1
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Yamada T, Miyazaki Y, Harada S, Kumar A, Vanni S, Shinoda W. Improved Protein Model in SPICA Force Field. J Chem Theory Comput 2023; 19:8967-8977. [PMID: 37989551 DOI: 10.1021/acs.jctc.3c01016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
The previous version of the SPICA coarse-grained (CG) force field (FF) protein model focused primarily on membrane proteins and successfully reproduced the dimerization free energies of several transmembrane helices and the stable structures of various membrane protein assemblies. However, that model had limited accuracy when applied to other proteins, such as intrinsically disordered proteins (IDPs) and peripheral proteins, because the dimensions of the IDPs in an aqueous solution were too compact, and protein binding on the lipid membrane surface was overstabilized. To improve the accuracy of the SPICA FF model for the simulation of such systems, in this study, we introduce protein secondary structure-dependent nonbonded interaction parameters to the backbone segments and reoptimize almost all nonbonded parameters for amino acids. The improved FF proposed here successfully reproduces the radii of gyration of various IDPs, the binding sensitivity of several peripheral membrane proteins, and the dimerization free energies of several transmembrane helices. The new model also shows improved agreement with experiments on the free energy of peptide association in water. In addition, an extensive library of nonbonded interactions between proteins and lipids, including various glycerophospholipids, sphingolipids, and cholesterol, allows the study of specific interactions between lipids and peripheral and transmembrane proteins. Hence, the new SPICA FF (version 2) proposed herein is applicable with high accuracy for simulating a wide range of protein systems.
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Affiliation(s)
- Teppei Yamada
- Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Yusuke Miyazaki
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Shogo Harada
- Department of Materials Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Ashutosh Kumar
- Department of Biology and National Center of Competence in Research Bio-inspired Materials, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
| | - Stefano Vanni
- Department of Biology and National Center of Competence in Research Bio-inspired Materials, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
| | - Wataru Shinoda
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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2
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Sriwidodo, Umar AK, Wathoni N, Zothantluanga JH, Das S, Luckanagul JA. Liposome-polymer complex for drug delivery system and vaccine stabilization. Heliyon 2022; 8:e08934. [PMID: 35243059 PMCID: PMC8861389 DOI: 10.1016/j.heliyon.2022.e08934] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 01/25/2022] [Accepted: 02/08/2022] [Indexed: 12/18/2022] Open
Abstract
Liposomes have been used extensively as micro- and nanocarriers for hydrophobic or hydrophilic molecules. However, conventional liposomes are biodegradable and quickly eliminated, making it difficult to be used for delivery in specific routes, such as the oral and systemic routes. One way to overcome this problem is through complexation with polymers, which is referred to as a liposome complex. The use of polymers can increase the stability of liposome with regard to pH, chemicals, enzymes, and the immune system. In some cases, specific polymers can condition the properties of liposomes to be explicitly used in drug delivery, such as targeted delivery and controlled release. These properties are influenced by the type of polymer, crosslinker, interaction, and bond in the complexation process. Therefore, it is crucial to study and review these parameters for the development of more optimal forms and properties of the liposome complex. This article discusses the use of natural and synthetic polymers, ways of interaction between polymers and liposomes (on the surface, incorporation in lamellar chains, and within liposomes), types of bonds, evaluation standards, and their effects on the stability and pharmacokinetic profile of the liposome complex, drugs, and vaccines. This article concludes that both natural and synthetic polymers can be used in modifying the structure and physicochemical properties of liposomes to specify their use in targeted delivery, controlled release, and stabilizing drugs and vaccines.
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Affiliation(s)
- Sriwidodo
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jatinangor 45363, Indonesia
| | - Abd. Kakhar Umar
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jatinangor 45363, Indonesia
- Department of Pharmaceutical Sciences and Technology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Nasrul Wathoni
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jatinangor 45363, Indonesia
| | - James H. Zothantluanga
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786004, Assam, India
| | - Sanjoy Das
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786004, Assam, India
| | - Jittima Amie Luckanagul
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
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3
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Antosiewicz JM, Długosz M. Constant-pH Brownian Dynamics Simulations of a Protein near a Charged Surface. ACS OMEGA 2020; 5:30282-30298. [PMID: 33251463 PMCID: PMC7689933 DOI: 10.1021/acsomega.0c04817] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/04/2020] [Indexed: 05/04/2023]
Abstract
We have developed a rigid-body Brownian dynamics algorithm that allows for simulations of a globular protein suspended in an ionic solution confined by a charged planar boundary, with an explicit treatment of pH-dependent protein protonation equilibria and their couplings to the electrostatic potential of the plane. Electrostatic interactions are described within a framework of the continuum Poisson-Boltzmann model, whereas protein-plane hydrodynamic interactions are evaluated based on analytical expressions for the position- and orientation-dependent near-wall friction tensor of a spheroid. The algorithm was applied to simulate near-surface diffusion of lysozyme in solutions having pH in the range 4-10 and ionic strengths of 10 and 150 mM. As a reference, we performed Brownian dynamics simulations in which the protein is assigned a fixed, most probable protonation state, appropriate for given solution conditions and unaffected by the presence of the charged plane, and Brownian dynamics simulations in which the protein probes possible protonation states with the pH-dependent probability, but these variations are not coupled to the electric field generated by the boundary. We show that electrostatic interactions with the negatively charged plane substantially modify probabilities of different protonation states of lysozyme and shift protonation equilibria of both acidic and basic amino acid side chains toward higher pH values. Consequently, equilibrium energy distributions, equilibrium position-orientation distributions, and functions that characterize rotational dynamics, which for a protein with multiple ionization sites, such as lysozyme, in the presence of a charged obstacle are pH-dependent, are significantly affected by the approach taken to incorporate the solution pH into simulations.
