1
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Baumann K, Šneiderienė G, Sanguanini M, Schneider M, Rimon O, González Díaz A, Greer H, Thacker D, Linse S, Knowles TPJ, Vendruscolo M. A Kinetic Map of the Influence of Biomimetic Lipid Model Membranes on Aβ 42 Aggregation. ACS Chem Neurosci 2022; 14:323-329. [PMID: 36574473 PMCID: PMC9853501 DOI: 10.1021/acschemneuro.2c00765] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The aggregation of the amyloid β (Aβ) peptide is one of the molecular hallmarks of Alzheimer's disease (AD). Although Aβ deposits have mostly been observed extracellularly, various studies have also reported the presence of intracellular Aβ assemblies. Because these intracellular Aβ aggregates might play a role in the onset and progression of AD, it is important to investigate their possible origins at different locations of the cell along the secretory pathway of the amyloid precursor protein, from which Aβ is derived by proteolytic cleavage. Senile plaques found in AD are largely composed of the 42-residue form of Aβ (Aβ42). Intracellularly, Aβ42 is produced in the endoplasmatic reticulum (ER) and Golgi apparatus. Since lipid bilayers have been shown to promote the aggregation of Aβ, in this study, we measure the effects of the lipid membrane composition on the in vitro aggregation kinetics of Aβ42. By using large unilamellar vesicles to model cellular membranes at different locations, including the inner and outer leaflets of the plasma membrane, late endosomes, the ER, and the Golgi apparatus, we show that Aβ42 aggregation is inhibited by the ER and Golgi model membranes. These results provide a preliminary map of the possible effects of the membrane composition in different cellular locations on Aβ aggregation and suggest the presence of an evolutionary optimization of the lipid composition to prevent the intracellular aggregation of Aβ.
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Affiliation(s)
- Kevin
N. Baumann
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Greta Šneiderienė
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Michele Sanguanini
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Matthias Schneider
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Oded Rimon
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Alicia González Díaz
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Heather Greer
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.
| | - Dev Thacker
- Department
of Biochemistry and Structural Biology, Lund University, LundSE22100, Sweden
| | - Sara Linse
- Department
of Biochemistry and Structural Biology, Lund University, LundSE22100, Sweden
| | - Tuomas P. J. Knowles
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.,Cavendish
Laboratory, University of Cambridge, CambridgeCB3 0HE, U.K.
| | - Michele Vendruscolo
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, CambridgeCB2 1EW, U.K.,
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2
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Vendruscolo M. Lipid Homeostasis and Its Links With Protein Misfolding Diseases. Front Mol Neurosci 2022; 15:829291. [PMID: 35401104 PMCID: PMC8990168 DOI: 10.3389/fnmol.2022.829291] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 01/31/2022] [Indexed: 12/30/2022] Open
Abstract
The maintenance of lipid homeostasis is essential for the normal functioning of living organisms. Alterations of the lipid homeostasis system remodel the composition of the lipidome, potentially leading to the formation of toxic lipid species. In turn, lipidome changes can affect the protein homeostasis system by causing perturbations that elicit protein condensation phenomena such as protein liquid-liquid phase separation and protein aggregation. Lipids can also be more directly involved the formation of aberrant condensed states of proteins by facilitating the early events that initiate these processes and by stabilizing the condensed states themselves. These observations suggest that lipid-induced toxicity can contribute to protein misfolding diseases, including Alzheimer’s and Parkinson’s diseases. According to this view, an impairment of the lipid homeostasis system generates toxic states of lipids that disturb the protein homeostasis system and promote the formation of toxic states of proteins.
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3
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Sanguanini M, Baumann KN, Preet S, Chia S, Habchi J, Knowles TPJ, Vendruscolo M. Complexity in Lipid Membrane Composition Induces Resilience to Aβ 42 Aggregation. ACS Chem Neurosci 2020; 11:1347-1352. [PMID: 32212722 DOI: 10.1021/acschemneuro.0c00101] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The molecular origins of Alzheimer's disease are associated with the aggregation of the amyloid-β peptide (Aβ). This process is controlled by a complex cellular homeostasis system, which involves a variety of components, including proteins, metabolites, and lipids. It has been shown in particular that certain components of lipid membranes can speed up Aβ aggregation. This observation prompts the question of whether there are protective cellular mechanisms to counterbalance this effect. Here, to address this issue, we investigate the role of the composition of lipid membranes in modulating the aggregation process of Aβ. By adopting a chemical kinetics approach, we first identify a panel of lipids that affect the aggregation of the 42-residue form of Aβ (Aβ42), ranging from enhancement to inhibition. We then show that these effects tend to average out in mixtures of these lipids, as such mixtures buffer extreme aggregation behaviors as the number of components increases. These results indicate that a degree of quality control on protein aggregation can be achieved through a mechanism by which an increase in the molecular complexity of lipid membranes balances opposite effects and creates resilience to aggregation.
