1
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Evans KO, Compton DL, Skory CD, Appell M. Biophysical characterization of α-glucan nanoparticles encapsulating feruloylated soy glycerides (FSG). BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2023; 40:e00817. [PMID: 38020725 PMCID: PMC10658199 DOI: 10.1016/j.btre.2023.e00817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 12/01/2023]
Abstract
Water insoluble α-glucans that were enzymatically synthesized using glucansucrase that was cloned from Leuconostoc mesenteroides NRRL B-1118 were previously shown to form nanoparticles via high pressure homogenization. These α-glucan nanoparticles were previously shown capable of encapsulating a small hydrophobic molecule. This work demonstrates that the same α-glucan can be formed into nanoparticles that encapsulate feruloylated soy glycerides from modified soybean oil, a product of interest to the cosmetic and skin care industries because of the UV absorbance and antioxidant properties of the feruloyl moiety. It is demonstrated that the feruloylated soy glyceride/α-glucan nanoparticles have distinct size, zeta potential and thermal profiles from that of nanoparticles made from α-glucan alone or feruloylated soy glyceride alone. Thermal analysis also demonstrates the release of feruloylated soy glycerides from the α-glucan nanoparticles.
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Affiliation(s)
- Kervin O. Evans
- USDA, Agricultural Research Service, National Center of Agricultural Utilization Research, Renewable Product Technology Research Unit, 1815 N. University Street, Peoria, IL 61604, United States of America
| | - David L. Compton
- USDA, Agricultural Research Service, National Center of Agricultural Utilization Research, Renewable Product Technology Research Unit, 1815 N. University Street, Peoria, IL 61604, United States of America
| | - Christopher D. Skory
- USDA, Agricultural Research Service, National Center of Agricultural Utilization Research, Renewable Product Technology Research Unit, 1815 N. University Street, Peoria, IL 61604, United States of America
| | - Michael Appell
- Mycotoxin Prevention and Applied Microbiology Research, 1815 N. University Street, Peoria, IL 61604, United States of America
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2
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Aqueous Heat Method for the Preparation of Hybrid Lipid–Polymer Structures: From Preformulation Studies to Protein Delivery. Biomedicines 2022; 10:biomedicines10061228. [PMID: 35740250 PMCID: PMC9220230 DOI: 10.3390/biomedicines10061228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/19/2022] [Accepted: 05/23/2022] [Indexed: 12/12/2022] Open
Abstract
Liposomes with adjuvant properties are utilized to carry biomolecules, such as proteins, that are often sensitive to the stressful conditions of liposomal preparation processes. The aim of the present study is to use the aqueous heat method for the preparation of polymer-grafted hybrid liposomes without any additional technique for size reduction. Towards this scope, liposomes were prepared through the combination of two different lipids with adjuvant properties, namely dimethyldioctadecylammonium (DDA) and D-(+)-trehalose 6,6′-dibehenate (TDB) and the amphiphilic block copolymer poly(2-(dimethylamino)ethyl methacrylate)-b-poly(lauryl methacrylate) (PLMA-b-PDMAEMA). For comparison purposes, PAMAM dendrimer generation 4 (PAMAM G4) was also used. Preformulation studies were carried out by differential scanning calorimetry (DSC). The physicochemical characteristics of the prepared hybrid liposomes were evaluated by light scattering and their morphology was evaluated by cryo-TEM. Subsequently, in vitro nanotoxicity studies were performed. Protein-loading studies with bovine serum albumin were carried out to evaluate their encapsulation efficiency. According to the results, PDMAEMA-b-PLMA was successfully incorporated in the lipid bilayer, providing improved physicochemical and morphological characteristics and the ability to carry higher cargos of protein, compared to pure DDA:TDB liposomes, without affecting the biocompatibility profile. In conclusion, the aqueous heat method can be applied in polymer-grafted hybrid liposomes for protein delivery without further size-reduction processes.
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3
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Kleetz J, Vasilopoulos G, Czolkoss S, Aktas M, Narberhaus F. Recombinant and endogenous ways to produce methylated phospholipids in Escherichia coli. Appl Microbiol Biotechnol 2021; 105:8837-8851. [PMID: 34709431 PMCID: PMC8590670 DOI: 10.1007/s00253-021-11654-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/15/2021] [Accepted: 10/19/2021] [Indexed: 10/31/2022]
Abstract
Escherichia coli is the daily workhorse in molecular biology research labs and an important platform microorganism in white biotechnology. Its cytoplasmic membrane is primarily composed of the phospholipids phosphatidylethanolamine (PE), phosphatidylglycerol (PG), and cardiolipin (CL). As in most other bacteria, the typical eukaryotic phosphatidylcholine (PC) is not a regular component of the E. coli membrane. PC is known to act as a substrate in various metabolic or catabolic reactions, to affect protein folding and membrane insertion, and to activate proteins that originate from eukaryotic environments. Options to manipulate the E. coli membrane to include non-native lipids such as PC might make it an even more powerful and versatile tool for biotechnology and protein biochemistry. This article outlines different strategies how E. coli can be engineered to produce PC and other methylated PE derivatives. Several of these approaches rely on the ectopic expression of genes from natural PC-producing organisms. These include PC synthases, lysolipid acyltransferases, and several phospholipid N-methyltransferases with diverse substrate and product preferences. In addition, we show that E. coli has the capacity to produce PC by its own enzyme repertoire provided that appropriate precursors are supplied. Screening of the E. coli Keio knockout collection revealed the lysophospholipid transporter LplT to be responsible for the uptake of lyso-PC, which is then further acylated to PC by the acyltransferase-acyl carrier protein synthetase Aas. Overall, our study shows that the membrane composition of the most routinely used model bacterium can readily be tailored on demand.Key points• Escherichia coli can be engineered to produce non-native methylated PE derivatives.• These lipids can be produced by foreign and endogenous proteins.• Modification of E. coli membrane offers potential for biotechnology and research.
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Affiliation(s)
- Julia Kleetz
- Microbial Biology, Faculty of Biology and Biotechnology, Ruhr University Bochum, Bochum, Germany
| | - Georgios Vasilopoulos
- Microbial Biology, Faculty of Biology and Biotechnology, Ruhr University Bochum, Bochum, Germany
| | - Simon Czolkoss
- Microbial Biology, Faculty of Biology and Biotechnology, Ruhr University Bochum, Bochum, Germany
| | - Meriyem Aktas
- Microbial Biology, Faculty of Biology and Biotechnology, Ruhr University Bochum, Bochum, Germany
| | - Franz Narberhaus
- Microbial Biology, Faculty of Biology and Biotechnology, Ruhr University Bochum, Bochum, Germany.
