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Kobayashi R, Nabika H. Liquid-liquid phase separation induced by crowding condition affects amyloid-β aggregation mechanism. SOFT MATTER 2024; 20:5331-5342. [PMID: 38847095 DOI: 10.1039/d4sm00470a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Liquid-liquid phase separation (LLPS) is common in the aggregation of proteins associated with neurodegenerative diseases. Many efforts have been made to reproduce crowded conditions with artificial polymeric materials to understand the effect of LLPS in physiological conditions with significantly highly concentrated proteins, such as intrinsically disordered proteins. Although the possibility that LLPS is involved in intracellular amyloid-β (Aβ) aggregation, a protein related to the pathogenesis of Alzheimer's disease, has been investigated, the relationship between LLPS and the aggregation of Aβ is poorly characterized. Thus, in this study, we mimicked the intracellular crowding environment using polyethylene glycol and dextran, used commonly as model polymers, to examine the relationship of Aβ with LLPS and aggregation dynamics in vitro. We confirmed that Aβ undergoes LLPS under specific polymer coexistence conditions. Moreover, the addition of different electrolytes modulated LLPS and fibril formation. These results suggest that hydrophobic and electrostatic interactions are the driving forces for the LLPS of Aβ. Similar to the role of the liposome interface, the interface of droplets induced by LLPS functioned as the site for heterogeneous nucleation. These findings offer valuable insights into the complex mechanisms of Aβ aggregation in vivo and may be useful in establishing therapeutic methods for Alzheimer's disease.
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Affiliation(s)
- Ryuki Kobayashi
- Department of Science, Graduate School of Science and Engineering, Yamagata University, 1-4-12, Kojirakawa, Yamagata 990-8560, Japan
| | - Hideki Nabika
- Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
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2
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Su H, Masters CL, Bush AI, Barnham KJ, Reid GE, Vella LJ. Exploring the significance of lipids in Alzheimer's disease and the potential of extracellular vesicles. Proteomics 2024; 24:e2300063. [PMID: 37654087 DOI: 10.1002/pmic.202300063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 08/07/2023] [Accepted: 08/14/2023] [Indexed: 09/02/2023]
Abstract
Lipids play a significant role in maintaining central nervous system (CNS) structure and function, and the dysregulation of lipid metabolism is known to occur in many neurological disorders, including Alzheimer's disease. Here we review what is currently known about lipid dyshomeostasis in Alzheimer's disease. We propose that small extracellular vesicle (sEV) lipids may provide insight into the pathophysiology and progression of Alzheimer's disease. This stems from the recognition that sEV likely contributes to disease pathogenesis, but also an understanding that sEV can serve as a source of potential biomarkers. While the protein and RNA content of sEV in the CNS diseases have been studied extensively, our understanding of the lipidome of sEV in the CNS is still in its infancy.
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Affiliation(s)
- Huaqi Su
- The Florey, The University of Melbourne, Parkville, Victoria, Australia
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
| | - Colin L Masters
- The Florey, The University of Melbourne, Parkville, Victoria, Australia
| | - Ashley I Bush
- The Florey, The University of Melbourne, Parkville, Victoria, Australia
| | - Kevin J Barnham
- The Florey, The University of Melbourne, Parkville, Victoria, Australia
| | - Gavin E Reid
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Victoria, Australia
| | - Laura J Vella
- The Florey, The University of Melbourne, Parkville, Victoria, Australia
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Victoria, Australia
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3
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Kalita K, Phukan SJ, Garai S, Sankaranarayanan K. Polyoxometalates Mediated Amyloid Fibrillation Dynamics and Restoration of Enzyme Activity of Hen Egg White Lysozyme Treated under Cold Atmospheric Pressure Plasma. ACS OMEGA 2024; 9:3423-3429. [PMID: 38284079 PMCID: PMC10809371 DOI: 10.1021/acsomega.3c06921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 01/30/2024]
Abstract
Neurodegenerative disorders are one of the most devastating disorders worldwide. Although a definite mechanistic pathway of neurodegenerative disorders is still not clear, it is almost clear that these diseases are initiated by protein misfolding. Hen Egg White Lysozyme (Lyz) can be converted to highly arranged amyloid fibrils and is therefore considered a good model protein for studying protein aggregation in connection to neurodegeneration. In this study, Lyz has been converted to fibrils using He-air gas fed single jet cold atmospheric plasma (CAP). The reactive oxygen species and the reactive nitrogen species produced by the plasma jet interact with the protein molecules and enhance the fibril formation. We monitored the fibrillation kinetics with the Thioflavin T (ThT) assay and observed that fibrils are formed when the samples are treated for 10 min with He-air gas fed CAP. Further, we studied the role of a special class of inorganic nanomaterials called polyoxometalates (POMs) in the process of the Lyz fibrillation using various biophysical techniques. The Keggin POMs used in this study are phosphomolybdic acid (PMA) and silico molybdic acid (SMA). Keggin POMs bring in structural self-assembly of the protein and disrupt the fibrils as evidenced in the ThT assay and TEM analysis. Molecular docking studies together with electrokinetic potential studies show the interactions between POMs and Lyz dominated via hydrogen bonding and electrostatic interactions. The enzyme activity of Lyz was assessed using the substrate Micrococcus lysodeikticus and after treatment with POMs results showed a significant increase in the activity. This study could pave way for looking into Keggin POMs for possible application in neurodegeneration.
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Affiliation(s)
- Kaberi Kalita
- Physical
Sciences Division, Institute of Advanced
Study in Science and Technology (An Autonomous Institute Under DST,
Government of India), Vigyan Path, Paschim Boragaon, Garchuk, Guwahati, Assam 781035, India
| | - Shankab J. Phukan
- Department
of Chemistry, Institute of Science, Banaras
Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Somenath Garai
- Department
of Chemistry, Institute of Science, Banaras
Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Kamatchi Sankaranarayanan
- Physical
Sciences Division, Institute of Advanced
Study in Science and Technology (An Autonomous Institute Under DST,
Government of India), Vigyan Path, Paschim Boragaon, Garchuk, Guwahati, Assam 781035, India
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4
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Kolmogorov VS, Erofeev AS, Barykin EP, Timoshenko RV, Lopatukhina EV, Kozin SA, Gorbacheva LR, Salikhov SV, Klyachko NL, Mitkevich VA, Edwards CRW, Korchev YE, Makarov AA, Gorelkin PV. Scanning Ion-Conductance Microscopy for Studying β-Amyloid Aggregate Formation on Living Cell Surfaces. Anal Chem 2023; 95:15943-15949. [PMID: 37856787 DOI: 10.1021/acs.analchem.3c02806] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
β-Amyloid aggregation on living cell surfaces is described as responsible for the neurotoxicity associated with different neurodegenerative diseases. It is suggested that the aggregation of β-amyloid (Aβ) peptide on neuronal cell surface leads to various deviations of its vital function due to myriad pathways defined by internalization of calcium ions, apoptosis promotion, reduction of membrane potential, synaptic activity loss, etc. These are associated with structural reorganizations and pathologies of the cell cytoskeleton mainly involving actin filaments and microtubules and consequently alterations of cell mechanical properties. The effect of amyloid oligomers on cells' Young's modulus has been observed in a variety of studies. However, the precise connection between the formation of amyloid aggregates on cell membranes and their effects on the local mechanical properties of living cells is still unresolved. In this work, we have used correlative scanning ion-conductance microscopy (SICM) to study cell topography, Young's modulus mapping, and confocal imaging of Aβ aggregate formation on living cell surfaces. However, it is well-known that the cytoskeleton state is highly connected to the intracellular level of reactive oxygen species (ROS). The effect of Aβ leads to the induction of oxidative stress, actin polymerization, and stress fiber formation. We measured the reactive oxygen species levels inside single cells using platinum nanoelectrodes to demonstrate the connection of ROS and Young's modulus of cells. SICM can be successfully applied to studying the cytotoxicity mechanisms of Aβ aggregates on living cell surfaces.
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Affiliation(s)
- Vasilii S Kolmogorov
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
- Lomonosov Moscow State University, 119991 Moscow, Russian Federation
| | - Alexander S Erofeev
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
| | - Evgeny P Barykin
- Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | - Roman V Timoshenko
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
| | - Elena V Lopatukhina
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
| | - Sergey A Kozin
- Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | - Lyubov R Gorbacheva
- Lomonosov Moscow State University, 119991 Moscow, Russian Federation
- Pirogov Russian National Research Medical University, 117997 Moscow, Russian Federation
| | - Sergey V Salikhov
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
| | | | - Vladimir A Mitkevich
- Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | | | - Yuri E Korchev
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, 920-1192 Kanazawa, Japan
- Department of Medicine, Imperial College London, SW7 2AZ London, United Kingdom
| | - Alexander A Makarov
- Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | - Petr V Gorelkin
- National University of Science and Technology "MISIS", 119049 Moscow, Russian Federation
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5
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The interactions of amyloid β aggregates with phospholipid membranes and the implications for neurodegeneration. Biochem Soc Trans 2023; 51:147-159. [PMID: 36629697 DOI: 10.1042/bst20220434] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 01/12/2023]
Abstract
Misfolding, aggregation and accumulation of Amyloid-β peptides (Aβ) in neuronal tissue and extracellular matrix are hallmark features of Alzheimer's disease (AD) pathology. Soluble Aβ oligomers are involved in neuronal toxicity by interacting with the lipid membrane, compromising its integrity, and affecting the function of receptors. These facts indicate that the interaction between Aβ oligomers and cell membranes may be one of the central molecular level factors responsible for the onset of neurodegeneration. The present review provides a structural understanding of Aβ neurotoxicity via membrane interactions and contributes to understanding early events in Alzheimer's disease.
