151
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Jayaram DT, Shankar BH, Ramaiah D. Effective Amyloid Defibrillation by Polyhydroxyl-Substituted Squaraine Dyes. Chem Asian J 2015; 10:2689-94. [PMID: 26289494 DOI: 10.1002/asia.201500780] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Indexed: 12/14/2022]
Abstract
With an objective to develop β-amyloid destabilizing agents, we have investigated the interactions of a few water-soluble near-infrared (NIR)-absorbing squaraine dyes 1-3 with lysozyme and its amyloid aggregates through photophysical and biophysical techniques. These dyes exhibited strong interactions with lysozyme and β-amyloids in addition to serum albumins as evidenced by the absorption and emission changes. The interactions were found to be spontaneous with association constant values in the range of approximately 10(4)-10(5) m(-1), as confirmed through half-reciprocal analysis and isothermal calorimetric measurements. Uniquely, such effective interactions of the dyes have led to the complete disassembly of the β-amyloid fibrillar structures to form spherical particles approximately 350 nm in size, as confirmed through photophysical, thioflavin assay, circular dichroism (CD), atomic force microscopy (AFM), TEM, and selected-area electron diffraction (SAED) techniques. These results demonstrate that the squaraine dyes 1-3 under investigation act as effective protein-labelling and destabilizing agents of the protein amyloidogenesis.
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Affiliation(s)
- Dhanya T Jayaram
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum 695019, Kerala, India
| | - Balaraman H Shankar
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum 695019, Kerala, India
| | - Danaboyina Ramaiah
- Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum 695019, Kerala, India. , , .,CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat 785006, Assam, India. , ,
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152
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Shariatizi S, Meratan AA, Ghasemi A, Nemat-Gorgani M. Inhibition of amyloid fibrillation and cytotoxicity of lysozyme fibrillation products by polyphenols. Int J Biol Macromol 2015; 80:95-106. [PMID: 26102331 DOI: 10.1016/j.ijbiomac.2015.06.030] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 12/13/2022]
Abstract
An increasing number of studies conducted under in vitro and in vivo conditions, have concluded that polyphenols, compounds frequently occurring in many herbs with antioxidant properties, prevent and reverse amyloid fibril formation. However, the mechanisms by which these natural products modulate the protein aggregation process are poorly understood. Herein, a range of techniques including thioflavin T (ThT) and ANS fluorescence assays, electron microscopy and circular dichroism have been employed to determine the efficacy of rosmarinic acid (RA) and resveratrol (Res) on the inhibition/reversion of fibrillogenesis and hindering cytotoxicity induced by protofibrils and amyloid fibrils of hen egg white lysozyme (HEWL). Results demonstrated that both polyphenols effectively inhibit fibrillogenesis and destabilize preformed fibrils of HEWL in a concentration-dependent manner. Cytotoxicity protection on PC12 cells was also observed using the MTT assay, ROS production assay, and phase-contrast microscopy. It is suggested that the mechanism underlying the inhibitory effects of RA and Res is to prevent hydrophobic interactions between HEWL amyloidogenic prefibrillar species, although additional studies is needed to elucidate the detailed mechanisms involved. A combination of antioxidative and anti-amyloidogenic properties of these molecules may provide them with the described neuroprotective capacities.
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Affiliation(s)
- Sajad Shariatizi
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
| | - Ali Akbar Meratan
- Department of Biotechnology, Ramin University of Agricultural and Natural Resources, Khouzestan, Iran.
| | - Atiyeh Ghasemi
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
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153
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Pagano RS, López Medus M, Gómez GE, Couto PM, Labanda MS, Landolfo L, D'Alessio C, Caramelo JJ. Protein fibrillation lag times during kinetic inhibition. Biophys J 2015; 107:711-720. [PMID: 25099810 DOI: 10.1016/j.bpj.2014.06.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 06/03/2014] [Accepted: 06/18/2014] [Indexed: 12/14/2022] Open
Abstract
Protein aggregation is linked to more than 30 human pathologies, including Alzheimer's and Parkinson's diseases. Since small oligomers that form at the beginning of the fibrillation process probably are the most toxic elements, therapeutic strategies involving fibril fragmentation could be detrimental. An alternative approach, named kinetic inhibition, aims to prevent fibril formation by using small ligands that stabilize the parent protein. The factors that govern fibrillation lag times during kinetic inhibition are largely unknown, notwithstanding their importance for designing effective long-term therapies. Inhibitor-bound species are not likely to be incorporated into the core of mature fibrils, although their presence could alter the kinetics of the fibrillation process. For instance, inhibitor-bound species may act as capping elements that impair the nucleation process and/or fibril growth. Here, we address this issue by studying the effect of two natural inhibitors on the fibrillation behavior of lysozyme at neutral pH. We analyzed a set of 79 fibrillation curves obtained in lysozyme alone and a set of 37 obtained in the presence of inhibitors. We calculated the concentrations of the relevant species at the beginning of the curves using the inhibitor-binding constants measured under the same experimental conditions. We found that inhibitor-bound protein species do not affect fibrillation onset times, which are mainly determined by the concentration of unbound protein species present in equilibrium. In this system, knowledge of the fibrillation kinetics and inhibitor affinities suffices to predict the effect of kinetic inhibitors on fibrillation lag times. In addition, we developed a new methodology to better estimate fibrillation lag times from experimental curves.
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Affiliation(s)
- Rodrigo S Pagano
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina
| | - Máximo López Medus
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina
| | - Gabriela E Gómez
- Department of Biological Chemistry, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Paula M Couto
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina
| | - María S Labanda
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina
| | - Lucas Landolfo
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina
| | - Cecilia D'Alessio
- Laboratory of Glycobiology, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina; Department of Physiology and Molecular Biology, University of Buenos Aires, Buenos Aires, Argentina
| | - Julio J Caramelo
- Structural Cell Biology Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Buenos Aires, Argentina; Department of Biological Chemistry, School of Sciences, University of Buenos Aires, Buenos Aires, Argentina.