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Affiliation(s)
- Michele Sanguanini
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Kevin N. Baumann
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Swapan Preet
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Sean Chia
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Johnny Habchi
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Tuomas P. J. Knowles
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Michele Vendruscolo
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
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4
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Wiglenda T, Groenke N, Hoffmann W, Manz C, Diez L, Buntru A, Brusendorf L, Neuendorf N, Schnoegl S, Haenig C, Schmieder P, Pagel K, Wanker EE. Sclerotiorin Stabilizes the Assembly of Nonfibrillar Abeta42 Oligomers with Low Toxicity, Seeding Activity, and Beta-sheet Content. J Mol Biol 2020; 432:2080-2098. [PMID: 32061932 DOI: 10.1016/j.jmb.2020.01.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 01/14/2020] [Accepted: 01/28/2020] [Indexed: 01/21/2023]
Abstract
The self-assembly of the 42-residue amyloid-β peptide, Aβ42, into fibrillar aggregates is associated with neuronal dysfunction and toxicity in Alzheimer's disease (AD) patient brains, suggesting that small molecules acting on this process might interfere with pathogenesis. Here, we present experimental evidence that the small molecule sclerotiorin (SCL), a natural product belonging to the group of azaphilones, potently delays both seeded and nonseeded Aβ42 polymerization in cell-free assays. Mechanistic biochemical studies revealed that the inhibitory effect of SCL on fibrillogenesis is caused by its ability to kinetically stabilize small Aβ42 oligomers. These structures exhibit low β-sheet content and do not possess seeding activity, indicating that SCL acts very early in the amyloid formation cascade before the assembly of seeding-competent, β-sheet-rich fibrillar aggregates. Investigations with NMR WaterLOGSY experiments confirmed the association of Aβ42 assemblies with SCL in solution. Furthermore, using ion mobility-mass spectrometry, we observed that SCL directly interacts with a small fraction of Aβ42 monomers in the gas phase. In comparison to typical amyloid fibrils, small SCL-stabilized Aβ42 assemblies are inefficiently taken up into mammalian cells and have low toxicity in cell-based assays. Overall, these mechanistic studies support a pathological role of stable, β-sheet-rich Aβ42 fibrils in AD, while structures with low β-sheet content may be less relevant.
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Affiliation(s)
- Thomas Wiglenda
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Nicole Groenke
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Waldemar Hoffmann
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - Christian Manz
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - Lisa Diez
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Alexander Buntru
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Lydia Brusendorf
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Nancy Neuendorf
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Sigrid Schnoegl
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Christian Haenig
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Peter Schmieder
- Leibniz-Institut für Molekulare Pharmakologie, Berlin, Germany
| | - Kevin Pagel
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - Erich E Wanker
- Neuroproteomics, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.
