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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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2
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Gastaldi MS, Felsztyna I, Miguel V, Sánchez-Borzone ME, García DA. Theoretical and Experimental Study of Molecular Interactions of Fluralaner with Lipid Membranes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:2134-2142. [PMID: 36688903 DOI: 10.1021/acs.jafc.2c06811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Fluralaner is a relatively new insecticide belonging to the isoxazoline group, whose action mechanism involves the blocking of GABAA-receptors in the insect nervous system. Because of its high hydrophobicity, fluralaner could bioaccumulate and reach toxic local concentrations. Since there are no data available about the penetration and persistence of isoxazolines in biological membranes, we intend to evaluate fluralaner permanence as a pollutant by using model membranes. We used experimental and in silico models to characterize the incorporation of fluralaner into the lipid phase at different packing states. We determined its impact in the membrane structure and organization. Our results confirm that fluralaner is capable of penetrating, holding, and accumulating in the lipid membrane and provide details on its precise location and orientation. These properties would allow fluralaner to reach high local concentrations in different membranes and organs, which could be dangerous for vertebrate organisms if its handling is not properly controlled.
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Affiliation(s)
- María Salomé Gastaldi
- Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Universidad Nacional de Córdoba, Córdoba5016, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET-Universidad Nacional de Córdoba, Córdoba5016, Argentina
| | - Iván Felsztyna
- Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Universidad Nacional de Córdoba, Córdoba5016, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET-Universidad Nacional de Córdoba, Córdoba5016, Argentina
| | - Virginia Miguel
- Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Universidad Nacional de Córdoba, Córdoba5016, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET-Universidad Nacional de Córdoba, Córdoba5016, Argentina
| | - Mariela E Sánchez-Borzone
- Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Universidad Nacional de Córdoba, Córdoba5016, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET-Universidad Nacional de Córdoba, Córdoba5016, Argentina
| | - Daniel A García
- Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Universidad Nacional de Córdoba, Córdoba5016, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET-Universidad Nacional de Córdoba, Córdoba5016, Argentina
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Nguan H, Ishak KA, Zahid NI, Martinez-Felipe A, Hashim R, Aripin NFK. Incommensurate lamellar phase from long chain Mannosides: Investigation by X-Ray scattering and replica exchange molecular dynamics (REMD). J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Kowalska M, Broniatowski M, Mach M, Płachta Ł, Wydro P. Effect of lipopolymer (DSPE-PEG750) on phospholipid monolayers and bilayers differing in the structure of the polar head group. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117715] [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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Dyakin VV, Wisniewski TM, Lajtha A. Racemization in Post-Translational Modifications Relevance to Protein Aging, Aggregation and Neurodegeneration: Tip of the Iceberg. Symmetry (Basel) 2021; 13:455. [PMID: 34350031 PMCID: PMC8330555 DOI: 10.3390/sym13030455] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Homochirality of DNA and prevalent chirality of free and protein-bound amino acids in a living organism represents the challenge for modern biochemistry and neuroscience. The idea of an association between age-related disease, neurodegeneration, and racemization originated from the studies of fossils and cataract disease. Under the pressure of new results, this concept has a broader significance linking protein folding, aggregation, and disfunction to an organism's cognitive and behavioral functions. The integrity of cognitive function is provided by a delicate balance between the evolutionarily imposed molecular homo-chirality and the epigenetic/developmental impact of spontaneous and enzymatic racemization. The chirality of amino acids is the crucial player in the modulation the structure and function of proteins, lipids, and DNA. The collapse of homochirality by racemization is the result of the conformational phase transition. The racemization of protein-bound amino acids (spontaneous and enzymatic) occurs through thermal activation over the energy barrier or by the tunnel transfer effect under the energy barrier. The phase transition is achieved through the intermediate state, where the chirality of alpha carbon vanished. From a thermodynamic consideration, the system in the homo-chiral (single enantiomeric) state is characterized by a decreased level of entropy. The oscillating protein chirality is suggesting its distinct significance in the neurotransmission and flow of perceptual information, adaptive associative learning, and cognitive laterality. The common pathological hallmarks of neurodegenerative disorders include protein misfolding, aging, and the deposition of protease-resistant protein aggregates. Each of the landmarks is influenced by racemization. The brain region, cell type, and age-dependent racemization critically influence the functions of many intracellular, membrane-bound, and extracellular proteins including amyloid precursor protein (APP), TAU, PrP, Huntingtin, α-synuclein, myelin basic protein (MBP), and collagen. The amyloid cascade hypothesis in Alzheimer's disease (AD) coexists with the failure of amyloid beta (Aβ) targeting drug therapy. According to our view, racemization should be considered as a critical factor of protein conformation with the potential for inducing order, disorder, misfolding, aggregation, toxicity, and malfunctions.