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154
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Thompson AJ, Herling TW, Kubánková M, Vyšniauskas A, Knowles TPJ, Kuimova MK. Molecular Rotors Provide Insights into Microscopic Structural Changes During Protein Aggregation. J Phys Chem B 2015; 119:10170-9. [DOI: 10.1021/acs.jpcb.5b05099] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Therese W. Herling
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Markéta Kubánková
- Chemistry
Department, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Aurimas Vyšniauskas
- Chemistry
Department, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Tuomas P. J. Knowles
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Marina K. Kuimova
- Chemistry
Department, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
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155
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Mariño L, Pauwels K, Casasnovas R, Sanchis P, Vilanova B, Muñoz F, Donoso J, Adrover M. Ortho-methylated 3-hydroxypyridines hinder hen egg-white lysozyme fibrillogenesis. Sci Rep 2015; 5:12052. [PMID: 26169912 PMCID: PMC4500996 DOI: 10.1038/srep12052] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 06/16/2015] [Indexed: 12/15/2022] Open
Abstract
Protein aggregation with the concomitant formation of amyloid fibrils is related to several neurodegenerative diseases, but also to non-neuropathic amyloidogenic diseases and non-neurophatic systemic amyloidosis. Lysozyme is the protein involved in the latter, and it is widely used as a model system to study the mechanisms underlying fibril formation and its inhibition. Several phenolic compounds have been reported as inhibitors of fibril formation. However, the anti-aggregating capacity of other heteroaromatic compounds has not been studied in any depth. We have screened the capacity of eleven different hydroxypyridines to affect the acid-induced fibrillization of hen lysozyme. Although most of the tested hydroxypyridines alter the fibrillation kinetics of HEWL, only 3-hydroxy-2-methylpyridine, 3-hydroxy-6-methylpyridine and 3-hydroxy-2,6-dimethylpyridine completely abolish fibril formation. Different biophysical techniques and several theoretical approaches are combined to elucidate their mechanism of action. O-methylated 3-hydroxypyridines bind non-cooperatively to two distinct but amyloidogenic regions of monomeric lysozyme. This stabilises the protein structure, as evidenced by enhanced thermal stability, and results in the inhibition of the conformational transition that precedes fibril assembly. Our results point to o-methylated 3-hydroxypyridines as a promising molecular scaffold for the future development of novel fibrillization inhibitors.
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Affiliation(s)
- Laura Mariño
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Kris Pauwels
- Structural Biology Brussels, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium
- VIB Structural Biology Research Centre, Vlaams Instituut voor Biotechnologie, Pleinlaan 2, 1050 Brussel, Belgium
| | - Rodrigo Casasnovas
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Pilar Sanchis
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Bartolomé Vilanova
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Francisco Muñoz
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Josefa Donoso
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
| | - Miquel Adrover
- Institut Universitari d’Investigació en Ciències de la Salut (IUNICS). Departament de Química, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122 Palma de Mallorca, Spain
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156
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Inhibition of amyloid fibril formation and cytotoxicity by a chemical analog of Curcumin as a stable inhibitor. Int J Biol Macromol 2015; 78:396-404. [DOI: 10.1016/j.ijbiomac.2015.04.038] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/24/2015] [Accepted: 04/07/2015] [Indexed: 11/19/2022]
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157
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Ishtikhar M, Usmani SS, Gull N, Badr G, Mahmoud MH, Khan RH. Inhibitory effect of copper nanoparticles on rosin modified surfactant induced aggregation of lysozyme. Int J Biol Macromol 2015; 78:379-88. [DOI: 10.1016/j.ijbiomac.2015.03.069] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 03/10/2015] [Accepted: 03/12/2015] [Indexed: 12/19/2022]
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158
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Zheng Z, Jing B, Sorci M, Belfort G, Zhu Y. Accelerated insulin aggregation under alternating current electric fields: Relevance to amyloid kinetics. BIOMICROFLUIDICS 2015; 9:044123. [PMID: 26339322 PMCID: PMC4552700 DOI: 10.1063/1.4928767] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 08/07/2015] [Indexed: 06/05/2023]
Abstract
The time-dependent nucleation phase is critical to amyloid fibrillation and related to many pathologies, in which the conversion from natively folded amyloidogenic proteins to oligomers via nucleation is often hypothesized as a possible underlying mechanism. In this work, non-uniform AC-electric fields across two asymmetric electrodes were explored to control and examine the aggregation of insulin, a model amyloid protein, in aqueous buffer solution at constant temperature (20 °C) by fluorescence correlation spectroscopy and fluorescence microscopy. Insulin was rapidly concentrated in a strong AC-field by imposed AC-electroosmosis flow over an optimal frequency range of 0.5-2 kHz. In the presence of an AC-field, direct fibrillation from insulin monomers without the formation of oligomer precursors was observed. Once the insulin concentration had nearly doubled its initial concentration, insulin aggregates were observed in solution. The measured lag time for the onset of insulin aggregation, determined from the abrupt reduction in insulin concentration in solution, was significantly shortened from months or years in the absence of AC-fields to 1 min-3 h under AC-fields. The ability of external fields to alter amyloid nucleation kinetics provides insights into the onset of amyloid fibrillation.
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Affiliation(s)
- Zhongli Zheng
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, USA
| | - Benxin Jing
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, USA
| | - Mirco Sorci
- Howard P. Isermann Department of Chemical and Biological Engineering and The Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, USA
| | - Georges Belfort
- Howard P. Isermann Department of Chemical and Biological Engineering and The Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, USA
| | - Yingxi Zhu
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, USA
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159
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Lysozyme stability and amyloid fibrillization dependence on Hofmeister anions in acidic pH. J Biol Inorg Chem 2015; 20:921-33. [DOI: 10.1007/s00775-015-1276-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/31/2015] [Indexed: 10/23/2022]
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160
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Evidence of two oxidation states of copper during aggregation of hen egg white lysozyme (HEWL). Int J Biol Macromol 2015; 76:1-9. [DOI: 10.1016/j.ijbiomac.2015.02.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 02/13/2015] [Accepted: 02/13/2015] [Indexed: 11/18/2022]
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161
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Chang CK, Chen WA, Sie CY, Lin SC, Lin LTW, Lin TH, Hsu CC, Wang SSS. Investigating the effects of plasma pretreatment on the formation of ordered aggregates of lysozyme. Colloids Surf B Biointerfaces 2015; 126:154-61. [DOI: 10.1016/j.colsurfb.2014.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 12/05/2014] [Accepted: 12/09/2014] [Indexed: 11/30/2022]
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162
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Ow SY, Bekard I, Blencowe A, Qiao GG, Dunstan DE. A generic class of amyloid fibril inhibitors. J Mater Chem B 2015; 3:1350-1359. [DOI: 10.1039/c4tb01762e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Amyloid fibrils are large ordered fibrillar aggregates formed from mis-folded proteins. Fibril formation is inhibited using a generic macromolecular structure.
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Affiliation(s)
- Sian-Yang Ow
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Australia
| | - Innocent Bekard
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Australia
| | - Anton Blencowe
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Australia
- Mawson Institute
- Division of ITEE
| | - Greg G. Qiao
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Australia
| | - Dave E. Dunstan
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Australia
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163
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Ormus S, Oulahal N, Noël C, Degraeve P, Gharsallaoui A. Effect of low methoxyl (LM) pectin complexation on the thermal and proteolytic inactivation of lysozyme: A kinetic study. Food Hydrocoll 2015. [DOI: 10.1016/j.foodhyd.2014.08.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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164
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Martyushenko N, Bell NAW, Lamboll RD, Keyser UF. Nanopore analysis of amyloid fibrils formed by lysozyme aggregation. Analyst 2015; 140:4882-6. [DOI: 10.1039/c5an00530b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lysozyme fibrils translocate uncoated glass nanopores at low pH without significant non-specific sticking enabling unprecedented statistics on thousands of fibril translocations and comparison with a simple bulk conductivity model.