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4
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Suleiman E, Mayer J, Lehner E, Kohlhauser B, Katholnig A, Batzoni M, Damm D, Temchura V, Wagner A, Überla K, Vorauer-Uhl K. Conjugation of Native-Like HIV-1 Envelope Trimers onto Liposomes Using EDC/Sulfo-NHS Chemistry: Requirements and Limitations. Pharmaceutics 2020; 12:E979. [PMID: 33081278 PMCID: PMC7589475 DOI: 10.3390/pharmaceutics12100979] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/13/2020] [Accepted: 10/13/2020] [Indexed: 12/29/2022] Open
Abstract
The display of native-like human immunodeficiency virus type 1 envelope (HIV-1 Env) trimers on liposomes has gained wide attention over the last few years. Currently, available methods have enabled the preparation of Env-liposome conjugates of unprecedented quality. However, these protocols require the Env trimer to be tagged and/or to carry a specific functional group. For this reason, we have investigated N-(3-Dimethylaminopropyl)-N'-ethylcarbodiimide/N-Hydroxysulfosuccinimide (EDC/Sulfo-NHS) chemistry for its potential to covalently conjugate tag-free, non-functionalized native-like Env trimers onto the surface of carboxyl-functionalized liposomes. The preservation of the liposome's physical integrity and the immunogen's conformation required a fine-tuned two-step approach based on the controlled use of β-mercaptoethanol. The display of Env trimers was strictly limited to activated liposomes of positive charge, i.e., liposomes with a positive zeta potential that carry amine-reactive Sulfo-NHS esters on their surface. In agreement with that, conjugation was found to be highly ionic strength- and pH-dependent. Overall, we have identified electrostatic pre-concentration (i.e., close proximity between negatively charged Env trimers and positively charged liposomes established through electrostatic attraction) to be crucial for conjugation reactions to proceed. The present study highlights the requirements and limitations of potentially scalable EDC/Sulfo-NHS-based approaches and represents a solid basis for further research into the controlled conjugation of tag-free, non-functionalized native-like Env trimers on the surface of liposomes, and other nanoparticles.
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Affiliation(s)
- Ehsan Suleiman
- Polymun Scientific Immunbiologische Forschung GmbH, 3400 Klosterneuburg, Austria;
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
| | - Julia Mayer
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
| | - Elisabeth Lehner
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
| | - Bianca Kohlhauser
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
- University of Vienna, 1010 Vienna, Austria
| | - Alexandra Katholnig
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
| | - Mirjam Batzoni
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
- FH Campus Wien, University of Applied Sciences, 1100 Vienna, Austria
| | - Dominik Damm
- Institute of Clinical and Molecular Virology, Universitätsklinikum Erlangen, 91054 Erlangen, Germany; (D.D.); (V.T.); (K.Ü.)
| | - Vladimir Temchura
- Institute of Clinical and Molecular Virology, Universitätsklinikum Erlangen, 91054 Erlangen, Germany; (D.D.); (V.T.); (K.Ü.)
| | - Andreas Wagner
- Polymun Scientific Immunbiologische Forschung GmbH, 3400 Klosterneuburg, Austria;
| | - Klaus Überla
- Institute of Clinical and Molecular Virology, Universitätsklinikum Erlangen, 91054 Erlangen, Germany; (D.D.); (V.T.); (K.Ü.)
| | - Karola Vorauer-Uhl
- Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria; (J.M.); (E.L.); (B.K.); (A.K.); (M.B.); (K.V.-U.)
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5
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Wholey WY, Mueller JL, Tan C, Brooks JF, Zikherman J, Cheng W. Synthetic Liposomal Mimics of Biological Viruses for the Study of Immune Responses to Infection and Vaccination. Bioconjug Chem 2020; 31:685-697. [PMID: 31940172 DOI: 10.1021/acs.bioconjchem.9b00825] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Human viruses possess very complex supramolecular structures. Both icosahedral and enveloped viruses typically display an array of viral-encoded protein antigens at varied spatial densities on the viral particle surface. The viral nucleic acid genome, on the other hand, is encapsulated inside the viral particle. Although both the surface antigen and the interior nucleic acids could independently produce immunological responses, how B cells integrate these two types of signals and respond to a typical virus particle to initiate activation is not well understood at a molecular level. The study of these fundamental biological processes would benefit from the development of viral structural mimics that are well constructed to incorporate both quantitative and qualitative viral features for presentation to B cells. These novel tools would enable researchers to systematically dissect the underlying processes. Here we report the development of such particulate antigens based on liposomes engineered to display a model protein antigen, hen egg lysozyme (HEL). We developed methods to overexpress and purify various affinity mutants of HEL from E. coli. We conjugated the purified recombinant HEL proteins onto the surface of a virion-sized liposome in an orientation-specific manner at defined spatial densities and also encapsulated nucleic acid molecules into the interior of the liposome. Both the chemical conjugation of the HEL antigen on liposome surfaces and the encapsulation of nucleic acids were stable under physiologically relevant conditions. These liposomes elicited antigen-specific B-cell responses in vitro, which validate these supramolecular structures as a novel and effective approach to mimic and systematically isolate the role of essential viral features in directing the B-cell response to particulate antigens.
