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Kamburova K, Dimitrov IL, Hodzhaoglu F, Milkova V. Investigation of the Aggregation of Aβ Peptide (1-40) in the Presence of κ-Carrageenan-Stabilised Liposomes Loaded with Homotaurine. Molecules 2024; 29:3460. [PMID: 39124866 PMCID: PMC11313970 DOI: 10.3390/molecules29153460] [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: 07/07/2024] [Revised: 07/21/2024] [Accepted: 07/22/2024] [Indexed: 08/12/2024] Open
Abstract
The kinetics of amyloid aggregation was studied indirectly by monitoring the changes in the polydispersity of mixed dispersion of amyloid β peptide (1-40) and composite liposomes. The liposomes were prepared from the 1,2-dioleoyl-sn-glicero-3-phoshocholine (DOPC) phospholipid and stabilised by the electrostatic adsorption of κ-carrageenan. The produced homotaurine-loaded and unloaded liposomes had a highly negative electrokinetic potential and remarkable stability in phosphate buffer (pH 4 and 7.4). For the first time, the appearance and evolution of the aggregation of Aβ were presented through the variation in the standard percentile readings (D10, D50, and D90) obtained from the particle size distribution analysis. The kinetic experiments indicated the appearance of the first aggregates almost 30 min after mixing the liposomes and peptide solution. It was observed that by adding unloaded liposomes, the size of 90% of the particles in the dispersion (D90) increased. In contrast, the addition of homotaurine-loaded liposomes had almost minimal impact on the size of the fractions of larger particles during the kinetic experiments. Despite the specific bioactivity of homotaurine in the presence of natural cell membranes, this study reported an additional inhibitory effect of the compound on the amyloid peptide aggregation due to the charge effects and 'molecular crowding'.
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Affiliation(s)
| | | | | | - Viktoria Milkova
- Institute of Physical Chemistry ‘Acad. R. Kaischew’, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (K.K.); (I.L.D.); (F.H.)
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2
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Panghal A, Flora SJS. Nanotechnology in the diagnostic and therapy for Alzheimer's disease. Biochim Biophys Acta Gen Subj 2024; 1868:130559. [PMID: 38191034 DOI: 10.1016/j.bbagen.2024.130559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/21/2023] [Accepted: 01/04/2024] [Indexed: 01/10/2024]
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder primarily characterized by β-amyloid plaque, intraneuronal tangles, significant neuronal loss and cognitive deficit. Treatment in the early stages of the disease is crucial for preventing or perhaps reversing the neurodegeneration in the AD cases. However, none of the current diagnostic procedures are capable of early diagnosis of AD. Further, the available treatments merely provide symptomatic alleviation in AD and do not address the underlying illness. Therefore, there is no permanent cure for AD currently. Better therapeutic outcomes need the optimum drug concentration in the central nervous system (CNS) by traversing blood-brain-barrier (BBB). Nanotechnology offers enormous promise to transform the treatment and diagnostics of neurodegenerative diseases. Nanotechnology based diagnostic tools, drug delivery systems and theragnostic are capable of highly sensitive molecular detection, effective drug targeting and their combination. Significant work has been done in this area over the last decade and prospective results have been obtained in AD therapy. This review explores the various applications of nanotechnology in addressing the varied facets of AD, ranging from early detection to therapeutic interventions. This review also looks at how nanotechnology can help with the development of disease-modifying medicines, such as the delivery of anti-amyloid, anti-tau, cholinesterase inhibitors, antioxidants and hormonal drugs. In conclusion, this paper discusses the role of nanotechnology in the early detection of AD, effective drug targeting to the CNS and theragnostic applications in the management of AD.
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Affiliation(s)
- Archna Panghal
- National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, Panjab 160012, India
| | - S J S Flora
- National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali, Panjab 160012, India; Institute of Pharmaceutical Sciences, Era Medical University, Safarajganj, Lucknow 226003, U.P., India.
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3
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Ohnuma K, Yamashita A, Yasui N. Investigating the Effect of Substituting a Single Cysteine Residue on the Thermal Stability of an Engineered Sweet Protein, Single-Chain Monellin. Protein J 2023; 42:698-708. [PMID: 37737932 PMCID: PMC10590300 DOI: 10.1007/s10930-023-10154-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2023] [Indexed: 09/23/2023]
Abstract
Single-chain monellin (SCM) is an engineered protein that links the two chains of monellin, a naturally sweet-tasting protein. This protein is an attractive candidate for use as a sugar replacement in food and beverages and has numerous other applications. Therefore, generating SCM mutants with improved stability is an active area of research to broaden the range of its potential applications. In this study, we focused on the Cys41 residue of SCM, which is a single cysteine residue present at a structurally important position. This residue is often substituted with Ser. However, this substitution may destabilize SCM because Cys41 is buried in the hydrophobic core of the protein. Therefore, we designed mutants that substituted Ala, Val, and Leu for this residue, namely C41A, C41V, and C41L. We characterized these three mutants, SCM C41S, and wild type (WT). Differential scanning fluorimetric analysis revealed that substituting Cys41 with Ala or Val increased the thermal stability of SCM, while substitution with Ser or Leu decreased its stability. Determination of the crystal structures of SCM C41A and C41V mutants revealed that the overall structures and main chain structures around the 41st residue of both mutants were almost identical to the WT. On the other hand, the orientations of the amino acid side chains near the 41st residue differed among the SCM variants. Taken together, our results indicate that substituting Cys41 with Ala or Val increases the stability of SCM and provide insight into the structural basis of this improvement.
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Affiliation(s)
- Kyosuke Ohnuma
- School of Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Atsuko Yamashita
- School of Pharmaceutical Sciences, Okayama University, Okayama, Japan
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1, Tsushima-naka, Kita-ku, Okayama, 700-8530, Japan
| | - Norihisa Yasui
- School of Pharmaceutical Sciences, Okayama University, Okayama, Japan.
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1, Tsushima-naka, Kita-ku, Okayama, 700-8530, Japan.
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4
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Österlund N, Frankel R, Carlsson A, Thacker D, Karlsson M, Matus V, Gräslund A, Emanuelsson C, Linse S. The C-terminal domain of the antiamyloid chaperone DNAJB6 binds to amyloid-β peptide fibrils and inhibits secondary nucleation. J Biol Chem 2023; 299:105317. [PMID: 37797698 PMCID: PMC10641233 DOI: 10.1016/j.jbc.2023.105317] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 09/13/2023] [Accepted: 09/18/2023] [Indexed: 10/07/2023] Open
Abstract
The DNAJB6 chaperone inhibits fibril formation of aggregation-prone client peptides through interaction with aggregated and oligomeric forms of the amyloid peptides. Here, we studied the role of its C-terminal domain (CTD) using constructs comprising either the entire CTD or the first two or all four of the CTD β-strands grafted onto a scaffold protein. Each construct was expressed as WT and as a variant with alanines replacing five highly conserved and functionally important serine and threonine residues in the first β-strand. We investigated the stability, oligomerization, antiamyloid activity, and affinity for amyloid-β (Aβ42) species using optical spectroscopy, native mass spectrometry, chemical crosslinking, and surface plasmon resonance technology. While DNAJB6 forms large and polydisperse oligomers, CTD was found to form only monomers, dimers, and tetramers of low affinity. Kinetic analyses showed a shift in inhibition mechanism. Whereas full-length DNAJB6 activity is dependent on the serine and threonine residues and efficiently inhibits primary and secondary nucleation, all CTD constructs inhibit secondary nucleation only, independently of the serine and threonine residues, although their dimerization and thermal stabilities are reduced by alanine substitution. While the full-length DNAJB6 inhibition of primary nucleation is related to its propensity to form coaggregates with Aβ, the CTD constructs instead bind to Aβ42 fibrils, which affects the nucleation events at the fibril surface. The retardation of secondary nucleation by DNAJB6 can thus be ascribed to the first two β-strands of its CTD, whereas the inhibition of primary nucleation is dependent on the entire protein or regions outside the CTD.
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Affiliation(s)
- Nicklas Österlund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden.
| | - Rebecca Frankel
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Andreas Carlsson
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Dev Thacker
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Maja Karlsson
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Vanessa Matus
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Cecilia Emanuelsson
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Sara Linse
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden.