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5
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Takase H, Tanaka M, Nakamura Y, Morita SY, Yamada T, Mukai T. Effects of lipid composition on the structural properties of human serum amyloid A in reconstituted high-density lipoprotein particles. Chem Phys Lipids 2019; 221:8-14. [DOI: 10.1016/j.chemphyslip.2019.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 12/13/2022]
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6
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Howlett GJ, Ryan TM, Griffin MD. Lipid-apolipoprotein interactions in amyloid fibril formation and relevance to atherosclerosis. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:502-507. [DOI: 10.1016/j.bbapap.2018.08.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 08/06/2018] [Accepted: 08/27/2018] [Indexed: 01/08/2023]
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7
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Detergent-induced aggregation of an amyloidogenic intrinsically disordered protein. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1386-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Todorova N, Zlatic CO, Mao Y, Yarovsky I, Howlett GJ, Gooley PR, Griffin MDW. Intra- and Intersubunit Ion-Pair Interactions Determine the Ability of Apolipoprotein C-II Mutants To Form Hybrid Amyloid Fibrils. Biochemistry 2017; 56:1757-1767. [DOI: 10.1021/acs.biochem.6b01146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nevena Todorova
- School
of Engineering, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
| | - Courtney O. Zlatic
- Department
of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
- Bio21
Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yu Mao
- Department
of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
- Bio21
Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Irene Yarovsky
- School
of Engineering, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
| | - Geoffrey J. Howlett
- Department
of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
- Bio21
Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Paul R. Gooley
- Department
of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
- Bio21
Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Michael D. W. Griffin
- Department
of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
- Bio21
Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
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9
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Tanaka M, Nishimura A, Takeshita H, Takase H, Yamada T, Mukai T. Effect of lipid environment on amyloid fibril formation of human serum amyloid A. Chem Phys Lipids 2017; 202:6-12. [DOI: 10.1016/j.chemphyslip.2016.11.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 11/14/2016] [Accepted: 11/14/2016] [Indexed: 10/20/2022]
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10
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Nokwe CN, Hora M, Zacharias M, Yagi H, Peschek J, Reif B, Goto Y, Buchner J. A Stable Mutant Predisposes Antibody Domains to Amyloid Formation through Specific Non-Native Interactions. J Mol Biol 2016; 428:1315-1332. [DOI: 10.1016/j.jmb.2016.01.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/10/2016] [Accepted: 01/15/2016] [Indexed: 12/17/2022]
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11
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Ryan TM, Griffin MDW, McGillivray DJ, Knott RB, Wood K, Masters CL, Kirby N, Curtain CC. Apolipoprotein C-II Adopts Distinct Structures in Complex with Micellar and Submicellar Forms of the Amyloid-Inhibiting Lipid-Mimetic Dodecylphosphocholine. Biophys J 2016; 110:85-94. [PMID: 26745412 PMCID: PMC4805880 DOI: 10.1016/j.bpj.2015.11.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 11/03/2015] [Accepted: 11/09/2015] [Indexed: 01/21/2023] Open
Abstract
The formation of amyloid deposits is a common feature of a broad range of diseases, including atherosclerosis, Alzheimer's disease, and Parkinson's disease. The basis and role of amyloid deposition in the pathogenesis of these diseases is still being defined, however an interesting feature of amyloidogenic proteins is that the majority of the pathologically associated proteins are involved in lipid homeostasis, be it in lipid transport, incorporation into membranes, or the regulation of lipid pathways. Thus, amyloid-forming proteins commonly bind lipids, and lipids are generally involved in the proper folding of these proteins. However, understanding of the basis for these lipid-related aspects of amyloidogenesis is lacking. Thus, we have used the apolipoprotein C-II amyloid model system in conjunction with x-ray and neutron scattering analyses to address this problem. Apolipoprotein C-II is a well-studied model system of systemic amyloid fibril formation, with a clear and well-defined pathway for fibril formation, where the effects of lipid interaction are characterized, particularly for the lipid mimetic dodecylphosphocholine. We show that the micellar state of an inhibitory lipid can have a very significant effect on protein conformation, with micelles stabilizing a particular α-helical structure, whereas submicellar lipids stabilize a very different dimeric, α-helical structure. These results indicate that lipids may have an important role in the development and progression of amyloid-related diseases.
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Affiliation(s)
- Timothy M Ryan
- Australian Synchrotron, Clayton, Victoria, Australia; The Florey Institute, The University of Melbourne, Parkville, Victoria, Australia; The MacDiarmid Institute of Advanced Materials and Nanotechnology, Wellington, New Zealand.