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Affiliation(s)
- Wei-Yun Wholey
- Department of Pharmaceutical Sciences, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109, United States
| | - James L Mueller
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, California 94143, United States
| | - Corey Tan
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, California 94143, United States
| | - Jeremy F Brooks
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, California 94143, United States
| | - Julie Zikherman
- Division of Rheumatology, Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Department of Medicine, University of California, San Francisco, California 94143, United States
| | - Wei Cheng
- Department of Pharmaceutical Sciences, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109, United States.,Department of Biological Chemistry, University of Michigan Medical School, 1150 West Medical Center Drive, Ann Arbor, Michigan 48109, United States
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6
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Al-Shabib NA, Khan JM, Malik A, Sen P, Ramireddy S, Chinnappan S, Alamery SF, Husain FM, Ahmad A, Choudhry H, Khan MI, Shahzad SA. Allura red rapidly induces amyloid-like fibril formation in hen egg white lysozyme at physiological pH. Int J Biol Macromol 2019; 127:297-305. [DOI: 10.1016/j.ijbiomac.2019.01.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 01/10/2019] [Accepted: 01/11/2019] [Indexed: 12/30/2022]
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7
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Mandal A, Boatz JC, Wheeler TB, van der Wel PCA. On the use of ultracentrifugal devices for routine sample preparation in biomolecular magic-angle-spinning NMR. JOURNAL OF BIOMOLECULAR NMR 2017; 67:165-178. [PMID: 28229262 PMCID: PMC5445385 DOI: 10.1007/s10858-017-0089-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 01/19/2017] [Indexed: 05/07/2023]
Abstract
A number of recent advances in the field of magic-angle-spinning (MAS) solid-state NMR have enabled its application to a range of biological systems of ever increasing complexity. To retain biological relevance, these samples are increasingly studied in a hydrated state. At the same time, experimental feasibility requires the sample preparation process to attain a high sample concentration within the final MAS rotor. We discuss these considerations, and how they have led to a number of different approaches to MAS NMR sample preparation. We describe our experience of how custom-made (or commercially available) ultracentrifugal devices can facilitate a simple, fast and reliable sample preparation process. A number of groups have since adopted such tools, in some cases to prepare samples for sedimentation-style MAS NMR experiments. Here we argue for a more widespread adoption of their use for routine MAS NMR sample preparation.
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Affiliation(s)
- Abhishek Mandal
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15260, USA
| | - Jennifer C Boatz
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15260, USA
| | - Travis B Wheeler
- Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15260, USA
| | - Patrick C A van der Wel
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15260, USA.
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8
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Ohno M, Toyota T, Nomoto T, Fujinami M. Interfacial tension in adsorption of lysozyme onto a lipid monolayer formed at a water/chloroform interface. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Hennig R, Heidrich J, Saur M, Schmüser L, Roeters SJ, Hellmann N, Woutersen S, Bonn M, Weidner T, Markl J, Schneider D. IM30 triggers membrane fusion in cyanobacteria and chloroplasts. Nat Commun 2015; 6:7018. [DOI: 10.1038/ncomms8018] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 03/25/2015] [Indexed: 02/07/2023] Open
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10
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Derde M, Nau F, Guérin-Dubiard C, Lechevalier V, Paboeuf G, Jan S, Baron F, Gautier M, Vié V. Native and dry-heated lysozyme interactions with membrane lipid monolayers: Lipid packing modifications of a phospholipid mixture, model of the Escherichia coli cytoplasmic membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1065-73. [PMID: 25615689 DOI: 10.1016/j.bbamem.2015.01.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 01/05/2015] [Accepted: 01/11/2015] [Indexed: 11/17/2022]
Abstract
Antimicrobial resistance is currently an important public health issue. The need for innovative antimicrobials is therefore growing. The ideal antimicrobial compound should limit antimicrobial resistance. Antimicrobial peptides or proteins such as hen egg white lysozyme are promising molecules that act on bacterial membranes. Hen egg white lysozyme has recently been identified as active on Gram-negative bacteria due to disruption of the outer and cytoplasmic membrane integrity. Furthermore, dry-heating (7 days and 80 °C) improves the membrane activity of lysozyme, resulting in higher antimicrobial activity. These in vivo findings suggest interactions between lysozyme and membrane lipids. This is consistent with the findings of several other authors who have shown lysozyme interaction with bacterial phospholipids such as phosphatidylglycerol and cardiolipin. However, until now, the interaction between lysozyme and bacterial cytoplasmic phospholipids has been in need of clarification. This study proposes the use of monolayer models with a realistic bacterial phospholipid composition in physiological conditions. The lysozyme/phospholipid interactions have been studied by surface pressure measurements, ellipsometry and atomic force microscopy. Native lysozyme has proved able to absorb and insert into a bacterial phospholipid monolayer, resulting in lipid packing reorganization, which in turn has lead to lateral cohesion modifications between phospholipids. Dry-heating of lysozyme has increased insertion capacity and ability to induce lipid packing modifications. These in vitro findings are then consistent with the increased membrane disruption potential of dry heated lysozyme in vivo compared to native lysozyme. Moreover, an eggPC monolayer study suggested that lysozyme/phospholipid interactions are specific to bacterial cytoplasmic membranes.
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Affiliation(s)
- Melanie Derde
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France.
| | - Françoise Nau
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Catherine Guérin-Dubiard
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Valérie Lechevalier
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Gilles Paboeuf
- Université de Rennes 1, Institut de physique de Rennes, UMR6251, CNRS, F-35042 Rennes, France
| | - Sophie Jan
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Florence Baron
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Michel Gautier
- Agrocampus Ouest, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France; INRA, UMR1253 Science et technologie du lait et de l'œuf, F-35042 Rennes, France
| | - Véronique Vié
- Université de Rennes 1, Institut de physique de Rennes, UMR6251, CNRS, F-35042 Rennes, France
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11
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Wagener V, Faltz AS, Killian MS, Schmuki P, Virtanen S. Protein interactions with corroding metal surfaces: comparison of Mg and Fe. Faraday Discuss 2015; 180:347-60. [DOI: 10.1039/c4fd00253a] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of bovine serum albumin (BSA) on the electrochemical behaviour of pure Mg and Fe was studied in simulated body fluid (SBF), in view of the possible application of these materials as biodegradable metals. Results indicate a different trend for the BSA-effect on corrosion for the two metals: for Mg, a strong corrosion-inhibiting effect is observed in the presence of BSA in solution, especially for short-term exposure, whereas for Fe only a slight acceleration of corrosion is caused by the addition of BSA to the solution. For both metals, the protein-effect on the electrochemical behaviour shows a complex time-dependence. Surface analysis indicates that stronger BSA adsorption takes place on Mg than on Fe. Moreover, adsorption experiments with BSA and a second protein (lysozyme) were conducted. The results are discussed in view of electrostatic interactions between differently charged metal oxide/hydroxide surfaces and proteins.
