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Zaborowska-Mazurkiewicz M, Bizoń T, Matyszewska D, Fontaine P, Bilewicz R. Oxidation of lipid membrane cholesterol by cholesterol oxidase and its effects on raft model membrane structure. Colloids Surf B Biointerfaces 2024; 245:114191. [PMID: 39232481 DOI: 10.1016/j.colsurfb.2024.114191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 06/22/2024] [Accepted: 08/29/2024] [Indexed: 09/06/2024]
Abstract
The effects of a peripheral protein - cholesterol oxidase (3β-hydroxysteroid oxidase, ChOx) on the characteristics of model lipid membranes composed of cholesterol, cholesterol:sphingomyelin (1:1), and the raft model composed of DOPC:Chol:SM (1:1:1) were investigated using two membrane model systems: the flat monolayer prepared by the Langmuir technique and the curved model consisting of liposome of the same lipids. The planar monolayers and liposomes were employed to follow membrane cholesterol oxidation to cholestenone catalyzed by ChOx and changes in the lipid membrane structure accompanying this reaction. Changes in the structure of liposomes in the presence of the enzyme were reflected in the changes of hydrodynamic diameter and fluorescence microscopy images, while changes of surface properties of planar membranes were evaluated by grazing incidence X-ray diffraction (GIXD) and Brewster angle microscopy. UV-Vis absorbance measurements confirmed the activity of the enzyme in the tested systems. A better understanding of the interactions between the enzyme and the cell membrane may help in finding alternative ways to decrease excessive cholesterol levels than the common approach of treating hypercholesterolemia with statins, which are not free from undesirable side effects, repeatedly reported in the literature and observed by the patients.
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Affiliation(s)
| | - Teresa Bizoń
- Faculty of Physics, University of Warsaw, Pasteura 5, Warsaw 02093, Poland
| | - Dorota Matyszewska
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, Warsaw 02089, Poland
| | - Philippe Fontaine
- Synchrotron Soleil, L'Orme des Merisiers, Départementale 128, Saint-Aubin 91190, France
| | - Renata Bilewicz
- Faculty of Chemistry, University of Warsaw, Pasteura 1, Warsaw 02093, Poland.
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Kékicheff P, Heinrich B, Hemmerle A, Fontaine P, Lambour C, Beyer N, Favier D, Egele A, Emelyanenko KA, Modin E, Emelyanenko AM, Boinovich LB. Condensation or Desublimation: Nanolevel Structural Look on Two Frost Formation Pathways on Surfaces with Different Wettabilities. ACS NANO 2024; 18:15067-15083. [PMID: 38804165 DOI: 10.1021/acsnano.4c02192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Processes of water condensation and desublimation on solid surfaces are ubiquitous in nature and essential for various industrial applications, which are crucial for their performance. Despite their significance, these processes are not well understood due to the lack of methods that can provide insight at the nanolevel into the very first stages of phase transitions. Taking advantage of synchrotron grazing-incidence wide-angle X-ray scattering (GIWAXS) and environmental scanning electron microscopy (ESEM), two pathways of the frosting process from supersaturated vapors were studied in real time for substrates with different wettabilities ranging from highly hydrophilic to superhydrophobic. Within GIWAXS, a fully quantitative structural and orientational characterization of the undergoing phase transition reveals the information on degree of crystallinity of the new phase and determines the ordering at the surfaces and inside the films at the initial stages of water/ice nucleation from vapor onto the substrates. The diversity of frosting scenarios, including direct desublimation from the vapor and two-stage condensation-freezing processes, was observed by both GIWAXS and ESEM for different combinations of substrate wettability and vapor supersaturations. The classical nucleation theory straightforwardly predicts the pathway of the phase transition for hydrophobic and superhydrophobic substrates. The case of hydrophilic substrates is more intricate because the barriers in Gibbs free energy for nucleating both liquid and solid embryos are close to each other and comparable to thermal energy kBT. At that end, classical nucleation theory allows concluding a relation between contact angles for ice and water embryos on the basis of the observed frosting pathway.