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4
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Waldie S, Sebastiani F, Moulin M, Del Giudice R, Paracini N, Roosen-Runge F, Gerelli Y, Prevost S, Voss JC, Darwish TA, Yepuri N, Pichler H, Maric S, Forsyth VT, Haertlein M, Cárdenas M. ApoE and ApoE Nascent-Like HDL Particles at Model Cellular Membranes: Effect of Protein Isoform and Membrane Composition. Front Chem 2021; 9:630152. [PMID: 33996741 PMCID: PMC8117676 DOI: 10.3389/fchem.2021.630152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/30/2021] [Indexed: 11/13/2022] Open
Abstract
Apolipoprotein E (ApoE), an important mediator of lipid transportation in plasma and the nervous system, plays a large role in diseases such as atherosclerosis and Alzheimer's. The major allele variants ApoE3 and ApoE4 differ only by one amino acid. However, this difference has major consequences for the physiological behaviour of each variant. In this paper, we follow (i) the initial interaction of lipid-free ApoE variants with model membranes as a function of lipid saturation, (ii) the formation of reconstituted High-Density Lipoprotein-like particles (rHDL) and their structural characterisation, and (iii) the rHDL ability to exchange lipids with model membranes made of saturated lipids in the presence and absence of cholesterol [1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) or 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) with and without 20 mol% cholesterol]. Our neutron reflection results demonstrate that the protein variants interact differently with the model membranes, adopting different protein conformations. Moreover, the ApoE3 structure at the model membrane is sensitive to the level of lipid unsaturation. Small-angle neutron scattering shows that the ApoE containing lipid particles form elliptical disc-like structures, similar in shape but larger than nascent or discoidal HDL based on Apolipoprotein A1 (ApoA1). Neutron reflection shows that ApoE-rHDL do not remove cholesterol but rather exchange saturated lipids, as occurs in the brain. In contrast, ApoA1-containing particles remove and exchange lipids to a greater extent as occurs elsewhere in the body.
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Affiliation(s)
- Sarah Waldie
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden.,Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Federica Sebastiani
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Martine Moulin
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Rita Del Giudice
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Nicolò Paracini
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Felix Roosen-Runge
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Yuri Gerelli
- Institut Laue-Langevin, Grenoble, France.,Department of Life and Environmental Sciences, Marche Polytechnic University, Ancona, Italy
| | | | - John C Voss
- Department of Biochemistry and Molecular Medicine, University of California, Davis, Davis, CA, United States
| | - Tamim A Darwish
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Nageshwar Yepuri
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Harald Pichler
- Austrian Centre of Industrial Biotechnology, Graz, Austria.,Graz University of Technology, Institute of Molecular Biotechnology, NAWI Graz, BioTechMed Graz, Graz, Austria
| | | | - V Trevor Forsyth
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France.,Faculty of Natural Sciences, Keele University, Staffordshire, United Kingdom
| | - Michael Haertlein
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Marité Cárdenas
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
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5
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Nielsen JE, König N, Yang S, Skoda MWA, Maestro A, Dong H, Cárdenas M, Lund R. Lipid membrane interactions of self-assembling antimicrobial nanofibers: effect of PEGylation. RSC Adv 2020; 10:35329-35340. [PMID: 35515685 PMCID: PMC9056946 DOI: 10.1039/d0ra07679a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/11/2020] [Indexed: 12/18/2022] Open
Abstract
Supramolecular assembly and PEGylation (attachment of a polyethylene glycol polymer chain) of peptides can be an effective strategy to develop antimicrobial peptides with increased stability, antimicrobial efficacy and hemocompatibility. However, how the self-assembly properties and PEGylation affect their lipid membrane interaction is still an unanswered question. In this work, we use state-of-the-art small angle X-ray and neutron scattering (SAXS/SANS) together with neutron reflectometry (NR) to study the membrane interaction of a series of multidomain peptides, with and without PEGylation, known to self-assemble into nanofibers. Our approach allows us to study both how the structure of the peptide and the membrane are affected by the peptide-lipid interactions. When comparing self-assembled peptides with monomeric peptides that are not able to undergo assembly due to shorter chain length, we found that the nanofibers interact more strongly with the membrane. They were found to insert into the core of the membrane as well as to absorb as intact fibres on the surface. Based on the presented results, PEGylation of the multidomain peptides leads to a slight net decrease in the membrane interaction, while the distribution of the peptide at the interface is similar to the non-PEGylated peptides. Based on the structural information, we showed that nanofibers were partially disrupted upon interaction with phospholipid membranes. This is in contrast with the considerable physical stability of the peptide in solution, which is desirable for an extended in vivo circulation time.
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Affiliation(s)
| | - Nico König
- Department of Chemistry, University of Oslo 0315 Oslo Norway .,Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH 52425 Jülich Germany
| | - Su Yang
- Department of Chemistry & Biochemistry, The University of Texas at Arlington Arlington Texas 76019 USA
| | - Maximilian W A Skoda
- ISIS Pulsed Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory Harwell Science and Innovation Campus, Didco Oxfordshire OX11 OQX UK
| | | | - He Dong
- Department of Chemistry & Biochemistry, The University of Texas at Arlington Arlington Texas 76019 USA
| | - Marité Cárdenas
- Biofilms Research Center for Biointerfaces, Department of Biomedical Science, Health and Society, Malmö University 20506 Malmö Sweden
| | - Reidar Lund
- Department of Chemistry, University of Oslo 0315 Oslo Norway
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6
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Clifton LA, Campbell RA, Sebastiani F, Campos-Terán J, Gonzalez-Martinez JF, Björklund S, Sotres J, Cárdenas M. Design and use of model membranes to study biomolecular interactions using complementary surface-sensitive techniques. Adv Colloid Interface Sci 2020; 277:102118. [PMID: 32044469 DOI: 10.1016/j.cis.2020.102118] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/24/2020] [Accepted: 01/29/2020] [Indexed: 01/07/2023]
Abstract
Cellular membranes are complex structures and simplified analogues in the form of model membranes or biomembranes are used as platforms to understand fundamental properties of the membrane itself as well as interactions with various biomolecules such as drugs, peptides and proteins. Model membranes at the air-liquid and solid-liquid interfaces can be studied using a range of complementary surface-sensitive techniques to give a detailed picture of both the structure and physicochemical properties of the membrane and its resulting interactions. In this review, we will present the main planar model membranes used in the field to date with a focus on monolayers at the air-liquid interface, supported lipid bilayers at the solid-liquid interface and advanced membrane models such as tethered and floating membranes. We will then briefly present the principles as well as the main type of information on molecular interactions at model membranes accessible using a Langmuir trough, quartz crystal microbalance with dissipation monitoring, ellipsometry, atomic force microscopy, Brewster angle microscopy, Infrared spectroscopy, and neutron and X-ray reflectometry. A consistent example for following biomolecular interactions at model membranes is used across many of the techniques in terms of the well-studied antimicrobial peptide Melittin. The overall objective is to establish an understanding of the information accessible from each technique, their respective advantages and limitations, and their complementarity.
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Affiliation(s)
- Luke A Clifton
- ISIS Pulsed Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 OQX, United Kingdom
| | - Richard A Campbell
- Division of Pharmacy and Optometry, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Federica Sebastiani
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Malmö University, 20506 Malmö, Sweden
| | - José Campos-Terán
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Col. Santa Fe, Delegación Cuajimalpa de Morelos, 05348, Mexico; Lund Institute of advanced Neutron and X-ray Science, Lund University, Scheelevägen 19, 223 70 Lund, Sweden
| | - Juan F Gonzalez-Martinez
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Malmö University, 20506 Malmö, Sweden
| | - Sebastian Björklund
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Malmö University, 20506 Malmö, Sweden
| | - Javier Sotres
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Malmö University, 20506 Malmö, Sweden
| | - Marité Cárdenas
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Malmö University, 20506 Malmö, Sweden.