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Affiliation(s)
- Victoria Wagener
- Institute for Surface Science and Corrosion
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - Anne-Sophie Faltz
- Institute for Surface Science and Corrosion
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - Manuela S. Killian
- Institute for Surface Science and Corrosion
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - Patrik Schmuki
- Institute for Surface Science and Corrosion
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - Sannakaisa Virtanen
- Institute for Surface Science and Corrosion
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
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12
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Rzeźnicka II, Pandey R, Schleeger M, Bonn M, Weidner T. Formation of lysozyme oligomers at model cell membranes monitored with sum frequency generation spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7736-7744. [PMID: 24941083 DOI: 10.1021/la5010227] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A growing number of studies suggest that the formation of toxic oligomers, precursors of amyloid fibrils, is initiated at the cell membrane and not in the cytosolic compartments of the cell. Studies of membrane-induced protein oligomerization are challenging due to the difficulties of probing small numbers of proteins present at membrane surfaces. Here, we employ surface-sensitive vibrational sum frequency generation (VSFG) to investigate the secondary structure of lysozyme at the surface of lipid monolayers. We investigate lysozyme aggregation at negatively charged 1,2-dipalmitoyl-sn-glycero-3-(phospho-rac-1-glycerol) (DPPG) lipid monolayers under different pH conditions. The changes in the molecular vibrations of lipids, proteins, and water as a function of pH and surface pressure allow us to simultaneously monitor details of the conformation state of lysozyme, the organization of lipids, and the state of lipid-bound water. At pH = 6 lysozyme induces significant disordering of the lipid layer, and it exists in two states: a monomeric state with a predominantly α-helix content and an oligomeric (za-mer) state. At pH ≤ 3, all membrane-bound lysozyme self-associates into oligomers characterized by an antiparallel β-sheet structure. This is different from the situation in bulk solution, for which circular dichroism (CD) shows that the protein maintains an α-helix conformation, under both neutral and acidic pH conditions. The transition from monomers to oligomers is also associated with a decreased hydration of the lipid monolayer resulting in an increase of the lipid acyl chains ordering. The results indicate that oligomerization requires cooperative action between lysozyme incorporated into the lipid membrane and peripherally adsorbed lysozyme and is associated with the membrane dehydration and lipid reorganization. Membrane-bound oligomers with antiparallel β-sheet structure are found to destabilize lipid membranes.
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Affiliation(s)
- I I Rzeźnicka
- Department of Chemistry, Graduate School of Science, 6-3 Aramaki Aza-Aoba, Aoba-ku, Tohoku University , Sendai, Japan
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13
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Stangl M, Hemmelmann M, Allmeroth M, Zentel R, Schneider D. A Minimal Hydrophobicity Is Needed To Employ Amphiphilic p(HPMA)-co-p(LMA) Random Copolymers in Membrane Research. Biochemistry 2014; 53:1410-9. [DOI: 10.1021/bi401611f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Stangl
- Institut
für Pharmazie und Biochemie, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 30, 55128 Mainz, Germany
| | - Mirjam Hemmelmann
- Institut
für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Mareli Allmeroth
- Institut
für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Rudolf Zentel
- Institut
für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Dirk Schneider
- Institut
für Pharmazie und Biochemie, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 30, 55128 Mainz, Germany
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14
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Melo AM, Loura LMS, Fernandes F, Villalaín J, Prieto M, Coutinho A. Electrostatically driven lipid-lysozyme mixed fibers display a multilamellar structure without amyloid features. SOFT MATTER 2014; 10:840-850. [PMID: 24651998 DOI: 10.1039/c3sm52586d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Understanding the interactions between anionic lipid membranes and amyloidogenic proteins/peptides is key to elucidate the molecular mechanisms underlying the membrane-driven amyloid fiber formation. Here, hen egg-white lysozyme was used as a model protein to test whether this same process also occurs with non-amyloidogenic lipid-binding proteins/peptides. A complementary set of biophysical techniques was employed to study the structure and dynamics of the lipid-lysozyme mixed fibers produced at a low lipid/protein molar ratio that have been proposed earlier to present "amyloid-like" characteristics. The multilamellar architecture of these elongated mesoscopic structures was established by performing time-resolved Förster resonance energy transfer measurements, at both bulk (ensemble) and single-fiber level. The predominantly oligomeric lysozyme and phospholipids were both found to display significantly decreased lateral mobility when embedded in these mixed fibers. Notably, two-photon microscopy of Laurdan revealed that a pronounced membrane surface dehydration/increased molecular interfacial packing was produced exclusively in these elongated mixed supramolecular fibers present in the highly polymorphic samples. Infrared spectroscopic studies of lysozyme in these samples further showed that this protein did not exhibit a rich β-sheet structure characteristic of amyloid fibrils. These results support the conclusion that negatively charged lipid membranes do not have the general ability to trigger amyloid fibril formation of non-amyloidogenic proteins.