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165
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Ramshini H, Ebrahim-Habibi A, Aryanejad S, Rad A. Effect of Cinnamomum Verum Extract on the Amyloid Formation of Hen Egg-white Lysozyme and Study of its Possible Role in Alzheimer's Disease. Basic Clin Neurosci 2015; 6:29-37. [PMID: 27504154 PMCID: PMC4741270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
INTRODUCTION Diagnosing and treating diseases associated with amyloid fibers remain a great challenge despite of intensive research carried out. One important approach in the development of therapeutics is the use of herbal extracts which are rich in aromatic small molecules. Cinnamomum verum extract (CE) contains proanthocyanidin and cinnamaldehyde, which have been suggested to be capable of directly inhibiting amyloid fibril formation in vitro. This study is aimed at characterizing the inhibitory activity of CE against the fibrillation of hen egg white lysozyme (HEWL). METHODS Acidic pH and high temperatures were used to drive the protein towards amyloid formation. Lysozyme was dissolved at 2 mg/mL in 50mM glycine buffer (pH 2.5), and then incubated at 57 °C for the specified durations while stirred gently by Teflon magnetic bars. Various techniques including thioflavin T, fluorescence, Congo red absorbance assay and AFM micrography were used to characterize the HEWL fibrillation processes. RESULTS In the absence of CE typical amyloid fibrils (like amyloids formed in Alzheimer disease) became evident after 48 h of incubation. Upon incubation with various extract concentrations in the range of 0.1-1 mg/ml, formation of fibrillar assemblies were significantly inhibited (P<0.05). AFM analysis and MTT assay also confirmed the role of the extract in amyloid inhibition. Our studies showed that the presence of CE did not have any effect on protein stabilization and thus directly interact with amyloid structure and inhibit formation of these structures. Furthermore, a docking experiment showed that a pi-pi interaction may occur between the aromatic component of cinnamaldehyde and W62. Interestingly, W62 is one of the principal aromatic residues that interact with glycine amide, which is an aggregation suppressor of HEWL. DISCUSSION These observations suggest that aromatic small molecules of CE may directly insert into amyloidogenic core of early aggregates and inhibit amyloid fibril formation by disrupting the pi-pi interactions.
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Affiliation(s)
- Hassan Ramshini
- Department of Biology, Payam Noor University, Tehran, Iran,Corresponding Author: Hassan Ramshini, PhD, Address: Department of Biology, Payam Noor University, Tehran, Iran. Tel.: +98 (514) 4644012 Fax: +98 (571) 2641788 P. O. Box: 19395-3697, E-mail:
| | - Azadeh Ebrahim-Habibi
- Endocrinology and Metabolism Research Center, Endocrinology & Metabolism Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Sima Aryanejad
- Department of Biology, Payam Noor University, Tehran, Iran
| | - Abolfazl Rad
- Department of Biochemistry & Nutrition, Cellular Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
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166
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Miti T, Mulaj M, Schmit JD, Muschol M. Stable, metastable, and kinetically trapped amyloid aggregate phases. Biomacromolecules 2014; 16:326-35. [PMID: 25469942 PMCID: PMC4294590 DOI: 10.1021/bm501521r] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Self-assembly of proteins into amyloid fibrils plays a key role in a multitude of human disorders that range from Alzheimer's disease to type II diabetes. Compact oligomeric species, observed early during amyloid formation, are reported as the molecular entities responsible for the toxic effects of amyloid self-assembly. However, the relation between early-stage oligomeric aggregates and late-stage rigid fibrils, which are the hallmark structure of amyloid plaques, has remained unclear. We show that these different structures occupy well-defined regions in a peculiar phase diagram. Lysozyme amyloid oligomers and their curvilinear fibrils only form after they cross a salt and protein concentration-dependent threshold. We also determine a boundary for the onset of amyloid oligomer precipitation. The oligomeric aggregates are structurally distinct from rigid fibrils and are metastable against nucleation and growth of rigid fibrils. These experimentally determined boundaries match well with colloidal model predictions that account for salt-modulated charge repulsion. The model also incorporates the metastable and kinetic character of oligomer phases. Similarities and differences of amyloid oligomer assembly to metastable liquid-liquid phase separation of proteins and to surfactant aggregation are discussed.
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Affiliation(s)
- Tatiana Miti
- Department of Physics, University of South Florida , Tampa, Florida 33620, United States
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167
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Kumar EK, Prabhu NP. Differential effects of ionic and non-ionic surfactants on lysozyme fibrillation. Phys Chem Chem Phys 2014; 16:24076-88. [PMID: 25288276 DOI: 10.1039/c4cp02423k] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fibril formation is a common property of many proteins, though not all are associated with diseases. Protein surface charges and the added co-solvents play vital roles in determining fibrillation pathways and kinetics. In order to understand these phenomena, the effects of anionic, cationic and non-ionic surfactants on lysozyme fibrillation were studied. Lysozyme forms fibrils in 2 M and 4 M urea solutions following nucleation-dependent and nucleation-independent pathways, respectively, at neutral pH. Under these conditions, the effects of sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and triton X-100 (Tx) were investigated on the lysozyme structure and fibrillation. The results indicate that there are differential effects of ionic and non-ionic surfactants on fibrillation. In the presence of SDS and CTAB, above their critical micelle concentrations (CMC), lysozyme could not form fibrils. However, non-ionic Tx does not inhibit fibril formation at all concentrations. Note that the time for complete fibril formation is increased by Tx. All of the surfactants are found to increase the initial nucleation phase; however, the extent of increase is less at near the CMC of the ionic surfactants and at above the CMC of Tx. The rates of fibril elongation show varying effects in the presence of different surfactants. The results suggest that the nucleation phase of lysozyme fibrillation is primarily controlled by charge interactions and micellation of the surfactants, but multiple factors might influence the fibril elongation. Furthermore, the surfactants do not alter the fibrillation pathway from nucleation-dependent to nucleation-independent or vice versa in the studied conditions.
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Affiliation(s)
- E Kiran Kumar
- Department of Biotechnology and Bioinformatics, School of Life sciences, University of Hyderabad, Hyderabad - 500046, India.