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5
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Choi J, Seo S, Lee S, Ko H, Luo Y, Han Y, Shin JH, Cho H, Lee H. Low-Temperature Layer-by-Layer Growth of Semiconducting Few-Layer γ-Graphyne to Exploit Robust Biocompatibility. ACS APPLIED MATERIALS & INTERFACES 2023; 15:41708-41719. [PMID: 37621110 DOI: 10.1021/acsami.3c08446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
The sp-hybridized carbon network in single- or few-layer γ-graphyne (γ-GY) has a polarized electron distribution, which can be crucial in overcoming biosafety issues. Here, we report the low-temperature synthesis, electronic properties, and amyloid fibril nanostructures of electrostatic few-layer γ-GY. ABC stacked γ-GY is synthesized by layer-by-layer growth on a catalytic copper surface, exhibiting intrinsic p-type semiconducting properties in few-layer γ-GY. Thickness-dependent electronic properties of γ-GY elucidate interlayer interactions by electron doping between electrostatic layers and layer stacking-involved modulation of the band gap. Electrostatic few-layer γ-GY induces high electronic sensitivity and intense interaction with amyloid beta (i.e., Aβ40) peptides assembling into elongated mature Aβ40 fibrils. Two-dimensional biocompatible nanostructures of Aβ40 fibrils/few-layer γ-GY enable excellent cell viability and high neuronal differentiation of living cells without external stimulation.
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Affiliation(s)
- Jungsue Choi
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Centre for Integrated Nanostructure Physics, Institute of Basic Science, Suwon 16419, Republic of Korea
| | - Sohyeon Seo
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Creative Research Institute, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Seungeun Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyun Ko
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Yongguang Luo
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Centre for Integrated Nanostructure Physics, Institute of Basic Science, Suwon 16419, Republic of Korea
| | - Yeonsu Han
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jae Hee Shin
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hansang Cho
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyoyoung Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Centre for Integrated Nanostructure Physics, Institute of Basic Science, Suwon 16419, Republic of Korea
- Creative Research Institute, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Republic of Korea
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6
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Sønderby TV, Louros NN, Khodaparast L, Khodaparast L, Madsen DJ, Olsen WP, Moonen N, Nagaraj M, Sereikaite V, Strømgaard K, Rousseau F, Schymkowitz J, Otzen DE. Sequence-targeted Peptides Divert Functional Bacterial Amyloid Towards Destabilized Aggregates and Reduce Biofilm Formation. J Mol Biol 2023; 435:168039. [PMID: 37330291 DOI: 10.1016/j.jmb.2023.168039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 02/27/2023] [Accepted: 02/27/2023] [Indexed: 06/19/2023]
Abstract
Functional bacterial amyloid provides structural stability in biofilm, making it a promising target for anti-biofilm therapeutics. Fibrils formed by CsgA, the major amyloid component in E. coli are extremely robust and can withstand very harsh conditions. Like other functional amyloids, CsgA contains relatively short aggregation-prone regions (APR) which drive amyloid formation. Here, we demonstrate the use of aggregation-modulating peptides to knock down CsgA protein into aggregates with low stability and altered morphology. Remarkably, these CsgA-peptides also modulate fibrillation of the unrelated functional amyloid protein FapC from Pseudomonas, possibly through recognition of FapC segments with structural and sequence similarity with CsgA. The peptides also reduce the level of biofilm formation in E. coli and P. aeruginosa, demonstrating the potential for selective amyloid targeting to combat bacterial biofilm.
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Affiliation(s)
- Thorbjørn V Sønderby
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark; Sino-Danish Center (SDC), Eastern Yanqihu Campus, University of Chinese Academy of Sciences, 380 Huaibeizhuang, Huairou District, Beijing, China. https://twitter.com/@tvs1212
| | - Nikolaos N Louros
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. https://twitter.com/LourosNikos
| | - Ladan Khodaparast
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. https://twitter.com/@LadanKhodapara1
| | - Laleh Khodaparast
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. https://twitter.com/@LalehKhodapara1
| | - Daniel J Madsen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - William P Olsen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark; Sino-Danish Center (SDC), Eastern Yanqihu Campus, University of Chinese Academy of Sciences, 380 Huaibeizhuang, Huairou District, Beijing, China
| | - Nele Moonen
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Madhu Nagaraj
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Vita Sereikaite
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen Ø, Denmark. https://twitter.com/@vitasereikaite
| | - Kristian Strømgaard
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen Ø, Denmark. https://twitter.com/@stromgaardlab
| | - Frederic Rousseau
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. https://twitter.com/@stromgaardlab
| | - Joost Schymkowitz
- Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Herestraat 49, 3000 Leuven, Belgium; Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. https://twitter.com/@stromgaardlab
| | - Daniel E Otzen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark.
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7
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Cha W, Heo C, Lee S, Yun SJ, Cho BW, Ha T, Lee YH. Probing Interfacial Charge Transfer between Amyloid-β and Graphene during Amyloid Fibrillization Using Raman Spectroscopy. ACS NANO 2023; 17:4834-4842. [PMID: 36689575 DOI: 10.1021/acsnano.2c11428] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Charge transfer plays a key role in the structural transformation of amyloid-β proteins (Aβs), as it fibrillizes from small monomers to intermediate oligomers and to ordered fibrils. While the protein fibrillization states have been identified using cryo-electron microscopy, X-ray diffraction, Raman, infrared, terahertz spectroscopies, etc., there is little known about the electronic states during the fibrilization of Aβ protein. Here, we probe the charge transfer of Aβ42 proteins at different aggregation stages adsorbed on monolayer graphene (Gr) and molybdenum disulfide (MoS2) using Raman spectroscopy. Monomers, oligomers, and fibrils prepared in buffer solutions were deposited and dried separately on Gr and MoS2 where well-established characteristic Raman modes (G, 2D for Gr and E2g, A1g for MoS2) were monitored. The shifts in Raman parameters showed that the small Aβ monomers withdraw electrons, whereas fibrils donate electrons to Gr and MoS2. Oligomers undergo transient charge states near the neutrality point. This is explained in terms of modulated carrier concentration in Gr and MoS2. This finding provides insight into the electronic properties of Aβs that could be essential to identifying the onset of toxic fibril forms and developing a straightforward, label-free diagnosis using Gr and MoS2.
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Affiliation(s)
- Wujoon Cha
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
| | - Chaejeong Heo
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
- Institute for Quantum Biophysics, Department of Biophysics, Sungkyunkwan University, Suwon16419, Republic of Korea
| | - Sanghyub Lee
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
- Department of Energy Science and Department of Physics, Sungkyunkwan University, Suwon16419, Republic of Korea
| | - Seok Joon Yun
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee37830, United States
| | - Byeong Wook Cho
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
- Department of Energy Science and Department of Physics, Sungkyunkwan University, Suwon16419, Republic of Korea
| | - Taewoo Ha
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon16419, Republic of Korea
- Department of Energy Science and Department of Physics, Sungkyunkwan University, Suwon16419, Republic of Korea
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8
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Natarajan A, Rangan K, Vadrevu R. Self-assembly of a peptide sequence, EKKE, composed of exclusively charged amino acids: Role of charge in morphology and lead binding. J Pept Sci 2023; 29:e3451. [PMID: 36098076 DOI: 10.1002/psc.3451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 08/14/2022] [Accepted: 09/08/2022] [Indexed: 01/12/2023]
Abstract
The self-assembly of peptides is influenced by their amino acid sequence and other factors including pH, charge, temperature, and solvent. Herein, we explore whether a four-residue sequence, EKKE, consisting of exclusively charged amino acids shows the propensity to form self-assembled ordered nanostructures and whether the overall charge plays any role in morphological and functional properties. From a combination of experimental data provided by Thioflavin T fluorescence, Congo red absorbance, circular dichroism spectroscopy, dynamic light scattering, field emission-scanning electron microscopy, atomic force microscopy, and confocal microscopy, it is clear that the all-polar peptide and charged EKKE sequence shows a pH-dependent tendency to form amyloid-like structures, and the self-assembled entities under acidic, basic and neutral conditions exhibit morphological variation. Additionally, the ability of the self-assembled amyloid nanostructures to bind to the toxic metal, lead (Pb2+ ), was demonstrated from the analysis of the ultraviolet absorbance and X-ray photoelectron spectroscopy data. The modulation at the sequence level for the amyloid-forming EKKE scaffold can further extend its potential role not only in the remediation of other toxic metals but also towards biomedical applications.
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Affiliation(s)
- Aishwarya Natarajan
- Department of Biological Sciences, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, India
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, India
| | - Ramakrishna Vadrevu
- Department of Biological Sciences, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, India
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9
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Funk RHW, Scholkmann F. The significance of bioelectricity on all levels of organization of an organism. Part 1: From the subcellular level to cells. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2023; 177:185-201. [PMID: 36481271 DOI: 10.1016/j.pbiomolbio.2022.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/24/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022]
Abstract
Bioelectricity plays an essential role in the structural and functional organization of biological organisms. In this first article of our three-part series, we summarize the importance of bioelectricity for the basic structural level of biological organization, i.e. from the subcellular level (charges, ion channels, molecules and cell organelles) to cells.