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Affiliation(s)
- Victor V. Dyakin
- Virtual Reality Perception Lab (VRPL), The Nathan S. Kline Institute for Psychiatric Research (NKI), Orangeburg, NY 10962, USA
| | - Thomas M. Wisniewski
- Departments of Neurology, Pathology and Psychiatry, Center for Cognitive Neurology, New York University School of Medicine, New York, NY 10016, USA
| | - Abel Lajtha
- Center for Neurochemistry, The Nathan S. Kline Institute for Psychiatric Research (NKI), Orangeburg, NY 10962, USA
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Miguel V, Sánchez-Borzone ME, Mariani ME, García DA. Modulation of membrane physical properties by natural insecticidal ketones. Biophys Chem 2020; 269:106526. [PMID: 33348175 DOI: 10.1016/j.bpc.2020.106526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/09/2020] [Accepted: 12/09/2020] [Indexed: 11/16/2022]
Abstract
The insecticidal activity of Mentha oil and its main components has been tested and established for various insects/pests. Several mint ketones have demonstrated to act on GABAA receptors (GABAA-R), a transmembrane channel target of several important insecticides whose activity can be modulated by surface-active compounds and by changes in the physical properties of the lipid membrane. In the present work, we analyze the capacity of monoterpenic ketones most commonly found in Mentha species, pulegone and menthone, to interact with DPPC membranes by molecular dynamics (MD) simulations and Langmuir monolayers. The experimental results indicate that the presence of menthone and pulegone in the subphase modify the interfacial characteristics of DPPC isotherms. The changes were reflected as expansion of the isotherms and disappearance or bringing forward of DPPC phase transition. MD simulation corroborate these results and indicate that both ketones are located at the region of the carbonyl group, at the interface with the acyl chains. Ketone intercalation between lipid molecules would induce an increasing intermolecular interaction, diminishing the film elasticity and causing an ordering effect. Our results suggest that the insecticidal activity of both ketones could involve their interaction with lipid molecules causing disturbance of the cell membrane as postulated for several larvicide compounds, or at least modulating the receptor surrounding.
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Affiliation(s)
- V Miguel
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT), CONICET, Córdoba, Argentina
| | - M E Sánchez-Borzone
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT), CONICET, Córdoba, Argentina
| | - M E Mariani
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT), CONICET, Córdoba, Argentina
| | - D A García
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT), CONICET, Córdoba, Argentina.
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7
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Felsztyna I, Sánchez-Borzone ME, Miguel V, García DA. The insecticide fipronil affects the physical properties of model membranes: A combined experimental and molecular dynamics simulations study in Langmuir monolayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183378. [DOI: 10.1016/j.bbamem.2020.183378] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 12/31/2022]
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8
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Abstract
Either stereo reactants or stereo catalysis from achiral or chiral molecules are a prerequisite to obtain pure enantiomeric lipid derivatives. We reviewed a few plausibly organic syntheses of phospholipids under prebiotic conditions with special attention paid to the starting materials as pro-chiral dihydroxyacetone and dihydroxyacetone phosphate (DHAP), which are the key molecules to break symmetry in phospholipids. The advantages of homochiral membranes compared to those of heterochiral membranes were analysed in terms of specific recognition, optimal functions of enzymes, membrane fluidity and topological packing. All biological membranes contain enantiomerically pure lipids in modern bacteria, eukarya and archaea. The contemporary archaea, comprising of methanogens, halobacteria and thermoacidophiles, are living under extreme conditions reminiscent of primitive environment and may indicate the origin of one ancient evolution path of lipid biosynthesis. The analysis of the known lipid metabolism reveals that all modern cells including archaea synthetize enantiomerically pure lipid precursors from prochiral DHAP. Sn-glycerol-1-phosphate dehydrogenase (G1PDH), usually found in archaea, catalyses the formation of sn-glycerol-1-phosphate (G1P), while sn-glycerol-3-phosphate dehydrogenase (G3PDH) catalyses the formation of sn-glycerol-3-phosphate (G3P) in bacteria and eukarya. The selective enzymatic activity seems to be the main strategy that evolution retained to obtain enantiomerically pure lipids. The occurrence of two genes encoding for G1PDH and G3PDH served to build up an evolutionary tree being the basis of our hypothesis article focusing on the evolution of these two genes. Gene encoding for G3PDH in eukarya may originate from G3PDH gene found in rare archaea indicating that archaea appeared earlier in the evolutionary tree than eukarya. Archaea and bacteria evolved probably separately, due to their distinct respective genes coding for G1PDH and G3PDH. We propose that prochiral DHAP is an essential molecule since it provides a convergent link between G1DPH and G3PDH. The synthesis of enantiopure phospholipids from DHAP appeared probably firstly in the presence of chemical catalysts, before being catalysed by enzymes which were the products of later Darwinian selection. The enzymes were probably selected for their efficient catalytic activities during evolution from large libraries of vesicles containing amino acids, carbohydrates, nucleic acids, lipids, and meteorite components that induced symmetry imbalance.
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9
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Połeć K, Broniatowski M, Wydro P, Hąc-Wydro K. The impact of β-myrcene – the main component of the hop essential oil – on the lipid films. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113028] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Overduin M, Esmaili M. Memtein: The fundamental unit of membrane-protein structure and function. Chem Phys Lipids 2019; 218:73-84. [DOI: 10.1016/j.chemphyslip.2018.11.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 11/24/2018] [Accepted: 11/28/2018] [Indexed: 12/14/2022]
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11
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Moehwald H, Brezesinski G. From Langmuir Monolayers to Multilayer Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10445-10458. [PMID: 27540629 DOI: 10.1021/acs.langmuir.6b02518] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This feature article is intended to describe a route from Langmuir monolayers as the most suitable and well-defined models to polyelectrolyte multilayers. The latter are structurally controlled not with angstrom but with nanometer precision; however, they are very modular with regard to building blocks and function and are robust, therefore promising many diverse applications. There have been many methods developed to structurally characterize Langmuir monolayers; therefore, they serve as models in membrane biophysics and materials science as well as in general physics as two-dimensional model systems. Many of these methods as well as ideas to control interfaces could be taken over to study polyelectrolyte multilayers with their extended internal interfaces. Finally, as an outlook we try to sketch various aspects to transit toward systems with higher structural hierarchy, enabling the coupling of different functions and arriving at responsive three-dimensional systems.