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168
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Crowded milieu prevents fibrillation of hen egg white lysozyme with retention of enzymatic activity. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 138:8-16. [DOI: 10.1016/j.jphotobiol.2014.04.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 04/22/2014] [Accepted: 04/24/2014] [Indexed: 11/18/2022]
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169
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Sharma R, Furusawa K, Fukui A, Sasaki N. Effects of a flow field on amyloid fibrillogenesis in a β-lactoglobulin solution. Int J Biol Macromol 2014; 70:490-7. [DOI: 10.1016/j.ijbiomac.2014.06.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/21/2014] [Accepted: 06/22/2014] [Indexed: 10/25/2022]
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170
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Wawer J, Krakowiak J, Szociński M, Lustig Z, Olszewski M, Szostak K. Inhibition of amyloid fibril formation of hen egg white lysozyme by trimethylamine N-oxide at low pH. Int J Biol Macromol 2014; 70:214-21. [DOI: 10.1016/j.ijbiomac.2014.06.057] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/20/2014] [Accepted: 06/30/2014] [Indexed: 10/25/2022]
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171
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Zou Y, Hao W, Li H, Gao Y, Sun Y, Ma G. New insight into amyloid fibril formation of hen egg white lysozyme using a two-step temperature-dependent FTIR approach. J Phys Chem B 2014; 118:9834-43. [PMID: 25080318 DOI: 10.1021/jp504201k] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Hen egg white lysozyme (HEWL) is widely used in the mechanistic study of amyloid fibril formation. Yet, the fibrillation mechanism of HEWL is not well understood. In particular, in situ structural evidence for the on-pathway oligomeric intermediate has never been captured. Such evidence is crucial for confirming nucleated conformational conversion mechanism. Herein, we attempt to use a two-step temperature-dependent Fourier transform infrared (FTIR) approach to capture the in situ evidence for the on-pathway oligomeric intermediate and the oligomer-to-fibril transition during HEWL fibrillation. Key features of this approach include using lower temperature to generate the on-pathway oligomeric intermediate, using elevated temperature to eliminate the interference from the off-pathway oligomer and to facilitate the oligomer-to-fibril transition, and using FTIR difference spectroscopy and atomic force microscopy to tackle structure and morphology. Using such an approach, we reveal that the on-pathway oligomeric intermediate is in parallel β-sheet configuration featuring a frequency at 1622 cm(-1) and the oligomer-to-fibril transition is accompanied by a spectral transition from 1622 to 1618 cm(-1). We also discover the beneficial role of the off-pathway oligomer in the capturing of the transient on-pathway oligomeric intermediate by serving as a monomer-releasing reservoir. This approach should also be useful in other amyloidogenic systems.
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Affiliation(s)
- Ye Zou
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Chemistry and Environmental Science, Hebei University , Baoding 071002, China
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172
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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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173
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Mulaj M, Foley J, Muschol M. Amyloid oligomers and protofibrils, but not filaments, self-replicate from native lysozyme. J Am Chem Soc 2014; 136:8947-56. [PMID: 24884889 PMCID: PMC4227717 DOI: 10.1021/ja502529m] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Self-assembly
of amyloid fibrils is the molecular mechanism best
known for its connection with debilitating human disorders such as
Alzheimer’s disease but is also associated with various functional
cellular responses. There is increasing evidence that amyloid formation
proceeds along two distinct assembly pathways involving either globular
oligomers and protofibrils or rigid monomeric filaments. Oligomers,
in particular, have been implicated as the dominant molecular species
responsible for pathogenesis. Yet the molecular mechanisms regulating
their self-assembly have remained elusive. Here we show that oligomers/protofibrils
and monomeric filaments, formed along distinct assembly pathways,
display critical differences in their ability to template amyloid
growth at physiological vs denaturing temperatures. At physiological
temperatures, amyloid filaments remained stable but could not seed
growth of native monomers. In contrast, oligomers and protofibrils
not only remained intact but were capable of self-replication using
native monomers as the substrate. Kinetic data further suggested that
this prion-like growth mode of oligomers/protofibrils involved two
distinct activities operating orthogonal from each other: autocatalytic
self-replication of oligomers from native monomers and nucleated polymerization
of oligomers into protofibrils. The environmental changes to stability
and templating competence of these different amyloid species in different
environments are likely to be important for understanding the molecular
mechanisms underlying both pathogenic and functional amyloid self-assembly.
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Affiliation(s)
- Mentor Mulaj
- Department of Physics, University of South Florida , Tampa, Florida 33620, United States
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174
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Dubey K, Kar K. Type I collagen prevents amyloid aggregation of hen egg white lysozyme. Biochem Biophys Res Commun 2014; 448:480-4. [DOI: 10.1016/j.bbrc.2014.04.135] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 04/25/2014] [Indexed: 10/25/2022]
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175
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Ghosh S, Pandey NK, Banerjee P, Chaudhury K, Nagy NV, Dasgupta S. Copper(II) directs formation of toxic amorphous aggregates resulting in inhibition of hen egg white lysozyme fibrillation under alkaline salt-mediated conditions. J Biomol Struct Dyn 2014; 33:991-1007. [PMID: 24806136 DOI: 10.1080/07391102.2014.921864] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Hen egg white lysozyme (HEWL) adopts a molten globule-like state at high pH (~12.75) and is found to form amyloid fibrils at alkaline pH. Here, we report that Cu(II) inhibits self-association of HEWL at pH 12.75 both at 37 and 65 °C. A significant reduction in Thioflavin T fluorescence intensity, attenuation in β-sheet content and reduction in hydrophobic exposure were observed with increasing Cu(II) stoichiometry. Electron paramagnetic resonance spectroscopy suggests a 4N type of coordination pattern around Cu(II) during fibrillation. Cu(II) is also capable of altering the cytotoxicity of the proteinaceous aggregates. Fibrillar species of diverse morphology were found in the absence of Cu(II) with the generation of amorphous aggregates in the presence of Cu(II), which are more toxic compared to the fibrils alone.
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Affiliation(s)
- Sudeshna Ghosh
- a Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , India
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176
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Amyloid Fibril Formation of Hen Lysozyme Depends on the Instability of the C-Helix (88-99). Biosci Biotechnol Biochem 2014; 72:1523-30. [DOI: 10.1271/bbb.80032] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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177
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Probing the interplay between amyloidogenic proteins and membranes using lipid monolayers and bilayers. Adv Colloid Interface Sci 2014; 207:81-92. [PMID: 24200086 DOI: 10.1016/j.cis.2013.10.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 10/11/2013] [Accepted: 10/13/2013] [Indexed: 11/21/2022]
Abstract
Many degenerative diseases such as Alzheimer's and Parkinson's involve proteins that have a tendency to misfold and aggregate eventually forming amyloid fibers. This review describes the use of monolayers, bilayers, supported membranes, and vesicles as model systems that have helped elucidate the mechanisms and consequences of the interactions between amyloidogenic proteins and membranes. These are twofold: membranes favor the formation of amyloid structures and these induce damage in those membranes. We describe studies that show how interfaces, especially charged ones, favor amyloidogenic protein aggregation by several means. First, surfaces increase the effective protein concentration reducing a three-dimensional system to a two-dimensional one. Second, charged surfaces allow electrostatic interactions with the protein. Anionic lipids as well as rafts, rich in cholesterol and gangliosides, prove to play an especially important role. Finally, these amphipathic systems also offer a hydrophobic environment favoring conformational changes, oligomerization, and eventual formation of mature fibers. In addition, we examine several models for membrane permeabilization: protein pores, leakage induced by extraction of lipids, chaotic pores, and membrane tension, presenting illustrative examples of experimental evidence in support of these models. The picture that emerges from recent work is one where more than one mechanism is in play. Which mechanism prevails depends on the protein, its aggregation state, and the lipid environment in which the interactions occur.
