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Marquezin CA, Lamy MT, de Souza ES. Molecular collisions or resonance energy transfer in lipid vesicles? A methodology to tackle this question. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Osella S, Paloncýová M, Sahi M, Knippenberg S. Influence of Membrane Phase on the Optical Properties of DPH. Molecules 2020; 25:E4264. [PMID: 32957614 PMCID: PMC7570797 DOI: 10.3390/molecules25184264] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/05/2020] [Accepted: 09/14/2020] [Indexed: 11/24/2022] Open
Abstract
The fluorescent molecule diphenylhexatriene (DPH) has been often used in combination with fluorescence anisotropy measurements, yet little is known regarding the non-linear optical properties. In the current work, we focus on them and extend the application to fluorescence, while paying attention to the conformational versatility of DPH when it is embedded in different membrane phases. Extensive hybrid quantum mechanics/molecular mechanics calculations were performed to investigate the influence of the phase- and temperature-dependent lipid environment on the probe. Already, the transition dipole moments and one-photon absorption spectra obtained in the liquid ordered mixture of sphingomyelin (SM)-cholesterol (Chol) (2:1) differ largely from the ones calculated in the liquid disordered DOPC and solid gel DPPC membranes. Throughout the work, the molecular conformation in SM:Chol is found to differ from the other environments. The two-photon absorption spectra and the ones obtained by hyper-Rayleigh scattering depend strongly on the environment. Finally, a stringent comparison of the fluorescence anisotropy decay and the fluorescence lifetime confirm the use of DPH to gain information upon the surrounding lipids and lipid phases. DPH might thus open the possibility to detect and analyze different biological environments based on its absorption and emission properties.
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Affiliation(s)
- Silvio Osella
- Chemical and Biological Systems Simulation Lab, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Markéta Paloncýová
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Maryam Sahi
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Stefan Knippenberg
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
- Theory Lab, Hasselt University, Agoralaan Building D, 3590 Diepenbeek, Belgium
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Marquezin CA, Ito AS, de Souza ES. Organization and dynamics of NBD-labeled lipids in lipid bilayer analyzed by FRET using the small membrane fluorescent probe AHBA as donor. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:182995. [DOI: 10.1016/j.bbamem.2019.05.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/13/2019] [Accepted: 05/23/2019] [Indexed: 01/22/2023]
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Pazin WM, Vilanova N, Voets IK, Soares AEE, Ito AS. Effects of artepillin C on model membranes displaying liquid immiscibility. ACTA ACUST UNITED AC 2019; 52:e8281. [PMID: 30916221 PMCID: PMC6437936 DOI: 10.1590/1414-431x20198281] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 01/22/2019] [Indexed: 01/13/2023]
Abstract
It has been hypothesized that the therapeutic effects of artepillin C, a natural
compound derived from Brazilian green propolis, are likely related to its
partition in the lipid bilayer component of biological membranes. To test this
hypothesis, we investigated the effects of the major compound of green propolis,
artepillin C, on model membranes (small and giant unilamelar vesicles) composed
of ternary lipid mixtures containing cholesterol, which display liquid-ordered
(lo) and liquid-disordered (ld) phase coexistence.
Specifically, we explored potential changes in relevant membrane parameters upon
addition of artepillin C presenting both neutral and deprotonated states by
means of small angle X-ray scattering (SAXS), differential scanning calorimetry
(DSC), and confocal and multiphoton excitation fluorescence microscopy.
Thermotropic analysis obtained from DSC experiments indicated a loss in the
lipid cooperativity of lo phase at equilibrium conditions, while at
similar conditions spontaneous formation of unilamellar vesicles from SAXS
experiments showed that deprotonated artepillin C preferentially located at the
surface of the membrane. Time-resolved experiments using fluorescence microscopy
showed that at doses above 100 µM, artepillin C in its neutral state interacted
with both liquid-ordered and liquid-disordered phases, inducing curvature stress
and promoting dehydration at the membrane interface.
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Affiliation(s)
- W M Pazin
- Departmento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Departmento de Física, Faculdade de Ciências e Tecnologia, Universidade do Estado de São Paulo, Presidente Prudente, SP, Brasil
| | - N Vilanova
- Macromolecular and Organic Chemistry, Physical Chemistry & Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - I K Voets
- Macromolecular and Organic Chemistry, Physical Chemistry & Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands.,Dutch Polymer Institute (DPI), Eindhoven, The Netherlands
| | - A E E Soares
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A S Ito
- Departmento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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Voronina L, Masson A, Kamrath M, Schubert F, Clemmer D, Baldauf C, Rizzo T. Conformations of Prolyl–Peptide Bonds in the Bradykinin 1–5 Fragment in Solution and in the Gas Phase. J Am Chem Soc 2016; 138:9224-33. [DOI: 10.1021/jacs.6b04550] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Liudmila Voronina
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Antoine Masson
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Michael Kamrath
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Franziska Schubert
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany
| | - David Clemmer
- Department
of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Carsten Baldauf
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany
| | - Thomas Rizzo
- Laboratoire
de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
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Toptygin D, Chin AF, Hilser VJ. Effect of Diffusion on Resonance Energy Transfer Rate Distributions: Implications for Distance Measurements. J Phys Chem B 2015; 119:12603-22. [PMID: 26358033 DOI: 10.1021/acs.jpcb.5b06567] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Intrinsically disordered protein regions and many other biopolymers lack the three-dimensional structure that could be determined by X-ray crystallography or NMR, which encourages the application of alternative experimental methods. Time-resolved resonance energy transfer data are often used to measure distances between two fluorophores attached to a flexible biopolymer. This is complicated by the rotational and translational diffusion of the fluorophores and by nonmonoexponential donor decay in the absence of the acceptor. Equation I(DA)(t) = I(D)(t)·F(t) is derived here, which is applicable regardless of whether I(D)(t) is monoexponential. I(D)(t) and I(DA)(t) are the δ-excitation donor emission decays in the absence and in the presence of the acceptor; F(t) contains information about energy transfer, donor-acceptor distance distribution, and diffusion dynamics. It is shown that in the absence of rotational and translational diffusion, F(t) is a continuous distribution of exponentials, whereas in the presence of rotational and translational diffusion, F(t) is a sum of discrete exponentials. For each case it is shown how F(t) is related to the distance distribution. Experimental data obtained with a flexible tetradecapeptide in aqueous solution clearly demonstrate that F(t) is a sum of discrete exponential terms. A partial differential equation describing resonance energy transfer in the presence of both rotational and translational diffusion of the donor and acceptor tethered to the ends of a semiflexible chain is solved in this work using a combination of analytical and numerical methods; the solution is used to fit time-resolved emission of the donor, which makes it possible to determine the model parameters: contour length, persistence length, and the end-to-end translational diffusion coefficient.
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Affiliation(s)
- Dmitri Toptygin
- Department of Biology, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Alexander F Chin
- Department of Biology, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Vincent J Hilser
- Department of Biology, Johns Hopkins University , Baltimore, Maryland 21218, United States
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Fret Studies of Conformational Changes in Heparin-Binding Peptides. J Fluoresc 2014; 24:885-94. [DOI: 10.1007/s10895-014-1366-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 02/05/2014] [Indexed: 11/27/2022]
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