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Affiliation(s)
- Helmuth Moehwald
- Max-Planck-Institute of Colloids and Interfaces, Am Muehlenberg 1, 14476 Potsdam, Germany
| | - Gerald Brezesinski
- Max-Planck-Institute of Colloids and Interfaces, Am Muehlenberg 1, 14476 Potsdam, Germany
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12
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Mariani ME, Sánchez-Borzone ME, García DA. Effects of bioactive monoterpenic ketones on membrane organization. A langmuir film study. Chem Phys Lipids 2016; 198:39-45. [DOI: 10.1016/j.chemphyslip.2016.05.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 04/13/2016] [Accepted: 05/03/2016] [Indexed: 10/21/2022]
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Stefaniu C, Brezesinski G, Möhwald H. Langmuir monolayers as models to study processes at membrane surfaces. Adv Colloid Interface Sci 2014; 208:197-213. [PMID: 24612663 DOI: 10.1016/j.cis.2014.02.013] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 02/13/2014] [Accepted: 02/14/2014] [Indexed: 12/12/2022]
Abstract
The use of new sophisticated and highly surface sensitive techniques as synchrotron based X-ray scattering techniques and in-house infrared reflection absorption spectroscopy (IRRAS) has revolutionized the monolayer research. Not only the determination of monolayer structures but also interactions between amphiphilic monolayers at the soft air/liquid interface and molecules dissolved in the subphase are important for many areas in material and life sciences. Monolayers are convenient quasi-two-dimensional model systems. This review focuses on interactions between amphiphilic molecules in binary and ternary mixtures as well as on interfacial interactions with interesting biomolecules dissolved in the subphase. The phase state of monolayers can be easily triggered at constant temperature by increasing the packing density of the lipids by compression. Simultaneously the monolayer structure changes are followed in situ by grazing incidence X-ray diffraction or IRRAS. The interactions can be indirectly determined by the observed structure changes. Additionally, the yield of enzymatic reaction can be quantitatively determined, secondary structures of peptides and proteins can be measured and compared with those observed in bulk. In this way, the influence of a confinement on the structural properties of biomolecules can be determined. The adsorption of DNA can be quantified as well as the competing adsorption of ions at charged interfaces. The influence of modified nanoparticles on model membranes can be clearly determined. In this review, the relevance and utility of Langmuir monolayers as suitable models to study physical and chemical interactions at membrane surfaces are clearly demonstrated.
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Affiliation(s)
- Cristina Stefaniu
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, D-14476 Potsdam, Germany
| | - Gerald Brezesinski
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, D-14476 Potsdam, Germany
| | - Helmuth Möhwald
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, D-14476 Potsdam, Germany.
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14
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Stefaniu C, Brezesinski G. Grazing incidence X-ray diffraction studies of condensed double-chain phospholipid monolayers formed at the soft air/water interface. Adv Colloid Interface Sci 2014; 207:265-79. [PMID: 24507806 DOI: 10.1016/j.cis.2014.01.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 01/13/2014] [Accepted: 01/14/2014] [Indexed: 10/25/2022]
Abstract
The use of highly brilliant synchrotron light sources in the middle of the 1980s for X-ray diffraction has revolutionized the research of condensed monolayers. Since then, monolayers gained popularity as convenient quasi two-dimensional model systems widely used in biophysics and material science. This review focuses on structures observed in one-component phospholipid monolayers used as simplified two-dimensional models of biological membranes. In a monolayer system the phase transitions can be easily triggered at constant temperature by increasing the packing density of the lipids by compression. Simultaneously the monolayer structure changes are followed in situ by grazing incidence X-ray diffraction. Competing interactions between the different parts of the molecule are responsible for the different monolayer structures. These forces can be modified by chemical variations of the hydrophobic chain region, of the hydrophilic head group region or of the interfacial region between chains and head groups. Modifications of monolayer structures triggered by changes of the chemical structure of double-chain phospholipids are highlighted in this paper.
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Stefaniu C, Vilotijevic I, Brezesinski G, Seeberger PH, Varón Silva D. A comparative structural study in monolayers of GPI fragments and their binary mixtures. Phys Chem Chem Phys 2014; 16:9259-65. [PMID: 24714927 DOI: 10.1039/c4cp00567h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- C Stefaniu
- Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany.