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178
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Khan JM, Chaturvedi SK, Rahman SK, Ishtikhar M, Qadeer A, Ahmad E, Khan RH. Protonation favors aggregation of lysozyme with SDS. SOFT MATTER 2014; 10:2591-2599. [PMID: 24647567 DOI: 10.1039/c3sm52435c] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Different proteins have different amino acid sequences as well as conformations, and therefore different propensities to aggregate. Electrostatic interactions have an important role in the aggregation of proteins as revealed by our previous report (J. M. Khan et al., PLoS One, 2012, 7, e29694). In this study, we designed and executed experiments to gain knowledge of the role of charge variations on proteins during the events of protein aggregation with lysozyme as a model protein. To impart positive and negative charges to proteins, we incubated lysozyme at different pH values of below and above the pI (∼11). Negatively charged SDS was used to 'antagonize' positive charges on lysozyme. We examined the effects of pH variations on SDS-induced amyloid fibril formation by lysozyme using methods such as far-UV circular dichroism, Rayleigh scattering, turbidity measurements, dye binding assays and dynamic light scattering. We found that sub-micellar concentrations of SDS (0.1 to 0.6 mM) induced amyloid fibril formation by lysozyme in the pH range of 10.0-1.0 and maximum aggregation was observed at pH 1.0. The morphology of aggregates was fibrillar in structure, as visualized by transmission electron microscopy. Isothermal titration calorimetry studies demonstrated that fibril formation is exothermic. To the best of our current understanding of the mechanism of aggregation, this study demonstrates the crucial role of electrostatic interactions during amyloid fibril formation. The model proposed here will help in designing molecules that can prevent or reverse the amyloid fibril formation or the aggregation.
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Affiliation(s)
- Javed M Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India.
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179
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Sagis LM. Dynamic behavior of interfaces: modeling with nonequilibrium thermodynamics. Adv Colloid Interface Sci 2014; 206:328-43. [PMID: 23672962 DOI: 10.1016/j.cis.2013.03.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 03/26/2013] [Accepted: 03/27/2013] [Indexed: 12/17/2022]
Abstract
In multiphase systems the transfer of mass, heat, and momentum, both along and across phase interfaces, has an important impact on the overall dynamics of the system. Familiar examples are the effects of surface diffusion on foam drainage (Marangoni effect), or the effect of surface elasticities on the deformation of vesicles or red blood cells in an arterial flow. In this paper we will review recent work on modeling transfer processes associated with interfaces in the context of nonequilibrium thermodynamics (NET). The focus will be on NET frameworks employing the Gibbs dividing surface model, in which the interface is modeled as a two-dimensional plane. This plane has excess variables associated with it, such as a surface mass density, a surface momentum density, a surface energy density, and a surface entropy density. We will review a number of NET frameworks which can be used to derive balance equations and constitutive models for the time rate of change of these excess variables, as a result of in-plane (tangential) transfer processes, and exchange with the adjoining bulk phases. These balance equations must be solved together with mass, momentum, and energy balances for the bulk phases, and a set of boundary conditions coupling the set of bulk and interface equations. This entire set of equations constitutes a comprehensive continuum model for a multiphase system, and allows us to examine the role of the interfacial dynamics on the overall dynamics of the system. With respect to the constitutive equations we will focus primarily on equations for the surface extra stress tensor.
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180
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Lara C, Reynolds NP, Berryman JT, Xu A, Zhang A, Mezzenga R. ILQINS Hexapeptide, Identified in Lysozyme Left-Handed Helical Ribbons and Nanotubes, Forms Right-Handed Helical Ribbons and Crystals. J Am Chem Soc 2014; 136:4732-9. [DOI: 10.1021/ja500445z] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Cecile Lara
- Food & Soft Materials, Department of Health Science & Technology, ETH Zurich, Schmelzbergstrasse 9, LFO, E23, 8092 Zürich, Switzerland
| | - Nicholas P. Reynolds
- Materials
Science and Engineering, CSIRO, Private Bag 10, Bayview Avenue, Clayton, Vic 3169, Australia
| | - Joshua T. Berryman
- Faculty
of Science Technology and Communication, University of Luxembourg, 162a Avenue de la Faïencerie, L-1511 Luxembourg
| | - Anqiu Xu
- Department
of Polymer Materials, Shanghai University, Nanchen Street 333, Shanghai 200444, China
| | - Afang Zhang
- Department
of Polymer Materials, Shanghai University, Nanchen Street 333, Shanghai 200444, China
| | - Raffaele Mezzenga
- Food & Soft Materials, Department of Health Science & Technology, ETH Zurich, Schmelzbergstrasse 9, LFO, E23, 8092 Zürich, Switzerland
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181
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Borana MS, Mishra P, Pissurlenkar RR, Hosur RV, Ahmad B. Curcumin and kaempferol prevent lysozyme fibril formation by modulating aggregation kinetic parameters. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:670-80. [DOI: 10.1016/j.bbapap.2014.01.009] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Revised: 01/01/2014] [Accepted: 01/14/2014] [Indexed: 10/25/2022]
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182
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Zaman M, Ahmad E, Qadeer A, Rabbani G, Khan RH. Nanoparticles in relation to peptide and protein aggregation. Int J Nanomedicine 2014; 9:899-912. [PMID: 24611007 PMCID: PMC3928455 DOI: 10.2147/ijn.s54171] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Over the past two decades, there has been considerable research interest in the use of nanoparticles in the study of protein and peptide aggregation, and of amyloid-related diseases. The influence of nanoparticles on amyloid formation yields great interest due to its small size and high surface area-to-volume ratio. Targeting nucleation kinetics by nanoparticles is one of the most searched for ways to control or induce this phenomenon. The observed effect of nanoparticles on the nucleation phase is determined by particle composition, as well as the amount and nature of the particle's surface. Various thermodynamic parameters influence the interaction of proteins and nanoparticles in the solution, and regulate the protein assembly into fibrils, as well as the disaggregation of preformed fibrils. Metals, organic particles, inorganic particles, amino acids, peptides, proteins, and so on are more suitable candidates for nanoparticle formulation. In the present review, we attempt to explore the effects of nanoparticles on protein and peptide fibrillation processes from both perspectives (ie, as inducers and inhibitors on nucleation kinetics and in the disaggregation of preformed fibrils). Their formulation and characterization by different techniques have been also addressed, along with their toxicological effects, both in vivo and in vitro.