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6
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Saha J, Bose P, Dhakal S, Ghosh P, Rangachari V. Ganglioside-Enriched Phospholipid Vesicles Induce Cooperative Aβ Oligomerization and Membrane Disruption. Biochemistry 2022; 61:2206-2220. [PMID: 36173882 PMCID: PMC9840156 DOI: 10.1021/acs.biochem.2c00495] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A major hallmark of Alzheimer's disease (AD) is the accumulation of extracellular aggregates of amyloid-β (Aβ). Structural polymorphism observed among Aβ fibrils in AD brains seem to correlate with the clinical subtypes suggesting a link between fibril polymorphism and pathology. Since fibrils emerge from a templated growth of low-molecular-weight oligomers, understanding the factors affecting oligomer generation is important. Membrane lipids are key factors to influence early stages of Aβ aggregation and oligomer generation, which cause membrane disruption. We have previously demonstrated that conformationally discrete Aβ oligomers can be generated by modulating the charge, composition, and chain length of lipids and surfactants. Here, we extend our studies into liposomal models by investigating Aβ oligomerization on large unilamellar vesicles (LUVs) of total brain extracts (TBE), reconstituted lipid rafts (LRs), or 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). Varying the vesicle composition by specifically increasing the amount of GM1 gangliosides as a constituent, we found that only GM1-enriched liposomes induce the formation of toxic, low-molecular-weight oligomers. Furthermore, we found that the aggregation on liposome surface and membrane disruption are highly cooperative and sensitive to membrane surface characteristics. Numerical simulations confirm such a cooperativity and reveal that GM1-enriched liposomes form twice as many pores as those formed in the absence GM1. Overall, this study uncovers mechanisms of cooperativity between oligomerization and membrane disruption under controlled lipid compositional bias, and refocuses the significance of the early stages of Aβ aggregation in polymorphism, propagation, and toxicity in AD.
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Affiliation(s)
- Jhinuk Saha
- Department of Chemistry and Biochemistry, School of Mathematics and Natural Sciences, University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States
| | - Priyankar Bose
- Department of Computer Science, Virginia Commonwealth University, Richmond, Virginia 23220, United States
| | - Shailendra Dhakal
- Center for Molecular and Cellular Biosciences, University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States
| | - Preetam Ghosh
- Department of Computer Science, Virginia Commonwealth University, Richmond, Virginia 23220, United States
| | - Vijayaraghavan Rangachari
- Department of Chemistry and Biochemistry, School of Mathematics and Natural Sciences, University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States; Center for Molecular and Cellular Biosciences, University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States
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7
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Kenyaga JM, Cheng Q, Qiang W. Early-Stage β-Amyloid-Membrane Interactions Modulate Lipid Dynamics and Influence Structural Interfaces and Fibrillation. J Biol Chem 2022; 298:102491. [PMID: 36115457 PMCID: PMC9556791 DOI: 10.1016/j.jbc.2022.102491] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 09/07/2022] [Accepted: 09/09/2022] [Indexed: 11/02/2022] Open
Abstract
Molecular interactions between β-amyloid (Aβ) peptide and membranes contribute to the neuronal toxicity of Aβ and the pathology of Alzheimer's disease (AD). Neuronal plasma membranes serve as biologically relevant environments for the Aβ aggregation process as well as affect the structural polymorphisms of Aβ aggregates. However, the nature of these interactions is unknown. Here, we utilized solid-state NMR spectroscopy to explore the site-specific interactions between Aβ peptides and lipids in synaptic plasma membranes at the membrane-associated nucleation stage. The key results show that different segments in the hydrophobic sequence of Aβ initiate membrane binding and inter-strand assembling. We demonstrate early-stage Aβ-lipid interactions modulate lipid dynamics, leading to more rapid lipid headgroup motion and reduced lateral diffusive motion. These early events influence the structural polymorphisms of yielded membrane-associated Aβ fibrils with distinct C-terminal quaternary interface structure compared to fibrils grown in aqueous solutions. Based on our results, we propose a schematic mechanism by which Aβ-lipid interactions drive membrane-associated nucleation processes, providing molecular insights into the early events of fibrillation in biological environments.
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Affiliation(s)
- June M Kenyaga
- Department of Chemistry, Binghamton University, the State University of New York
| | - Qinghui Cheng
- Department of Chemistry, Binghamton University, the State University of New York
| | - Wei Qiang
- Department of Chemistry, Binghamton University, the State University of New York.
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8
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The Association of Lipids with Amyloid Fibrils. J Biol Chem 2022; 298:102108. [PMID: 35688209 PMCID: PMC9293637 DOI: 10.1016/j.jbc.2022.102108] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 05/31/2022] [Accepted: 06/03/2022] [Indexed: 01/02/2023] Open
Abstract
Amyloid formation continues to be a widely studied area because of its association with numerous diseases, such as Alzheimer’s and Parkinson’s diseases. Despite a large body of work on protein aggregation and fibril formation, there are still significant gaps in our understanding of the factors that differentiate toxic amyloid formation in vivo from alternative misfolding pathways. In addition to proteins, amyloid fibrils are often associated in their cellular context with several types of molecule, including carbohydrates, polyanions, and lipids. This review focuses in particular on evidence for the presence of lipids in amyloid fibrils and the routes by which those lipids may become incorporated. Chemical analyses of fibril composition, combined with studies to probe the lipid distribution around fibrils, provide evidence that in some cases, lipids have a strong association with fibrils. In addition, amyloid fibrils formed in the presence of lipids have distinct morphologies and material properties. It is argued that lipids are an integral part of many amyloid deposits in vivo, where their presence has the potential to influence the nucleation, morphology, and mechanical properties of fibrils. The role of lipids in these structures is therefore worthy of further study.
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9
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Khan JM, Malik A, Ahmed MZ, Ahmed A. SDS modulates amyloid fibril formation and conformational change in succinyl-ConA at low pH. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 267:120494. [PMID: 34689006 DOI: 10.1016/j.saa.2021.120494] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 10/04/2021] [Accepted: 10/08/2021] [Indexed: 06/13/2023]
Abstract
The anionic surfactant sodium dodecyl sulfate (SDS) is homologous to the cellular membrane lipids, and is known to stimulate amyloid fibrillation in several proteins. However, the mechanism by which SDS influences aggregation and structural changes in succinylated protein has not been determined. In this study, we observed the effects of variable SDS concentrations on succinyl-ConA aggregation at pH 3.5 and proposed a possible mechanism of SDS-induced succinyl-ConA aggregation. We used several biophysical techniques to identify the changes caused by SDS. Our results suggest that SDS stimulates succinyl-ConA aggregation in a concentration-dependent manner. From turbidity measurements, it was evident that a very low concentration (<0.1 mM) of SDS did not induce succinyl-ConA aggregation and proteins remained soluble. However, aggregations were observed at 0.1-2.5 mM SDS, which then dissipated at SDS concentrations above 2.5 mM. Far-UV CD results suggest that the β-sheet secondary structure of succinyl-ConA transformed into the cross-β-sheet structure in the presence of aggregating SDS concentrations. Notably, at SDS concentrations above 2.5 mM, the succinyl-ConA β-sheet transformed into an α-helical structure. The SDS-induced succinyl-ConA amyloid-like aggregates were confirmed by transmission electron microscopy (TEM). We propose that SDS modulates amyloid fibrillation in succinyl-ConA due to electrostatic and hydrophobic interactions and succinylation affects SDS-induced succinyl-ConA aggregation.
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Affiliation(s)
- Javed Masood Khan
- Department of Food Science and Nutrition, Faculty of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia.
| | - Ajamaluddin Malik
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mohammad Z Ahmed
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Anwar Ahmed
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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10
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Andrade S, Loureiro JA, Pereira MC. The Role of Amyloid β-Biomembrane Interactions in the Pathogenesis of Alzheimer's Disease: Insights from Liposomes as Membrane Models. Chemphyschem 2021; 22:1547-1565. [PMID: 34086399 DOI: 10.1002/cphc.202100124] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/10/2021] [Indexed: 02/06/2023]
Abstract
The aggregation and deposition of amyloid β (Aβ) peptide onto neuronal cells, with consequent cellular membrane perturbation, are central to the pathogenesis of Alzheimer's disease (AD). Substantial evidence reveals that biological membranes play a key role in this process. Thus, elucidating the mechanisms by which Aβ interacts with biomembranes and becomes neurotoxic is fundamental to developing effective therapies for this devastating progressive disease. However, the structural basis behind such interactions is not fully understood, largely due to the complexity of natural membranes. In this context, lipid biomembrane models provide a simplified way to mimic the characteristics and composition of membranes. Aβ-biomembrane interactions have been extensively investigated applying artificial membrane models to elucidate the molecular mechanisms underlying the AD pathogenesis. This review summarizes the latest findings on this field using liposomes as biomembrane model, as they are considered the most promising 3D model. The current challenges and future directions are discussed.