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7
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Interactions between PAMAM dendrimers and DOPC lipid multilayers: Membrane thinning and structural disorder. Biochim Biophys Acta Gen Subj 2020; 1865:129542. [PMID: 31987955 DOI: 10.1016/j.bbagen.2020.129542] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/18/2020] [Accepted: 01/22/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Understanding the structure of hybrid nanoparticle-lipid multilayers is of fundamental importance to their bioanalytical applications and nanotoxicity, where nanoparticle-membrane interactions play an important role. Poly(amidoamine) (PAMAM) dendrimers are branched polymeric nanoparticles with potential biomedical applications due to precise tunability of their physicochemical properties. Here, the effect of PAMAM dendrimers (2.9-4.5 nm) with either a hydrophilic amine (NH2) or a hydrophobic C12 chain surface termination on the 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) multilayers has been studied for the first time. METHODS DOPC multilayers were created by the liposome-rupture method via drop-casting dendrimer-liposome dispersions with the dendrimers added at different concentrations and at three different stages. The multilayer structure was evaluated via the analysis of the synchrotron X-ray reflectivity (XRR) curves, obtaining the bilayer d-spacing, the coherence length from the Scherrer (Ls) analysis of the Bragg peaks, and the paracrystalline disorder parameter (g). RESULTS Dendrimer addition led to lipid bilayer thinning and more disordered multilayer structures. Larger hydrophobic dendrimers caused greater structural disruption to the multilayers compared to the smaller dendrimers. The smallest, positively charged dendrimers at their highest concentration caused the most pronounced bilayer thinning. The dendrimer-liposome mixing method also affected the multilayer structure due to different dendrimer aggregation involved. CONCLUSIONS These results show the complexity of the effect of dendrimer physicochemical properties and the addition method of dendrimers on the structure of mixed dendrimer-DOPC multilayers. GENERAL SIGNIFICANCE These insights are useful for fundamental understanding of nanotoxicity and future biomedical application of nanocomposite multilayer materials in which nanoparticles are added for enhanced properties and functionality.
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8
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Fatemi SM, Fatemi SJ, Abbasi Z. PAMAM dendrimer-based macromolecules and their potential applications: recent advances in theoretical studies. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-019-03076-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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9
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A biophysical study of the interactions between the antimicrobial peptide indolicidin and lipid model systems. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:1355-1364. [DOI: 10.1016/j.bbamem.2019.04.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 03/22/2019] [Accepted: 04/07/2019] [Indexed: 12/19/2022]
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10
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Lind TK, Skoda MWA, Cárdenas M. Formation and Characterization of Supported Lipid Bilayers Composed of Phosphatidylethanolamine and Phosphatidylglycerol by Vesicle Fusion, a Simple but Relevant Model for Bacterial Membranes. ACS OMEGA 2019; 4:10687-10694. [PMID: 31460166 PMCID: PMC6648305 DOI: 10.1021/acsomega.9b01075] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 06/06/2019] [Indexed: 05/06/2023]
Abstract
Supported lipid bilayers (SLBs) are simple and robust biomimics with controlled lipid composition that are widely used as models of both mammalian and bacterial membranes. However, the lipids typically used for SLB formation poorly resemble those of bacterial cell membranes due to the lack of available protocols to form SLBs using mixtures of lipids relevant for bacteria such as phosphatidylethanolamine (PE) and phosphatidylglycerol (PG). Although a few reports have been published recently on the formation of SLBs from Escherichia coli lipid extracts, a detailed understanding of these systems is challenging due to the complexity of the lipid composition in such natural extracts. Here, we present for the first time a simple and reliable protocol optimized to form high-quality SLBs using mixtures of PE and PG at compositions relevant for Gram-negative membranes. We show using neutron reflection and quartz microbalance not only that Ca2+ ions and temperature are key parameters for successful bilayer deposition but also that mass transfer to the surface is a limiting factor. Continuous flow of the lipid suspension is thus crucial for obtaining full SLB coverage. We furthermore characterize the resulting bilayers and report structural parameters, for the first time for PE and PG mixtures, which are in good agreement with those reported earlier for pure POPE vesicles. With this protocol in place, more suitable and reproducible studies can be conducted to understand biomolecular processes occurring at cell membranes, for example, for testing specificities and to unravel the mechanism of interaction of antimicrobial peptides.
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Affiliation(s)
- Tania Kjellerup Lind
- Biofilms Research
Centre for Biointerfaces and Biomedical Science Department, Faculty
of Health and Society, Malmo University, Malmo 20506, Sweden
| | | | - Marité Cárdenas
- Biofilms Research
Centre for Biointerfaces and Biomedical Science Department, Faculty
of Health and Society, Malmo University, Malmo 20506, Sweden
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11
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Ramos MC, Horta VAC, Horta BAC. Molecular Dynamics Simulations of PAMAM and PPI Dendrimers Using the GROMOS-Compatible 2016H66 Force Field. J Chem Inf Model 2019; 59:1444-1457. [DOI: 10.1021/acs.jcim.8b00911] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Mayk C. Ramos
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
| | - Vitor A. C. Horta
- Departamento de Ciência da Computação, Universidade Federal de Juiz de Fora, Juiz de Fora, 36036-900, Brazil
| | - Bruno A. C. Horta
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
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12
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PAMAM dendrimer - cell membrane interactions. Adv Colloid Interface Sci 2018; 257:1-18. [PMID: 30008347 DOI: 10.1016/j.cis.2018.06.005] [Citation(s) in RCA: 126] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 12/16/2022]
Abstract
PAMAM dendrimers have been conjectured for a wide range of biomedical applications due to their tuneable physicochemical properties. However, their application has been hindered by uncertainties in their cytotoxicity, which is influenced by dendrimer generation (i.e. size and surface group density), surface chemistry, and dosage, as well as cell specificity. In this review, biomedical applications of polyamidoamine (PAMAM) dendrimers and some related cytotoxicity studies are first outlined. Alongside these in vitro experiments, lipid membranes such as supported lipid bilayers (SLBs), liposomes, and Langmuir monolayers have been used as cell membrane models to study PAMAM dendrimer-membrane interactions. Related experimental and theoretical studies are summarized, and the physical insights from these studies are discussed to shed light on the fundamental understanding of PAMAM dendrimer-cell membrane interactions. We conclude with a summary of some questions that call for further investigations.
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13
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Hedegaard SF, Derbas MS, Lind TK, Kasimova MR, Christensen MV, Michaelsen MH, Campbell RA, Jorgensen L, Franzyk H, Cárdenas M, Nielsen HM. Fluorophore labeling of a cell-penetrating peptide significantly alters the mode and degree of biomembrane interaction. Sci Rep 2018; 8:6327. [PMID: 29679078 PMCID: PMC5910404 DOI: 10.1038/s41598-018-24154-z] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 03/28/2018] [Indexed: 12/05/2022] Open
Abstract
The demand for highly efficient macromolecular drugs, used in the treatment of many severe diseases, is continuously increasing. However, the hydrophilic character and large molecular size of these drugs significantly limit their ability to permeate across cellular membranes and thus impede the drugs in reaching their target sites in the body. Cell-penetrating peptides (CPP) have gained attention as promising drug excipients, since they can facilitate drug permeation across cell membranes constituting a major biological barrier. Fluorophores are frequently covalently conjugated to CPPs to improve detection, however, the ensuing change in physico-chemical properties of the CPPs may alter their biological properties. With complementary biophysical techniques, we show that the mode of biomembrane interaction may change considerably upon labeling of the CPP penetratin (PEN) with a fluorophore. Fluorophore-PEN conjugates display altered modes of membrane interaction with increased insertion into the core of model cell membranes thereby exerting membrane-thinning effects. This is in contrast to PEN, which localizes along the head groups of the lipid bilayer, without affecting the thickness of the lipid tails. Particularly high membrane disturbance is observed for the two most hydrophobic PEN conjugates; rhodamine B or 1-pyrene butyric acid, as compared to the four other tested fluorophore-PEN conjugates.