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Affiliation(s)
- Ana M Melo
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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15
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Das A, Thakur R, Dagar A, Chakraborty A. A spectroscopic investigation and molecular docking study on the interaction of hen egg white lysozyme with liposomes of saturated and unsaturated phosphocholines probed by an anticancer drug ellipticine. Phys Chem Chem Phys 2014; 16:5368-81. [DOI: 10.1039/c3cp54247e] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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16
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Myrnes B, Seppola M, Johansen A, Overbø K, Callewaert L, Vanderkelen L, Michiels CW, Nilsen IW. Enzyme characterisation and gene expression profiling of Atlantic salmon chicken- and goose-type lysozymes. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2013; 40:11-19. [PMID: 23396098 DOI: 10.1016/j.dci.2013.01.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2012] [Revised: 01/13/2013] [Accepted: 01/14/2013] [Indexed: 06/01/2023]
Abstract
Lysozymes represent important innate immune components against bacteria. In this study, Atlantic salmon (Salmo salar) goose (g-) and chicken (c-) types of lysozyme were subjected to protein characterisations and tissue expression analyses. Specific bacterial protein inhibitors of g- and c-type lysozymes were employed to discriminate between respective enzyme activities. Blood, gills and liver contained activities exclusive for the g-type lysozyme. Only haematopoietic organs (head kidney and spleen) contained enzyme activities of both g- and c-lysozyme enzymes and c-type activity was not found outside these organs. Gene transcript levels proportional to enzyme activity levels were detected for the g-type lysozyme but not for the c-type. In vitro studies revealed significant induction of c-type gene expression and enzyme activity in macrophages after incubation with lipopolysaccharide (LPS) while expression of the g-type lysozyme gene was unaffected. The activity of purified native c-type enzyme was profoundly reduced by divalent cations and displayed low tolerance to monovalent cations, while the native g-type lysozyme was stimulated by monovalent cations and tolerated low concentrations of divalent cations. Activities of both enzymes increased with temperature elevations up to 60°C. The native g-type lysozyme responses to temperature in particular are in apparent conflict to the ones for the recombinant salmon g-lysozyme. Our results imply separate expression regulations and different functions of c- and g-type lysozymes in salmon. LPS-induced expression of c-type lysozyme and broad constitutive tissue distribution of g-type lysozyme in salmon is different from findings in other studied fish species.
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Affiliation(s)
- Bjørnar Myrnes
- Marine Biotechnology, Nofima, Muninbakken 9-13, 9291 Tromsø, Norway
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17
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Melo AM, Ricardo JC, Fedorov A, Prieto M, Coutinho A. Fluorescence Detection of Lipid-Induced Oligomeric Intermediates Involved in Lysozyme “Amyloid-Like” Fiber Formation Driven by Anionic Membranes. J Phys Chem B 2013; 117:2906-17. [DOI: 10.1021/jp310396v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ana M. Melo
- Centro de Química-Física
Molecular and Institute of Nanoscience and Nanotechnology, I.S.T, Universidade Técnica de Lisboa, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Joana C. Ricardo
- Centro de Química-Física
Molecular and Institute of Nanoscience and Nanotechnology, I.S.T, Universidade Técnica de Lisboa, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Aleksander Fedorov
- Centro de Química-Física
Molecular and Institute of Nanoscience and Nanotechnology, I.S.T, Universidade Técnica de Lisboa, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Manuel Prieto
- Centro de Química-Física
Molecular and Institute of Nanoscience and Nanotechnology, I.S.T, Universidade Técnica de Lisboa, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
| | - Ana Coutinho
- Centro de Química-Física
Molecular and Institute of Nanoscience and Nanotechnology, I.S.T, Universidade Técnica de Lisboa, Av. Rovisco
Pais, 1049-001 Lisboa, Portugal
- Dep. Química e Bioquímica, FCUL, Campo Grande, 1749-016 Lisboa, Portugal
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18
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Flach K, Hilbrich I, Schiffmann A, Gärtner U, Krüger M, Leonhardt M, Waschipky H, Wick L, Arendt T, Holzer M. Tau oligomers impair artificial membrane integrity and cellular viability. J Biol Chem 2012; 287:43223-33. [PMID: 23129775 DOI: 10.1074/jbc.m112.396176] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The microtubule-associated protein Tau is mainly expressed in neurons, where it binds and stabilizes microtubules. In Alzheimer disease and other tauopathies, Tau protein has a reduced affinity toward microtubules. As a consequence, Tau protein detaches from microtubules and eventually aggregates into β-sheet-containing filaments. The fibrillization of monomeric Tau to filaments is a multistep process that involves the formation of various aggregates, including spherical and protofibrillar oligomers. Previous concepts, primarily developed for Aβ and α-synuclein, propose these oligomeric intermediates as the primary cytotoxic species mediating their deleterious effects through membrane permeabilization. In the present study, we thus analyzed whether this concept can also be applied to Tau protein. To this end, viability and membrane integrity were assessed on SH-SY5Y neuroblastoma cells and artificial phospholipid vesicles, treated with Tau monomers, Tau aggregation intermediates, or Tau fibrils. Our findings suggest that oligomeric Tau aggregation intermediates are the most toxic compounds of Tau fibrillogenesis, which effectively decrease cell viability and increase phospholipid vesicle leakage. Our data integrate Tau protein into the class of amyloidogenic proteins and enforce the hypothesis of a common toxicity-mediating mechanism for amyloidogenic proteins.
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Affiliation(s)
- Katharina Flach
- Department of Molecular and Cellular Mechanisms of Neurodegeneration, Paul Flechsig Institute of Brain Research, Faculty of Medicine, Jahnallee 59, University of Leipzig, 04109 Leipzig, Germany
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Witoonsaridsilp W, Panyarachun B, Jaturanpinyo M, Sarisuta N. Phospholipid vesicle-bound lysozyme to enhance permeability in human intestinal cells. Pharm Dev Technol 2012; 18:821-7. [PMID: 22762545 DOI: 10.3109/10837450.2012.700930] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Oral peptide and protein drug delivery still remain the area of challenges for pharmaceutical scientists due to their low stability and permeability in gastrointestinal (GI) tract. In this study phospholipid vesicle-bound lysozyme were prepared and assessed for their physicochemical properties, secondary structure, and permeation across Caco-2 cells. RESULTS Lysozyme was found to be substantially bound onto negatively charged vesicles via electrostatic interaction as evidenced by zeta potential measurements regardless of cholesterol content. In contrast, the size of phospholipid vesicle-bound lysozyme became larger with the increasing cholesterol content. The secondary structure of vesicle-bound lysozyme examined by FTIR was unchanged compared to that in buffer solution. The apparent permeability of vesicle-bound lysozyme across Caco-2 cells monolayer was significantly enhanced with a size dependent manner compared to that of solution. CONCLUSION The permeation across Caco-2 cell monolayers of phospholipid vesicle-bound lysozyme was demonstrated to be significantly enhanced with a size-dependent manner.