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Affiliation(s)
- Stéphanie Andrade
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
| | - Joana Angélica Loureiro
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
| | - Maria Carmo Pereira
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal
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11
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Fu R, Rooney MT, Zhang R, Cotten ML. Coordination of Redox Ions within a Membrane-Binding Peptide: A Tale of Aromatic Rings. J Phys Chem Lett 2021; 12:4392-4399. [PMID: 33939920 DOI: 10.1021/acs.jpclett.1c00636] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The amino-terminal-copper-and-nickel-binding (ATCUN) motif, a tripeptide sequence ending with a histidine, confers important functions to proteins and peptides. Few high-resolution studies have been performed on the ATCUN motifs of membrane-associated proteins and peptides, limiting our understanding of how they stabilize Cu2+/Ni2+ in membranes. Here, we leverage solid-state NMR to investigate metal-binding to piscidin-1 (P1), a host-defense peptide featuring F1F2H3 as its ATCUN motif. Bound to redox ions, P1 chemically and physically damages pathogenic cell membranes. We design 13C/15N correlation experiments to detect and assign the deprotonated nitrogens produced and/or shifted by Ni2+-binding. Occupying multiple chemical states in P1-apo, H3 and the neighboring H4 respond to metalation by populating only the τ-tautomer. H3, as a proximal histidine, directly coordinates the metal, compared to the distal H4. Density functional theory calculations reflect this noncanonical arrangement and point toward cation-π interactions between the F1/F2/H4 aromatic rings and metal. These structural findings, which are relevant to other ATCUN-containing membrane peptides, could help design new therapeutics and materials for use in the areas of drug-resistant bacteria, neurological disorders, and biomedical imaging.
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Affiliation(s)
- Riqiang Fu
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Mary T Rooney
- Department of Applied Science, William & Mary, Williamsburg, Virginia 23185, United States
| | - Rongfu Zhang
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Myriam L Cotten
- Department of Applied Science, William & Mary, Williamsburg, Virginia 23185, United States
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12
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Chang Z, Deng J, Zhao W, Yang J. Exploring interactions between lipids and amyloid-forming proteins: A review on applying fluorescence and NMR techniques. Chem Phys Lipids 2021; 236:105062. [PMID: 33600803 DOI: 10.1016/j.chemphyslip.2021.105062] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/27/2021] [Accepted: 02/12/2021] [Indexed: 12/13/2022]
Abstract
A hallmark of Alzheimer's, Parkinson's, and other amyloid diseases is the assembly of amyloid proteins into amyloid aggregates or fibrils. In many cases, the formation and cytotoxicity of amyloid assemblies are associated with their interaction with cell membranes. Despite studied for many years, the characterization of the interaction is challenged for reasons on the multiple aggregation states of amyloid-forming proteins, transient and weak interactions in the complex system. Although several strategies such as computation biology, spectroscopy, and imaging methods have been performed, there is an urgent need to detail the molecular mechanism in different time scales and high resolutions. This review highlighted the recent applications of fluorescence, solution and solid-state NMR in exploring the interactions between amyloid protein and membranes attributing to their advantages of high sensitivity and atomic resolution.
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Affiliation(s)
- Ziwei Chang
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China
| | - Jing Deng
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Weijing Zhao
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China
| | - Jun Yang
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
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13
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Reif B, Ashbrook SE, Emsley L, Hong M. Solid-state NMR spectroscopy. NATURE REVIEWS. METHODS PRIMERS 2021; 1:2. [PMID: 34368784 PMCID: PMC8341432 DOI: 10.1038/s43586-020-00002-1] [Citation(s) in RCA: 168] [Impact Index Per Article: 56.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/29/2020] [Indexed: 12/18/2022]
Abstract
Solid-state nuclear magnetic resonance (NMR) spectroscopy is an atomic-level method used to determine the chemical structure, three-dimensional structure, and dynamics of solids and semi-solids. This Primer summarizes the basic principles of NMR as applied to the wide range of solid systems. The fundamental nuclear spin interactions and the effects of magnetic fields and radiofrequency pulses on nuclear spins are the same as in liquid-state NMR. However, because of the anisotropy of the interactions in the solid state, the majority of high-resolution solid-state NMR spectra is measured under magic-angle spinning (MAS), which has profound effects on the types of radiofrequency pulse sequences required to extract structural and dynamical information. We describe the most common MAS NMR experiments and data analysis approaches for investigating biological macromolecules, organic materials, and inorganic solids. Continuing development of sensitivity-enhancement approaches, including 1H-detected fast MAS experiments, dynamic nuclear polarization, and experiments tailored to ultrahigh magnetic fields, is described. We highlight recent applications of solid-state NMR to biological and materials chemistry. The Primer ends with a discussion of current limitations of NMR to study solids, and points to future avenues of development to further enhance the capabilities of this sophisticated spectroscopy for new applications.
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Affiliation(s)
- Bernd Reif
- Technische Universität München, Department Chemie, Lichtenbergstr. 4, D-85747 Garching, Germany
| | - Sharon E. Ashbrook
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, UK
| | - Lyndon Emsley
- École Polytechnique Fédérale de Lausanne (EPFL), Institut des sciences et ingénierie chimiques, CH-1015 Lausanne, Switzerland
| | - Mei Hong
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139
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14
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Ulamec SM, Brockwell DJ, Radford SE. Looking Beyond the Core: The Role of Flanking Regions in the Aggregation of Amyloidogenic Peptides and Proteins. Front Neurosci 2020; 14:611285. [PMID: 33335475 PMCID: PMC7736610 DOI: 10.3389/fnins.2020.611285] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 11/02/2020] [Indexed: 12/14/2022] Open
Abstract
Amyloid proteins are involved in many neurodegenerative disorders such as Alzheimer’s disease [Tau, Amyloid β (Aβ)], Parkinson’s disease [alpha-synuclein (αSyn)], and amyotrophic lateral sclerosis (TDP-43). Driven by the early observation of the presence of ordered structure within amyloid fibrils and the potential to develop inhibitors of their formation, a major goal of the amyloid field has been to elucidate the structure of the amyloid fold at atomic resolution. This has now been achieved for a wide variety of sequences using solid-state NMR, microcrystallography, X-ray fiber diffraction and cryo-electron microscopy. These studies, together with in silico methods able to predict aggregation-prone regions (APRs) in protein sequences, have provided a wealth of information about the ordered fibril cores that comprise the amyloid fold. Structural and kinetic analyses have also shown that amyloidogenic proteins often contain less well-ordered sequences outside of the amyloid core (termed here as flanking regions) that modulate function, toxicity and/or aggregation rates. These flanking regions, which often form a dynamically disordered “fuzzy coat” around the fibril core, have been shown to play key parts in the physiological roles of functional amyloids, including the binding of RNA and in phase separation. They are also the mediators of chaperone binding and membrane binding/disruption in toxic amyloid assemblies. Here, we review the role of flanking regions in different proteins spanning both functional amyloid and amyloid in disease, in the context of their role in aggregation, toxicity and cellular (dys)function. Understanding the properties of these regions could provide new opportunities to target disease-related aggregation without disturbing critical biological functions.
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Affiliation(s)
- Sabine M Ulamec
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - David J Brockwell
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Sheena E Radford
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
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15
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Pani I, Madhu P, Najiya N, Aayush A, Mukhopadhyay S, Pal SK. Differentiating Conformationally Distinct Alzheimer's Amyloid-β Oligomers Using Liquid Crystals. J Phys Chem Lett 2020; 11:9012-9018. [PMID: 33040538 DOI: 10.1021/acs.jpclett.0c01867] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Soluble oligomers of amyloidogenic proteins like an amyloid-β (Aβ) peptide are believed to exhibit toxic effects in neurodegenerative diseases. The structural classification of oligomers indicates two fundamentally distinct oligomers, namely, fibrillar and prefibrillar oligomers that are recognized by OC and A11 conformation-specific antibodies, respectively. Previous studies have indicated that the interaction of Aβ oligomers with the lipid membrane is one of the mechanisms by which these oligomers exert their toxic effects in Alzheimer's disease. Here, we report that the orientational ordering of liquid crystals (LC) can be used to study the membrane-induced aggregation of Aβ oligomers at nanomolar concentrations. Our results demonstrate a faster fibrillation kinetics of OC-positive fibrillar Aβ oligomers with the lipid monolayer in comparison to that of the A11-positive prefibrillar Aβ oligomers. Our findings suggest a general strategy for distinguishing conformationally distinct soluble oligomers that are formed by a number of amyloidogenic proteins on lipid-decorated aqueous-LC interfaces.
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16
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Kargar F, Emadi S, Fazli H. Dimerization of Aβ40 inside dipalmitoylphosphatidylcholine bilayer and its effect on bilayer integrity: Atomistic simulation at three temperatures. Proteins 2020; 88:1540-1552. [PMID: 32557766 DOI: 10.1002/prot.25972] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 04/28/2020] [Accepted: 06/07/2020] [Indexed: 11/10/2022]
Abstract
Amyloid-beta (Aβ) protein is related to Alzheimer disease (AD), and various experiments have shown that oligomers as small as dimers are cytotoxic. Recent studies have concluded that interactions of Aβ with neuronal cell membranes lead to disruption of membrane integrity and toxicity and they play a key role in the development of AD. Molecular dynamics (MD) simulations have been used to investigate Aβ in aqueous solution and membranes. We have previously studied monomeric Aβ40 embedded in dipalmitoylphosphatidylcholine (DPPC) membrane using MD simulations. Here, we explore interactions of two Aβ40 peptides in DPPC bilayer and its consequences on dimer distribution in a lipid bilayer and on the secondary structure of the peptides. We explored that N-terminals played an important role in dimeric Aβ peptide aggregations and Aβ-bilayer interactions, while C-terminals bound peptides to bilayer like anchors. We did not observe exiting of peptides in our simulations although we observed insertion of peptides into the core of bilayer in some of our simulations. So it seems that the presence of Aβ on membrane surface increases its aggregation rate, and as diffusion occurs in two dimensions, it can increase the probability of interpeptide interactions. We found that dimeric Aβ, like monomeric one, had the ability to cause structural destabilization of DPPC membrane, which in turn might ultimately lead to cell death in an in vivo system. This information could have important implications for understanding the affinity of Aβ oligomers (here dimer) for membranes and the mechanism of Aβ oligomer toxicity in AD.