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Wydro P, Flasiński M, Broniatowski M. Molecular organization of bacterial membrane lipids in mixed systems--A comprehensive monolayer study combined with Grazing Incidence X-ray Diffraction and Brewster Angle Microscopy experiments. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1818:1745-54. [PMID: 22465064 DOI: 10.1016/j.bbamem.2012.03.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 02/25/2012] [Accepted: 03/13/2012] [Indexed: 01/11/2023]
Abstract
To properly design and investigate new antibacterial drugs a detailed description of the organization of bacterial membrane is highly important. Therefore in this work we performed a comprehensive characteristic of the Langmuir monolayers composed of phosphatidylethanolamine (PE) and phosphatidylglycerol (PG) mixed in a wide range of composition and treated as an artificial cytoplasmic layer of bacterial membrane. To obtain detailed information on the properties of these films we combined the analysis of the surface pressure-area curves with the surface potential measurements, Brewster Angle Microscopy studies and Grazing Incidence X-ray Diffraction experiments. It was found that the investigated phospholipids mix nonideally in the monolayers and that the most favorable packing of molecules occurs at their equimolar proportion. This is directly connected with the formation of hydrogen bonds between both types of molecules in the system. All the collected experimental data evidenced that dipalmitoylphosphatidylethanolamine (DPPE) and dipalmitoylphosphatidylglycerol (DPPG) form highly ordered associates of fixed (DPPE:DPPG 1:1) stoichiometry. The obtained results allow one to conclude a nonuniform distribution of lipids in bacterial membranes and the existence of domains composed of the investigated phospholipids. The latter seems to be of great importance in the perspective of further studies on the mechanism of action of antibacterial agents.
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Affiliation(s)
- Paweł Wydro
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland.
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Christoforou M, Leontidis E, Brezesinski G. Effects of Sodium Salts of Lyotropic Anions on Low-Temperature, Ordered Lipid Monolayers. J Phys Chem B 2012. [DOI: 10.1021/jp307004e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- M. Christoforou
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus
| | - E. Leontidis
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus
| | - G. Brezesinski
- Max Planck Institute of Colloids and Interfaces, D-14424 Potsdam-Golm, Germany
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Jallouli R, Fendri A, Mechichi T, Gargouri YT, Bezzine S. Kinetic Properties of a NovelFusariumsolani(phospho)lipase: A Monolayer Study. Chirality 2012; 25:35-8. [DOI: 10.1002/chir.22109] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 07/04/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Raida Jallouli
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS; Université de Sfax; Route de Soukra; 3038; Sfax; Tunisia
| | - Ahmed Fendri
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS; Université de Sfax; Route de Soukra; 3038; Sfax; Tunisia
| | - Tahar Mechichi
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS; Université de Sfax; Route de Soukra; 3038; Sfax; Tunisia
| | - Youssef Talèl Gargouri
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS; Université de Sfax; Route de Soukra; 3038; Sfax; Tunisia
| | - Sofiane Bezzine
- Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS; Université de Sfax; Route de Soukra; 3038; Sfax; Tunisia
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Petrov PG, Thompson JM, Rahman IBA, Ellis RE, Green EM, Miano F, Winlove CP. Two-dimensional order in mammalian pre-ocular tear film. Exp Eye Res 2007; 84:1140-6. [PMID: 17434484 DOI: 10.1016/j.exer.2007.02.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 02/05/2007] [Accepted: 02/15/2007] [Indexed: 11/26/2022]
Abstract
We report a grazing incidence x-ray diffraction (GIXD) investigation of the surface lipid layer of the pre-ocular tear film. For the first time we demonstrate the existence of 2D order over a wide range of surface pressures in this system, with typical spicing of 3.75A and 4.16A independent of the monolayer surface pressure. Analogous lipid ordering is also found in an artificial lipid mixture of the major lipid components of the tear film, suggesting that the 2D ordering is set by generic lipid-lipid interactions. Fluorescence microscopy of the natural and artificial tear film mixture reveals the co-existence of a dilute and a much more condensed phase in the amphiphilic lipid matrix over the pressure range of 15-45mN/m investigated by GIXD, plus an additional structure due to the much more hydrophobic part of the mixture. This evidence supports the previous hypothesis that tear film has a layered structure.
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20
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Molecular Self-Assembly into Crystals at Air-Liquid Interfaces. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141618.ch2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hayakawa T, Hirano Y, Makino A, Michaud S, Lagarde M, Pageaux JF, Doutheau A, Ito K, Fujisawa T, Takahashi H, Kobayashi T. Differential Membrane Packing of Stereoisomers of Bis(monoacylglycero)phosphate. Biochemistry 2006; 45:9198-209. [PMID: 16866366 DOI: 10.1021/bi060722o] [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: 11/30/2022]
Abstract
Bis(monoacylglycero)phosphate (BMP) reveals an unusual sn-1,sn-1' stereoconfiguration of glycerophosphate. We synthesized sn-(3-myristoyl-2-hydroxy)glycerol-1-phospho-sn-1'-(3'-myristoyl-2'-hydroxy)glycerol (1,1'-DMBMP) and characterized the thermotropic phase behavior and membrane structure, in comparison with those of the corresponding sn-3:sn-1' stereoisomer (3,1'-DMBMP), by means of differential scanning calorimetry (DSC), small- and wide-angle X-ray scattering (SAXS and WAXS, respectively), pressure-area (pi-A) isotherms, epifluorescence microscopy of monolayers, and molecular dynamics (MD) simulations. In DSC, these lipids exhibited weakly energetic broad peaks with an onset temperature of 9 degrees C for 1,1'-DMBMP and 18 degrees C for 3,1'-DMBMP. In addition, a highly cooperative, strongly energetic transition peak was observed at approximately 40 degrees C for 1,1'-DMBMP and approximately 42 degrees C for 3,1'-DMBMP. These results are supported by the observation that 1,1'-DMBMP exhibited a larger phase transition pressure (pi(c)) than 3,1'-DMBMP. Small- and wide-angle X-ray scattering measurements identified these small and large energetic transitions as a quasi-crystalline (L(c1))-quasi-crystalline with different tilt angle (L(c2)) phase transition and an L(c2)-L(alpha) main phase transition, respectively. X-ray measurements also revealed that these DMBMPs undergo an unbinding at the main phase transition temperature. The MD simulations estimated stronger hydrogen bonding formation in the 3,1'-DMBMP membrane than in 1,1'-DMBMP, supporting the experimental data.