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Affiliation(s)
- Wasu Witoonsaridsilp
- Department of Manufacturing Pharmacy, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
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20
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Modulation of physiological and pathological activities of lysozyme by biological membranes. Cell Mol Biol Lett 2012; 17:349-75. [PMID: 22544762 PMCID: PMC6275811 DOI: 10.2478/s11658-012-0015-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 04/18/2012] [Indexed: 11/21/2022] Open
Abstract
The molecular details of interactions between lipid membranes and lysozyme (Lz), a small polycationic protein with a wide range of biological activities, have long been the focus of numerous studies. The biological consequences of this process are considered to embrace at least two aspects: i) correlation between antimicrobial and membranotropic properties of this protein, and ii) lipid-mediated Lz amyloidogenesis. The mechanisms underlying the lipid-assisted protein fibrillogenesis and membrane disruption exerted by Lz in bacterial cells are believed to be similar. The present investigation was undertaken to gain further insight into Lz-lipid interactions and explore the routes by which Lz exerts its antimicrobial and amyloidogenic actions. Binding and Förster resonance energy transfer studies revealed that upon increasing the content of anionic lipids in lipid vesicles, Lz forms aggregates in a membrane environment. Total internal reflection fluorescence microscopy and pyrene excimerization reaction were employed to study the effect of Lz on the structural and dynamic properties of lipid bilayers. It was found that Lz induces lipid demixing and reduction of bilayer free volume, the magnitude of this effect being much more pronounced for oligomeric protein.
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21
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Hirano A, Yoshikawa H, Matsushita S, Yamada Y, Shiraki K. Adsorption and disruption of lipid bilayers by nanoscale protein aggregates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3887-3895. [PMID: 22276744 DOI: 10.1021/la204717c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nanoparticles taken into biological systems can have biological impacts through their interactions with cell membranes, accompanied by protein adsorption onto the nanoparticle surfaces, forming a so-called protein corona. Our current research aims to demonstrate that nanoscale protein aggregates behave like such nanoparticles with regard to the interaction with lipid membranes. In this study, the adsorption and disruption of the lipid membranes by protein aggregates were investigated using amyloid fibrils and nanoscale thermal aggregates of lysozyme. Both types of protein aggregates had disruptive effects on the negatively charged liposomes, similar to polycationic nanoparticles. Interestingly, adsorption of liposomes on the amyloid fibrils preceding disruption occurred even if the net charge of the liposome was zero, suggesting the importance of hydrophobic interactions in addition to electrostatic interactions. The results of the present study provide new insights into the biological impacts of nanoparticles in vivo.
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Affiliation(s)
- Atsushi Hirano
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562, Japan
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22
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Strobach S, Kunert R, Stadlmann J, Messner P, Sevcsik E, Lhota G, Katinger H, Vorauer-Uhl K. Topological transformation of liposomes by a membrane-affecting domain of recombinant human erythropoietin. J Liposome Res 2010; 20:24-30. [PMID: 19522661 DOI: 10.3109/08982100903015033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Recombinant human erythropoietin (rh-Epo) is well accepted as a hematopoietic drug, but many other pleiotropic properties are currently under investigation. Rh-Epo-induced receptor-mediated signal transductions are accompanied with membrane dynamic processes, which facilitate the activation of individual pathways. However, its direct effect on membrane dynamics is still unknown. In the present study, we have proven the capability of rh-Epo to associate to and transform artificial lipid membranes. Association studies using neutral, negatively, and positively charged liposomes with the native as well as modified rh-Epo were performed and analyzed by transmission electron microscopy and differential scanning calorimetry. By these studies, we demonstrated that rh-Epo has the capability to transform negatively charged unilamellar vesicles into so-called disc-like micelles. Rh-Epo association to the negatively charged head groups via lysine and arginine initiates this transformation. At physiological temperatures, conformational changes within the rh-Epo structure expose a defined amino-acid sequence, which is able to induce the formation of discoid membrane structures. Enzymatic digestion, analysis, and isolation of related peptides by rp-HPLC and characterization by MS/MS enabled the identification of the membrane-affecting domain of rh-Epo (MAD-E) that represents the exposed helix B of rh-Epo. Finally, association studies performed with these peptides confirmed that the MAD-E is responsible for the formation of disc-like micelles. Since this helix B of rh-Epo has recently been supposed to be involved in the activation of neuroprotective pathways, we believe that the membrane-transforming capacity of rh-Epo participates in the proliferative activity of rh-Epo.
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Affiliation(s)
- Stefanie Strobach
- Department of Biotechnology, University of Natural Resources and Applied Life Sciences, Vienna, Austria.
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23
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Witoonsaridsilp W, Panyarachun B, Sarisuta N, Müller-Goymann CC. Influence of microenvironment and liposomal formulation on secondary structure and bilayer interaction of lysozyme. Colloids Surf B Biointerfaces 2010; 75:501-9. [DOI: 10.1016/j.colsurfb.2009.09.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 09/04/2009] [Accepted: 09/22/2009] [Indexed: 10/20/2022]
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24
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Le Brun V, Friess W, Schultz-Fademrecht T, Muehlau S, Garidel P. Lysozyme-lysozyme self-interactions as assessed by the osmotic second virial coefficient: Impact for physical protein stabilization. Biotechnol J 2009; 4:1305-19. [DOI: 10.1002/biot.200800274] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Chaudhary N, Nagaraj R. Hen lysozyme amyloid fibrils induce aggregation of erythrocytes and lipid vesicles. Mol Cell Biochem 2009; 328:209-15. [DOI: 10.1007/s11010-009-0091-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 03/11/2009] [Indexed: 11/30/2022]
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26
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Brgles M, Jurašin D, Sikirić MD, Frkanec R, Tomašić J. Entrapment of Ovalbumin into Liposomes—Factors Affecting Entrapment Efficiency, Liposome Size, and Zeta Potential. J Liposome Res 2008; 18:235-48. [DOI: 10.1080/08982100802312762] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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27
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Pinched multilamellar structure of aggregates of lysozyme and phosphatidylserine-containing membranes revealed by FRET. Biophys J 2008; 95:4726-36. [PMID: 18658231 DOI: 10.1529/biophysj.108.134379] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Electrostatic interactions between negatively charged membranes and basic peptides/protein domains have been implicated as the driving force for several important processes, often involving membrane aggregation, fusion, or phase separation. Recently, acidic lipids were reported to both catalyze amyloid fiber formation by amyloidogenic proteins/peptides and induce formation of "amyloid-like" fibrils by nonamyloidogenic proteins. This study aims to characterize the structure of the aggregates of a basic protein (lysozyme) and negatively charged membranes (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine/1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoserine 4:1 mixture) at the molecular level, using Förster resonance energy transfer. It is concluded that lysozyme induced formation of a "pinched lamellar" structure, with reduced interbilayer distance in the regions where there is bound protein and increased interbilayer distance (stabilized by hydration repulsion) outside these areas.
