across lipid membranes. Detailed fluorescence characterization is performed on porphyrin samples either in liposomes or surface-tethered bilayers; and the observed fluorescence quenching is correlated with photocurrents generated from the electrode-immobilized lipid films. The potential usefulness of this lipid-based approach is discussed in connection to several existing molecular photovoltaic systems.
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Affiliation(s)
- Wei Zhan
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA.
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