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Affiliation(s)
- Tomohiro Hayakawa
- Lipid Biology Laboratory, RIKEN (Institute of Physical and Chemical Research), 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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22
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Ege C, Majewski J, Wu G, Kjaer K, Lee KYC. Templating Effect of Lipid Membranes on Alzheimer's Amyloid Beta Peptide. Chemphyschem 2005; 6:226-9. [PMID: 15751341 DOI: 10.1002/cphc.200400468] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Canay Ege
- Department of Chemistry, The James Franck Institute, University of Chicago Chicago IL 60637, USA
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23
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Superlattice configurations in linear chain hydrocarbon binary mixtures — Case ofn-C28H58:n-CxH2x+2 (x = 10,12,14,16). J CHEM SCI 2005. [DOI: 10.1007/bf02704360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Petrov JG, Brezesinski G, Andreeva TD, Möhwald H. Effect of Fluorination of the Hydrophilic Heads on Morphology and Molecular Structure of Langmuir Monolayers of Long-Chain Ethers. J Phys Chem B 2004. [DOI: 10.1021/jp047869e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jordan G. Petrov
- Max-Planck Institute of Colloids and Interfaces, D-14476 Golm/Potsdam, Germany
| | - Gerald Brezesinski
- Max-Planck Institute of Colloids and Interfaces, D-14476 Golm/Potsdam, Germany
| | - Tonya D. Andreeva
- Max-Planck Institute of Colloids and Interfaces, D-14476 Golm/Potsdam, Germany
| | - Helmuth Möhwald
- Max-Planck Institute of Colloids and Interfaces, D-14476 Golm/Potsdam, Germany
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25
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Maaloum M, Muller P, Krafft MP. Lateral and vertical nanophase separation in Langmuir-Blodgett films of phospholipids and semifluorinated alkanes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:2261-2264. [PMID: 15835680 DOI: 10.1021/la030312q] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
It has recently been found that monodisperse surface micelles (hemimicelles) were formed in Langmuir monolayers of the semifluorinated alkane C8F17C16H33 (F8H16) after transfer onto silicon wafers. Grazing incidence X-ray diffraction studies have demonstrated that compression of mixed Langmuir monolayers made from combinations of dipalmitoyl phosphatidylethanolamine (DPPE) and diblock F8H16 in various molar ratios resulted in the complete expulsion of the diblock molecule at high surface pressure. F8H16 then formed a second layer on top of a DPPE-only monolayer, demonstrating a novel type of reversible, pressure-induced, vertical phase separation. Using atomic force microscopy and X-ray reflectivity, we show now that mixed DPPE/F8H16 (1:1.3) Langmuir-Blodgett films transferred onto silicon wafers below 10 mN m(-1) are laterally phase separated and consist of domains of F8H16 surface micelles in coexistence with a monolayer of DPPE. The density of the network of F8H16 surface micelles increases when the surface pressure of transfer increases. Around 10 mN m(-1), the F8H16 surface micelles start to glide on the DPPE monolayer, progressively overlying it, until total coverage is achieved.
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Affiliation(s)
- Mounir Maaloum
- Institut Charles Sadron (UPR CNRS 22), 67083 Strasbourg Cedex, France
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26
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Nandi N, Vollhardt D. Effect of molecular chirality on the morphology of biomimetic langmuir monolayers. Chem Rev 2003; 103:4033-76. [PMID: 14531717 DOI: 10.1021/cr0006674] [Citation(s) in RCA: 169] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nilashis Nandi
- Chemistry Department, Birla Institute of Technology and Science, Pilani, Rajasthan 333031, India
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27
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Ohta N, Ban S, Tanaka H, Nakata S, Hatta I. Swelling of intercellular lipid lamellar structure with short repeat distance in hairless mouse stratum corneum as studied by X-ray diffraction. Chem Phys Lipids 2003; 123:1-8. [PMID: 12637160 DOI: 10.1016/s0009-3084(02)00126-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Lamellar structures of intercellular lipids in stratum corneum of hairless mouse were studied at various water contents by small-angle X-ray diffraction. At room temperature there are at least two lamellar structures, long and short lamellar structures, with repeat distances of 13.6 and around 6 nm, respectively. The long lamellar spacing is almost constant over the water content from 0% w/w to 80% w/w that is consistent with the previously reported results. For the short lamellar structure we found that with increasing the water content the lamellar spacing becomes larger, that is, from 12 to 50% w/w the short lamellar spacing increases from 5.8 to 6.6 nm. In addition to the previously reported result that at the water content of about 20% w/w the X-ray diffraction peak for the long lamellar structure becomes sharp, we found that this is also the case for the short lamellar structure. Below the water content of about 12% w/w the X-ray diffraction peak for the short lamellar structure dies out and conversely above the water content of about 50% w/w it becomes weak and finally merges into the second-order diffraction peak for the long lamellar structure. Considering the matching of the long lamellar spacing that is unchanged with the water content and twice the short lamellar spacing that changes as a function of the water content, it is likely that the swelling of the short lamellar structure plays an important role in the regulation of water stored in stratum corneum.