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28
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Gorbenko GP, Ioffe VM, Molotkovsky JG, Kinnunen PK. Resonance energy transfer study of lysozyme–lipid interactions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1213-21. [DOI: 10.1016/j.bbamem.2007.09.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 09/06/2007] [Accepted: 09/17/2007] [Indexed: 11/24/2022]
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29
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Charge-directed targeting of antimicrobial protein-nanoparticle conjugates. Biotechnol Bioeng 2008; 100:403-12. [DOI: 10.1002/bit.21782] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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Silletti E, Vingerhoeds MH, Norde W, van Aken GA. Complex formation in mixtures of lysozyme-stabilized emulsions and human saliva. J Colloid Interface Sci 2007; 313:485-93. [PMID: 17574261 DOI: 10.1016/j.jcis.2007.05.030] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Revised: 05/01/2007] [Accepted: 05/02/2007] [Indexed: 10/23/2022]
Abstract
In this paper, we studied the interaction between human unstimulated saliva and lysozyme-stabilized oil-in-water emulsions (10 wt/wt% oil phase, 10 mM NaCl, pH 6.7), to reveal the driving force for flocculation of these emulsions. Confocal scanning laser microscopy (CSLM) showed formation of complexes between salivary proteins and lysozyme adsorbed at the oil-water interface and lysozyme in solution as well. To assess the electrostatic nature of the interaction in emulsion/saliva mixtures, laser-diffraction and rheological measurements were conducted in function of the ionic strength by adding NaCl to the mixture in the range between 0 and 168 mM. Increasing the ionic strength reduced the ability of saliva to induce emulsion flocculation as shown by the decreased floc size and the effect on the viscosity. Turbidity experiments with varying pH (3-7) and ionic strength also showed decreased complex formation in mixtures between saliva and lysozyme in solution upon NaCl addition up to 200 mM. Decreasing the pH increased the turbidity, in line with the increase of the positive net charge on the lysozyme molecule. We conclude that electrostatic attraction is the main driving force for complex formation between saliva components and lysozyme adsorbed at the oil droplets and in solution.
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Affiliation(s)
- Erika Silletti
- Wageningen Centre for Food Sciences, PO Box 557, 6700 AN Wageningen, The Netherlands
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31
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Ioffe VM, Gorbenko GP, Deligeorgiev T, Gadjev N, Vasilev A. Fluorescence study of protein–lipid complexes with a new symmetric squarylium probe. Biophys Chem 2007; 128:75-86. [PMID: 17383795 DOI: 10.1016/j.bpc.2007.03.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Revised: 03/03/2007] [Accepted: 03/06/2007] [Indexed: 12/31/2022]
Abstract
The novel symmetric squarylium derivative SQ-1 has been synthesized and tested for its sensitivity to the formation of protein-lipid complexes. SQ-1 binding to the model membranes composed of zwitterionic lipid phosphatidylcholine (PC) and its mixtures with anionic lipid cardiolipin (CL) in different molar ratios was found to be controlled mainly by hydrophobic interactions. Lysozyme (Lz) and ribonuclease A (RNase) exerted an influence on the probe association with lipid vesicles resulting presumably from the competition between SQ-1 and the proteins for bilayer free volume and modification of its properties. The magnitude of this effect was much higher for lysozyme which may stem from the amphipathy of protein alpha-helix involved in the membrane binding. Varying membrane composition provides evidence for the dye sensitivity to both hydrophobic and electrostatic protein-lipid interactions. Fluorescence anisotropy studies uncovered the restriction of SQ-1 rotational mobility in lipid environment in the presence of Lz and RNase being indicative of the incorporation of the proteins into bilayer interior. The results of binding, fluorescence quenching and kinetic experiments suggested lysozyme-induced local lipid demixing upon protein association with negatively charged membranes with threshold concentration of CL for the lipid demixing being 10 mol%.
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Affiliation(s)
- Valeriya M Ioffe
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine.
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32
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Sutter M, Siepmann J, Hennink WE, Jiskoot W. Recombinant gelatin hydrogels for the sustained release of proteins. J Control Release 2007; 119:301-12. [DOI: 10.1016/j.jconrel.2007.03.003] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Revised: 02/22/2007] [Accepted: 03/05/2007] [Indexed: 11/29/2022]
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33
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Yuan B, Xing LL, Zhang YD, Lu Y, Luo YY, Mai ZH, Li M. Penetration and Saturation of Lysozyme in Phospholipid Bilayers. J Phys Chem B 2007; 111:6151-5. [PMID: 17500554 DOI: 10.1021/jp071050u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We show that the combination of X-ray reflectivity, tryptophan fluorescence spectrum, and fluorescence quenching by bromine provides a useful tool to probe the location of lysozyme in lipid bilayers. To this end, we prepare lamellar complexes composed of phospholipids and lysozyme on solid surfaces using a solution-casting method. The proteins lie spontaneously between adjacent bilayers in the complexes. The results indicate that lysozyme may penetrate into the lipid bilayers. But the penetration depth is very shallow, and the tryptophan residues do not penetrate beyond the interface between the hydrocardon core and the headgroup region of the lipid bilayer. The penetration becomes saturated when more proteins are incorporated into the lamellar complex. The excess proteins stay in the interlamellar aqueous layers.