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Affiliation(s)
- Richard H W Funk
- Institute of Anatomy, Center for Theoretical Medicine, TU-Dresden, 01307, Dresden, Germany; Dresden International University, 01067, Dresden, Germany.
| | - Felix Scholkmann
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091, Zurich, Switzerland.
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10
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Chopra H, Bibi S, Singh I, Kamal MA, Islam F, Alhumaydhi FA, Emran TB, Cavalu S. Nanomedicines in the Management of Alzheimer’s Disease: Current View and Future Prospects. Front Aging Neurosci 2022; 14:879114. [PMID: 35875806 PMCID: PMC9304964 DOI: 10.3389/fnagi.2022.879114] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 06/17/2022] [Indexed: 12/27/2022] Open
Abstract
Alzheimer’s disease (AD) is a kind of dementia that creates serious challenges for sufferers’ memory, thinking, and behavior. It commonly targeting the aging population and decay the brain cells, despite attempts have been performed to enhance AD diagnostic and therapeutic techniques. Hence, AD remains incurable owing to its complex and multifactorial consequences and still there is lack of appropriate diagnostics/therapeutics option for this severe brain disorder. Therefore, nanotechnology is currently bringing new tools and insights to improve the previous knowledge of AD and ultimately may provide a novel treatment option and a ray of hope to AD patients. Here in this review, we highlighted the nanotechnologies-based findings for AD, in both diagnostic and therapeutic aspects and explained how advances in the field of nanotechnology/nanomedicine could enhance patient prognosis and quality of life. It is highly expected these emerging technologies could bring a research-based revolution in the field of neurodegenerative disorders and may assist their clinical experiments and develop an efficacious drug for AD also. The main aim of review is to showcase readers the recent advances in nanotechnology-based approaches for treatment and diagnosing of AD.
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Affiliation(s)
- Hitesh Chopra
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Shabana Bibi
- Department of Biosciences, Shifa Tameer-e-Millat University, Islamabad, Pakistan
- Yunnan Herbal Laboratory, College of Ecology and Environmental Sciences, Yunnan University, Kunming, China
- *Correspondence: Shabana Bibi,
| | - Inderbir Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Mohammad Amjad Kamal
- Institutes for Systems Genetics, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, Bangladesh
- Enzymoics, Novel Global Community Educational Foundation, Hebersham, NSW, Australia
| | - Fahadul Islam
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, Bangladesh
| | - Fahad A. Alhumaydhi
- Department of Medical Laboratories, College of Applied Medical Sciences, Qassim University, Buraydah, Saudi Arabia
| | - Talha Bin Emran
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, Bangladesh
- Department of Pharmacy, BGC Trust University Bangladesh, Chittagong, Bangladesh
- Talha Bin Emran,
| | - Simona Cavalu
- Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
- Simona Cavalu,
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11
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Österlund N, Wärmländer SKTS, Gräslund A. Cell-Penetrating Peptides with Unexpected Anti-Amyloid Properties. Pharmaceutics 2022; 14:pharmaceutics14040823. [PMID: 35456657 PMCID: PMC9027922 DOI: 10.3390/pharmaceutics14040823] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/22/2022] [Accepted: 03/31/2022] [Indexed: 11/30/2022] Open
Abstract
Cell-penetrating peptides (CPPs) with sequences derived originally from a prion protein (PrP) have been shown to exhibit both anti-prion and anti-amyloid properties particularly against prion proteins and the amyloid-β (Aβ) peptide active in Alzheimer’s disease. These disease-modifying properties are so far observed in cell cultures and in vitro. The CPP sequences are composed of a hydrophobic signal sequence followed by a highly positively charged hexapeptide segment. The original signal sequence of the prion protein can be changed to the signal sequence of the NCAM1 protein without losing the anti-prion activity. Although the detailed molecular mechanisms of these CPP peptides are not fully understood, they do form amyloid aggregates by themselves, and molecular interactions between the CPPs and PrP/Aβ can be observed in vitro using various spectroscopic techniques. These initial intermolecular interactions appear to re-direct the aggregation pathways for prion/amyloid formation to less cell-toxic molecular structures (i.e., co-aggregates), which likely is why the disease-inducing PrP/Aβ aggregation is counteracted in vivo.
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Affiliation(s)
- Nicklas Österlund
- Department of Biochemistry and Biophysics, Arrhenius Laboratories, Stockholm University, 10691 Stockholm, Sweden;
| | - Sebastian K. T. S. Wärmländer
- Department of Archaeology and Classical Studies, Stockholm University, 10691 Stockholm, Sweden;
- CellPept Sweden AB, Kvarngatan 10B, 11847 Stockholm, Sweden
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Arrhenius Laboratories, Stockholm University, 10691 Stockholm, Sweden;
- CellPept Sweden AB, Kvarngatan 10B, 11847 Stockholm, Sweden
- Correspondence:
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12
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Al Adem K, Shanti A, Srivastava A, Homouz D, Thomas SA, Khair M, Stefanini C, Chan V, Kim TY, Lee S. Linking Alzheimer’s Disease and Type 2 Diabetes: Characterization and Inhibition of Cytotoxic Aβ and IAPP Hetero-Aggregates. Front Mol Biosci 2022; 9:842582. [PMID: 35372522 PMCID: PMC8968156 DOI: 10.3389/fmolb.2022.842582] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 02/07/2022] [Indexed: 12/18/2022] Open
Abstract
The cytotoxic self-aggregation of β-amyloid (Aβ) peptide and islet amyloid polypeptide (IAPP) is implicated in the pathogenesis of Alzheimer’s disease (AD) and Type 2 diabetes (T2D), respectively. Increasing evidence, particularly the co-deposition of Aβ and IAPP in both brain and pancreatic tissues, suggests that Aβ and IAPP cross-interaction may be responsible for a pathological link between AD and T2D. Here, we examined the nature of IAPP-Aβ40 co-aggregation and its inhibition by small molecules. In specific, we characterized the kinetic profiles, morphologies, secondary structures and toxicities of IAPP-Aβ40 hetero-assemblies and compared them to those formed by their homo-assemblies. We demonstrated that monomeric IAPP and Aβ40 form stable hetero-dimers and hetero-assemblies that further aggregate into β-sheet-rich hetero-aggregates that are toxic (cell viability <50%) to both PC-12 cells, a neuronal cell model, and RIN-m5F cells, a pancreatic cell model for β-cells. We then selected polyphenolic candidates to inhibit IAPP or Aβ40 self-aggregation and examined the inhibitory effect of the most potent candidate on IAPP-Aβ40 co-aggregation. We demonstrated that epigallocatechin gallate (EGCG) form inter-molecular hydrogen bonds with each of IAPP and Aβ40. We also showed that EGCG reduced hetero-aggregate formation and resulted in lower β-sheets content and higher unordered structures in IAPP-Aβ40-EGCG samples. Importantly, we showed that EGCG is highly effective in reducing the toxicity of IAPP-Aβ40 hetero-aggregates on both cell models, specifically at concentrations that are equivalent to or are 2.5-fold higher than the mixed peptide concentrations. To the best of our knowledge, this is the first study to report the inhibition of IAPP-Aβ40 co-aggregation by small molecules. We conclude that EGCG is a promising candidate to prevent co-aggregation and cytotoxicity of IAPP-Aβ40, which in turn, contribute to the pathological link between AD and T2D.
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Affiliation(s)
- Kenana Al Adem
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Aya Shanti
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Amit Srivastava
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Dirar Homouz
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
- Department of Physics, University of Houston, Houston, TX, United States
- Center for Theoretical Biological Physics, Rice University, Houston, TX, United States
| | - Sneha Ann Thomas
- Core Technology Platforms, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Mostafa Khair
- Core Technology Platforms, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Cesare Stefanini
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Vincent Chan
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Tae-Yeon Kim
- Department of Civil Infrastructure and Environmental Engineering, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Sungmun Lee
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
- Khalifa University’s Center for Biotechnology, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
- *Correspondence: Sungmun Lee,
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13
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Zhang J, Yao P, You S, Qi W, Su R, He Z. Study on the Kinetics and Mechanism of Ferrocene-Tripeptide Inhibiting Insulin Aggregation. J Mater Chem B 2022; 10:7780-7788. [DOI: 10.1039/d2tb01085b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Peptides are gaining popularity as neurodegenerative disease-targeted drugs due to their medicinal value and the simplicity in the biomedicine and pharmaceutical industry field. In this study, based on previously studied...