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Affiliation(s)
- Faezeh Kargar
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
| | - Saeed Emadi
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
| | - Hossein Fazli
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.,Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
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17
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Asiri MMH, Engelsman S, Eijkelkamp N, Höppener JWM. Amyloid Proteins and Peripheral Neuropathy. Cells 2020; 9:E1553. [PMID: 32604774 PMCID: PMC7349787 DOI: 10.3390/cells9061553] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 12/14/2022] Open
Abstract
Painful peripheral neuropathy affects millions of people worldwide. Peripheral neuropathy develops in patients with various diseases, including rare familial or acquired amyloid polyneuropathies, as well as some common diseases, including type 2 diabetes mellitus and several chronic inflammatory diseases. Intriguingly, these diseases share a histopathological feature-deposits of amyloid-forming proteins in tissues. Amyloid-forming proteins may cause tissue dysregulation and damage, including damage to nerves, and may be a common cause of neuropathy in these, and potentially other, diseases. Here, we will discuss how amyloid proteins contribute to peripheral neuropathy by reviewing the current understanding of pathogenic mechanisms in known inherited and acquired (usually rare) amyloid neuropathies. In addition, we will discuss the potential role of amyloid proteins in peripheral neuropathy in some common diseases, which are not (yet) considered as amyloid neuropathies. We conclude that there are many similarities in the molecular and cell biological defects caused by aggregation of the various amyloid proteins in these different diseases and propose a common pathogenic pathway for "peripheral amyloid neuropathies".
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Affiliation(s)
- Mohammed M. H. Asiri
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (M.M.H.A.); (S.E.); (J.W.M.H.)
- The National Centre for Genomic Technology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, 11461 Riyadh, Saudi Arabia
| | - Sjoukje Engelsman
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (M.M.H.A.); (S.E.); (J.W.M.H.)
| | - Niels Eijkelkamp
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (M.M.H.A.); (S.E.); (J.W.M.H.)
| | - Jo W. M. Höppener
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (M.M.H.A.); (S.E.); (J.W.M.H.)
- Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands
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18
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Fibrillization of 40-Residue β-Amyloid Peptides in Membrane-Like Environments Leads to Different Fibril Structures and Reduced Molecular Polymorphisms. Biomolecules 2020; 10:biom10060881. [PMID: 32521743 PMCID: PMC7356566 DOI: 10.3390/biom10060881] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/28/2020] [Accepted: 06/04/2020] [Indexed: 12/31/2022] Open
Abstract
The molecular-level polymorphism in β-Amyloid (Aβ) fibrils have recently been considered as a pathologically relevant factor in Alzheimer’s disease (AD). Studies showed that the structural deviations in human-brain-seeded Aβ fibrils potentially correlated with the clinical histories of AD patients. For the 40-residue Aβ (Aβ40) fibrils derived from human brain tissues, a predominant molecular structure was proposed based on solid-state nuclear magnetic resonance (ssNMR) spectroscopy. However, previous studies have shown that the molecular structures of Aβ40 fibrils were sensitive to their growth conditions in aqueous environments. We show in this work that biological membranes and their phospholipid bilayer mimics serve as environmental factors to reduce the structural heterogeneity in Aβ40 fibrils. Fibrillization in the presence of membranes leads to fibril structures that are significantly different to the Aβ40 fibrils grown in aqueous solutions. Fibrils grown from multiple types of membranes, including the biological membranes extracted from the rats’ synaptosomes, shared similar ssNMR spectral features. Our studies emphasize the biological relevance of membranes in Aβ40 fibril structures and fibrillization processes.
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19
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Strazdaite S, Navakauskas E, Kirschner J, Sneideris T, Niaura G. Structure Determination of Hen Egg-White Lysozyme Aggregates Adsorbed to Lipid/Water and Air/Water Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4766-4775. [PMID: 32251594 DOI: 10.1021/acs.langmuir.9b03826] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We use vibrational sum-frequency generation (VSFG) spectroscopy to study the structure of hen egg-white lysozyme (HEWL) aggregates adsorbed to DOPG/D2O and air/D2O interfaces. We find that aggregates with a parallel and antiparallel β-sheet structure together with smaller unordered aggregates and a denaturated protein are adsorbed to both interfaces. We demonstrate that to retrieve this information, fitting of the VSFG spectra is essential. The number of bands contributing to the VSFG spectrum might be misinterpreted, due to interference between peaks with opposite orientation and a nonresonant background. Our study identified hydrophobicity as the main driving force for adsorption to the air/D2O interface. Adsorption to the DOPG/D2O interface is also influenced by hydrophobic interaction; however, electrostatic interaction between the charged protein's groups and the lipid's headgroups has the most significant effect on the adsorption. We find that the intensity of the VSFG spectrum at the DOPG/D2O interface is strongly enhanced by varying the pH of the solution. We show that this change is not due to a change of lysozyme's and its aggregates' charge but due to dipole reorientation at the DOPG/D2O interface. This finding suggests that extra care must be taken when interpreting the VSFG spectrum of proteins adsorbed at the lipid/water interface.
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Affiliation(s)
- S Strazdaite
- Department of Organic Chemistry, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius LT-10257, Lithuania
| | - E Navakauskas
- Department of Organic Chemistry, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius LT-10257, Lithuania
| | - J Kirschner
- Institute of Solid State Physics, Vienna Technical University, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
| | - T Sneideris
- Institute of Biotechnology, Life Sciences Center, Vilnius University, Sauletekio 7, LT-10257 Vilnius, Lithuania
| | - G Niaura
- Department of Organic Chemistry, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius LT-10257, Lithuania
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20
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Fatafta H, Poojari C, Sayyed-Ahmad A, Strodel B, Owen MC. Role of Oxidized Gly25, Gly29, and Gly33 Residues on the Interactions of Aβ 1-42 with Lipid Membranes. ACS Chem Neurosci 2020; 11:535-548. [PMID: 31939658 DOI: 10.1021/acschemneuro.9b00558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Oxidative stress is known to play an important role in the pathogenesis of Alzheimer's disease. Moreover, it is becoming increasingly evident that the plasma membrane of neurons plays a role in modulating the aggregation and toxicity of Alzheimer's amyloid-β peptide (Aβ). In this study, the combined and interdependent effects of oxidation and membrane interactions on the 42 residues long Aβ isoform are investigated using molecular simulations. Hamiltonian replica exchange molecular dynamics simulations are utilized to elucidate the impact of selected oxidized glycine residues of Aβ42 on the interactions of the peptide with a model membrane comprised of 70% POPC, 25% cholesterol, and 5% of the ganglioside GM1. The main findings are that, independent of the oxidation state, Aβ prefers binding to GM1 over POPC, which is further enhanced by the oxidation of Gly29 and Gly33 and reduced the formation of β-sheet. Our results suggest that the differences observed in Aβ42 conformations and its interaction with a lipid bilayer upon oxidation originate from the position of the oxidized Gly residue with respect to the hydrophobic sequence of Aβ42 involving the Gly29-XXX-Gly33-XXX-Gly37 motif and from specific interactions between the peptide and the terminal sugar groups of GM1.
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Affiliation(s)
- Hebah Fatafta
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Chetan Poojari
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
- Theoretical Physics and Center for Biophysics, Saarland University, Campus E2 6, 66123 Saarbrücken, Germany
| | | | - Birgit Strodel
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry), Forschungszentrum Jülich, 52425 Jülich, Germany
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Michael C. Owen
- CEITEC − Central European Institute of Technology, Masaryk University, Kamenice 753/5, Brno 625 00, Czech Republic
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21
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Sanderson JM. Far from Inert: Membrane Lipids Possess Intrinsic Reactivity That Has Consequences for Cell Biology. Bioessays 2020; 42:e1900147. [PMID: 31995246 DOI: 10.1002/bies.201900147] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/06/2019] [Indexed: 12/19/2022]
Abstract
In this article, it is hypothesized that a fundamental chemical reactivity exists between some non-lipid constituents of cellular membranes and ester-based lipids, the significance of which is not generally recognized. Many peptides and smaller organic molecules have now been shown to undergo lipidation reactions in model membranes in circumstances where direct reaction with the lipid is the only viable route for acyl transfer. Crucially, drugs like propranolol are lipidated in vivo with product profiles that are comparable to those produced in vitro. Some compounds have also been found to promote lipid hydrolysis. Drugs with high lytic activity in vivo tend to have higher toxicity in vitro. Deacylases and lipases are proposed as key enzymes that protect cells against the effects of intrinsic lipidation. The toxic effects of intrinsic lipidation are hypothesized to include a route by which nucleation can occur during the formation of amyloid fibrils.