| | - Michael D W Griffin
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Duncan J McGillivray
- School of Chemical Science, The University of Auckland, Auckland, New Zealand; The MacDiarmid Institute of Advanced Materials and Nanotechnology, Wellington, New Zealand
| | - Robert B Knott
- Australian Nuclear Science and Technology Organisation, New South Wales, Australia
| | - Kathleen Wood
- Australian Nuclear Science and Technology Organisation, New South Wales, Australia
| | - Colin L Masters
- The Florey Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Nigel Kirby
- Australian Synchrotron, Clayton, Victoria, Australia
| | - Cyril C Curtain
- The Florey Institute, The University of Melbourne, Parkville, Victoria, Australia
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12
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So M, Ishii A, Hata Y, Yagi H, Naiki H, Goto Y. Supersaturation-Limited and Unlimited Phase Spaces Compete to Produce Maximal Amyloid Fibrillation near the Critical Micelle Concentration of Sodium Dodecyl Sulfate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9973-9982. [PMID: 26291985 DOI: 10.1021/acs.langmuir.5b02186] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Although various natural and synthetic compounds have been shown to accelerate or inhibit the formation of amyloid fibrils, the mechanisms by which they achieve these adverse effects in a concentration-dependent manner currently remain unclear. Sodium dodecyl sulfate (SDS), one of the compounds that has adverse effects on fibrillation, is the most intensively studied. Here we examined the effects of a series of detergents including SDS on the amyloid fibrillation of β2-microglobulin at pH 7.0, a protein responsible for dialysis-related amyloidosis. In all the detergents examined (i.e., SDS, sodium decyl sulfate, sodium octyl sulfate, and sodium deoxycholate), amyloid fibrillation was accelerated and inhibited at concentrations near the critical micelle concentration (CMC) and higher than CMC, respectively. The most stable conformation changed from monomers with a β-structure to amyloid fibrils with a β-structure and then to α-helical complexes with micelles with an increase in detergent concentrations. These results suggest that competition between supersaturation-limited fibrillation and unlimited mixed micelle formation between proteins and micelles underlies the detergent concentration-dependent complexity of amyloid fibrillation.
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Affiliation(s)
- Masatomo So
- Institute for Protein Research, Osaka University , Osaka 565-0871, Japan
| | - Akira Ishii
- Institute for Protein Research, Osaka University , Osaka 565-0871, Japan
| | - Yasuko Hata
- Institute for Protein Research, Osaka University , Osaka 565-0871, Japan
| | - Hisashi Yagi
- Institute for Protein Research, Osaka University , Osaka 565-0871, Japan
| | - Hironobu Naiki
- Faculty of Medical Science, University of Fukui , Fukui 910-1193, Japan
| | - Yuji Goto
- Institute for Protein Research, Osaka University , Osaka 565-0871, Japan
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13
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Zlatic CO, Mao Y, Ryan TM, Mok YF, Roberts BR, Howlett GJ, Griffin MDW. Fluphenazine·HCl and Epigallocatechin Gallate Modulate the Rate of Formation and Structural Properties of Apolipoprotein C-II Amyloid Fibrils. Biochemistry 2015; 54:3831-8. [DOI: 10.1021/acs.biochem.5b00399] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Courtney O. Zlatic
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yu Mao
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Timothy M. Ryan
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yee-Foong Mok
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Blaine R. Roberts
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Geoffrey J. Howlett
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Michael D. W. Griffin
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
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14
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The Role of Lipid in Misfolding and Amyloid Fibril Formation by Apolipoprotein C-II. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 855:157-74. [DOI: 10.1007/978-3-319-17344-3_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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15
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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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16
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Khan JM, Abdulrehman SA, Zaidi FK, Gourinath S, Khan RH. Hydrophobicity alone can not trigger aggregation in protonated mammalian serum albumins. Phys Chem Chem Phys 2014; 16:5150-61. [DOI: 10.1039/c3cp54941k] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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17
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Gillam JE, MacPhee CE. Modelling amyloid fibril formation kinetics: mechanisms of nucleation and growth. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:373101. [PMID: 23941964 DOI: 10.1088/0953-8984/25/37/373101] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Amyloid and amyloid-like fibrils are self-assembling protein nanostructures, of interest for their robust material properties and inherent biological compatibility as well as their putative role in a number of debilitating mammalian disorders. Understanding fibril formation is essential to the development of strategies to control, manipulate or prevent fibril growth. As such, this area of research has attracted significant attention over the last half century. This review describes a number of different models that have been formulated to describe the kinetics of fibril assembly. We describe the macroscopic implications of mechanisms in which secondary processes such as secondary nucleation, fragmentation or branching dominate the assembly pathway, compared to mechanisms dominated by the influence of primary nucleation. We further describe how experimental data can be analysed with respect to the predictions of kinetic models.