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Affiliation(s)
- Noboru Ohta
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
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28
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van Heerden E, Litthauer D, Verger R. Biochemical characterisation and kinetic properties of a purified lipase from Aspergillus niger in bulk phase and monomolecular films. Enzyme Microb Technol 2002. [DOI: 10.1016/s0141-0229(02)00031-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Lee KYC, Gopal A, von Nahmen A, Zasadzinski JA, Majewski J, Smith GS, Howes PB, Kjaer K. Influence of palmitic acid and hexadecanol on the phase transition temperature and molecular packing of dipalmitoylphosphatidyl-choline monolayers at the air–water interface. J Chem Phys 2002. [DOI: 10.1063/1.1420730] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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30
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Majewski J, Kuhl TL, Kjaer K, Smith GS. Packing of ganglioside-phospholipid monolayers: an x-ray diffraction and reflectivity study. Biophys J 2001; 81:2707-15. [PMID: 11606283 PMCID: PMC1301737 DOI: 10.1016/s0006-3495(01)75913-9] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Using synchrotron grazing-incidence x-ray diffraction (GIXD) and reflectivity, the in-plane and out-of-plane structure of mixed ganglioside-phospholipid monolayers was investigated at the air-water interface. Mixed monolayers of 0, 5, 10, 20, and 100 mol% ganglioside GM(1) and the phospholipid dipalmitoylphosphatidylethanolamine (DPPE) were studied in the solid phase at 23 degrees C and a surface pressure of 45 mN/m. At these concentrations and conditions the two components do not phase-separate and no evidence for domain formation was observed. X-ray scattering measurements reveal that GM(1) is accommodated within the host DPPE monolayer and does not distort the hexagonal in-plane unit cell or out-of-plane two-dimensional (2-D) packing compared with a pure DPPE monolayer. The oligosaccharide headgroups were found to extend normally from the monolayer surface, and the incorporation of these glycolipids into DPPE monolayers did not affect hydrocarbon tail packing (fluidization or condensation of the hydrocarbon region). This is in contrast to previous investigations of lipopolymer-lipid mixtures, where the packing structure of phospholipid monolayers was greatly altered by the inclusion of lipids bearing hydrophilic polymer groups. Indeed, the lack of packing disruptions by the oligosaccharide groups indicates that protein-GM(1) interactions, including binding, insertion, chain fluidization, and domain formation (lipid rafts), can be studied in 2-D monolayers using scattering techniques.
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Affiliation(s)
- J Majewski
- Manuel Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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31
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Jensen TR, Balashev K, Bjørnholm T, Kjaer K. Novel methods for studying lipids and lipases and their mutual interaction at interfaces. Part II. Surface sensitive synchrotron X-ray scattering. Biochimie 2001; 83:399-408. [PMID: 11368847 DOI: 10.1016/s0300-9084(01)01265-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Monolayers of lipids have been studied for more than a century. During the past decade new insight into the field has resulted from the development of surface sensitive X-ray scattering methods utilizing synchrotron radiation: grazing-incidence X-ray diffraction (GIXD) and specular X-ray reflectivity (XR). These novel methods provide direct microscopic information about the systems in question and allow in situ investigations under near physiological conditions. GIXD gives information about the in-plane molecular structure, e.g., lattice symmetry and structural parameters; XR provides the electron density profile across the interface. The present review describes the theory, experimental procedures and sample requirements for surface sensitive X-ray scattering. An overview of recent results is presented as well, with special emphasis on biologically important systems, e.g., investigations by GIXD and/or XR of lipid and protein structures at interfaces and of lipid/protein interactions.
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Affiliation(s)
- T R Jensen
- Condensed Matter Physics and Chemistry Department, Risø National Laboratory, 4000, Roskilde, Denmark.