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22
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Youssef H, DeWolf CE. Interfacial Self-Assembly of Antimicrobial Peptide GL13K into Non-Fibril Crystalline β-Sheets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:660-665. [PMID: 31880463 DOI: 10.1021/acs.langmuir.9b03120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The need for new and potent antibiotics in an era of increasing multidrug resistance in bacteria has driven the search for new antimicrobial agents, including the design of synthetic antimicrobial peptides (AMPs). While a number of β-sheet forming AMPs have been proposed, their similarity to β-amyloids raises a number of concerns associated with neurodegenerative states. GL13K is an effective, synthetic AMP that selectively folds into β-sheets at anionic interfaces. Moreover, it is one of relatively few AMPs that preferentially fold into β-sheets without bridging disulfides. The interfacial activity of GL13K and its propensity to form amyloid fibrils have not been investigated. Using structural studies at the air/water interface and in the absence of anionic lipids, we demonstrate that while GL13K does form crystalline β-sheets, it does not self-assemble into fibrils. This work emphasizes the requirement for a single charged amino acid in the hydrophobic face to prevent fibril formation in synthetic peptides.
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Affiliation(s)
- Hala Youssef
- Department of Chemistry and Biochemistry and Centre for NanoScience Research , Concordia University , 7141 Sherbrooke Street West , Montreal H4B 1R6 , Canada
| | - Christine E DeWolf
- Department of Chemistry and Biochemistry and Centre for NanoScience Research , Concordia University , 7141 Sherbrooke Street West , Montreal H4B 1R6 , Canada
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23
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Study on the structure and membrane disruption of the peptide oligomers constructed by hIAPP 18-27 peptide and its d,l-alternating isomer. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183108. [PMID: 31672548 DOI: 10.1016/j.bbamem.2019.183108] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 09/26/2019] [Accepted: 10/16/2019] [Indexed: 01/14/2023]
Abstract
Increasing lines of evidence show that the oligomeric intermediates of amyloid peptides/proteins are toxic to biological membranes. However, the structural features of the oligomers that are closely associated with the ability to damage biological membranes are far from understanding. In this study, we constructed two species of oligomers using hIAPP18-27 peptide and its d,l-alternating isomer, examined the disruptive ability of the oligomers to POPC/POPG 4:1 vesicles by leakage assay and 31P NMR spectroscopy, and characterized the structural features of the oligomers by CD, TEM, 1H NMR and fluorescence quenching experiments. We found that the d,l-alternating peptide oligomers are more disruptive than the all-L peptide oligomers to the lipid membrane. The characterization of the secondary structure revealed that the d,l-alternating peptide adopts an extended polyproline type-II (PPII) conformation, while the all-L peptide adopts a random coil conformation in oligomers. Compared with the all-L peptide oligomers, the d,l-alternating peptide oligomers are less compact and keep more hydrophobic groups water exposed. Both the changes from PPII to α-sheet in the structure of d,l-alternating peptide and from random coil to β-sheet in the structure of all-L peptide reduce the ability of the peptide oligomers to disrupt the lipid membrane. Our results suggest that an oligomer with extended peptide chains could be more potent in membrane disruption than an oligomer with folded peptide chains and an increase in peptide-peptide interaction could decrease the disruptive ability of oligomer.
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24
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Fabiani C, Antollini SS. Alzheimer's Disease as a Membrane Disorder: Spatial Cross-Talk Among Beta-Amyloid Peptides, Nicotinic Acetylcholine Receptors and Lipid Rafts. Front Cell Neurosci 2019; 13:309. [PMID: 31379503 PMCID: PMC6657435 DOI: 10.3389/fncel.2019.00309] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 06/25/2019] [Indexed: 12/17/2022] Open
Abstract
Biological membranes show lateral and transverse asymmetric lipid distribution. Cholesterol (Chol) localizes in both hemilayers, but in the external one it is mostly condensed in lipid-ordered microdomains (raft domains), together with saturated phosphatidyl lipids and sphingolipids (including sphingomyelin and glycosphingolipids). Membrane asymmetries induce special membrane biophysical properties and behave as signals for several physiological and/or pathological processes. Alzheimer’s disease (AD) is associated with a perturbation in different membrane properties. Amyloid-β (Aβ) plaques and neurofibrillary tangles of tau protein together with neuroinflammation and neurodegeneration are the most characteristic cellular changes observed in this disease. The extracellular presence of Aβ peptides forming senile plaques, together with soluble oligomeric species of Aβ, are considered the major cause of the synaptic dysfunction of AD. The association between Aβ peptide and membrane lipids has been extensively studied. It has been postulated that Chol content and Chol distribution condition Aβ production and posterior accumulation in membranes and, hence, cell dysfunction. Several lines of evidence suggest that Aβ partitions in the cell membrane accumulate mostly in raft domains, the site where the cleavage of the precursor AβPP by β- and γ- secretase is also thought to occur. The main consequence of the pathogenesis of AD is the disruption of the cholinergic pathways in the cerebral cortex and in the basal forebrain. In parallel, the nicotinic acetylcholine receptor has been extensively linked to membrane properties. Since its transmembrane domain exhibits extensive contacts with the surrounding lipids, the acetylcholine receptor function is conditioned by its lipid microenvironment. The nicotinic acetylcholine receptor is present in high-density clusters in the cell membrane where it localizes mainly in lipid-ordered domains. Perturbations of sphingomyelin or cholesterol composition alter acetylcholine receptor location. Therefore, Aβ processing, Aβ partitioning, and acetylcholine receptor location and function can be manipulated by changes in membrane lipid biophysics. Understanding these mechanisms should provide insights into new therapeutic strategies for prevention and/or treatment of AD. Here, we discuss the implications of lipid-protein interactions at the cell membrane level in AD.
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Affiliation(s)
- Camila Fabiani
- Instituto de Investigaciones Bioquímicas de Bahía Blanca CONICET-UNS, Bahía Blanca, Argentina.,Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina
| | - Silvia S Antollini
- Instituto de Investigaciones Bioquímicas de Bahía Blanca CONICET-UNS, Bahía Blanca, Argentina.,Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina
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25
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Oh MI, Gupta M, Weaver DF. Understanding Water Structure in an Ion-Pair Solvation Shell in the Vicinity of a Water/Membrane Interface. J Phys Chem B 2019; 123:3945-3954. [DOI: 10.1021/acs.jpcb.9b01331] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Myong In Oh
- Krembil Research Institute, University Health Network, Toronto, Ontario M5T 0S8, Canada
| | - Mayuri Gupta
- Krembil Research Institute, University Health Network, Toronto, Ontario M5T 0S8, Canada
| | - Donald F. Weaver
- Krembil Research Institute, University Health Network, Toronto, Ontario M5T 0S8, Canada
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
- Department of Medicine, University of Toronto, Toronto, Ontario M5G 2C4, Canada
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
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26
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Ismael MA, Khan JM, Malik A, Alsenaidy MA, Hidayathulla S, Khan RH, Sen P, Irfan M, Alsenaidy AM. Unraveling the molecular mechanism of the effects of sodium dodecyl sulfate, salts, and sugars on amyloid fibril formation in camel IgG. Colloids Surf B Biointerfaces 2018; 170:430-437. [DOI: 10.1016/j.colsurfb.2018.06.035] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 05/14/2018] [Accepted: 06/17/2018] [Indexed: 10/28/2022]
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27
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Cheng Q, Hu ZW, Doherty KE, Tobin-Miyaji YJ, Qiang W. The on-fibrillation-pathway membrane content leakage and off-fibrillation-pathway lipid mixing induced by 40-residue β-amyloid peptides in biologically relevant model liposomes. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2018; 1860:1670-1680. [PMID: 29548698 PMCID: PMC6295276 DOI: 10.1016/j.bbamem.2018.03.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 03/08/2018] [Accepted: 03/10/2018] [Indexed: 02/06/2023]
Abstract
Disruption of the synaptic plasma membrane (SPM) induced by the aggregation of β-amyloid (Aβ) peptides has been considered as a potential mechanism for the neurotoxicity of Aβ in Alzheimer's disease (AD). However, the molecular basis of such membrane disruption process remains unclear, mainly because of the severe systematic heterogeneity problem that prevents the high-resolution studies. Our previous studies using a two-component phosphatidylcholine (PC)/phosphatidylglycerol (PG) model liposome showed the presence of Aβ-induced membrane disruptions that were either on the pathway or off the pathway of fibril formation. The present study focuses on a more biologically relevant model membrane with compositions that mimic the outer leaflet of SPMs. The main findings are: (1) the two competing membrane disruption effects discovered in PC/PG liposomes and their general peptide-to-lipid-molar-ratio dependence persist in the more complicated membrane models; (2) the SPM-mimic membrane promotes the formation of certain "on-fibrillation-pathway" intermediates with higher α-helical structural population, which lead to more rapid and significant of membrane content leakage; (3) although the "on-fibrillation-pathway" intermediate structures show dependence on membrane compositions, there seems to be a common final fibril structure grown from different liposomes, suggesting that there may be a predominant fibril structure for 40-residue Aβ (i.e. Aβ40) peptides in biologically-relevant membranes. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.
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Affiliation(s)
- Qinghui Cheng
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, United States
| | - Zhi-Wen Hu
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, United States
| | - Katelynne E Doherty
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, United States
| | - Yuto J Tobin-Miyaji
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, United States
| | - Wei Qiang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, United States.