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Affiliation(s)
- Masihuz Zaman
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Ejaz Ahmad
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Atiyatul Qadeer
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Gulam Rabbani
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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183
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Ravi VK, Swain T, Chandra N, Swaminathan R. On the characterization of intermediates in the isodesmic aggregation pathway of hen lysozyme at alkaline pH. PLoS One 2014; 9:e87256. [PMID: 24489883 PMCID: PMC3904990 DOI: 10.1371/journal.pone.0087256] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Accepted: 12/25/2013] [Indexed: 12/24/2022] Open
Abstract
Protein aggregation leading to formation of amyloid fibrils is a symptom of several diseases like Alzheimer’s, type 2 diabetes and so on. Elucidating the poorly understood mechanism of such phenomena entails the difficult task of characterizing the species involved at each of the multiple steps in the aggregation pathway. It was previously shown by us that spontaneous aggregation of hen-eggwhite lysozyme (HEWL) at room temperature in pH 12.2 is a good model to study aggregation. Here in this paper we investigate the growth kinetics, structure, function and dynamics of multiple intermediate species populating the aggregation pathway of HEWL at pH 12.2. The different intermediates were isolated by varying the HEWL monomer concentration in the 300 nM—0.12 mM range. The intermediates were characterized using techniques like steady-state and nanosecond time-resolved fluorescence, atomic force microscopy and dynamic light scattering. Growth kinetics of non-fibrillar HEWL aggregates were fitted to the von Bertalanffy equation to yield a HEWL concentration independent rate constant (k = (6.6±0.6)×10−5 s−1). Our results reveal stepwise changes in size, molecular packing and enzymatic activity among growing HEWL aggregates consistent with an isodesmic aggregation model. Formation of disulphide bonds that crosslink the monomers in the aggregate appear as a unique feature of this aggregation. AFM images of multiple amyloid fibrils emanating radially from amorphous aggregates directly confirmed that on-pathway fibril formation was feasible under isodesmic polymerization. The isolated HEWL aggregates are revealed as polycationic protein nanoparticles that are robust at neutral pH with ability to take up non-polar molecules like ANS.
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Affiliation(s)
- Vijay Kumar Ravi
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Tulsi Swain
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Nividh Chandra
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Rajaram Swaminathan
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
- * E-mail:
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184
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Fluorescence Investigation of Interactions Between Novel Benzanthrone Dyes and Lysozyme Amyloid Fibrils. J Fluoresc 2013; 24:493-504. [DOI: 10.1007/s10895-013-1318-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 11/07/2013] [Indexed: 10/25/2022]
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185
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Relini A, Marano N, Gliozzi A. Misfolding of amyloidogenic proteins and their interactions with membranes. Biomolecules 2013; 4:20-55. [PMID: 24970204 PMCID: PMC4030986 DOI: 10.3390/biom4010020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 12/13/2013] [Accepted: 12/17/2013] [Indexed: 01/07/2023] Open
Abstract
In this paper, we discuss amyloidogenic proteins, their misfolding, resulting structures, and interactions with membranes, which lead to membrane damage and subsequent cell death. Many of these proteins are implicated in serious illnesses such as Alzheimer’s disease and Parkinson’s disease. Misfolding of amyloidogenic proteins leads to the formation of polymorphic oligomers and fibrils. Oligomeric aggregates are widely thought to be the toxic species, however, fibrils also play a role in membrane damage. We focus on the structure of these aggregates and their interactions with model membranes. Study of interactions of amlyoidogenic proteins with model and natural membranes has shown the importance of the lipid bilayer in protein misfolding and aggregation and has led to the development of several models for membrane permeabilization by the resulting amyloid aggregates. We discuss several of these models: formation of structured pores by misfolded amyloidogenic proteins, extraction of lipids, interactions with receptors in biological membranes, and membrane destabilization by amyloid aggregates perhaps analogous to that caused by antimicrobial peptides.
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Affiliation(s)
- Annalisa Relini
- Department of Physics, University of Genoa, Genoa 16146, Italy.
| | - Nadia Marano
- Department of Physics, University of Genoa, Genoa 16146, Italy.
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186
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Usov I, Adamcik J, Mezzenga R. Polymorphism complexity and handedness inversion in serum albumin amyloid fibrils. ACS NANO 2013; 7:10465-10474. [PMID: 24171389 DOI: 10.1021/nn404886k] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Protein-based amyloid fibrils can show a great variety of polymorphic structures within the same protein precursor, although the origins of these structural homologues remain poorly understood. In this work we investigate the fibrillation of bovine serum albumin--a model globular protein--and we follow the polymorphic evolution by a statistical analysis of high-resolution atomic force microscopy images, complemented, at larger length scales, by concepts based on polymer physics formalism. We identify six distinct classes of coexisting amyloid fibrils, including flexible left-handed twisted ribbons, rigid right-handed helical ribbons and nanotubes. We show that the rigid fibrils originate from flexible fibrils through two diverse polymorphic transitions, first, via a single-fibril transformation when the flexible left-handed twisted ribbons turn into the helical left-handed ribbons, to finally evolve into nanotube-like structures, and second, via a double-fibril transformation when two flexible left-handed twisted ribbons wind together resulting in a right-handed twisted ribbon, followed by a rigid right-handed helical ribbon polymorphic conformation. Hence, the change in handedness occurs with an increase in the level of the fibril's structural organization.
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Affiliation(s)
- Ivan Usov
- Food & Soft Materials Science, Department of Health Scence & Technology, ETH Zurich , Schmelzbergstrasse 9, LFO E23, 8092 Zurich, Switzerland
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187
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Wu JW, Liu KN, How SC, Chen WA, Lai CM, Liu HS, Hu CJ, Wang SSS. Carnosine's effect on amyloid fibril formation and induced cytotoxicity of lysozyme. PLoS One 2013; 8:e81982. [PMID: 24349167 PMCID: PMC3859581 DOI: 10.1371/journal.pone.0081982] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 10/20/2013] [Indexed: 11/23/2022] Open
Abstract
Carnosine, a common dipeptide in mammals, has previously been shown to dissemble alpha-crystallin amyloid fibrils. To date, the dipeptide's anti-fibrillogensis effect has not been thoroughly characterized in other proteins. For a more complete understanding of carnosine's mechanism of action in amyloid fibril inhibition, we have investigated the effect of the dipeptide on lysozyme fibril formation and induced cytotoxicity in human neuroblastoma SH-SY5Y cells. Our study demonstrates a positive correlation between the concentration and inhibitory effect of carnosine against lysozyme fibril formation. Molecular docking results show carnosine's mechanism of fibrillogenesis inhibition may be initiated by binding with the aggregation-prone region of the protein. The dipeptide attenuates the amyloid fibril-induced cytotoxicity of human neuronal cells by reducing both apoptotic and necrotic cell deaths. Our study provides solid support for carnosine's amyloid fibril inhibitory property and its effect against fibril-induced cytotoxicity in SH-SY5Y cells. The additional insights gained herein may pave way to the discovery of other small molecules that may exert similar effects against amyloid fibril formation and its associated neurodegenerative diseases.