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Affiliation(s)
- Sofie Fogh Hedegaard
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Mohammed Sobhi Derbas
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Tania Kjellerup Lind
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Faculty of Health and Society, Malmö University, Per Albin Hanssons väg 35, 214 32, Malmö, Sweden
| | - Marina Robertnova Kasimova
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark.,Symphogen A/S, Pederstrupvej 93, 2750, Ballerup, Denmark
| | - Malene Vinther Christensen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, 2100, Copenhagen, Denmark
| | - Maria Høtoft Michaelsen
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Richard A Campbell
- Institut Laue-Langevin, 71 avenue des Martyrs, CS20156, 38042, Grenoble, France
| | - Lene Jorgensen
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Henrik Franzyk
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, 2100, Copenhagen, Denmark
| | - Marité Cárdenas
- Department of Biomedical Science and Biofilms - Research Center for Biointerfaces, Faculty of Health and Society, Malmö University, Per Albin Hanssons väg 35, 214 32, Malmö, Sweden.
| | - Hanne Mørck Nielsen
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark.
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14
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Li J, Jin K, Mushnoori SC, Dutt M. Mechanisms underlying interactions between PAMAM dendron-grafted surfaces with DPPC membranes. RSC Adv 2018; 8:24982-24992. [PMID: 35542143 PMCID: PMC9082323 DOI: 10.1039/c8ra03742f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 07/04/2018] [Indexed: 11/24/2022] Open
Abstract
Biofouling is a pervasive problem which demands the creation of smart, antifouling surfaces. Towards this end, we examine the interactions between a dipalmitoylphosphatidylcholine (DPPC) lipid bilayer and a polyamidoamine (PAMAM) dendron-grafted surface. In addition, we investigate the impact of dendron generation on the system behavior. To resolve the multiscale dynamical processes occurring over a large spatial scale, we employ Molecular Dynamics simulations with a coarse-grained implicit solvent force field. Our results demonstrate the transient and equilibrium system dynamics to be determined by the PAMAM dendron generation along with the underlying mechanisms. Higher generation dendrons are observed to favor penetration of the DPPC molecules into the dendron branches, thereby enabling sustained interactions between the membrane and the dendron-grafted surface. Under equilibrium, the membrane adopts a bowl-shaped morphology whose dimensions are determined by the dendron generation and density of interactions. The results from our study can be used to guide the design of novel surfaces with selective antifouling properties which can prevent the adsorption of microorganisms onto lipid membranes. The interactions between a DPPC lipid membrane and a PAMAM dendron-grafted surface.![]()
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Affiliation(s)
- Jia Li
- Department of Chemical and Biochemical Engineering
- Rutgers
- The State University of New Jersey
- USA
| | - Kai Jin
- Department of Chemical and Biochemical Engineering
- Rutgers
- The State University of New Jersey
- USA
| | - Srinivas C. Mushnoori
- Department of Chemical and Biochemical Engineering
- Rutgers
- The State University of New Jersey
- USA
| | - Meenakshi Dutt
- Department of Chemical and Biochemical Engineering
- Rutgers
- The State University of New Jersey
- USA
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15
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Browning KL, Lind TK, Maric S, Malekkhaiat-Häffner S, Fredrikson GN, Bengtsson E, Malmsten M, Cárdenas M. Human Lipoproteins at Model Cell Membranes: Effect of Lipoprotein Class on Lipid Exchange. Sci Rep 2017; 7:7478. [PMID: 28785025 PMCID: PMC5547137 DOI: 10.1038/s41598-017-07505-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 06/29/2017] [Indexed: 01/19/2023] Open
Abstract
High and low density lipoproteins (HDL and LDL) are thought to play vital roles in the onset and development of atherosclerosis; the biggest killer in the western world. Key issues of initial lipoprotein (LP) interactions at cellular membranes need to be addressed including LP deposition and lipid exchange. Here we present a protocol for monitoring the in situ kinetics of lipoprotein deposition and lipid exchange/removal at model cellular membranes using the non-invasive, surface sensitive methods of neutron reflection and quartz crystal microbalance with dissipation. For neutron reflection, lipid exchange and lipid removal can be distinguished thanks to the combined use of hydrogenated and tail-deuterated lipids. Both HDL and LDL remove lipids from the bilayer and deposit hydrogenated material into the lipid bilayer, however, the extent of removal and exchange depends on LP type. These results support the notion of HDL acting as the ‘good’ cholesterol, removing lipid material from lipid-loaded cells, whereas LDL acts as the ‘bad’ cholesterol, depositing lipid material into the vascular wall.
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Affiliation(s)
- K L Browning
- Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - T K Lind
- Department of Biomedical Sciences and Biofilms, Malmö University, Malmö, Sweden
| | - S Maric
- Department of Biomedical Sciences and Biofilms, Malmö University, Malmö, Sweden
| | | | - G N Fredrikson
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - E Bengtsson
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - M Malmsten
- Department of Pharmacy, Uppsala University, Uppsala, Sweden. .,Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark.
| | - M Cárdenas
- Department of Biomedical Sciences and Biofilms, Malmö University, Malmö, Sweden.
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16
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Docosahexaenoic acid triglyceride-based microemulsions with an added dendrimer – Structural considerations. J Colloid Interface Sci 2016; 483:374-384. [DOI: 10.1016/j.jcis.2016.08.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 08/11/2016] [Accepted: 08/12/2016] [Indexed: 12/22/2022]
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17
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Koutsioubas A. Combined Coarse-Grained Molecular Dynamics and Neutron Reflectivity Characterization of Supported Lipid Membranes. J Phys Chem B 2016; 120:11474-11483. [DOI: 10.1021/acs.jpcb.6b05433] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexandros Koutsioubas
- Jülich Centre for
Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
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18
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Kirsch SA, Böckmann RA. Membrane pore formation in atomistic and coarse-grained simulations. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1858:2266-2277. [PMID: 26748016 DOI: 10.1016/j.bbamem.2015.12.031] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 12/23/2015] [Accepted: 12/24/2015] [Indexed: 12/26/2022]
Abstract
Biological cells and their organelles are protected by ultra thin membranes. These membranes accomplish a broad variety of important tasks like separating the cell content from the outer environment, they are the site for cell-cell interactions and many enzymatic reactions, and control the in- and efflux of metabolites. For certain physiological functions e.g. in the fusion of membranes and also in a number of biotechnological applications like gene transfection the membrane integrity needs to be compromised to allow for instance for the exchange of polar molecules across the membrane barrier. Mechanisms enabling the transport of molecules across the membrane involve membrane proteins that form specific pores or act as transporters, but also so-called lipid pores induced by external fields, stress, or peptides. Recent progress in the simulation field enabled to closely mimic pore formation as supposed to occur in vivo or in vitro. Here, we review different simulation-based approaches in the study of membrane pores with a focus on lipid pore properties such as their size and energetics, poration mechanisms based on the application of external fields, charge imbalances, or surface tension, and on pores that are induced by small molecules, peptides, and lipids. This article is part of a Special Issue entitled: Biosimulations edited by Ilpo Vattulainen and Tomasz Róg.
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Affiliation(s)
- Sonja A Kirsch
- Computational Biology, Department of Biology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Rainer A Böckmann
- Computational Biology, Department of Biology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany.