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28
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Insulin–eukaryotic model membrane interaction: Mechanistic insight of insulin fibrillation and membrane disruption. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1917-1926. [DOI: 10.1016/j.bbamem.2018.02.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/05/2018] [Accepted: 02/05/2018] [Indexed: 12/26/2022]
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29
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Niu Z, Zhang Z, Zhao W, Yang J. Interactions between amyloid β peptide and lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1663-1669. [PMID: 29679539 DOI: 10.1016/j.bbamem.2018.04.004] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 04/12/2018] [Accepted: 04/12/2018] [Indexed: 10/17/2022]
Abstract
The presence of amyloid plaques in the brain is a typical characteristic of Alzheimer's disease (AD). Amyloid plaques are formed from the deposits of aggregated amyloid β peptide (Aβ). The toxicity induced by Aβ aggregates is correlated with Aβ-membrane interactions. The mutual influences between aggregation and membranes are complicated and unclear. In recent years advanced experiments and findings are emerging to give us more detailed information on Aβ-membrane interactions. In this review, we mainly focus on the Aβ-membrane interactions and membrane-induced Aβ structures. The mechanism of Aβ-membrane interactions is also summarized, which provides insights into the prevention and treatment of AD.
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Affiliation(s)
- Zheng Niu
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071 Wuhan, PR China
| | - Zhengfeng Zhang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071 Wuhan, PR China
| | - Weijing Zhao
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071 Wuhan, PR China
| | - Jun Yang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071 Wuhan, PR China.
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30
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Peretz Y, Malishev R, Kolusheva S, Jelinek R. Nanoparticles modulate membrane interactions of human Islet amyloid polypeptide (hIAPP). BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1810-1817. [PMID: 29641979 DOI: 10.1016/j.bbamem.2018.03.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/27/2018] [Accepted: 03/29/2018] [Indexed: 01/26/2023]
Abstract
The dramatic expansion of nanotechnology applications, particularly the advent of nanomaterials and nanoparticles (NPs) into the consumer economy, have led to heightened awareness of their potential health risks. This study examines the impact of several NPs upon membrane-induced aggregation and bilayer interactions of the human Islet amyloid polypeptide (hIAPP). We report that several NPs - polymeric NPs, TiO2 NPs, and Au NPs displaying coating layers exhibiting different electrostatic charges - did not significantly interfere with the fibrillation process and fibril morphology of hIAPP, both in buffer or in biomimetic DMPC:DMPG vesicle solutions. Spectroscopic and microscopic analyses suggest, in fact, that the NPs promoted membrane-induced fibrillation. Importantly, we find that all the NPs examined, regardless of composition or surface properties, gave rise to more pronounced, synergistic bilayer interactions when co-incubated with hIAPP. NP-enhanced bilayer interactions of hIAPP might point to possible toxicity and pathogenicity risks of amyloidogenic peptides in the presence of NPs.
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Affiliation(s)
- Yossef Peretz
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Ravit Malishev
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Raz Jelinek
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel; Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
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31
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Owen MC, Kulig W, Poojari C, Rog T, Strodel B. Physiologically-relevant levels of sphingomyelin, but not GM1, induces a β-sheet-rich structure in the amyloid-β(1-42) monomer. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1709-1720. [PMID: 29626441 DOI: 10.1016/j.bbamem.2018.03.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/29/2018] [Accepted: 03/31/2018] [Indexed: 01/07/2023]
Abstract
To resolve the contribution of ceramide-containing lipids to the aggregation of the amyloid-β protein into β-sheet rich toxic oligomers, we employed molecular dynamics simulations to study the effect of cholesterol-containing bilayers comprised of POPC (70% POPC, and 30% cholesterol) and physiologically relevant concentrations of sphingomyelin (SM) (30% SM, 40% POPC, and 30% cholesterol), and the GM1 ganglioside (5% GM1, 70% POPC, and 25% cholesterol). The increased bilayer rigidity provided by SM (and to a lesser degree, GM1) reduced the interactions between the SM-enriched bilayer and the N-terminus of Aβ42 (and also residues Ser26, Asn27, and Lys28), which facilitated the formation of a β-sheet in the normally disordered N-terminal region. Aβ42 remained anchored to the SM-enriched bilayer through hydrogen bonds with the side chain of Arg5. With β-sheets in the at the N and C termini, the structure of Aβ42 in the sphingomyelin-enriched bilayer most resembles β-sheet-rich structures found in higher-ordered Aβ fibrils. Conversely, when bound to a bilayer comprised of 5% GM1, the conformation remained similar to that observed in the absence of GM1, with Aβ42 only making contact with one or two GM1 molecules. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.
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Affiliation(s)
- Michael C Owen
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany; CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 753/5, Brno 625 00, Czech Republic.
| | - Waldemar Kulig
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland
| | - Chetan Poojari
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland
| | - Tomasz Rog
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland; Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany; Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.
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32
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Abstract
Solid-state nuclear magnetic resonance (SSNMR) spectroscopy elucidates membrane protein structures and dynamics in atomic detail to yield mechanistic insights. By interrogating membrane proteins in phospholipid bilayers that closely resemble biological membranes, SSNMR spectroscopists have revealed ion conduction mechanisms, substrate transport dynamics, and oligomeric interfaces of seven-transmembrane helix proteins. Research has also identified conformational plasticity underlying virus-cell membrane fusions by complex protein machineries, and β-sheet folding and assembly by amyloidogenic proteins bound to lipid membranes. These studies collectively show that membrane proteins exhibit extensive structural plasticity to carry out their functions. Because of the inherent dependence of NMR frequencies on molecular orientations and the sensitivity of NMR frequencies to dynamical processes on timescales from nanoseconds to seconds, SSNMR spectroscopy is ideally suited to elucidate such structural plasticity, local and global conformational dynamics, protein-lipid and protein-ligand interactions, and protonation states of polar residues. New sensitivity-enhancement techniques, resolution enhancement by ultrahigh magnetic fields, and the advent of 3D and 4D correlation NMR techniques are increasingly aiding these mechanistically important structural studies.
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Affiliation(s)
- Venkata S Mandala
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
| | - Jonathan K Williams
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
| | - Mei Hong
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
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33
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Borro BC, Parolini L, Cicuta P, Foderà V, Di Michele L. Interaction with prefibrillar species and amyloid-like fibrils changes the stiffness of lipid bilayers. Phys Chem Chem Phys 2018; 19:27930-27934. [PMID: 29028061 DOI: 10.1039/c7cp05339h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Evaluating the toxicity of self-assembled protein states is a key step towards developing effective strategies against amyloidogenic pathologies such as Alzheimer's and Parkinson's diseases. Such analysis is directly connected to quantitatively probing the stability of the cellular membrane upon interaction with different protein states. Using a combination of spectroscopic techniques, morphological observations, and spectral analysis of membrane fluctuations, we identify different destabilisation routes for giant unilamellar vesicles interacting with native-like states, prefibrillar species and amyloid-like fibrils of α-lactalbumin. These effects range from substantially lowering the bending rigidity of the membranes to irreversible structural changes and complete disruption of the lipid bilayers. Our findings clearly indicate how the wide heterogeneity in structures occurring during protein aggregation can result in different destabilisation pathways, acting on different length scales and not limited to enhanced membrane permeability.
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Affiliation(s)
- Bruno C Borro
- Section for Biologics, Dept. of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark.
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34
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Jamasbi E, Hossain MA, Tan M, Separovic F, Ciccotosto GD. Fluorescence imaging of the interaction of amyloid beta 40 peptides with live cells and model membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1609-1615. [PMID: 29408451 DOI: 10.1016/j.bbamem.2018.01.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/23/2018] [Accepted: 01/27/2018] [Indexed: 11/30/2022]
Abstract
Amyloid beta peptides (Aβ) found in plaques in the brain have been widely recognised as a hallmark of Alzheimer's disease although the underlying mechanism is still unknown. Aβ40 and Aβ40(A2T) peptides were synthesized and their effects on neuronal cells are reported together with the effect of tetramer forms of the peptides. ThT assay revealed that mutation affected the lag time and aggregation and the presence of lipid vesicles changed the fibril formation profile for both peptides. The A2T mutation appeared to reduce cytotoxicity and lessen binding of Aβ40 peptides to neuronal cells. Fluorescence microscopy of the interaction between Aβ40 peptides and giant unilamellar vesicles revealed that both peptides led to formation of smaller vesicles although the tetramer of Aβ(A2T) appeared to promote vesicle aggregation. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.
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Affiliation(s)
- Elaheh Jamasbi
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia
| | - Mohammed Akhter Hossain
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia; The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, VIC 3010, Australia
| | - Marsha Tan
- Department of Pathology, The University of Melbourne, VIC 3010, Australia
| | - Frances Separovic
- School of Chemistry, Bio21 Institute, The University of Melbourne, VIC 3010, Australia.
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35
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Qiang W, Doherty KE. Model Phospholipid Liposomes to Study the β-Amyloid-Peptide-Induced Membrane Disruption. Methods Mol Biol 2018; 1777:355-367. [PMID: 29744848 PMCID: PMC6298028 DOI: 10.1007/978-1-4939-7811-3_23] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
Model phospholipid liposomes have been utilized widely to study the molecular interactions between peptides and membrane bilayers. In the mechanistic study of Alzheimer's disease (AD), disruption of neuronal cell membranes has been considered as a major contribution for the β-amyloid (Aβ) peptides' neurotoxicity. However, clear interpretation of the Aβ-induced cellular membrane at high-resolution level is challenging because of the co-existence of multiple pathways. Here we present the generation of simplified model liposome systems that will facilitate the in-depth mechanistic studies. Protocols for the preparation of model liposomes and the characterization of individual membrane disruption effects will be described.