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Affiliation(s)
- Bing Yuan
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
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34
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Gorbenko GP, Ioffe VM, Kinnunen PKJ. Binding of lysozyme to phospholipid bilayers: evidence for protein aggregation upon membrane association. Biophys J 2007; 93:140-53. [PMID: 17434939 PMCID: PMC1914450 DOI: 10.1529/biophysj.106.102749] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Biological functions of lysozyme, including its antimicrobial, antitumor, and immune-modulatory activities have been suggested to be largely determined by the lipid binding properties of this protein. To gain further insight into these interactions on a molecular level the association of lysozyme to liposomes composed of either 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine or its mixtures with 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-rac-glycerol, 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-rac-phosphatidylserine, or bovine heart cardiolipin was studied by a combination of fluorescence techniques. The characteristics of the adsorption of lysozyme to lipid bilayers were investigated using fluorescein 5'-isothiocyanate labeled protein, responding to membrane association by a decrease in fluorescence. Upon increasing the content of anionic phospholipids in lipid vesicles, the binding isotherms changed from Langmuir-like to sigmoidal. Using adsorption models based on scaled particle and double-layer theories, this finding was rationalized in terms of self-association of the membrane-bound protein. The extent of quenching of lysozyme tryptophan fluorescence by acrylamide decreased upon membrane binding, revealing a conformational transition for the protein upon its surface association, resulting in a diminished access of the fluorophore to the aqueous phase. Steady-state fluorescence anisotropy of bilayer-incorporated probe 1,6-diphenyl-1,3,5-hexatriene was measured at varying lipid-to-protein molar ratios. Lysozyme was found to increase acyl-chain order for liposomes with the content of acidic phospholipid exceeding 10 mol %. Both electrostatic and hydrophobic protein-lipid interactions can be concluded to modulate the aggregation behavior of lysozyme when bound to lipid bilayers. Modulation of lysozyme aggregation propensity by membrane binding may have important implications for protein fibrillogenesis in vivo. Disruption of membrane integrity by the aggregated protein species is likely to be the mechanism responsible for the cytotoxicity of lysozyme.
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Affiliation(s)
- Galyna P Gorbenko
- Department of Biological and Medical Physics, V. N. Karazin Kharkiv National University, Kharkiv, Ukraine
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35
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Ioffe VM, Gorbenko GP, Kinnunen PKJ, Tatarets AL, Kolosova OS, Patsenker LD, Terpetschnig EA. Tracing Lysozyme-Lipid Interactions with Long-Wavelength Squaraine Dyes. J Fluoresc 2006; 17:65-72. [PMID: 17192821 DOI: 10.1007/s10895-006-0142-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Accepted: 10/13/2006] [Indexed: 10/23/2022]
Abstract
The applicability of the two newly commercial available squaraine labels Square-670-NHS and Seta-635-NHS to exploring protein-lipid interactions has been evaluated. The labels were conjugated to lysozyme (Lz) (squaraine-lysozyme conjugates below referred to as Square-670-Lz and Seta-635-Lz), a structurally well-characterized small globular protein displaying the ability to interact both, electrostatically and hydrophobically with lipids. The lipid component of the model systems was represented by lipid vesicles composed of zwitterionic lipids egg yolk phosphatidylcholine (PC) and 1-stearoyl-2-oleoyl-sn-glycero-3-phosphocholine (SOPC), and their mixtures with anionic lipids either beef heart cardiolipin (CL) or 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG), respectively. Fluorescence intensity of Square-670-Lz was found to decrease upon association with lipid bilayer, while the fluorescence intensity of Seta-635-Lz displayed more complex behavior depending on lipid-to-protein molar ratio. Covalent coupling of squaraine labels to lysozyme exerts different influence on the properties of dye-protein conjugate. It was suggested that Square-670-NHS covalent attachment to Lz molecule enhances protein propensity for self-association, while squaraine label Seta-635-NHS is sensitive to different modes of lysozyme-lipid interactions-within the L:P range 6-11, when hydrophobic protein-lipid interactions are predominant, an aggregation of membrane-bound protein molecules takes place, thereby decreasing the fluorescence intensity of Seta-635-Lz. At higher L:P values (from 22 to 148) when electrostatic interactions are enhanced fluorescence intensity of Seta-635-Lz increases with increasing lipid concentrations.
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Affiliation(s)
- Valeriya M Ioffe
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, 4 Svobody Sq., 32-90 Geroyev Truda St., Kharkov 61146, Ukraine.
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Ioffe VM, Gorbenko GP, Tatarets AL, Patsenker LD, Terpechnig EA. Examining Protein-Lipid Interactions in Model Systems with a New Squarylium Fluorescent Dye. J Fluoresc 2006; 16:547-54. [PMID: 16794868 DOI: 10.1007/s10895-006-0092-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2006] [Accepted: 03/22/2006] [Indexed: 11/29/2022]
Abstract
The applicability of newly synthesized squarylium dye Sq to probing the changes in physical characteristics of lipid bilayer on the formation of protein-lipid complexes has been evaluated. Lipid vesicles composed of zwitterionic phospholipid phosphatidylcholine (PC) and its mixtures with positively charged detergent cetyltrimethylammonium bromide (CTAB), anionic phospholipid cardiolipin (CL), and cholesterol (Chol) were employed as lipid component of model membrane systems while protein constituent was represented by lysozyme (Lz). Fluorescence intensity of Sq was found to decrease on Lz association with lipid bilayer. This effect was observed in all kinds of model systems suggesting that Sq is sensitive to modification of lipid bilayer physical properties on hydrophobic protein-lipid interactions. It was found that Sq spectral response to variations in Chol content depends on relative contributions of electrostatic and hydrophobic components of Lz-membrane binding.
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Affiliation(s)
- Valeriya M Ioffe
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine.
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