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Affiliation(s)
- Josephine W. Wu
- Department of Optometry, Central Taiwan University of Science and Technology, Taichung, Taiwan,
- * E-mail: (JWW); (SSSW)
| | - Kuan-Nan Liu
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Su-Chun How
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Wei-An Chen
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Chia-Min Lai
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Hwai-Shen Liu
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Chaur-Jong Hu
- Department of Neurology, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
| | - Steven S. -S. Wang
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
- * E-mail: (JWW); (SSSW)
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188
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Saricay Y, Wierenga P, de Vries R. Nanostructure development during peroxidase catalysed cross-linking of α-lactalbumin. Food Hydrocoll 2013. [DOI: 10.1016/j.foodhyd.2013.04.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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189
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Munialo CD, de Jongh HHJ, Broersen K, van der Linden E, Martin AH. Modulation of the gelation efficiency of fibrillar and spherical aggregates by means of thiolation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:11628-11635. [PMID: 24206422 DOI: 10.1021/jf403723m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Fibrillar and spherical aggregates were prepared from whey protein isolate (WPI). These aggregates were thiolated to a substantial degree to observe any impact on functionality. Sulfur-containing groups were introduced on these aggregates which could be converted to thiol groups by deblocking. Changes on a molecular and microstructural level were studied using tryptophan fluorescence, transmission electron microscopy, and particle size analysis. The average size (nm) of spherical aggregates increased from 38 to 68 nm (blocked variant) and 106 nm (deblocked variant) after thiolation, whereas the structure of fibrillar aggregates was not affected. Subsequently, gels containing these different aggregates were prepared. Rheological measurements showed that thiolation decreased the gelation concentration and increased gel strength for both WPI fibrillar and spherical aggregates. This effect was more pronounced upon thiolation of preformed fibrillar aggregates. The findings suggest that thiolation at a protein aggregate level is a promising strategy to increase gelation efficiency.
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Affiliation(s)
- Claire D Munialo
- Top Institute Food and Nutrition , P.O. Box 557, 6700 AN, Wageningen, The Netherlands
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190
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Ow SY, Dunstan DE. The effect of concentration, temperature and stirring on hen egg white lysozyme amyloid formation. SOFT MATTER 2013; 9:9692-701. [PMID: 26029778 DOI: 10.1039/c3sm51671g] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Lysozyme is associated with hereditary systemic amyloidosis in humans. Hen egg white lysozyme (HEWL) has been extensively studied as an amyloid forming protein. In this study, we investigated HEWL amyloid formation over a range of temperatures at two stirring speeds and at low concentrations to avoid gel formation. The amyloid fibril formation was found to follow first order kinetics with the rate determining step being the unfolding of the lysozyme. Both the rate of formation and final amount of amyloid formed show maxima with temperature at approximately at 65 °C. CD measurements show that the lysozyme is unfolded by 55 °C. The decrease in amyloid formation at temperatures above 65 °C is attributed to competing amorphous aggregation. The majority of the non-fibrillar aggregates are small and uniform in size with a few larger amorphous aggregates observed in the AFM images.
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Affiliation(s)
- Sian-Yang Ow
- Department of chemical and biomolecular engineering, The University of Melbourne, Vic. 3010, Australia
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191
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Bhattacharya S, Ghosh S, Dasgupta S, Roy A. Structural differences between native Hen egg white lysozyme and its fibrils under different environmental conditions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:368-376. [PMID: 23786978 DOI: 10.1016/j.saa.2013.05.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 05/14/2013] [Accepted: 05/17/2013] [Indexed: 06/02/2023]
Abstract
The difference in molecular structure of native HEWL and its fibrils, grown at a pH value near physiological pH 7.4 and at a pH value just above the pI, 10.7 in presence and absence of Cu(II) ions, is discussed. We focus on differences between the molecular structure of the native protein and fibrils using principal component analysis of their Raman spectra. The overlap areas of the scores of each species are used to quantify the difference in the structure of the native HEWL and fibrils in different environments. The overall molecular structures are significantly different for fibrils grown at two pH values. However, in presence of Cu(II) ions, the fibrils have similarities in their molecular structures at these pH environments. Spectral variation within each species, as obtained from the standard deviations of the scores in PCA plots, reveals the variability in the structure within a particular species.
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192
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Ghosh S, Pandey NK, Sen S, Tripathy DR, Dasgupta S. Binding of hen egg white lysozyme fibrils with nucleic acids. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2013; 127:52-60. [DOI: 10.1016/j.jphotobiol.2013.07.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 07/09/2013] [Accepted: 07/11/2013] [Indexed: 10/26/2022]
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193
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Foley J, Hill SE, Miti T, Mulaj M, Ciesla M, Robeel R, Persichilli C, Raynes R, Westerheide S, Muschol M. Structural fingerprints and their evolution during oligomeric vs. oligomer-free amyloid fibril growth. J Chem Phys 2013; 139:121901. [PMID: 24089713 PMCID: PMC3716784 DOI: 10.1063/1.4811343] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 05/03/2013] [Indexed: 11/14/2022] Open
Abstract
Deposits of fibrils formed by disease-specific proteins are the molecular hallmark of such diverse human disorders as Alzheimer's disease, type II diabetes, or rheumatoid arthritis. Amyloid fibril formation by structurally and functionally unrelated proteins exhibits many generic characteristics, most prominently the cross β-sheet structure of their mature fibrils. At the same time, amyloid formation tends to proceed along one of two separate assembly pathways yielding either stiff monomeric filaments or globular oligomers and curvilinear protofibrils. Given the focus on oligomers as major toxic species, the very existence of an oligomer-free assembly pathway is significant. Little is known, though, about the structure of the various intermediates emerging along different pathways and whether the pathways converge towards a common or distinct fibril structures. Using infrared spectroscopy we probed the structural evolution of intermediates and late-stage fibrils formed during in vitro lysozyme amyloid assembly along an oligomeric and oligomer-free pathway. Infrared spectroscopy confirmed that both pathways produced amyloid-specific β-sheet peaks, but at pathway-specific wavenumbers. We further found that the amyloid-specific dye thioflavin T responded to all intermediates along either pathway. The relative amplitudes of thioflavin T fluorescence responses displayed pathway-specific differences and could be utilized for monitoring the structural evolution of intermediates. Pathway-specific structural features obtained from infrared spectroscopy and Thioflavin T responses were identical for fibrils grown at highly acidic or at physiological pH values and showed no discernible effects of protein hydrolysis. Our results suggest that late-stage fibrils formed along either pathway are amyloidogenic in nature, but have distinguishable structural fingerprints. These pathway-specific fingerprints emerge during the earliest aggregation events and persist throughout the entire cascade of aggregation intermediates formed along each pathway.