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Affiliation(s)
- Wei Qiang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, USA.
| | - Katelynne E Doherty
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY, USA
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36
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van der Wel PCA. Insights into protein misfolding and aggregation enabled by solid-state NMR spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 88:1-14. [PMID: 29035839 PMCID: PMC5705391 DOI: 10.1016/j.ssnmr.2017.10.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 10/03/2017] [Accepted: 10/03/2017] [Indexed: 05/17/2023]
Abstract
The aggregation of proteins and peptides into a variety of insoluble, and often non-native, aggregated states plays a central role in many devastating diseases. Analogous processes undermine the efficacy of polypeptide-based biological pharmaceuticals, but are also being leveraged in the design of biologically inspired self-assembling materials. This Trends article surveys the essential contributions made by recent solid-state NMR (ssNMR) studies to our understanding of the structural features of polypeptide aggregates, and how such findings are informing our thinking about the molecular mechanisms of misfolding and aggregation. A central focus is on disease-related amyloid fibrils and oligomers involved in neurodegenerative diseases such as Alzheimer's, Parkinson's and Huntington's disease. SSNMR-enabled structural and dynamics-based findings are surveyed, along with a number of resulting emerging themes that appear common to different amyloidogenic proteins, such as their compact alternating short-β-strand/β-arc amyloid core architecture. Concepts, methods, future prospects and challenges are discussed.
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Affiliation(s)
- Patrick C A van der Wel
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, USA.
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37
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Nanoelectrical characterization of amyloid-β42 aggregates via Kelvin probe force microscopy. Macromol Res 2017. [DOI: 10.1007/s13233-017-5155-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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38
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Cheng Q, Qiang W. Solid-State-NMR-Structure-Based Inhibitor Design to Achieve Selective Inhibition of the Parallel-in-Register β-Sheet versus Antiparallel Iowa Mutant β-Amyloid Fibrils. J Phys Chem B 2017; 121:5544-5552. [DOI: 10.1021/acs.jpcb.7b02953] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Qinghui Cheng
- Department of Chemistry, The State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Wei Qiang
- Department of Chemistry, The State University of New York at Binghamton, Binghamton, New York 13902, United States
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39
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Kargar F, Emadi S, Fazli H. The molecular behavior of a single β-amyloid inside a dipalmitoylphosphatidylcholine bilayer at three different temperatures: An atomistic simulation study: Aβ interaction with DPPC: Atomistic simulation. Proteins 2017; 85:1298-1310. [PMID: 28342211 DOI: 10.1002/prot.25290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 03/16/2017] [Accepted: 03/21/2017] [Indexed: 01/29/2023]
Abstract
The behavior of a single Aβ40 molecule within a dipalmitoylphosphatidylcholine (DPPC) bilayer was studied by all-atom molecular dynamics simulations. The effect of membrane structure was investigated on Aβ40 behavior, secondary structure, and insertion depth. Simulations were performed at three temperatures (323, 310, and 300 K) to probe three different bilayer fluidities. Results show that at all above temperatures, the peptide contains two short helices, coil, bend, and turn structures. At 300 K, the peptide contains a region with β structure in C-terminal region. Our results also show that Aβ decreases the bilayer thickness and the order of lipids in its vicinity which leads to water insertion into the bilayer and concomitant increase in the local fluidity. The peptide remains embedded in the bilayer at all temperatures, and become inserted into the bilayer up to several residues at 323 and 310 K. At 310 and 300 K, the dominant interaction energy between Aβ and bilayer changes from electrostatic to van der Waals. It can be proposed that at higher temperatures (e.g., 323 K), Lys28 and the C-terminal region of the peptide play the role of two anchors that keep Aβ inside the top leaflet. This study demonstrates that Aβ molecule can perturb the integrity of cellular membranes. Proteins 2017; 85:1298-1310. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Faezeh Kargar
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
| | - Saeed Emadi
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
| | - Hossein Fazli
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.,Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
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40
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Sivaprakasam C, Vijayakumar R, Arul M, Nachiappan V. Alteration of mitochondrial phospholipid due to the PLA 2 activation in rat brains under cadmium toxicity. Toxicol Res (Camb) 2016; 5:1680-1687. [PMID: 30090467 PMCID: PMC6062122 DOI: 10.1039/c6tx00201c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 09/12/2016] [Indexed: 12/21/2022] Open
Abstract
Cadmium (Cd) is a heavy metal that has received considerable environmental and occupational concern. Cd causes toxic effects due to its accumulation in a variety of tissues, including the kidney, liver and the nervous system (CNS); however, the exact mechanism is poorly understood. In the present study, we tried to explore the impact of acute cadmium exposure on rat brain phospholipids (PLs). Cd exposure significantly reduced PLs in a time dependent manner and the reduction was due to the activation of the Phospholipase A2 enzymes (sPLA2, cPLA2). The release of arachidonic acid from PLs increased during inflammatory conditions by PLA2s. The mRNA expression of cyclooxygenase2 (COX2) and subsequently the pro-inflammatory cytokines, namely, Interleukin 1 (IL-1) and IL-6, were up regulated; however, the expression of anti-inflammatory cytokine IL-10 was reduced in a time dependent manner. The expression of the Tumor necrosis factor alpha (TNF-α), Inducible nitric oxide synthase (iNOS) and Interferon gamma (INF-γ) also experienced increases in the expression. Likewise the mRNA expression of the pro-apoptotic factor, Bcl-2-associated X protein (Bax), was elevated, whereas anti-apoptosis B-cell lymphoma 2 (Bcl2) was down regulated. This present study might help to decipher the effects of cadmium toxicity on rat brain.
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Affiliation(s)
- Chinnarasu Sivaprakasam
- Biomembrane Lab , Department of Biochemistry , School of Life sciences , Bharathidasan University , Tiruchirappalli , Tamilnadu 24 , India . ; ; Tel: +91-431-2904866
| | - Rajendran Vijayakumar
- Biomembrane Lab , Department of Biochemistry , School of Life sciences , Bharathidasan University , Tiruchirappalli , Tamilnadu 24 , India . ; ; Tel: +91-431-2904866
| | - Mathivanan Arul
- Biomembrane Lab , Department of Biochemistry , School of Life sciences , Bharathidasan University , Tiruchirappalli , Tamilnadu 24 , India . ; ; Tel: +91-431-2904866
| | - Vasanthi Nachiappan
- Biomembrane Lab , Department of Biochemistry , School of Life sciences , Bharathidasan University , Tiruchirappalli , Tamilnadu 24 , India . ; ; Tel: +91-431-2904866
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41
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Phosphatidylcholine protects neurons from toxic effects of amyloid β-protein in culture. Brain Res 2016; 1642:376-383. [DOI: 10.1016/j.brainres.2016.04.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 04/11/2016] [Accepted: 04/13/2016] [Indexed: 12/14/2022]
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42
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Delgado DA, Doherty K, Cheng Q, Kim H, Xu D, Dong H, Grewer C, Qiang W. Distinct Membrane Disruption Pathways Are Induced by 40-Residue β-Amyloid Peptides. J Biol Chem 2016; 291:12233-44. [PMID: 27056326 DOI: 10.1074/jbc.m116.720656] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 11/06/2022] Open
Abstract
Cellular membrane disruption induced by β-amyloid (Aβ) peptides has been considered one of the major pathological mechanisms for Alzheimer disease. Mechanistic studies of the membrane disruption process at a high-resolution level, on the other hand, are hindered by the co-existence of multiple possible pathways, even in simplified model systems such as the phospholipid liposome. Therefore, separation of these pathways is crucial to achieve an in-depth understanding of the Aβ-induced membrane disruption process. This study, which utilized a combination of multiple biophysical techniques, shows that the peptide-to-lipid (P:L) molar ratio is an important factor that regulates the selection of dominant membrane disruption pathways in the presence of 40-residue Aβ peptides in liposomes. Three distinct pathways (fibrillation with membrane content leakage, vesicle fusion, and lipid uptake through a temporarily stable ionic channel) become dominant in model liposome systems under specific conditions. These individual systems are characterized by both the initial states of Aβ peptides and the P:L molar ratio. Our results demonstrated the possibility to generate simplified Aβ-membrane model systems with a homogeneous membrane disruption pathway, which will benefit high-resolution mechanistic studies in the future. Fundamentally, the possibility of pathway selection controlled by P:L suggests that the driving forces for Aβ aggregation and Aβ-membrane interactions may be similar at the molecular level.