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32
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Haas H, Caetano W, Borissevitch G, Tabak M, Mosquera Sanchez M, Oliveira O, Scalas E, Goldmann M. Interaction of dipyridamole with phospholipid monolayers at the air–water interface: Surface pressure and grazing incidence X-ray diffraction studies. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(00)01464-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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33
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Jensen TR, Kjaer K. Structural Properties and Interactions of Thin Films at the Air-Liquid Interface Explored by Synchrotron X-Ray Scattering. STUDIES IN INTERFACE SCIENCE 2001. [DOI: 10.1016/s1383-7303(01)80028-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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34
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Bringezu F, Brezesinski G, Möhwald H. Influence of side-chain length on phospholipid ordering in two dimensions. Chem Phys Lipids 1998. [DOI: 10.1016/s0009-3084(98)00061-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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35
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Pritsker M, Jones P, Blumenthal R, Shai Y. A synthetic all D-amino acid peptide corresponding to the N-terminal sequence of HIV-1 gp41 recognizes the wild-type fusion peptide in the membrane and inhibits HIV-1 envelope glycoprotein-mediated cell fusion. Proc Natl Acad Sci U S A 1998; 95:7287-92. [PMID: 9636141 PMCID: PMC22592 DOI: 10.1073/pnas.95.13.7287] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Recent studies demonstrated that a synthetic fusion peptide of HIV-1 self-associates in phospholipid membranes and inhibits HIV-1 envelope glycoprotein-mediated cell fusion, presumably by interacting with the N-terminal domain of gp41 and forming inactive heteroaggregates [Kliger, Y., Aharoni, A., Rapaport, D., Jones, P., Blumenthal, R. & Shai, Y. (1997) J. Biol. Chem. 272, 13496-13505]. Here, we show that a synthetic all D-amino acid peptide corresponding to the N-terminal sequence of HIV-1 gp41 (D-WT) of HIV-1 associates with its enantiomeric wild-type fusion (WT) peptide in the membrane and inhibits cell fusion mediated by the HIV-1 envelope glycoprotein. D-WT does not inhibit cell fusion mediated by the HIV-2 envelope glycoprotein. WT and D-WT are equally potent in inducing membrane fusion. D-WT peptide but not WT peptide is resistant to proteolytic digestion. Structural analysis showed that the CD spectra of D-WT in trifluoroethanol/water is a mirror image of that of WT, and attenuated total reflectance-fourier transform infrared spectroscopy revealed similar structures and orientation for the two enantiomers in the membrane. The results reveal that the chirality of the synthetic peptide corresponding to the HIV-1 gp41 N-terminal sequence does not play a role in liposome fusion and that the peptides' chirality is not necessarily required for peptide-peptide interaction within the membrane environment. Furthermore, studies along these lines may provide criteria to design protease-resistant therapeutic agents against HIV and other viruses.
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Affiliation(s)
- M Pritsker
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, 76100 Israel
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36
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de Meijere K, Brezesinski G, Möhwald H. Polyelectrolyte Coupling to a Charged Lipid Monolayer. Macromolecules 1997. [DOI: 10.1021/ma961490b] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kerstin de Meijere
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, D-12489 Berlin, Germany
| | - Gerald Brezesinski
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, D-12489 Berlin, Germany
| | - Helmuth Möhwald
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, D-12489 Berlin, Germany
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37
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Ransac S, Ivanova M, Verger R, Panaiotov I. [13] Monolayer techniques for studying lipase kinetics. Methods Enzymol 1997. [DOI: 10.1016/s0076-6879(97)86015-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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38
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Kenn R, Kjaer K, Möhwald H. Non-rotator phases in phospholipid monolayers? Colloids Surf A Physicochem Eng Asp 1996. [DOI: 10.1016/0927-7757(96)03697-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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39
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Raghunathan VA, Katsaras J. L beta '-->Lc' phase transition in phosphatidylcholine lipid bilayers: A disorder-order transition in two dimensions. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 54:4446-4449. [PMID: 9965601 DOI: 10.1103/physreve.54.4446] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Diederich A, Sponer C, Pum D, Sleytr UB, Lösche M. Reciprocal influence between the protein and lipid components of a lipid-protein membrane model. Colloids Surf B Biointerfaces 1996. [DOI: 10.1016/0927-7765(96)01267-2] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Bringezu F, Brezesinski G, Nuhn P, Möhwald H. Chiral discrimination in a monolayer of a triple-chain phosphatidylcholine. Biophys J 1996; 70:1789-95. [PMID: 8785338 PMCID: PMC1225148 DOI: 10.1016/s0006-3495(96)79742-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Monolayers of an enantiomeric and a racemic triple-chain phosphatidylcholine (PC) at the air/water interface are studied by film balance measurements and x-ray diffraction. Although the area per three tails exceeds that per head, we observe tail ordering dependent on headgroup chirality and chain tilt. This indicates lateral headgroup interactions. The influence of the chiral carbon is suppressed at higher lateral pressures, and a centered-rectangular unit cell with tails tilted into the nearest neighbor (NN) direction is observed for both the enantiomer and the racemate. The distortion of the lattice changes at medium pressures from NN to NNN (next-nearest neighbor direction) with decreasing temperature. The phase behavior of the racemate at 15 degrees C is compared with that of a triple-chain PC with a branched chain of reduced length. Whereas the PC with the longer branched chain exhibits only a NN tilted phase at all pressures, the PC with the shorter branched chain has a rich polymorphism (NNN-NN-upright hexagonal packing) under increased lateral pressure.