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14
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Król S, Österlund N, Vosough F, Jarvet J, Wärmländer S, Barth A, Ilag LL, Magzoub M, Gräslund A, Mörman C. The amyloid-inhibiting NCAM-PrP peptide targets Aβ peptide aggregation in membrane-mimetic environments. iScience 2021; 24:102852. [PMID: 34381976 PMCID: PMC8340127 DOI: 10.1016/j.isci.2021.102852] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/27/2021] [Accepted: 07/09/2021] [Indexed: 01/16/2023] Open
Abstract
Substantial research efforts have gone into elucidating the role of protein misfolding and self-assembly in the onset and progression of Alzheimer's disease (AD). Aggregation of the Amyloid-β (Aβ) peptide into insoluble fibrils is closely associated with AD. Here, we use biophysical techniques to study a peptide-based approach to target Aβ amyloid aggregation. A peptide construct, NCAM-PrP, consists of a largely hydrophobic signal sequence linked to a positively charged hexapeptide. The NCAM-PrP peptide inhibits Aβ amyloid formation by forming aggregates which are unavailable for further amyloid aggregation. In a membrane-mimetic environment, Aβ and NCAM-PrP form specific heterooligomeric complexes, which are of lower aggregation states compared to Aβ homooligomers. The Aβ:NCAM-PrP interaction appears to take place on different aggregation states depending on the absence or presence of a membrane-mimicking environment. These insights can be useful for the development of potential future therapeutic strategies targeting Aβ at several aggregation states.
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Affiliation(s)
- Sylwia Król
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Nicklas Österlund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Faraz Vosough
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Jüri Jarvet
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Sebastian Wärmländer
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Andreas Barth
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Leopold L. Ilag
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, 106 91, Sweden
| | - Mazin Magzoub
- Biology Program, Division of Science, New York University Abu Dhabi, Box 129188, Abu Dhabi, United Arab Emirates
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Cecilia Mörman
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
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15
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Abstract
AbstractChaperones protect other proteins against misfolding and aggregation, a key requirement for maintaining biological function. Experimental observations of changes in solubility of amyloid proteins in the presence of certain chaperones are discussed here in terms of thermodynamic driving forces. We outline how chaperones can enhance amyloid solubility through the formation of heteromolecular aggregates (co-aggregates) based on the second law of thermodynamics and the flux towards equal chemical potential of each compound in all phases of the system. Higher effective solubility of an amyloid peptide in the presence of chaperone implies that the chemical potential of the peptide is higher in the aggregates formed under these conditions compared to peptide-only aggregates. This must be compensated by a larger reduction in chemical potential of the chaperone in the presence of peptide compared to chaperone alone. The driving force thus relies on the chaperone being very unhappy on its own (high chemical potential), thus gaining more free energy than the amyloid peptide loses upon forming the co-aggregate. The formation of heteromolecular aggregates also involves the kinetic suppression of the formation of homomolecular aggregates. The unhappiness of the chaperone can explain the ability of chaperones to favour an increased population of monomeric client protein even in the absence of external energy input, and with broad client specificity. This perspective opens for a new direction of chaperone research and outlines a set of outstanding questions that aim to provide additional cues for therapeutic development in this area.
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16
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Manek E, Darvas F, Petroianu GA. Use of Biodegradable, Chitosan-Based Nanoparticles in the Treatment of Alzheimer's Disease. Molecules 2020; 25:E4866. [PMID: 33096898 PMCID: PMC7587961 DOI: 10.3390/molecules25204866] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 10/15/2020] [Accepted: 10/16/2020] [Indexed: 12/31/2022] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder that affects more than 24 million people worldwide and represents an immense medical, social and economic burden. While a vast array of active pharmaceutical ingredients (API) is available for the prevention and possibly treatment of AD, applicability is limited by the selective nature of the blood-brain barrier (BBB) as well as by their severe peripheral side effects. A promising solution to these problems is the incorporation of anti-Alzheimer drugs in polymeric nanoparticles (NPs). However, while several polymeric NPs are nontoxic and biocompatible, many of them are not biodegradable and thus not appropriate for CNS-targeting. Among polymeric nanocarriers, chitosan-based NPs emerge as biodegradable yet stable vehicles for the delivery of CNS medications. Furthermore, due to their mucoadhesive character and intrinsic bioactivity, chitosan NPs can not only promote brain penetration of drugs via the olfactory route, but also act as anti-Alzheimer therapeutics themselves. Here we review how chitosan-based NPs could be used to address current challenges in the treatment of AD; with a specific focus on the enhancement of blood-brain barrier penetration of anti-Alzheimer drugs and on the reduction of their peripheral side effects.
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Affiliation(s)
- Eniko Manek
- College of Medicine & Health Sciences, Khalifa University, Abu Dhabi POB 12 77 88, UAE;
| | - Ferenc Darvas
- Herbert Wertheim College of Medicine, Florida International University, 11200 SW 8th St, Miami, FL 33199, USA;
| | - Georg A. Petroianu
- College of Medicine & Health Sciences, Khalifa University, Abu Dhabi POB 12 77 88, UAE;
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Tabassum S, Sheikh AM, Yano S, Ikeue T, Mitaki S, Michikawa M, Nagai A. A Cationic Gallium Phthalocyanine Inhibits Amyloid β Peptide Fibril Formation. Curr Alzheimer Res 2020; 17:589-600. [PMID: 33032510 DOI: 10.2174/1567205017666201008112002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 08/05/2020] [Accepted: 08/12/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Amyloid β (Aβ) peptide deposition is considered as the main cause of Alzheimer's disease (AD). Previously, we have shown that a Zn containing neutral phthalocyanine (Zn-Pc) inhibits Aβ fibril formation. OBJECTIVE The objective of this study is to investigate the effects of a cationic gallium containing Pc (GaCl-Pc) on Aβ fibril formation process. METHODS AND RESULT Aβ fibril formation was induced by incubating synthetic Aβ peptides in a fibril forming buffer, and the amount of fibril was evaluated by ThT fluorescence assay. GaCl-Pc dosedependently inhibited both Aβ1-40 and Aβ1-42 fibril formation. It mainly inhibited the elongation phase of Aβ1-42 fibril formation kinetics, but not the lag phase. Western blotting results showed that it did not inhibit its oligomerization process, rather increased it. Additionally, GaCl-Pc destabilized preformed Aβ1- 42 fibrils dose-dependently in vitro condition, and decreased Aβ levels in the brain slice culture of APP transgenic AD model mice (J20 strain). Near-infrared scanning results showed that GaCl-Pc had the ability to bind to Aβ1-42. MTT assay demonstrated that GaCl-Pc did not have toxicity towards a neuronal cell line (A1) in culture rather, showed protective effects on Aβ-induced toxicity. Moreover, it dosedependently decreased Aβ-induced reactive oxygen species levels in A1 culture. CONCLUSION Thus, our result demonstrated that GaCl-Pc decreased Aβ aggregation and destabilized the preformed fibrils. Since cationic molecules show a better ability to cross the blood-brain barrier, cationic GaCl-Pc could be important for the therapy of AD.
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Affiliation(s)
- Shatera Tabassum
- Department of Laboratory Medicine, Faculty of Medicine, Shimane University, 89-1 Enya Cho, Izumo 693-8501, Japan
| | - Abdullah Md Sheikh
- Department of Laboratory Medicine, Faculty of Medicine, Shimane University, 89-1 Enya Cho, Izumo 693-8501, Japan
| | - Shozo Yano
- Department of Laboratory Medicine, Faculty of Medicine, Shimane University, 89-1 Enya Cho, Izumo 693-8501, Japan
| | - Takahisa Ikeue
- Department of Chemistry, Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan
| | - Shingo Mitaki
- Department of Neurology, Faculty of Medicine, Shimane University, 89-1 Enya Cho, Izumo 693-8501, Japan
| | - Makoto Michikawa
- Department of Biochemistry, Graduate School of Medical Sciences, Nagoya City University, Kawasumi 1 Mizuho, Nagoya 467-8601, Japan
| | - Atsushi Nagai
- Department of Neurology, Faculty of Medicine, Shimane University, 89-1 Enya Cho, Izumo 693-8501, Japan
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Bucciantini M, Leri M, Stefani M, Melki R, Zecchi-Orlandini S, Nosi D. The Amphipathic GM1 Molecule Stabilizes Amyloid Aggregates, Preventing their Cytotoxicity. Biophys J 2020; 119:326-336. [PMID: 32579964 DOI: 10.1016/j.bpj.2020.06.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 05/20/2020] [Accepted: 06/02/2020] [Indexed: 12/20/2022] Open
Abstract
Amyloid aggregates have been demonstrated to exert cytotoxic effects in several diseases. It is widely accepted that the complex and fascinating aggregation pathway involves a series of steps during which many heterogeneous intermediates are generated. This process may be greatly potentiated by the presence of amphipathic components of plasma membrane because they may serve as interaction, condensation, and nucleation points. However, there are few data regarding structural alterations induced by the binding between the amyloid fibrils and membrane components and its direct effects on cell integrity. In this study, we found, by 1-anilinonaphthalene 8-sulfonic acid and transmission electron microscopy/fast Fourier transform, that yeast prion Sup35 oligomers showed higher structural uniformity and altered surface properties when grown in the presence of monosialotetrahexosylganglioside, a component of the cell membrane. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and confocal/sensitized Förster resonance energy transfer analyses revealed that these fibrils showed low cytotoxicity and affinity to plasma membrane. Moreover, time-lapse analysis of Sup35 oligomer fibrillation on cells suggested that the amyloid aggregation process per se exerts cytotoxic effects through the interaction of amyloid intermediates with plasma membrane components. These data provide, to our knowledge, new insights to understand the mechanism of amyloid growth and cytotoxicity in the pathogenesis of amyloid diseases.