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19
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Recent developments in methodology employed to study the interactions between nanomaterials and model lipid membranes. Anal Bioanal Chem 2015; 408:2743-58. [PMID: 26603178 DOI: 10.1007/s00216-015-9157-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/20/2015] [Accepted: 10/27/2015] [Indexed: 12/26/2022]
Abstract
With the boom of nanotechnology, nanomaterials (NMs) have been widely utilized in diverse applications, especially in biological and biomedical fields. Understanding how NMs interact with biomolecules, including proteins, DNA, and lipids, is of great importance for revealing the limitations posed and opportunities offered. Model lipid membrane, as a simplified cell membrane model, has been widely used to study the nanomaterial-lipid membrane interactions. In this article, current and emerging techniques, both experimental and theoretical, to investigate the interactions between NMs and model lipid membrane are summarized with each tool's capacities and limitations, along with future directions and challenges in this exciting area. This critical information will provide methodological guidance for researchers in this field.
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20
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Keszthelyi T, Holló G, Nyitrai G, Kardos J, Héja L. Bilayer Charge Reversal and Modification of Lipid Organization by Dendrimers as Observed by Sum-Frequency Vibrational Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7815-7825. [PMID: 26099064 DOI: 10.1021/acs.langmuir.5b00734] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyamidoamine (PAMAM) dendrimers are hyperbranched, nanosized polymers with promising biomedical applications as nanocarriers in targeted drug delivery and gene therapy. For the development of safe dendrimer-based biomedical applications it is necessary to gain an understanding of the detailed mechanism of the interactions of both cationic and anionic dendrimers with cell membranes. To characterize dendrimer-membrane interactions we applied solid-supported lipid bilayers as biomembrane models and utilized infrared-visible sum-frequency vibrational spectroscopy to independently probe the interactions of cationic G5-NH2 and anionic G4.5-COONa dendrimers with the two leaflets of the lipid bilayers. Interaction with both dendrimers led to changes in the interfacial water structure and charge density as evidenced by the changes in the OH band intensities in the sum-frequency spectra of the bilayers. Interaction with the G5-NH2 dendrimer also led to a unique inversion of the sign of the OH-stretch amplitudes, in addition to a decrease in their absolute values. We suggest that the positively charged amino groups on the G5-NH2 dendrimer surface bind to the negatively charged bilayer, while uncompensated positive charges not involved in the binding cause a reversal of the electric field and thus an opposite orientation of the interfacial water molecules. More subtle but nonetheless significant changes were seen in the relative magnitudes of the CH amplitudes. The methyl antisymmetric to symmetric stretch amplitude ratios are altered, implying changes in the tilt angles of the phospholipid alkyl chains. The conformational order of the phospholipid alkyl chains of both leaflets is also influenced by the G5-NH2 dendrimer while G4.5-COONa has no effect on the alkyl chain conformation.
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Affiliation(s)
- Tamás Keszthelyi
- †Institute of Materials and Environmental Chemistry and ‡Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Gábor Holló
- †Institute of Materials and Environmental Chemistry and ‡Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Gabriella Nyitrai
- †Institute of Materials and Environmental Chemistry and ‡Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Julianna Kardos
- †Institute of Materials and Environmental Chemistry and ‡Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - László Héja
- †Institute of Materials and Environmental Chemistry and ‡Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
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21
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Panizon E, Bochicchio D, Monticelli L, Rossi G. MARTINI Coarse-Grained Models of Polyethylene and Polypropylene. J Phys Chem B 2015; 119:8209-16. [DOI: 10.1021/acs.jpcb.5b03611] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emanuele Panizon
- Physics Department, University of Genoa, Via Dodecaneso
33, 16146 Genoa, Italy
| | - Davide Bochicchio
- Physics Department, University of Genoa, Via Dodecaneso
33, 16146 Genoa, Italy
| | - Luca Monticelli
- IBCP, CNRS UMR 5086, 7 Passage du Vercors, 69007 Lyon, France
| | - Giulia Rossi
- Physics Department, University of Genoa, Via Dodecaneso
33, 16146 Genoa, Italy
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22
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de Ghellinck A, Fragneto G, Laux V, Haertlein M, Jouhet J, Sferrazza M, Wacklin H. Lipid polyunsaturation determines the extent of membrane structural changes induced by Amphotericin B in Pichia pastoris yeast. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2317-25. [PMID: 26055896 DOI: 10.1016/j.bbamem.2015.06.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/20/2015] [Accepted: 06/04/2015] [Indexed: 12/18/2022]
Abstract
The activity of the potent but highly toxic antifungal drug Amphotericin B (AmB), used intravenously to treat systemic fungal and parasitic infections, is widely accepted to result from its specific interaction with the fungal sterol ergosterol. While the effect of sterols on AmB activity has been intensely investigated, the role of membrane phospholipid composition has largely been ignored, and structural studies of native membranes have been hampered by their complex and disordered nature. We show for the first time that the structure of fungal membranes derived from Pichia pastoris yeast depends on the degree of lipid polyunsaturation, which has an impact on the structural consequences of AmB activity. AmB inserts in yeast membranes even in the absence of ergosterol, and forms an extra-membraneous layer whose thickness is resolved to be 4-5 nm. In ergosterol-containing membranes, AmB insertion is accompanied by ergosterol extraction into this layer. The AmB-sponge mediated depletion of ergosterol from P. pastoris membranes gives rise to a significant membrane thinning effect that depends on the degree of lipid polyunsaturation. The resulting hydrophobic mismatch is likely to interfere with a much broader range of membrane protein functions than those directly involving ergosterol, and suggests that polyunsaturated lipids could boost the efficiency of AmB. Furthermore, a low degree of lipid polyunsaturation leads to least AmB insertion and may protect host cells against the toxic effects of AmB. These results provide a new framework based on lipid composition and membrane structure through which we can understand its antifungal action and develop better treatments.
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Affiliation(s)
- Alexis de Ghellinck
- Institut Laue-Langevin, 71 av des Martyrs, P.O. Box 156, 38000 Grenoble, France; Departement de Physique, Faculté des Sciences, Université Libre de Bruxelles, Bd du Triomphe CP223, 1050 Bruxelles, Belgium
| | - Giovanna Fragneto
- Institut Laue-Langevin, 71 av des Martyrs, P.O. Box 156, 38000 Grenoble, France
| | - Valerie Laux
- Institut Laue-Langevin, 71 av des Martyrs, P.O. Box 156, 38000 Grenoble, France
| | - Michael Haertlein
- Institut Laue-Langevin, 71 av des Martyrs, P.O. Box 156, 38000 Grenoble, France
| | - Juliette Jouhet
- Laboratoire de Physiologie Cellulaire et Végétale, CNRS/CEA/Univ. Grenoble Alpes/INRA, 38000 Grenoble, France
| | - Michele Sferrazza
- Departement de Physique, Faculté des Sciences, Université Libre de Bruxelles, Bd du Triomphe CP223, 1050 Bruxelles, Belgium
| | - Hanna Wacklin
- European Spallation Source ESS AB, P.O. Box 176, 22100 Lund, Sweden; Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
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23
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Bellini RG, Guimarães AP, Pacheco MAC, Dias DM, Furtado VR, de Alencastro RB, Horta BAC. Association of the anti-tuberculosis drug rifampicin with a PAMAM dendrimer. J Mol Graph Model 2015; 60:34-42. [PMID: 26093506 DOI: 10.1016/j.jmgm.2015.05.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 05/03/2015] [Accepted: 05/22/2015] [Indexed: 12/19/2022]
Abstract
The association of the anti-tuberculosis drug rifampicin (RIF) with a 4th-generation poly(amidoamine) (G4-PAMAM) dendrimer was investigated by means of molecular dynamics simulations. The RIF load capacity was estimated to be around 20 RIF per G4-PAMAM at neutral pH. The complex formed by 20 RIF molecules and the dendrimer (RIF20-PAMAM) was subjected to 100 ns molecular dynamics (MD) simulations at two different pH conditions (neutral and acidic). The complex was found to be significantly more stable in the simulation at neutral pH compared to the simulation at low pH in which the RIF molecules were rapidly and almost simultaneously expelled to the solvent bulk. The high stability of the RIF-PAMAM complex under physiological pH and the rapid release of RIF molecules under acidic medium provide an interesting switch for drug targeting since the Mycobacterium resides within acidic domains of the macrophage. Altogether, these results suggest that, at least in terms of stability and pH-dependent release, PAMAM-like dendrimers may be considered suitable drug delivery systems for RIF and derivatives.