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Affiliation(s)
- J E Gillam
- School of Physics and Astronomy, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, UK
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18
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Török B, Sood A, Bag S, Tulsan R, Ghosh S, Borkin D, Kennedy AR, Melanson M, Madden R, Zhou W, Levine H, Török M. Diaryl hydrazones as multifunctional inhibitors of amyloid self-assembly. Biochemistry 2013; 52:1137-48. [PMID: 23346953 DOI: 10.1021/bi3012059] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The design and application of an effective, new class of multifunctional small molecule inhibitors of amyloid self-assembly are described. Several compounds based on the diaryl hydrazone scaffold were designed. Forty-four substituted derivatives of this core structure were synthesized using a variety of benzaldehydes and phenylhydrazines and characterized. The inhibitor candidates were evaluated in multiple assays, including the inhibition of amyloid β (Aβ) fibrillogenesis and oligomer formation and the reverse processes, the disassembly of preformed fibrils and oligomers. Because the structure of the hydrazone-based inhibitors mimics the redox features of the antioxidant resveratrol, the radical scavenging effect of the compounds was evaluated by colorimetric assays against 2,2-diphenyl-1-picrylhydrazyl and superoxide radicals. The hydrazone scaffold was active in all of the different assays. The structure-activity relationship revealed that the substituents on the aromatic rings had a considerable effect on the overall activity of the compounds. The inhibitors showed strong activity in fibrillogenesis inhibition and disassembly, and even greater potency in the inhibition of oligomer formation and oligomer disassembly. Supporting the quantitative fluorometric and colorimetric assays, size exclusion chromatographic studies indicated that the best compounds practically eliminated or substantially inhibited the formation of soluble, aggregated Aβ species, as well. Atomic force microscopy was also applied to monitor the morphology of Aβ deposits. The compounds also possessed the predicted antioxidant properties; approximately 30% of the synthesized compounds showed a radical scavenging effect equal to or better than that of resveratrol or ascorbic acid.
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Affiliation(s)
- Béla Török
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, MA 02125-3393, USA
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Shaw BF, Schneider GF, Whitesides GM. Effect of surfactant hydrophobicity on the pathway for unfolding of ubiquitin. J Am Chem Soc 2012; 134:18739-45. [PMID: 23095057 DOI: 10.1021/ja3079863] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This paper describes the interaction between ubiquitin (UBI) and three sodium n-alkyl sulfates (SC(n)S) that have the same charge (Z = -1) but different hydrophobicity (n = 10, 12, or 14). Increasing the hydrophobicity of the n-alkyl sulfate resulted in (i) an increase in the number of distinct intermediates (that is, complexes of UBI and surfactant) that form along the pathway of unfolding, (ii) a decrease in the minimum concentrations of surfactant at which intermediates begin to form (i.e., a more negative ΔG(binding) of surfactant for UBI), and (iii) an increase in the number of surfactant molecules bound to UBI in each intermediate or complex. These results demonstrate that small changes in the hydrophobicity of a surfactant can significantly alter the binding interactions with a folded or unfolded cytosolic protein.
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Affiliation(s)
- Bryan F Shaw
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.
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20
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Ryan TM, Friedhuber A, Lind M, Howlett GJ, Masters C, Roberts BR. Small amphipathic molecules modulate secondary structure and amyloid fibril-forming kinetics of Alzheimer disease peptide Aβ(1-42). J Biol Chem 2012; 287:16947-54. [PMID: 22461629 DOI: 10.1074/jbc.m111.321778] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Amyloid fibril formation is associated with a number of debilitating systemic and neurodegenerative diseases. One of the most prominent is Alzheimer disease in which aggregation and deposition of the Aβ peptide occur. Aβ is widely considered to mediate the extensive neuronal loss observed in this disease through the formation of soluble oligomeric species, with the final fibrillar end product of the aggregation process being relatively inert. Factors that influence the aggregation of these amyloid-forming proteins are therefore very important. We have screened a library of 96 amphipathic molecules for effects on Aβ(1-42) aggregation and self-association. We find, using thioflavin T fluorescence and electron microscopy assays, that 30 of the molecules inhibit the aggregation process, whereas 36 activate fibril formation. Several activators and inhibitors were subjected to further analysis using analytical ultracentrifugation and circular dichroism. Activators typically display a 1:10 peptide:detergent stoichiometry for maximal activation, whereas the inhibitors are effective at a 1:1 stoichiometry. Analytical ultracentrifugation and circular dichroism experiments show that activators promote a mixture of unfolded and β-sheet structures and rapidly form large aggregates, whereas inhibitors induce α-helical structures that form stable dimeric/trimeric oligomers. The results suggest that Aβ(1-42) contains at least one small molecule binding site, which modulates the secondary structure and aggregation processes. Further studies of the binding of these compounds to Aβ may provide insight for developing therapeutic strategies aimed at stabilizing Aβ in a favorable conformation.