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Affiliation(s)
- Monica Bucciantini
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio," University of Florence, Florence, Italy.
| | - Manuela Leri
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio," University of Florence, Florence, Italy; Department of Neuroscience, Psychology, Area of Medicine and Health of the Child of the University of Florence, Florence, Italy
| | - Massimo Stefani
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio," University of Florence, Florence, Italy
| | - Ronald Melki
- Institut Francois Jacob, CEA and Laboratory of Neurodegenerative Diseases, CNRS 92265, Fontenay-Aux-Roses, France
| | | | - Daniele Nosi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
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19
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Nirmalraj PN, List J, Battacharya S, Howe G, Xu L, Thompson D, Mayer M. Complete aggregation pathway of amyloid β (1-40) and (1-42) resolved on an atomically clean interface. SCIENCE ADVANCES 2020; 6:eaaz6014. [PMID: 32285004 PMCID: PMC7141833 DOI: 10.1126/sciadv.aaz6014] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 01/14/2020] [Indexed: 05/22/2023]
Abstract
To visualize amyloid β (Aβ) aggregates requires an uncontaminated and artifact-free interface. This paper demonstrates the interface between graphene and pure water (verified to be atomically clean using tunneling microscopy) as an ideal platform for resolving size, shape, and morphology (measured by atomic force microscopy) of Aβ-40 and Aβ-42 peptide assemblies from 0.5 to 150 hours at a 5-hour time interval with single-particle resolution. After confirming faster aggregation of Aβ-42 in comparison to Aβ-40, a stable set of oligomers with a diameter distribution of ~7 to 9 nm was prevalently observed uniquely for Aβ-42 even after fibril appearance. The interaction energies between a distinct class of amyloid aggregates (dodecamers) and graphene was then quantified using molecular dynamics simulations. Last, differences in Aβ-40 and Aβ-42 networks were resolved, wherein only Aβ-42 fibrils were aligned through lateral interactions over micrometer-scale lengths, a property that could be exploited in the design of biofunctional materials.
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Affiliation(s)
- Peter Niraj Nirmalraj
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
- Transport at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf CH-8600, Switzerland
- Corresponding author.
| | - Jonathan List
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
| | - Shayon Battacharya
- Department of Physics, Bernal Institute, University of Limerick, Limerick V94T9PX, Ireland
| | - Geoffrey Howe
- Department of Physics, Bernal Institute, University of Limerick, Limerick V94T9PX, Ireland
| | - Liang Xu
- Department of Physics, Bernal Institute, University of Limerick, Limerick V94T9PX, Ireland
| | - Damien Thompson
- Department of Physics, Bernal Institute, University of Limerick, Limerick V94T9PX, Ireland
| | - Michael Mayer
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
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Linse S. Expression and Purification of Intrinsically Disordered Aβ Peptide and Setup of Reproducible Aggregation Kinetics Experiment. Methods Mol Biol 2020; 2141:731-754. [PMID: 32696387 DOI: 10.1007/978-1-0716-0524-0_38] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High purity and sequence homogeneity of intrinsically disordered proteins are prerequisites for reproducible studies of the kinetics and equilibrium of their self-assembly reactions. Starting from the pure state enables quantitative studies of intrinsic and extrinsic factors in the process to understand its molecular determinants. Here we outline detailed protocols for recombinant expression and purification of ultra-pure amyloid β peptide (Aβ) in sequence homogeneous form, which allows for the setup of reproducible kinetic self-assembly experiments.
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Affiliation(s)
- Sara Linse
- Biochemistry and Structural Biology, Lund University, Lund, Sweden.
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21
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Zhang T, Gering I, Kutzsche J, Nagel-Steger L, Willbold D. Toward the Mode of Action of the Clinical Stage All-d-Enantiomeric Peptide RD2 on Aβ42 Aggregation. ACS Chem Neurosci 2019; 10:4800-4809. [PMID: 31710458 DOI: 10.1021/acschemneuro.9b00458] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The aggregation of amyloid-β (Aβ) into oligomers and fibrillary structures is critical for the pathogenesis of Alzheimer's disease (AD). Recently, research effort has been focused on developing novel agents that can preferentially suppress Aβ oligomer mediated toxicities, for example, by directly targeting these toxic assemblies. The compound RD2 has been developed and optimized for Aβ42 monomer binding and stabilization of the monomer in its native intrinsically disordered conformation. It has been demonstrated to improve and even reverse the cognitive and behavioral deficits in AD mouse models, while the detailed mechanism of action is not fully clarified. Here we focused on exploring the interaction between RD2 and Aβ42 monomers and its consequences for the fibrillation of Aβ42. RD2 binds to Aβ42 monomers with nanomolar affinities, according to microscale thermophoresis and surface plasmon resonance measurements. Complexes between RD2 and Aβ42 monomers are formed at 1:1 and other stoichiometries, as revealed by analytical ultracentrifugation. At substoichiometric levels, RD2 slows down the secondary structure conversion of Aβ42 and significantly delays the fibril formation. Our research provides experimental evidence in supporting that RD2 eliminates toxic Aβ assemblies by stabilizing Aβ monomers in their native intrinsically disordered conformation. The study further supports the promising application of RD2 in counteracting Aβ aggregation related pathologies.
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Affiliation(s)
- Tao Zhang
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Ian Gering
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Janine Kutzsche
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Luitgard Nagel-Steger
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Dieter Willbold
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
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Evgrafova Z, Rothemund S, Voigt B, Hause G, Balbach J, Binder WH. Synthesis and Aggregation of Polymer-Amyloid β Conjugates. Macromol Rapid Commun 2019; 41:e1900378. [PMID: 31631446 DOI: 10.1002/marc.201900378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 09/20/2019] [Indexed: 12/13/2022]
Abstract
Modulating the assembly of medically relevant peptides and proteins via macromolecular engineering is an important step in modifying their overall pathological effects. The synthesis of polymer-peptide conjugates composed of the amyloidogenic Alzheimer peptide, Aβ1-40 , and poly(oligo(ethylene glycol)m acrylates) (m = 2,3) with different molecular weights (Mn = 1400-6600 g mol-1 ) is presented here. The challenging conjugation of a synthetic polymer to an in situ aggregating protein is established via two different coupling strategies, only successful for polymers with molecular weights not exceeding 6600 g mol-1 , relying on resin-based synthesis or solution-based coupling chemistries. The conjugates are characterized by high-performance liquid chromatography and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. The aggregation of these polymer-Aβ1-40 conjugates, as monitored via thioflavine-T (ThT)-fluorescence spectroscopy, is accelerated mainly upon attaching the polymers. However, the appearance of the observed fibrils is different from those composed of native Aβ1-40, specifically with respect to length and morphology of the obtained aggregates. Instead of long, unbranched fibrils characteristic for Aβ1-40 , bundles of short aggregates are observed for the conjugates. Finally, the ThT kinetics and morphologies of Aβ1-40 fibrils formed in the presence of the conjugates give some mechanistic insights.