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Affiliation(s)
| | - Ana P Guimarães
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Marco A C Pacheco
- Departamento de Engenharia Elétrica, PUC-Rio, Rio de Janeiro, Brazil
| | - Douglas M Dias
- Departamento de Engenharia Elétrica, PUC-Rio, Rio de Janeiro, Brazil
| | - Vanessa R Furtado
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Bruno A C Horta
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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24
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He XC, Lin M, Li F, Sha BY, Xu F, Qu ZG, Wang L. Advances in studies of nanoparticle–biomembrane interactions. Nanomedicine (Lond) 2015; 10:121-41. [DOI: 10.2217/nnm.14.167] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Nanoparticles (NPs) are widely applied in nanomedicine and diagnostics based on the interactions between NPs and the basic barrier (biomembrane). Understanding the underlying mechanism of these interactions is important for enhancing their beneficial effects and avoiding potential nanotoxicity. Experimental, mathematical and numerical modeling techniques are involved in this field. This article reviews the state-of-the-art techniques in studies of NP–biomembrane interactions with a focus on each technology's advantages and disadvantages. The aim is to better understand the mechanism of NP–biomembrane interactions and provide significant guidance for various fields, such as nanomedicine and diagnosis.
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Affiliation(s)
- Xiao Cong He
- Key Laboratory of Thermo-Fluid Science & Engineering of Ministry of Education, School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
| | - Min Lin
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science & Technology, Xi’an Jiaotong University, Xi’an 710049, PR China
| | - Fei Li
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
- Department of Chemistry, School of Sciences, Xi’an Jiaotong University, Xi’an 710049, PR China
| | - Bao Yong Sha
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
- Institute of Basic Medical Science, Xi’an Medical University, Xi’an 710021, PR China
| | - Feng Xu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science & Technology, Xi’an Jiaotong University, Xi’an 710049, PR China
| | - Zhi Guo Qu
- Key Laboratory of Thermo-Fluid Science & Engineering of Ministry of Education, School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
| | - Lin Wang
- Bioinspired Engineering & Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, PR China
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science & Technology, Xi’an Jiaotong University, Xi’an 710049, PR China
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25
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Maric S, Thygesen MB, Schiller J, Marek M, Moulin M, Haertlein M, Forsyth VT, Bogdanov M, Dowhan W, Arleth L, Pomorski TG. Biosynthetic preparation of selectively deuterated phosphatidylcholine in genetically modified Escherichia coli. Appl Microbiol Biotechnol 2015; 99:241-54. [PMID: 25301578 PMCID: PMC4289089 DOI: 10.1007/s00253-014-6082-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 08/28/2014] [Accepted: 09/09/2014] [Indexed: 01/07/2023]
Abstract
Phosphatidylcholine (PC) is a major component of eukaryotic cell membranes and one of the most commonly used phospholipids for reconstitution of membrane proteins into carrier systems such as lipid vesicles, micelles and nanodiscs. Selectively deuterated versions of this lipid have many applications, especially in structural studies using techniques such as NMR, neutron reflectivity and small-angle neutron scattering. Here we present a comprehensive study of selective deuteration of phosphatidylcholine through biosynthesis in a genetically modified strain of Escherichia coli. By carefully tuning the deuteration level in E. coli growth media and varying the deuteration of supplemented carbon sources, we show that it is possible to achieve a controlled deuteration for three distinct parts of the PC lipid molecule, namely the (a) lipid head group, (b) glycerol backbone and (c) fatty acyl tail. This biosynthetic approach paves the way for the synthesis of specifically deuterated, physiologically relevant phospholipid species which remain difficult to obtain through standard chemical synthesis.
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Affiliation(s)
- Selma Maric
- Structural Biophysics, Niels Bohr Institute, Faculty of Science, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
- Center for Membrane Pumps in Cells and Disease, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Mikkel B. Thygesen
- CARB Centre, Department of Chemistry, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Jürgen Schiller
- Institut für Medizinische Physik und Biophysik, Medizinische Fakultät, Universität Leipzig, Härtelstrasse 16-18, 04107 Leipzig, Germany
| | - Magdalena Marek
- Center for Membrane Pumps in Cells and Disease, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Martine Moulin
- Life Sciences Group, Institut Laue Langevin, 6 rue Jules Horowitz, CEDEX 9, BP156, 38042 Grenoble, France
- Faculty of Natural Sciences & Institute for Science and Technology in Medicine, Keele University, Staffordshire ST5 5BG, UK
| | - Michael Haertlein
- Life Sciences Group, Institut Laue Langevin, 6 rue Jules Horowitz, CEDEX 9, BP156, 38042 Grenoble, France
| | - V. Trevor Forsyth
- Life Sciences Group, Institut Laue Langevin, 6 rue Jules Horowitz, CEDEX 9, BP156, 38042 Grenoble, France
- Faculty of Natural Sciences & Institute for Science and Technology in Medicine, Keele University, Staffordshire ST5 5BG, UK
| | - Mikhail Bogdanov
- Department of Biochemistry and Molecular Biology, University of Texas Medical School at Houston, Houston, TX 77030, USA
| | - William Dowhan
- Department of Biochemistry and Molecular Biology, University of Texas Medical School at Houston, Houston, TX 77030, USA
| | - Lise Arleth
- Structural Biophysics, Niels Bohr Institute, Faculty of Science, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Thomas Günther Pomorski
- Center for Membrane Pumps in Cells and Disease, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
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26
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Rossi G, Monticelli L. Modeling the effect of nano-sized polymer particles on the properties of lipid membranes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:503101. [PMID: 25388874 DOI: 10.1088/0953-8984/26/50/503101] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The interaction between polymers and biological membranes has recently gained significant interest in several research areas. On the biomedical side, dendrimers, linear polyelectrolytes, and neutral copolymers find application as drug and gene delivery agents, as biocidal agents, and as platforms for biological sensors. On the environmental side, plastic debris is often disposed of in the oceans and gets degraded into small particles; therefore concern is raising about the interaction of small plastic particles with living organisms. From both perspectives, it is crucial to understand the processes driving the interaction between polymers and cell membranes. In recent times progress in computer technology and simulation methods has allowed computational predictions on the molecular mechanism of interaction between polymeric materials and lipid membranes. Here we review the computational studies on the interaction between lipid membranes and different classes of polymers: dendrimers, linear charged polymers, polyethylene glycol (PEG) and its derivatives, polystyrene, and some generic models of polymer chains. We conclude by discussing some of the technical challenges in this area and future developments.