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Affiliation(s)
- Timothy M Ryan
- Mental Health Research Institute, the University of Melbourne, Parkville, Victoria 3010, Australia
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21
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Yang S, Griffin MDW, Binger KJ, Schuck P, Howlett GJ. An equilibrium model for linear and closed-loop amyloid fibril formation. J Mol Biol 2012; 421:364-77. [PMID: 22370559 DOI: 10.1016/j.jmb.2012.02.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 02/08/2012] [Accepted: 02/18/2012] [Indexed: 11/30/2022]
Abstract
Amyloid fibrils and their soluble oligomeric intermediates are implicated in several age-related diseases including Alzheimer's and Parkinson's diseases. The distribution of oligomers and fibrils is related to toxicity and is dependent on the pathways for fibril assembly, generally considered to occur via a slow nucleation step that precedes fibril elongation. Human apolipoprotein (apo) C-II forms amyloid fibrils via a reversible self-assembly process accompanied by closed-loop formation and fibril breaking and joining. Our fluorescence quenching and sedimentation velocity experiments with Alexa488-labeled apoC-II indicated a time-dependent subunit interchange for both linear and closed-loop fibrils, while dilution experiments using mature fibrils indicated a shift to smaller size distributions consistent with a reversible assembly pathway. To account for this behavior, we developed an equilibrium self-association model that describes the final size distributions of apoC-II fibrils formed at different starting concentrations. The model proposes a reversible isomerization of apoC-II monomer to form an active conformer that self-assembles into fibrils via an isodesmic self-association pathway coupled to fibril length-dependent closed-loop formation. The model adequately described fibril size distributions and the proportion of closed loops as a function of total apoC-II concentration over the concentration range 0.1-0.5 mg/ml. Extension of the model to include the rates of isomerization, self-association and fibril breaking and joining provided satisfactory global fits to kinetic data on fibril formation and changes in average fibril size at different apoC-II starting concentrations. The model provides a simple thermodynamic description of the processes governing the size distribution of apoC-II fibrils at equilibrium and the formation of discrete oligomeric intermediates.
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Affiliation(s)
- Shuo Yang
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria 3010, Australia
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22
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Härd T, Lendel C. Inhibition of amyloid formation. J Mol Biol 2012; 421:441-65. [PMID: 22244855 DOI: 10.1016/j.jmb.2011.12.062] [Citation(s) in RCA: 215] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 12/28/2011] [Accepted: 12/29/2011] [Indexed: 12/26/2022]
Abstract
Amyloid is aggregated protein in the form of insoluble fibrils. Amyloid deposition in human tissue-amyloidosis-is associated with a number of diseases including all common dementias and type II diabetes. Considerable progress has been made to understand the mechanisms leading to amyloid formation. It is, however, not yet clear by which mechanisms amyloid and protein aggregates formed on the path to amyloid are cytotoxic. Strategies to prevent protein aggregation and amyloid formation are nevertheless, in many cases, promising and even successful. This review covers research on intervention of amyloidosis and highlights several examples of how inhibition of protein aggregation and amyloid formation has been achieved in practice. For instance, rational design can provide drugs that stabilize a native folded state of a protein, protein engineering can provide new binding proteins that sequester monomeric peptides from aggregation, small molecules and peptides can be designed to block aggregation or direct it into non-cytotoxic paths, and monoclonal antibodies have been developed for therapies towards neurodegenerative diseases based on inhibition of amyloid formation and clearance.
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Affiliation(s)
- Torleif Härd
- Department of Molecular Biology, Swedish University of Agricultural Sciences, SE-751 24 Uppsala, Sweden.