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Affiliation(s)
- Zhanna Evgrafova
- Faculty of Natural Science II, Institute of Chemistry, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120, Halle (Saale), Germany
| | - Sven Rothemund
- Core Unit Peptide Technologies, Liebigstraße 21, D-04103, Leipzig, Germany
| | - Bruno Voigt
- Faculty of Natural Science II, Institute of Physics, Martin-Luther University Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120, Halle (Saale), Germany
| | - Gerd Hause
- Martin-Luther University Halle-Wittenberg, Biocenter, Weinbergweg 22, D-06120, Halle (Saale), Germany
| | - Jochen Balbach
- Faculty of Natural Science II, Institute of Physics, Martin-Luther University Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120, Halle (Saale), Germany
| | - Wolfgang H Binder
- Faculty of Natural Science II, Institute of Chemistry, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120, Halle (Saale), Germany
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Sequence Variant and Posttranslational Modification Analysis During Cell Line Selection via High-Throughput Peptide Mapping. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019. [PMID: 31347050 DOI: 10.1007/978-3-030-15950-4_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
Selection of high-producing lead and backup cell lines with high-fidelity primary structure is a major goal of cell line development of protein therapeutics. Conventional techniques for sequence variant analysis, such as mass spectrometry (MS) and next-generation sequencing (NGS) have limitations on the sample number and turnaround time, thus often are only applied at the final stages of development, where an undesired lead or backup clone could cause a significant delay in project timeline. Here we presented a high-throughput (HT) peptide mapping workflow which can be applied at early stages of cell line selection for testing of a batch of 30-40 clones within 2-week turnaround while reporting valuable information on sequence variants and posttranslational modifications (PTMs). The successful application of this workflow was demonstrated for two mAb programs. Multiple clones were removed from a total of 33 mAb-1 clones using various criteria: nine clones contained at least one >1% upregulated unknown peptide ions, 11 clones contained at least eight >0.1% upregulated unknowns, and six clones contained upregulated critical PTMs. For mAb-2, light chain (LC) sequence extension of approximately 30 amino acids were detected in 6 out of 36 clones at levels up to 11%. Besides, a Q to H mutation at ~30% was detected in the heavy chain (HC) of a single clone. Q to H mutation has mass change of 9.00 Da and failed to be detected by intact mass analysis. Rapid PTM quantitation also facilitated the selection of clones with desirable quality attributes, such as N-glycan profile. Hence, we demonstrated a risk-reducing strategy where abnormal clones could be detected at earlier stages of cell line selection, which should result in reduced and more predictable timeline of cell line development.
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Bouyacoub Y, Falfoul Y, Ouederni M, Sayeb M, Chedli A, Chargui M, Sassi H, Chakroun Chenguel I, Munier FL, El Matri L, Abdelhak S, Cheour M. Granular type I corneal dystrophy in a large consanguineous Tunisian family with homozygous p.R124S mutation in the TGFBI gene. Ophthalmic Genet 2019; 40:329-337. [PMID: 31322463 DOI: 10.1080/13816810.2019.1639202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Purpose: We report the clinical features and the mutational analysis in a large Tunisian family with granular corneal dystrophy type I (GCD1). Patients and Methods: Thirty-three members of the Tunisian family underwent a complete ophthalmologic examination. DNA extraction and direct Sanger sequencing of the exons 4 and 12 of transforming growth factor β Induced (TGFBI) gene was performed for 42 members. For the molecular modeling of TGFBI protein, we used pGenTHREADER method to identify templates, 3D-EXPRESSO program to align sequences, MODELLER to get a homology model for the FAS1 (fasciclin-like) domains and finally NOMAD-ref web server for the energy minimization. Results: The diagnosis of GCD1 was clinically and genetically confirmed. Sequencing of exon 4 of TGFBI gene revealed the p.[R124S] mutation at heterozygous and homozygous states in patients with different clinical severities. Visual acuity was severely affected in the homozygous patients leading to a first penetrating keratoplasty. Recurrence occurred rapidly, began in the seat of the corneal stitches and remained superficial up to 40 years after the graft. For heterozygous cases, visual acuity ranged from 6/10 to 10/10. Corneal opacities were deeper and predominating in the stromal center. According to bioinformatic analysis, this mutation likely perturbs the protein physicochemical properties and reduces its solubility without structural modification. Conclusions: Our study describes for the first time phenotype-genotype correlation in a large Tunisian family with GCDI and illustrates for the first time clinical and histopathological presentation of homozygous p.[R124S] mutation. These results help to understand pathophysiology of the disease.
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Affiliation(s)
- Yosra Bouyacoub
- Laboratory of Biomedical Genetics and Oncogenetics, Université Tunis El Manar, Institut Pasteur de Tunis, LR16IPT05 , Tunis , Tunisia.,Institut Supérieur de Biotechnologie, Université de Monastir , Monastir , Tunisia
| | - Yousra Falfoul
- B Department, Hedi Raies Institute of Ophthalmology , Tunis , Tunisia.,Oculogenetic Laboratory, LR14SP01, Hedi Raies Institute of Ophthalmology , Tunis , Tunisia
| | - Mariem Ouederni
- Department of Ophthalmology, Habib Thameur Hospital , Tunis , Tunisia
| | - Marwa Sayeb
- Laboratory of Biomedical Genetics and Oncogenetics, Université Tunis El Manar, Institut Pasteur de Tunis, LR16IPT05 , Tunis , Tunisia
| | - Aschraf Chedli
- Department of Anatomopathology, Habib Thameur Hospital , Tunis , Tunisia
| | - Mariem Chargui
- Laboratory of Biomedical Genetics and Oncogenetics, Université Tunis El Manar, Institut Pasteur de Tunis, LR16IPT05 , Tunis , Tunisia
| | - Hela Sassi
- Department of Ophthalmology, Habib Thameur Hospital , Tunis , Tunisia
| | | | - Francis L Munier
- Jules-Gonin Eye Hospital, University of Lausanne , Lausanne , Switzerland
| | - Leila El Matri
- B Department, Hedi Raies Institute of Ophthalmology , Tunis , Tunisia.,Oculogenetic Laboratory, LR14SP01, Hedi Raies Institute of Ophthalmology , Tunis , Tunisia
| | - Sonia Abdelhak
- Laboratory of Biomedical Genetics and Oncogenetics, Université Tunis El Manar, Institut Pasteur de Tunis, LR16IPT05 , Tunis , Tunisia
| | - Monia Cheour
- Department of Ophthalmology, Habib Thameur Hospital , Tunis , Tunisia
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25
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Zhang T, Loschwitz J, Strodel B, Nagel-Steger L, Willbold D. Interference with Amyloid-β Nucleation by Transient Ligand Interaction. Molecules 2019; 24:E2129. [PMID: 31195746 PMCID: PMC6600523 DOI: 10.3390/molecules24112129] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/02/2019] [Accepted: 06/04/2019] [Indexed: 12/20/2022] Open
Abstract
Amyloid-β peptide (Aβ) is an intrinsically disordered protein (IDP) associated with Alzheimer's disease. The structural flexibility and aggregation propensity of Aβ pose major challenges for elucidating the interaction between Aβ monomers and ligands. All-D-peptides consisting solely of D-enantiomeric amino acid residues are interesting drug candidates that combine high binding specificity with high metabolic stability. Here we characterized the interaction between the 12-residue all-D-peptide D3 and Aβ42 monomers, and how the interaction influences Aβ42 aggregation. We demonstrate for the first time that D3 binds to Aβ42 monomers with submicromolar affinities. These two highly unstructured molecules are able to form complexes with 1:1 and other stoichiometries. Further, D3 at substoichiometric concentrations effectively slows down the β-sheet formation and Aβ42 fibrillation by modulating the nucleation process. The study provides new insights into the molecular mechanism of how D3 affects Aβ assemblies and contributes to our knowledge on the interaction between two IDPs.
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Affiliation(s)
- Tao Zhang
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
| | - Jennifer Loschwitz
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
| | - Birgit Strodel
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
| | - Luitgard Nagel-Steger
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
| | - Dieter Willbold
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
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26
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Sahoo BR, Genjo T, Nakayama TW, Stoddard AK, Ando T, Yasuhara K, Fierke CA, Ramamoorthy A. A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation. Chem Sci 2019; 10:3976-3986. [PMID: 31015938 PMCID: PMC6457205 DOI: 10.1039/c8sc05771k] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 02/25/2019] [Indexed: 12/24/2022] Open
Abstract
In humans, β-amyloid and islet amyloid polypeptide (IAPP, also known as amylin) aggregations are linked to Alzheimer's disease and type-2 diabetes, respectively. There is significant interest in better understanding the aggregation process by using chemical tools. Here, we show the ability of a cationic polymethacrylate-copolymer (PMAQA) to quickly induce a β-hairpin structure and accelerate the formation of amorphous aggregates of β-amyloid-1-40, whereas it constrains the conformational plasticity of amylin for several days and slows down its aggregation at substoichiometric polymer concentrations. NMR experiments and microsecond scale atomistic molecular dynamics simulations reveal that PMAQA interacts with β-amyloid-1-40 residues spanning regions K16-V24 and A30-V40 followed by β-sheet induction. For amylin, it binds strongly close to the amyloid core domain (NFGAIL) and restrains its structural rearrangement. High-speed atomic force microscopy and transmission electron microscopy experiments show that PMAQA blocks the nucleation and fibrillation of amylin, whereas it induces the formation of amorphous aggregates of β-amyloid-1-40. Thus, the reported study provides a valuable approach to develop polymer-based amyloid inhibitors to suppress the formation of toxic intermediates of β-amyloid-1-40 and amylin.