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Affiliation(s)
- Giulia Rossi
- Department of Physics, University of Genoa, Genoa, Italy
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27
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Yanez Arteta M, Ainalem ML, Porcar L, Martel A, Coker H, Lundberg D, Chang DP, Soltwedel O, Barker R, Nylander T. Interactions of PAMAM Dendrimers with Negatively Charged Model Biomembranes. J Phys Chem B 2014; 118:12892-906. [DOI: 10.1021/jp506510s] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Marianna Yanez Arteta
- Physical
Chemistry, Center for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden
| | | | - Lionel Porcar
- Institut Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Anne Martel
- Institut Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Helena Coker
- Institut Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Dan Lundberg
- Physical
Chemistry, Center for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden
- CR
Competence AB, Center for Chemistry and Chemical Engineering, SE-221
00 Lund, Sweden
| | - Debby P. Chang
- Physical
Chemistry, Center for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden
| | - Olaf Soltwedel
- Max-Planck-Institute
for Solid State Research, Outstation at MLZ, Lichtenbergstr.
1, 85747 Garching, Germany
| | - Robert Barker
- Institut Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Tommy Nylander
- Physical
Chemistry, Center for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden
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28
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Bhattacharya R, Kanchi S, C R, Lakshminarayanan A, Seeck OH, Maiti PK, Ayappa KG, Jayaraman N, Basu JK. A new microscopic insight into membrane penetration and reorganization by PETIM dendrimers. SOFT MATTER 2014; 10:7577-7587. [PMID: 25115726 DOI: 10.1039/c4sm01112k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Dendrimers are highly branched polymeric nanoparticles whose structure and topology, largely, have determined their efficacy in a wide range of studies performed so far. An area of immense interest is their potential as drug and gene delivery vectors. Realizing this potential, depending on the nature of cell surface-dendrimer interactions, here we report controlled model membrane penetration and reorganization, using a model supported lipid bilayer and poly(ether imine) (PETIM) dendrimers of two generations. By systematically varying the areal density of the lipid bilayers, we provide a microscopic insight, through a combination of high resolution scattering, atomic force microscopy and atomistic molecular dynamics simulations, into the mechanism of PETIM dendrimer membrane penetration, pore formation and membrane re-organization induced by such interactions. Our work represents the first systematic observation of a regular barrel-like membrane spanning pore formation by dendrimers, tunable through lipid bilayer packing, without membrane disruption.
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Affiliation(s)
- R Bhattacharya
- Department of Physics, Indian Institute of Science, Bangalore, 560 012, India.
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29
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Kim Y, Kwak Y, Chang R. Free Energy of PAMAM Dendrimer Adsorption onto Model Biological Membranes. J Phys Chem B 2014; 118:6792-802. [DOI: 10.1021/jp501755k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yongbin Kim
- Department of Chemistry, Kwangwoon University, Seoul 139-701, Republic of Korea
| | - Yongkyu Kwak
- Department of Chemistry, Kwangwoon University, Seoul 139-701, Republic of Korea
| | - Rakwoo Chang
- Department of Chemistry, Kwangwoon University, Seoul 139-701, Republic of Korea
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30
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Berényi S, Mihály J, Wacha A, Tőke O, Bóta A. A mechanistic view of lipid membrane disrupting effect of PAMAM dendrimers. Colloids Surf B Biointerfaces 2014; 118:164-71. [DOI: 10.1016/j.colsurfb.2014.03.048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 03/20/2014] [Accepted: 03/24/2014] [Indexed: 11/26/2022]
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31
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Campbell RA, Watkins EB, Jagalski V, Åkesson-Runnsjö A, Cárdenas M. Key Factors Regulating the Mass Delivery of Macromolecules to Model Cell Membranes: Gravity and Electrostatics. ACS Macro Lett 2014; 3:121-125. [PMID: 35590490 DOI: 10.1021/mz400551h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We show that both gravity and electrostatics are key factors regulating interactions between model cell membranes and self-assembled liquid crystalline aggregates of dendrimers and phospholipids. The system is a proxy for the trafficking of reservoirs of therapeutic drugs to cell membranes for slow diffusion and continuous delivery. Neutron reflectometry measurements were carried out on supported lipid bilayers of varying charge and on hydrophilic silica surfaces. Translocation of the macromolecule across the membrane and adsorption of the lamellar aggregates occur only when the membrane (1) is located above the bulk liquid and (2) has sufficient negative charge. The impact of such dramatic directionality effects due to bulk phase separation and gravity is emphasized for future biochemical investigations. Further, the potential to switch on the interaction mechanism through tuning the charge of the aggregates to activate endocytosis pathways on specific cell types is discussed in the context of targeted drug delivery applications.
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Affiliation(s)
- Richard A. Campbell
- Insitut Laue-Langevin, 6 rue
Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Erik B. Watkins
- Insitut Laue-Langevin, 6 rue
Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France
| | - Vivien Jagalski
- Department
of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken
5, DK-2100 Copenhagen, Denmark
| | - Anna Åkesson-Runnsjö
- Department
of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken
5, DK-2100 Copenhagen, Denmark
| | - Marité Cárdenas
- Department
of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken
5, DK-2100 Copenhagen, Denmark
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32
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Molecular simulation study of PAMAM dendrimer composite membranes. J Mol Model 2014; 20:2119. [DOI: 10.1007/s00894-014-2119-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 12/14/2013] [Indexed: 01/20/2023]
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33
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Maric S, Skar-Gislinge N, Midtgaard S, Thygesen MB, Schiller J, Frielinghaus H, Moulin M, Haertlein M, Forsyth VT, Pomorski TG, Arleth L. Stealth carriers for low-resolution structure determination of membrane proteins in solution. ACTA ACUST UNITED AC 2014; 70:317-28. [PMID: 24531466 DOI: 10.1107/s1399004713027466] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 10/07/2013] [Indexed: 02/07/2023]
Abstract
Structural studies of membrane proteins remain a great experimental challenge. Functional reconstitution into artificial nanoscale bilayer disc carriers that mimic the native bilayer environment allows the handling of membrane proteins in solution. This enables the use of small-angle scattering techniques for fast and reliable structural analysis. The difficulty with this approach is that the carrier discs contribute to the measured scattering intensity in a highly nontrivial fashion, making subsequent data analysis challenging. Here, an elegant solution to circumvent the intrinsic complexity brought about by the presence of the carrier disc is presented. In combination with small-angle neutron scattering (SANS) and the D2O/H2O-based solvent contrast-variation method, it is demonstrated that it is possible to prepare specifically deuterated carriers that become invisible to neutrons in 100% D2O at the length scales relevant to SANS. These `stealth' carrier discs may be used as a general platform for low-resolution structural studies of membrane proteins using well established data-analysis tools originally developed for soluble proteins.