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Affiliation(s)
- F Bringezu
- University of Halle, Institute of Pharmaceutical Chemistry, Germany
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42
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Brezesinski G, Thoma M, Struth B, Möhwald H. Structural Changes of Monolayers at the Air/Water Interface Contacted with n-Alkanes. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952117t] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Brezesinski
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, 12489 Berlin, Germany, and Universität Mainz, Institut für Physikalische Chemie, Welder Weg 11, 55099 Mainz, Germany
| | - M. Thoma
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, 12489 Berlin, Germany, and Universität Mainz, Institut für Physikalische Chemie, Welder Weg 11, 55099 Mainz, Germany
| | - B. Struth
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, 12489 Berlin, Germany, and Universität Mainz, Institut für Physikalische Chemie, Welder Weg 11, 55099 Mainz, Germany
| | - H. Möhwald
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Rudower Chaussee 5, 12489 Berlin, Germany, and Universität Mainz, Institut für Physikalische Chemie, Welder Weg 11, 55099 Mainz, Germany
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43
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44
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Abstract
Surface viscosities of phospholipid/steroid mixtures at the air-water interface were measured by means of an oscillating pendulum. Phospholipids studied included 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC); 1,2-dipalmitoyl-sn-glycero-3-phosphodimethylethanolamine (DPPDME); 1,2-dipalmitoyl-sn-glycero-3-phosphomonomethylethanolamine (DPPMME); 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE); 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (DPPG); 1-palmitoyl-2-elaidyl-sn-glycero-3-phosphocholine and 1-palmitoyl-2-linelaidyl-sn-glycero-3-phosphocholine. Each saturated phospholipid was studied in the presence of cholesterol, DPPC was also investigated in the presence of 5-androsten-3beta-ol; cholestanol; 5-cholestene;5alpha-cholesten-3beta-ol methyl ether; coprostanol; 7,(5alpha)-cholesten-3beta-ol; desmosterol; epicholestanol; lanosterol and lophenol. The surface viscosities of the trans-unsaturated phosphatidylcholines (PC) were undetectable by this method and in this respect they resembled cis- unsaturated PC. The surface viscosities of saturated phospholipids were very high but were reduced by low concentrations of steroids. Interpretation of the results for DPPC/cholesterol mixtures indicates that DPPC functions at the air-water interface as a one-dimensional linear aggregate. At 50 mN/m and 22 degrees C the average structure contains approximately 300 DPPC molecules. DPPDME acts similarly but DPPMME, DPPE and DPPG differ from DPPC in their response to cholesterol. All of the steroids examined except 5-androsten-3beta-ol and the lanosterol mixture paralleled cholesterol in their interaction with DPPC an indication that phospholipid/steroid interactions modifying surface viscosity have less stringent requirements for the steroid structure than interactions measured as condensation in surface area.
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Affiliation(s)
- R W Evans
- Department of Epidemiology, GSPH, University of Pittsburgh, PA 15261, USA
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45
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Hwang J, Tamm LK, Ramalingam TS, Betzig E, Edidin M. Nanoscale complexity of phospholipid monolayers investigated by near-field scanning optical microscopy. Science 1995; 270:610-4. [PMID: 7570018 DOI: 10.1126/science.270.5236.610] [Citation(s) in RCA: 131] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Near-field scanning optical microscopy of phospholipid monolayers doped with fluorescent lipid analogs reveals previously undescribed features in various phases, including a concentration gradient at the liquid-expanded/liquid-condensed domain boundary and weblike structures in the solid-condensed phase. Presumably, the web structures are grain boundaries between crystalline solid lipid. These structures are strongly modulated by the addition of low concentrations of cholesterol and ganglioside GM1 in the monolayer.
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Affiliation(s)
- J Hwang
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
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46
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Nassoy P, Goldmann M, Bouloussa O, Rondelez F. Spontaneous chiral segregation in bidimensional films. PHYSICAL REVIEW LETTERS 1995; 75:457-460. [PMID: 10060026 DOI: 10.1103/physrevlett.75.457] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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47
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Long range tilt orientational order in phospholipid monolayers: a comparison of the order in the condensed phases of dimyristoylphosphatidylethanolamine and dipalmitoylphosphatidylcholine. Colloids Surf A Physicochem Eng Asp 1995. [DOI: 10.1016/0927-7757(95)03162-7] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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48
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Brezesinski G, Dietrich A, Struth B, Böhm C, Bouwman WG, Kjaer K, Möhwald H. Influence of ether linkages on the structure of double-chain phospholipid monolayers. Chem Phys Lipids 1995. [DOI: 10.1016/0009-3084(95)02439-p] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Peters GH, Toxvaerd S, Larsen NB, Bjørnholm T, Schaumburg K, Kjaer K. Structure and dynamics of lipid monolayers: implications for enzyme catalysed lipolysis. NATURE STRUCTURAL BIOLOGY 1995; 2:395-401. [PMID: 7664097 DOI: 10.1038/nsb0595-395] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We have investigated the role of the substrate on the interfacial activation of lipases by an interdisciplinary study of the structure and dynamics of 1,2-sn dipalmitoylglycerol monolayers at distinct surface pressures. The diglyceride Langmuir film undergoes two phase transitions occurring at 38.3 and 39.8 A2 per molecule. The first transition is unique for diglyceride molecules and is driven by a reorganization of the headgroups causing a change in the hydrophobicity of the oil-water interface. X-ray diffraction studies of different mesophases shows that in the two highest pressure phases, the alkyl chains pack in an hexagonal structure relaxing to a distorted-hexagonal lattice in the lowest pressure phase with the alkyl chains tilted by approximately 14 degrees in a direction close to a nearest neighbour direction.
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Affiliation(s)
- G H Peters
- Chemistry Department III, H.C. Orsted Institutet, University of Copenhagen, Denmark
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Katsaras J, Raghunathan VA. Molecular chirality and the "ripple" phase of phosphatidylcholine multibilayers. PHYSICAL REVIEW LETTERS 1995; 74:2022-2025. [PMID: 10057822 DOI: 10.1103/physrevlett.74.2022] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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