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Affiliation(s)
- Patrick Kékicheff
- Institut Charles Sadron, Université de Strasbourg, C.N.R.S., UPR22, 23 rue du Loess, Strasbourg 67034, France
- Synchrotron SOLEIL, Saint-Aubin, L'Orme des Merisiers, Saint-Aubin 91190, France
| | - Benoît Heinrich
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, C.N.R.S., UMR7504, 23 rue du Loess, Strasbourg 67034, France
| | - Arnaud Hemmerle
- Synchrotron SOLEIL, Saint-Aubin, L'Orme des Merisiers, Saint-Aubin 91190, France
| | - Philippe Fontaine
- Synchrotron SOLEIL, Saint-Aubin, L'Orme des Merisiers, Saint-Aubin 91190, France
| | - Christophe Lambour
- Institut Charles Sadron, Université de Strasbourg, C.N.R.S., UPR22, 23 rue du Loess, Strasbourg 67034, France
| | - Nicolas Beyer
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, C.N.R.S., UMR7504, 23 rue du Loess, Strasbourg 67034, France
| | - Damien Favier
- Institut Charles Sadron, Université de Strasbourg, C.N.R.S., UPR22, 23 rue du Loess, Strasbourg 67034, France
| | - Antoine Egele
- Institut Charles Sadron, Université de Strasbourg, C.N.R.S., UPR22, 23 rue du Loess, Strasbourg 67034, France
| | - Kirill A Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
| | - Evgeny Modin
- CIC Nanogune BRTA, Donostia-San Sebastian 20018, Spain
| | - Alexandre M Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
| | - Ludmila B Boinovich
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
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Broniatowski M, Wydro P. Interactions of Brominated Flame Retardants with Membrane Models of Dehalogenating Bacteria: Langmuir Monolayer and Grazing Incidence X-ray Diffraction Studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:10600-10614. [PMID: 38721840 PMCID: PMC11112749 DOI: 10.1021/acs.langmuir.4c00518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 04/24/2024] [Accepted: 04/29/2024] [Indexed: 05/22/2024]
Abstract
Brominated flame retardants (BFRs) are small organic molecules containing several bromine substituents added to plastics to limit their flammability. BFRs can constitute up to 30% of the weight of some plastics, which is why they are produced in large quantities. Along with plastic waste and microplastic particles, BFRs end up in the soil and can easily leach causing contamination. As polyhalogenated molecules, multiple BFRs were classified as persistent organic pollutants (POPs), meaning that their biodegradation in the soils is especially challenging. However, some anaerobic bacteria as Dehaloccocoides can dehalogenate BFRs, which is important in the bioremediation of contaminated soils. BFRs are hydrophobic, can accumulate in plasma membranes, and disturb their function. On the other hand, limited membrane accumulation is necessary for BFR dehalogenation. To study the BFR-membrane interaction, we created membrane models of soil dehalogenating bacteria and tested their interactions with seven legacy and novel BFRs most common in soils. Phospholipid Langmuir monolayers with appropriate composition were used as membrane models. These membranes were doped in the selected BFRs, and the incorporation of BFR molecules into the phospholipid matrix and also the effects of BFR presence on membrane physical properties and morphology were studied. It turned out that the seven BFRs differed significantly in their membrane affinity. For some, the incorporation was very limited, and others incorporated effectively and could affect membrane properties, while one of the tested molecules induced the formation of bilayer domains in the membranes. Thus, Langmuir monolayers can be effectively used for pretesting BFR membrane activity.
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Affiliation(s)
- Marcin Broniatowski
- Department
of Environmental Chemistry, Faculty of Chemistry, the Jagiellonian University in Kraków, ul. Gronostajowa 2, Kraków 30-387, Poland
| | - Paweł Wydro
- Department
of Physical Chemistry and Electrochemistry, Faculty of Chemistry, the Jagiellonian University in Kraków, ul. Gronostajowa 2, Kraków 30-387, Poland
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Kharlamova A, Boulogne F, Fontaine P, Rouzière S, Hemmerle A, Goldmann M, Salonen A. Interface-Templated Crystal Growth in Sodium Dodecyl Sulfate Solutions with NaCl. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:84-90. [PMID: 38128069 DOI: 10.1021/acs.langmuir.3c01966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Many ionic surfactants, such as sodium dodecyl sulfate (SDS) crystallize out of solution if the temperature falls below the crystallization boundary. The crystallization temperature is impacted by solution properties and can be decreased with the addition of salt. We studied SDS crystallization at liquid/vapor interfaces from solutions at high ionic strength (sodium chloride). We show that the surfactant crystals at the surface grow from adsorbed SDS molecules, as evidenced by the preferential orientation of the crystals identified by using grazing incidence X-ray diffraction. We find a unique time scale for the crystal growth from the evolution of structure, surface tension, and visual inspection, which can be controlled through varying the SDS or NaCl concentrations.
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Affiliation(s)
- Anna Kharlamova
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - François Boulogne
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
| | - Philippe Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - Stéphan Rouzière
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
| | - Arnaud Hemmerle
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - Michel Goldmann
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
- Institut des NanoSciences de Paris, Sorbonne Université, 4 Place Jussieu, 75005 Paris, France
| | - Anniina Salonen
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
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