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Affiliation(s)
- Selma Maric
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Nicholas Skar-Gislinge
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Søren Midtgaard
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Mikkel B Thygesen
- CARB Centre, Department of Chemistry, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Jürgen Schiller
- Institut für Medizinische Physik und Biophysik, Medizinische Fakultät, Universität Leipzig, Härtelstrasse 16-18, 04107 Leipzig, Germany
| | - Henrich Frielinghaus
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Scattering, TUM FRM-2, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Martine Moulin
- Life Sciences Group, Institut Laue-Langevin, 6 Rue Jules Horowitz, 38042 Grenoble, France
| | - Michael Haertlein
- Life Sciences Group, Institut Laue-Langevin, 6 Rue Jules Horowitz, 38042 Grenoble, France
| | - V Trevor Forsyth
- Life Sciences Group, Institut Laue-Langevin, 6 Rue Jules Horowitz, 38042 Grenoble, France
| | - Thomas Günther Pomorski
- Center for Membrane Pumps in Cells and Disease, Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg C, Denmark
| | - Lise Arleth
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
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34
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Lind TK, Zielińska P, Wacklin HP, Urbańczyk-Lipkowska Z, Cárdenas M. Continuous flow atomic force microscopy imaging reveals fluidity and time-dependent interactions of antimicrobial dendrimer with model lipid membranes. ACS NANO 2014; 8:396-408. [PMID: 24303991 DOI: 10.1021/nn404530z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this paper, an amphiphilic peptide dendrimer with potential applications against multi-resistant bacteria such as Staphylococcus aureus was synthesized and studied on model cell membranes. The combination of quartz crystal microbalance and atomic force microscopy imaging during continuous flow allowed for in situ monitoring of the very initial interaction processes and membrane transformations on longer time scales. We used three different membrane compositions of low and high melting temperature phospholipids to vary the membrane properties from a single fluid phase to a pure gel phase, while crossing the phase coexistence boundaries at room temperature. The interaction mechanism of the dendrimer was found to be time-dependent and to vary remarkably with the fluidity and coexistence of liquid-solid phases in the membrane. Spherical micelle-like dendrimer-lipid aggregates were formed in the fluid-phase bilayer and led to partial solubilization of the membrane, while in gel-phase membranes, the dendrimers caused areas of local depressions followed by redeposition of flexible lipid patches. Domain coexistence led to a sequence of events initiated by the formation of a ribbon-like network and followed by membrane solubilization via spherical aggregates from the edges of bilayer patches. Our results show that the dendrimer molecules were able to destroy the membrane integrity through different mechanisms depending on the lipid phase and morphology and shed light on their antimicrobial activity. These findings could have an impact on the efficacy of the dendrimers since lipid membranes in certain bacteria have transition temperatures very close to the host body temperature.
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Affiliation(s)
- Tania Kjellerup Lind
- Nano-Science Center and Institute of Chemistry, Copenhagen University , København DK2100, Denmark
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35
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Choudhury CK, Kumar A, Roy S. Characterization of Conformation and Interaction of Gene Delivery Vector Polyethylenimine with Phospholipid Bilayer at Different Protonation State. Biomacromolecules 2013; 14:3759-68. [DOI: 10.1021/bm4011408] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Abhinaw Kumar
- Department
of Chemistry, Indian Institute of Science Education and Research, Pune 411008, India
| | - Sudip Roy
- Physical
Chemistry Division, National Chemical Laboratory, Pune 411008, India
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36
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Ruggeri F, Akesson A, Chapuis PY, Skrzynski Nielsen CA, Monopoli MP, Dawson KA, Pomorski TG, Cárdenas M. The dendrimer impact on vesicles can be tuned based on the bilayer charge and the presence of albumin. SOFT MATTER 2013; 9:8862-8870. [PMID: 25419553 DOI: 10.1039/c3sm50603g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
PAMAM (polyamidoamine) dendrimers are promising in biomedical applications that can interact with both the bilayer and . Here we employed giant unilamellar vesicles (GUVs) of two different charge densities to study the effect of albumin, one of the major in blood plasma, on the interactions between PAMAM dendrimers and membranes. The results show that albumin exacerbates the effect of dendrimers on the destabilization of the vesicles in terms of leakage, aggregation and collapse in particular for negatively charged vesicles while neutrally charged membranes are not affected. We conclude that the higher affinity of both albumin and PAMAM G6 towards negatively charged membranes explains their synergistic behavior in this case. In the case of neutral vesicles, the affinity between PAMAM G6 and albumin is stronger than that between PAMAM G6 (or albumin) and neutral vesicles, and thus no synergism is observed for the mixture during the interaction with neutral membranes.
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Affiliation(s)
- Francesca Ruggeri
- Institute of Chemistry and Nano-Science Center, University of Copenhagen, Universitetparken 5, DK 2100, Copenhagen, Denmark.
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37
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Ruggeri F, Zhang F, Lind T, Bruce ED, Lau BLT, Cárdenas M. Non-specific interactions between soluble and induce irreversible changes in the properties of bilayers. SOFT MATTER 2013; 9:4219-4226. [PMID: 25419552 DOI: 10.1039/c3sm27769k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Soluble in the extracellular matrix experience a crowded environment. However, most of the biophysical studies performed to date have focused on concentrations within the dilute regime (well below the mM range). Here, we systematically studied the interaction of model cell membrane systems (giant unilamellar vesicles and supported bilayers) with soluble globular , bovine serum albumin, and lysozyme at physiologically relevant concentrations. To mimic the extracellular environment more closely, we also used fetal bovine serum as a good representative of a biomimetic mixture. We found that regardless of the used (and thus of their biological function), the interactions between a model cell membrane and these are determined by their physico-chemical characteristics, mainly their dipolar character (or charged patches). In this paper we discuss the specificity and reversibility of these interactions and their potential implications on the living cells. In particular, we report initial evidence for an additional role of in cell membranes: that of reducing the effects of non-specific of soluble on the cell membrane.
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Affiliation(s)
- Francesca Ruggeri
- Institute of Chemistry and Nano-Science Center, University of Copenhagen, Universitetparken 5, DK 2100, Copenhagen, Denmark.
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38
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Wadsäter M, Barker R, Mortensen K, Feidenhans'l R, Cárdenas M. Effect of phospholipid composition and phase on nanodisc films at the solid-liquid interface as studied by neutron reflectivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2871-2880. [PMID: 23373466 DOI: 10.1021/la3024698] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanodiscs are disc-like self-assembled structures formed by phospholipids and amphipatic proteins. The proteins wrap like a belt around the hydrophobic part of the lipids, basically producing nanometer-sized patches of lipid bilayers. The bilayer in the nanodisc constitutes a native-like model of the cell membrane and can act as a nanometer-sized container for functional single membrane proteins. In this study, we present a general nanodisc-based system, intended for structural and functional studies of membrane proteins. In this method, the nanodiscs are aligned at a solid surface, providing the ability to determine the average structure of the film along an axis perpendicular to the interface as measured by neutron reflectivity. The nanodisc film was optimized in terms of nanodisc coverage, reduced film roughness, and stability for time-consuming studies. This was achieved by a systematic variation of the lipid phase, charge, and length of lipid tails. Herein, we show that, although all studied nanodiscs align with their lipid bilayer parallel to the interface, gel-phase DMPC nanodiscs form the most suitable film for future membrane protein studies since they yield a dense irreversibly adsorbed film with low roughness and high stability over time. This may be explained by the appropriate matching between the thickness of the hydrophobic lipid core of gel phase DMPC and the height of the belt protein. Moreover, once formed the gel-phase DMPC nanodiscs film can be heated up to melt the lipid bilayer, thus providing a more biologically friendly environment for membrane proteins.
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Affiliation(s)
- Maria Wadsäter
- Nano-Science Center and Institute of Chemistry, University of Copenhagen, Copenhagen, Denmark
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39
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Geitner NK, Powell RR, Bruce T, Ladner DA, Ke PC. Effects of dendrimer oil dispersants on Dictyostelium discoideum. RSC Adv 2013. [DOI: 10.1039/c3ra43953d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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40
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Bhattacharya P, Geitner NK, Sarupria S, Ke PC. Exploiting the physicochemical properties of dendritic polymers for environmental and biological applications. Phys Chem Chem Phys 2013; 15:4477-90. [DOI: 10.1039/c3cp44591g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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