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Affiliation(s)
- Bikash R Sahoo
- Biophysics and Department of Chemistry , University of Michigan , Ann Arbor , MI 48109-1055 , USA .
| | - Takuya Genjo
- Biophysics and Department of Chemistry , University of Michigan , Ann Arbor , MI 48109-1055 , USA .
| | - Takahiro W Nakayama
- Bio-AFM Frontier Research Center , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Andrea K Stoddard
- Biophysics and Department of Chemistry , University of Michigan , Ann Arbor , MI 48109-1055 , USA .
| | - Toshio Ando
- Bio-AFM Frontier Research Center , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Kazuma Yasuhara
- Graduate School of Materials Science , Nara Institute of Science and Technology , Ikoma , Nara 6300192 , Japan
| | - Carol A Fierke
- Biophysics and Department of Chemistry , University of Michigan , Ann Arbor , MI 48109-1055 , USA .
- Department of Chemistry , Texas A&M University , College Station , TX 77843 , USA
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry , University of Michigan , Ann Arbor , MI 48109-1055 , USA .
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27
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Jia L, Wang W, Sang J, Wei W, Zhao W, Lu F, Liu F. Amyloidogenicity and Cytotoxicity of a Recombinant C-Terminal His 6-Tagged Aβ 1-42. ACS Chem Neurosci 2019; 10:1251-1262. [PMID: 30537813 DOI: 10.1021/acschemneuro.8b00333] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Aggregation of amyloid β peptide (Aβ) is closely associated with the occurrence and development of Alzheimer's disease (AD). Reproducible and detailed studies on the aggregation kinetics and structure of various aggregates have been conducted using recombinant Aβ peptides. While the His6-tag is commonly used in the purification of recombinant proteins due to its great simplicity and affinity, there is little information on the aggregation of His6-tagged Aβ and its corresponding cytotoxicity. Moreover, it is also unclear whether there is an effect of the His6-tag on the amyloidogenicity and cytotoxicity of recombinant Aβ1-42. Herein, a method to express and purify a mutant C-terminally His6-tagged Aβ1-42 (named as Aβ1-42-His6) from Escherichia coli was described. Aβ1-42-His6 aggregated into β-sheet-rich fibrils as shown by thioflavin T fluorescence, atomic force microscopy and circular dichroism spectroscopy. Moreover, the fibrillar recombinant Aβ1-42-His6 showed strong toxicity toward PC12 cells in vitro. Molecular dynamics simulations revealed that the His6-tag contributed little to the secondary structure and intermolecular interactions, including hydrophobic interactions, salt bridges, and hydrogen bonding of the fibrillar pentamer of Aβ1-42. This highlights the biological importance of modification on the molecular structure of Aβ. Thus, the easily purified high-quality Aβ1-42-His6 offers great advantages for screening aggregation inhibitors or in vitro confirmation of rationally designed drugs for the treatment of AD.
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Affiliation(s)
- Longgang Jia
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Wenjuan Wang
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Jingcheng Sang
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Wei Wei
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Wenping Zhao
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Fuping Lu
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Fufeng Liu
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
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28
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Evgrafova Z, Voigt B, Roos AH, Hause G, Hinderberger D, Balbach J, Binder WH. Modulation of amyloid β peptide aggregation by hydrophilic polymers. Phys Chem Chem Phys 2019; 21:20999-21006. [DOI: 10.1039/c9cp02683e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Careful balance of hydrophilicity of precisely engineered polymers alters aggregation of the amyloidogenic protein Aβ1–40.
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Affiliation(s)
- Zhanna Evgrafova
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Chemistry
- D-06120 Halle (Saale)
- Germany
| | - Bruno Voigt
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Physics
- D-06120 Halle (Saale)
- Germany
| | - Andreas H. Roos
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Chemistry
- D-06120 Halle (Saale)
- Germany
| | - Gerd Hause
- Martin-Luther University Halle-Wittenberg
- Biocenter
- D-06120 Halle (Saale)
- Germany
| | - Dariush Hinderberger
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Chemistry
- D-06120 Halle (Saale)
- Germany
| | - Jochen Balbach
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Physics
- D-06120 Halle (Saale)
- Germany
| | - Wolfgang H. Binder
- Martin-Luther University Halle-Wittenberg
- Faculty of Natural Science II
- Institute of Chemistry
- D-06120 Halle (Saale)
- Germany
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29
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Li X, Xie B, Sun Y. Basified Human Lysozyme: A Potent Inhibitor against Amyloid β-Protein Fibrillogenesis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15569-15577. [PMID: 30407837 DOI: 10.1021/acs.langmuir.8b03278] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The aggregation of amyloid β-proteins (Aβ) has been recognized as a key process in the pathogenesis of Alzheimer's disease (AD), so inhibiting Aβ aggregation is an important strategy to prevent the onset and treatment of AD. Our recent work indicated that decreasing the positive charges (or introducing negative charges) on human lysozyme (hLys) was unfavorable in keeping the inhibiting capability of hLys on Aβ aggregation. Therefore, we have herein proposed to basify hLys by conversion of the carboxyl groups into amino groups by modification with ethylene diamine. Basified hLys (Lys-B) preparations of three modification degrees (MDs), denoted as hLys-B1 (MD, 1.5), hLys-B2 (MD, 3.3), and hLys-B3 (MD, 4.4), were synthesized for modulating Aβ fibrillogenesis. The hLys-B preparations kept the stability and biocompatibility as native hLys did, whereas the inhibitory potency of hLys-B on Aβ fibrillogenesis increased with increasing MD. Cytotoxicity analysis showed that cell viability with 2.5 μM hLys-B3 increased from 62.5% (with 25 μM Aβ only) to 76.1%, similar to the case with 12.5 μM hLys (75.5%); cell viability with 6.25 μM hLys-B3 increased to 82.0%, similar to the case with 25 μM hLys (80.9%). The results indicate about four- to fivefold increase in the inhibition efficiency of hLys by the amino modification. Mechanistic analysis suggests that such a superior inhibitory capability of hLys-B was attributed to its more widely distributed positive charges, which promoted broad electrostatic interactions between Aβ and hLys-B. Thus, hLys-B suppressed the conformational transition of Aβ to β-sheet structures at low concentrations (e.g., 2.5 μM hLys-B3), leading to changes in the aggregation pathway and the formation of Aβ species with less cytotoxicity. The findings provided new insights into the development of more potent protein-based inhibitors against Aβ fibrillogenesis.
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Affiliation(s)
- Xi Li
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology , Tianjin University , Tianjin 300354 , China
| | - Baolong Xie
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology , Tianjin University , Tianjin 300354 , China
- Institute of Tianjin Seawater Desalination and Multipurpose Utilization, State Oceanic Administration (SOA) , Tianjin 300192 , China
| | - Yan Sun
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology , Tianjin University , Tianjin 300354 , China
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30
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Sahoo BR, Genjo T, Cox SJ, Stoddard AK, Anantharamaiah GM, Fierke C, Ramamoorthy A. Nanodisc-Forming Scaffold Protein Promoted Retardation of Amyloid-Beta Aggregation. J Mol Biol 2018; 430:4230-4244. [PMID: 30170005 DOI: 10.1016/j.jmb.2018.08.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/23/2018] [Accepted: 08/16/2018] [Indexed: 10/28/2022]
Abstract
Peptidic nanodiscs are useful membrane mimetic tools for structural and functional studies of membrane proteins, and membrane interacting peptides including amyloids. Here, we demonstrate anti-amyloidogenic activities of a nanodisc-forming 18-residue peptide (denoted as 4F), both in lipid-bound and lipid-free states by using Alzheimer's amyloid-beta (Aβ40) peptide as an example. Fluorescence-based amyloid fibrillation kinetic assays showed a significant delay in Aβ40 amyloid aggregation by the 4F peptide. In addition, 4F-encased lipid nanodiscs, at an optimal concentration of 4F (>20 μM) and nanodisc size (<10 nm), significantly affect amyloid fibrillation. A comparison of experimental results obtained from nanodiscs with that obtained from liposomes revealed a substantial inhibitory efficacy of 4F-lipid nanodiscs against Aβ40 aggregation and were also found to be suitable to trap Aβ40 intermediates. A combination of atomistic molecular dynamics simulations with NMR and circular dichroism experimental results exhibited a substantial change in Aβ40 conformation upon 4F binding through electrostatic and π-π interactions. Specifically, the 4F peptide was found to interfere with the central β-sheet-forming residues of Aβ40 through substantial hydrogen, π-π, and π-alkyl interactions. Fluorescence experiments and coarse-grained molecular dynamics simulations showed the formation of a ternary complex, where Aβ40 binds to the proximity of peptidic belt and membrane surface that deaccelerate amyloid fibrillation. Electron microscopy images revealed short and thick amyloid fibers of Aβ40 formed in the presence of 4F or 4F-lipid nanodsics. These findings could aid in the development of amyloid inhibitors as well as in stabilizing Aβ40 intermediates for high-resolution structural and neurobiological studies.