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Affiliation(s)
- Dennis A Delgado
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
| | - Katelynne Doherty
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
| | - Qinghui Cheng
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
| | - Hyeongeun Kim
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
| | - Dawei Xu
- the Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699
| | - He Dong
- the Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699
| | - Christof Grewer
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
| | - Wei Qiang
- From the Department of Chemistry, State University of New York, Binghamton, New York 13902 and
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43
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Emendato A, Spadaccini R, De Santis A, Guerrini R, D'Errico G, Picone D. Preferential interaction of the Alzheimer peptide Aβ-(1-42) with Omega-3-containing lipid bilayers: structure and interaction studies. FEBS Lett 2016; 590:582-91. [PMID: 26821608 DOI: 10.1002/1873-3468.12082] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/15/2016] [Accepted: 01/21/2016] [Indexed: 01/08/2023]
Abstract
Many age-related neurodegenerative diseases, including Alzheimer Disease (AD), are elicited by an interplay of genetic, environmental, and dietary factors. Food rich in Omega-3 phospholipids seems to reduce the AD incidence. To investigate the molecular basis of this beneficial effect, we have investigated by CD and ESR studies the interaction between the Alzheimer peptide Aβ-(1-42) and biomimetic lipid bilayers. The inclusion of 1,2-didocosahexaenoyl-sn-glycero-3-phosphocholine does not change significantly the bilayers organization, but favors its Aβ-(1-42) interaction. The Omega-3 lipid amount modulates the effect intensity, suggesting a peptide selectivity for membranes containing polyunsatured fatty acids (PUFA) and providing hints for the mechanism and therapy of AD.
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Affiliation(s)
| | - Roberta Spadaccini
- Department of Chemical Sciences, University of Naples Federico II, Italy.,Department of Science and Technologies, University of Sannio, Benevento, Italy
| | - Augusta De Santis
- Department of Chemical Sciences, University of Naples Federico II, Italy.,CSGI, Consorzio interuniversitario per lo sviluppo dei Sistemi a Grande Interfase, Unit of Naples, Italy
| | - Remo Guerrini
- Department of Chemical and Pharmaceutical Sciences and Laboratorio per le tecnologie delle terapie avanzate (LTTA), University of Ferrara, Italy
| | - Gerardino D'Errico
- Department of Chemical Sciences, University of Naples Federico II, Italy.,CSGI, Consorzio interuniversitario per lo sviluppo dei Sistemi a Grande Interfase, Unit of Naples, Italy
| | - Delia Picone
- Department of Chemical Sciences, University of Naples Federico II, Italy
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44
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Bhowmik D, Mote KR, MacLaughlin CM, Biswas N, Chandra B, Basu JK, Walker GC, Madhu PK, Maiti S. Cell-Membrane-Mimicking Lipid-Coated Nanoparticles Confer Raman Enhancement to Membrane Proteins and Reveal Membrane-Attached Amyloid-β Conformation. ACS NANO 2015; 9:9070-7. [PMID: 26391443 DOI: 10.1021/acsnano.5b03175] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Identifying the structures of membrane bound proteins is critical to understanding their function in healthy and diseased states. We introduce a surface enhanced Raman spectroscopy technique which can determine the conformation of membrane-bound proteins, at low micromolar concentrations, and also in the presence of a substantial membrane-free fraction. Unlike conventional surface enhanced Raman spectroscopy, our approach does not require immobilization of molecules, as it uses spontaneous binding of proteins to lipid bilayer-encapsulated Ag nanoparticles. We apply this technique to probe membrane-attached oligomers of Amyloid-β40 (Aβ40), whose conformation is keenly sought in the context of Alzheimer's disease. Isotope-shifts in the Raman spectra help us obtain secondary structure information at the level of individual residues. Our results show the presence of a β-turn, flanked by two β-sheet regions. We use solid-state NMR data to confirm the presence of the β-sheets in these regions. In the membrane-attached oligomer, we find a strongly contrasting and near-orthogonal orientation of the backbone H-bonds compared to what is found in the mature, less-toxic Aβ fibrils. Significantly, this allows a "porin" like β-barrel structure, providing a structural basis for proposed mechanisms of Aβ oligomer toxicity.
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Affiliation(s)
- Debanjan Bhowmik
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - Kaustubh R Mote
- TIFR Centre for Interdisciplinary Sciences , 21 Brundavan Colony, Narsinghi, Hyderabad 500075, India
| | - Christina M MacLaughlin
- Department of Chemistry, Lash Miller Laboratories, University of Toronto , Toronto, ON M5S 3H6, Canada
| | - Nupur Biswas
- Department of Physics, Indian Institute of Science , Bengaluru 560012, India
| | - Bappaditya Chandra
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
| | - Jaydeep K Basu
- Department of Physics, Indian Institute of Science , Bengaluru 560012, India
| | - Gilbert C Walker
- Department of Chemistry, Lash Miller Laboratories, University of Toronto , Toronto, ON M5S 3H6, Canada
| | - Perunthiruthy K Madhu
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
- TIFR Centre for Interdisciplinary Sciences , 21 Brundavan Colony, Narsinghi, Hyderabad 500075, India
| | - Sudipta Maiti
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
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45
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Hubin E, Deroo S, Schierle GK, Kaminski C, Serpell L, Subramaniam V, van Nuland N, Broersen K, Raussens V, Sarroukh R. Two distinct β-sheet structures in Italian-mutant amyloid-beta fibrils: a potential link to different clinical phenotypes. Cell Mol Life Sci 2015; 72:4899-913. [PMID: 26190022 PMCID: PMC4648968 DOI: 10.1007/s00018-015-1983-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 06/06/2015] [Accepted: 07/02/2015] [Indexed: 12/22/2022]
Abstract
Most Alzheimer’s disease (AD) cases are late-onset and characterized by the aggregation and deposition of the amyloid-beta (Aβ) peptide in extracellular plaques in the brain. However, a few rare and hereditary Aβ mutations, such as the Italian Glu22-to-Lys (E22K) mutation, guarantee the development of early-onset familial AD. This type of AD is associated with a younger age at disease onset, increased β-amyloid accumulation, and Aβ deposition in cerebral blood vessel walls, giving rise to cerebral amyloid angiopathy (CAA). It remains largely unknown how the Italian mutation results in the clinical phenotype that is characteristic of CAA. We therefore investigated how this single point mutation may affect the aggregation of Aβ1–42 in vitro and structurally characterized the resulting fibrils using a biophysical approach. This paper reports that wild-type and Italian-mutant Aβ both form fibrils characterized by the cross-β architecture, but with distinct β-sheet organizations, resulting in differences in thioflavin T fluorescence and solvent accessibility. E22K Aβ1–42 oligomers and fibrils both display an antiparallel β-sheet structure, in comparison with the parallel β-sheet structure of wild-type fibrils, characteristic of most amyloid fibrils described in the literature. Moreover, we demonstrate structural plasticity for Italian-mutant Aβ fibrils in a pH-dependent manner, in terms of their underlying β-sheet arrangement. These findings are of interest in the ongoing debate that (1) antiparallel β-sheet structure might represent a signature for toxicity, which could explain the higher toxicity reported for the Italian mutant, and that (2) fibril polymorphism might underlie differences in disease pathology and clinical manifestation.
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Affiliation(s)
- Ellen Hubin
- Nanobiophysics Group, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands.,Structural Biology Brussels, Department of Biotechnology (DBIT), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium.,Structural Biology Research Center, VIB, Pleinlaan 2, 1050, Brussels, Belgium
| | - Stéphanie Deroo
- Laboratory of Structure and Function of Biological Membrane, Faculté des Sciences, Center for Structural Biology and Bioinformatics, Université Libre de Bruxelles (ULB), Campus de la Plaine CP 206/02, Boulevard du Triomphe, 1050, Brussels, Belgium
| | - Gabriele Kaminksi Schierle
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3RA, UK
| | - Clemens Kaminski
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3RA, UK
| | - Louise Serpell
- School of Life Sciences, University of Sussex, Falmer, East Sussex, BN1 9QG, UK
| | - Vinod Subramaniam
- Nanobiophysics Group, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands.,FOM Institute AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands
| | - Nico van Nuland
- Structural Biology Brussels, Department of Biotechnology (DBIT), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium.,Structural Biology Research Center, VIB, Pleinlaan 2, 1050, Brussels, Belgium
| | - Kerensa Broersen
- Nanobiophysics Group, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE, Enschede, The Netherlands.
| | - Vincent Raussens
- Laboratory of Structure and Function of Biological Membrane, Faculté des Sciences, Center for Structural Biology and Bioinformatics, Université Libre de Bruxelles (ULB), Campus de la Plaine CP 206/02, Boulevard du Triomphe, 1050, Brussels, Belgium
| | - Rabia Sarroukh
- Laboratory of Structure and Function of Biological Membrane, Faculté des Sciences, Center for Structural Biology and Bioinformatics, Université Libre de Bruxelles (ULB), Campus de la Plaine CP 206/02, Boulevard du Triomphe, 1050, Brussels, Belgium.
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Akinlolu RD, Nam M, Qiang W. Competition between Fibrillation and Induction of Vesicle Fusion for the Membrane-Associated 40-Residue β-Amyloid Peptides. Biochemistry 2015; 54:3416-9. [PMID: 25988500 DOI: 10.1021/acs.biochem.5b00321] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Disruption of the cell membrane by the β-amyloid (Aβ) peptides has been considered as a main mechanism of Alzheimer's disease. The peptide-to-lipid molar ratio (P:L) varies over a broad range biologically. We report here that two of the previously observed Aβ evolution pathways, fibrillation and induction of vesicle fusion, compete with each other when P:L varies in model Aβ-liposome systems. Fibrillation is preferred at higher P:L values, and fusion is promoted at lower P:L values. Structural studies suggest that the same residues in Aβ may involve in both the initial fibrillation and membrane binding at the fusion sites.
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Affiliation(s)
- Rumonat D Akinlolu
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Mimi Nam
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Wei Qiang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
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