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Affiliation(s)
- Joseph Foley
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
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194
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Ghosh S, Pandey NK, Singha Roy A, Tripathy DR, Dinda AK, Dasgupta S. Prolonged glycation of hen egg white lysozyme generates non amyloidal structures. PLoS One 2013; 8:e74336. [PMID: 24066139 PMCID: PMC3774808 DOI: 10.1371/journal.pone.0074336] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 08/02/2013] [Indexed: 11/18/2022] Open
Abstract
Glycation causes severe damage to protein structure that could lead to amyloid formation in special cases. Here in this report, we have shown for the first time that hen egg white lysozyme (HEWL) does not undergo amyloid formation even after prolonged glycation in the presence of D-glucose, D-fructose and D-ribose. Cross-linked oligomers were formed in all the cases and ribose was found to be the most potent among the three sugars. Ribose mediated oligomers, however, exhibit Thioflavin T binding properties although microscopic images clearly show amorphous and globular morphology of the aggregates. Our study demonstrates that the structural damage of hen egg white lysozyme due to glycation generates unstructured aggregates.
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Affiliation(s)
- Sudeshna Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Nitin Kumar Pandey
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Atanu Singha Roy
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Debi Ranjan Tripathy
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Amit Kumar Dinda
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
- * E-mail:
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195
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Lara C, Handschin S, Mezzenga R. Towards lysozyme nanotube and 3D hybrid self-assembly. NANOSCALE 2013; 5:7197-7201. [PMID: 23824259 DOI: 10.1039/c3nr02194g] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report lysozyme self-assembly into nanotubes, under the effect of hydrolysis at pH 2 and 90 °C. We resolve the final steps of the fibrillation pathway, entailing the closure of multi-stranded helical ribbons into nanotubes, and we provide evidence of β-sheet arrangement within the nanotubes, demonstrating amyloid-like aggregation. Addition of chloroauric acid to the self-assembled structures can lead to generation of either gold single crystal nanoplatelets or gold nanoparticles (when a reducing agent is added) decorating the nanotube and ribbon surfaces. The crystal-based organic-inorganic hybrids further assemble into 3D "sandwiched" structures.
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Affiliation(s)
- Cecile Lara
- Food and Soft Material Science, Institute of Food, Nutrition and Health, ETH Zürich, Schmelzbergstrasse 9, LFO, E23, 8092 Zürich, Switzerland
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196
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Vasilescu A, Gaspar S, Mihai I, Tache A, Litescu SC. Development of a label-free aptasensor for monitoring the self-association of lysozyme. Analyst 2013; 138:3530-7. [PMID: 23666516 DOI: 10.1039/c3an00229b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel aptamer and surface plasmon resonance (SPR)-based sensor was developed for the label-free detection of lysozyme. The aptasensor is characterised by a detection limit of 1 μg mL(-1) and a linear range of 5-50 μg mL(-1). As an application, we examined the usefulness of the aptasensor for monitoring the early stages of the aggregation of lysozyme. It was surprisingly found that, despite a significant decrease in monomer content during aggregation, the response of the aptasensor for protein solutions aged for 12 hours was similar to that for the fresh protein. To correlate the results obtained with the aptasensor with the composition of lysozyme solutions at various time points, we examined them in detail by atomic force microscopy (AFM), thioflavin T fluorescence, size-exclusion chromatography (SEC) and Matrix Assisted Laser Desorption Ionisation Time of Flight Mass Spectrometry (MALDI-TOF-MS). All methods together indicated that during the initial hours of aggregation, the protein solutions contained small lysozyme oligomers (mainly dimers) and decreasing amounts of monomers. Our results thus suggest that the aptamer also recognizes lysozyme dimers/oligomers. A higher non-specific binding was observed for the aggregated lysozyme at the surface of the aptasensor as compared to the native protein. This was attributed to the hydrophobic patches which are exposed by the unfolded lysozyme and/or oligomer species, allowing for different adsorption and organisation at the surface of the aptasensor. This hypothesis is supported by square wave voltammetry (SWV) studies using solutions of aggregated lysozyme. A higher electrochemical signal due to the direct oxidation of tyrosine/tryptophan residues was observed for aged protein solutions as compared to the fresh solution, indicative of an increased number of such exposed electroactive residues and of overall increased surface hydrophobicity of the protein. Our work presents a label-free lysozyme aptasensor that is useful not only for the detection of the protein monomer but also for observing the onset of aggregation. The approach can be extended to other proteins which are prone to aggregation.
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Affiliation(s)
- Alina Vasilescu
- International Centre of Biodynamics, 1B Intrarea Portocalelor, sector 6, 060101, Bucharest, Romania.
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197
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Liu J, Tang CH. Heat-induced fibril assembly of vicilin at pH2.0: Reaction kinetics, influence of ionic strength and protein concentration, and molecular mechanism. Food Res Int 2013. [DOI: 10.1016/j.foodres.2012.12.049] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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198
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(E)-2-Cyano-3-(5′-piperidin-1-yl-2,2′-bithien-5-yl)acrylic Acid: A Fluorescent Probe for Detecting Prefibrillar Oligomers. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300241] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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199
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Farkas V, Csordás B, Hegyi O, Tóth GK, Perczel A. Foldamer Stability Coupled to Aggregation Propensity of Elongated Trp-Cage Miniproteins. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300071] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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200
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Zou Y, Li Y, Hao W, Hu X, Ma G. Parallel β-sheet fibril and antiparallel β-sheet oligomer: new insights into amyloid formation of hen egg white lysozyme under heat and acidic condition from FTIR spectroscopy. J Phys Chem B 2013; 117:4003-13. [PMID: 23537140 DOI: 10.1021/jp4003559] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Hen egg white lysozyme (HEWL) is widely used as a model protein for amyloid research. In this study, we aim to use Fourier transform infrared (FTIR) spectroscopy to gain new structural insights into amyloid formation of HEWL under heat and acidic condition. We reveal that the fibril-forming solution of HEWL has the capability to form fibril and oligomer with distinct β-sheet configurations under different temperatures. Amyloid fibril with parallel β-sheet configuration is formed at elevated temperature, while oligomer with antiparallel β-sheet configuration is formed at room temperature. The interplay between fibrillation and oligomerization suggests that the two β-sheet aggregates consume the same amyloidogenic materials such as peptide fragments and nicked HEWL due to lysozyme hydrolysis under heat and acidic condition. Temperature-dependent FTIR reveals that the oligomer is unstable at elevated temperature, demonstrating its off-pathway nature. The temperature-dependent formation of parallel and antiparallel β-sheet configurations discovered in lysozyme system is compared with that of amyloid-β and α-synuclein systems and the implication is discussed.
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Affiliation(s)
- Ye Zou
- Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
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