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23
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Abelein A, Bolognesi B, Dobson CM, Gräslund A, Lendel C. Hydrophobicity and conformational change as mechanistic determinants for nonspecific modulators of amyloid β self-assembly. Biochemistry 2011; 51:126-37. [PMID: 22133042 DOI: 10.1021/bi201745g] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The link between many neurodegenerative disorders, including Alzheimer's and Parkinson's diseases, and the aberrant folding and aggregation of proteins has prompted a comprehensive search for small organic molecules that have the potential to inhibit such processes. Although many compounds have been reported to affect the formation of amyloid fibrils and/or other types of protein aggregates, the mechanisms by which they act are not well understood. A large number of compounds appear to act in a nonspecific way affecting several different amyloidogenic proteins. We describe here a detailed study of the mechanism of action of one representative compound, lacmoid, in the context of the inhibition of the aggregation of the amyloid β-peptide (Aβ) associated with Alzheimer's disease. We show that lacmoid binds Aβ(1-40) in a surfactant-like manner and counteracts the formation of all types of Aβ(1-40) and Aβ(1-42) aggregates. On the basis of these and previous findings, we are able to rationalize the molecular mechanisms of action of nonspecific modulators of protein self-assembly in terms of hydrophobic attraction and the conformational preferences of the polypeptide.
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Affiliation(s)
- Axel Abelein
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius v. 16, SE-106 91 Stockholm, Sweden
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24
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Tejaswi Naidu K, Prakash Prabhu N. Protein–Surfactant Interaction: Sodium Dodecyl Sulfate-Induced Unfolding of Ribonuclease A. J Phys Chem B 2011; 115:14760-7. [DOI: 10.1021/jp2062496] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Tejaswi Naidu
- Department of Biotechnology, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India
| | - N. Prakash Prabhu
- Department of Biotechnology, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India
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25
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Ryan TM, Griffin MDW, Bailey MF, Schuck P, Howlett GJ. NBD-labeled phospholipid accelerates apolipoprotein C-II amyloid fibril formation but is not incorporated into mature fibrils. Biochemistry 2011; 50:9579-86. [PMID: 21985034 DOI: 10.1021/bi201192r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Human apolipoprotein (apo) C-II is one of several lipid-binding proteins that self-assemble into fibrils and accumulate in disease-related amyloid deposits. A general characteristic of these amyloid deposits is the presence of lipids, known to modulate individual steps in amyloid fibril formation. ApoC-II fibril formation is activated by submicellar phospholipids but inhibited by micellar lipids. We examined the mechanism for the activation by submicellar lipids using the fluorescently labeled, short-chain phospholipid 1-dodecyl-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]-2-hydroxyglycero-3-phosphocholine (NBD-lyso-12-PC). Addition of submicellar NBD-lyso-12-PC increased the rate of fibril formation by apoC-II approximately 2-fold. Stopped flow kinetic analysis using fluorescence detection and low, non-fibril-forming concentrations of apoC-II indicated NBD-lyso-12-PC binds rapidly, on the millisecond time scale, followed by the slower formation of discrete apoC-II tetramers. Sedimentation velocity analysis showed NBD-lyso-12-PC binds to both apoC-II monomers and tetramers at approximately five sites per monomer with an average dissociation constant of approximately 10 μM. Mature apoC-II fibrils formed in the presence of NBD-lyso-12-PC were devoid of lipid, indicating a purely catalytic role for submicellar lipids in the activation of apoC-II fibril formation. These studies demonstrate the catalytic potential of small amphiphilic molecules in controlling protein folding and fibril assembly pathways.
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Affiliation(s)
- Timothy M Ryan
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
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26
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Teoh CL, Griffin MDW, Howlett GJ. Apolipoproteins and amyloid fibril formation in atherosclerosis. Protein Cell 2011; 2:116-27. [PMID: 21400045 DOI: 10.1007/s13238-011-1013-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 01/29/2011] [Indexed: 10/18/2022] Open
Abstract
Amyloid fibrils arise from the aggregation of misfolded proteins into highly-ordered structures. The accumulation of these fibrils along with some non-fibrillar constituents within amyloid plaques is associated with the pathogenesis of several human degenerative diseases. A number of plasma apolipoproteins, including apolipoprotein (apo) A-I, apoA-II, apoC-II and apoE are implicated in amyloid formation or influence amyloid formation by other proteins. We review present knowledge of amyloid formation by apolipoproteins in disease, with particular focus on atherosclerosis. Further insights into the molecular mechanisms underlying their amyloidogenic propensity are obtained from in vitro studies which describe factors affecting apolipoprotein amyloid fibril formation and interactions. Additionally, we outline the evidence that amyloid fibril formation by apolipoproteins might play a role in the development and progression of atherosclerosis, and highlight possible molecular mechanisms that could contribute to the pathogenesis of this disease.
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Affiliation(s)
- Chai Lean Teoh
- Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
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