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Affiliation(s)
- Bikash Ranjan Sahoo
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA; Biophysics Program, University of Michigan, Ann Arbor, MI 48109-1055, USA
| | - Takuya Genjo
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA; Biophysics Program, University of Michigan, Ann Arbor, MI 48109-1055, USA
| | - Sarah J Cox
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA
| | - Andrea K Stoddard
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA
| | | | - Carol Fierke
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA; Department of Chemistry, University of Texas A&M, College Station, TX 77843-3255, USA
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA; Biophysics Program, University of Michigan, Ann Arbor, MI 48109-1055, USA.
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31
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Khan MV, Zakariya SM, Khan RH. Protein folding, misfolding and aggregation: A tale of constructive to destructive assembly. Int J Biol Macromol 2018; 112:217-229. [DOI: 10.1016/j.ijbiomac.2018.01.099] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 01/04/2018] [Accepted: 01/14/2018] [Indexed: 12/20/2022]
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Amyloid fibrillation of an intrinsically disordered plant phloem protein AtPP16-1 under acidic condition. Biophys Chem 2018; 237:1-8. [PMID: 29605501 DOI: 10.1016/j.bpc.2018.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/22/2018] [Accepted: 03/22/2018] [Indexed: 12/25/2022]
Abstract
Arabidopsis thaliana Phloem Protein 16-1 (AtPP16-1) is a 156-residue intrinsically disordered nucleic acid binding protein which is putatively involved in long-distance systemic transport of RNA to budding regions in plants. Dimerization or oligomerization of the protein at pH higher than about 4.1 leaves no apolar surface exposed for interaction with the dye 8-Anilinonaphthalene-1-sulfonate (ANS). The most stable monomeric state is found near pH 4 where the structure of the protein is determined to have three short β-strands and a single α-helix. By surveying the pH-dependent propensity of fibrillation we find the protein enters the amyloidogenic state at pH 2, 60 °C. The reaction product is not amorphous aggregate, but simple amyloid fibrils with sparse or no branching. The mean diameters of the fibril population scaled from AFM images are 13.2 and 21.2 nm for precursor aggregates (PA) and proto- or elongated fibrils, respectively. These values are somewhat larger than the fibril diameters generally cited, and the reason could be larger lateral association for both PA and protofibrils. The protein AtPP16-1 is strictly pH-selective in terms of its structure and stability, and the solution structure is known at pH 4. Under the conditions of pH 2 used here for fibrillation, the protein retains substantial secondary structure. Even if the pH and temperature conditions used for fibrillation are hardly physiological, there is a finite possibility that some aggregation of AtPP16-1 would occur in vivo, as the case of transglutaminase aggregates in the chloroplast of transplastomic plants, for example. The pH related problem has been discussed in detail, but the questions emanating are: do phloem proteins fibrillate in vivo, and if so what implication fibrillation has for plant physiology?
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33
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Jiang Z, Dong X, Sun Y. Charge effects of self-assembled chitosan-hyaluronic acid nanoparticles on inhibiting amyloid β-protein aggregation. Carbohydr Res 2018; 461:11-18. [PMID: 29549749 DOI: 10.1016/j.carres.2018.03.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 02/14/2018] [Accepted: 03/04/2018] [Indexed: 12/26/2022]
Abstract
Amyloid β-protein (Aβ) aggregation is crucial for the pathogenesis of Alzheimer's disease, and surface charge of nanoparticles (NPs) has been recognized as an important factor influencing Aβ aggregation. Herein, we report a systematic study on the issue with a series of self-assembled chitosan-hyaluronic acid composite (CH) NPs of different surface charges (CH1 to CH7, zeta potentials from +38 to -35 mV). Both the positive and negative CH NPs inhibited Aβ aggregation and the inhibitory effect increased with increasing the surface charges density. Circular dichroism spectroscopy and atomic force microscopy revealed the difference in their working mechanisms. Studies at different pH values further confirmed the importance of electrostatic interactions in Aβ aggregation and presented that the effects of CH NPs changed due to the change of Aβ charge property with pH. This work has thus provided new insight into the surface charge effects on Aβ aggregation.
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Affiliation(s)
- Zhiqiang Jiang
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
| | - Xiaoyan Dong
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China.
| | - Yan Sun
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
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34
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Chung YJ, Kim K, Lee BI, Park CB. Carbon Nanodot-Sensitized Modulation of Alzheimer's β-Amyloid Self-Assembly, Disassembly, and Toxicity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1700983. [PMID: 28714246 DOI: 10.1002/smll.201700983] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Revised: 06/02/2017] [Indexed: 05/28/2023]
Abstract
The self-assembly of amyloidogenic peptides into β-sheet-rich aggregates is a general feature of many neurodegenerative diseases, including Alzheimer's disease, which signifies the need for the effective attenuation of amyloid aggregation toward alleviating amyloid-associated neurotoxicity. This study reports that photoluminescent carbon nanodots (CDs) can effectively suppress Alzheimer's β-amyloid (Aβ) self-assembly and function as a β-sheet breaker disintegrating preformed Aβ aggregates. This study synthesizes CDs using ammonium citrate through one-pot hydrothermal treatment and passivates their surface with branched polyethylenimine (bPEI). The bPEI-coated CDs (bPEI@CDs) exhibit hydrophilic and cationic surface characteristics, which interact with the negatively charged residues of Aβ peptides, suppressing the aggregation of Aβ peptides. Under light illumination, bPEI@CDs display a more pronounced effect on Aβ aggregation and on the dissociation of β-sheet-rich assemblies through the generation of reactive oxygen species from photoactivated bPEI@CDs. The light-triggered attenuation effect of Aβ aggregation using a series of experiments, including photochemical and microscopic analysis, is verified. Furthermore, the cell viability test confirms the ability of photoactivated bPEI@CDs for the suppression of Aβ-mediated cytotoxicity, indicating bPEI@CDs' potency as an effective anti-Aβ neurotoxin agent.
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Affiliation(s)
- You Jung Chung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Kayoung Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Byung Il Lee
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Chan Beum Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
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35
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Risør MW, Juhl DW, Bjerring M, Mathiesen J, Enghild JJ, Nielsen NC, Otzen DE. Critical Influence of Cosolutes and Surfaces on the Assembly of Serpin-Derived Amyloid Fibrils. Biophys J 2017; 113:580-596. [PMID: 28793213 DOI: 10.1016/j.bpj.2017.06.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 06/11/2017] [Accepted: 06/12/2017] [Indexed: 12/22/2022] Open
Abstract
Many proteins and peptides self-associate into highly ordered and structurally similar amyloid cross-β aggregates. This fibrillation is critically dependent on properties of the protein and the surrounding environment that alter kinetic and thermodynamic equilibria. Here, we report on dominating surface and solution effects on the fibrillogenic behavior and amyloid assembly of the C-36 peptide, a circulating bioactive peptide from the α1-antitrypsin serine protease inhibitor. C-36 converts from an unstructured peptide to mature amyloid twisted-ribbon fibrils over a few hours when incubated on polystyrene plates under physiological conditions through a pathway dominated by surface-enhanced nucleation. In contrast, in plates with nonbinding surfaces, slow bulk nucleation takes precedence over surface catalysis and leads to fibrillar polymorphism. Fibrillation is strongly ion-sensitive, underlining the interplay between hydrophilic and hydrophobic forces in molecular self-assembly. The addition of exogenous surfaces in the form of silica glass beads and polyanionic heparin molecules potently seeds the amyloid conversion process. In particular, heparin acts as an interacting template that rapidly forces β-sheet aggregation of C-36 to distinct amyloid species within minutes and leads to a more homogeneous fibril population according to solid-state NMR analysis. Heparin's template effect highlights its role in amyloid seeding and homogeneous self-assembly, which applies both in vitro and in vivo, where glycosaminoglycans are strongly associated with amyloid deposits. Our study illustrates the versatile thermodynamic landscape of amyloid formation and highlights how different experimental conditions direct C-36 into distinct macromolecular structures.
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Affiliation(s)
- Michael W Risør
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.
| | - Dennis W Juhl
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Chemistry, Aarhus University, Aarhus, Denmark
| | - Morten Bjerring
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Chemistry, Aarhus University, Aarhus, Denmark
| | | | - Jan J Enghild
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Niels C Nielsen
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Chemistry, Aarhus University, Aarhus, Denmark
| | - Daniel E Otzen
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark; Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.
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36
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Structural insights into functional amyloid inhibition in Gram -ve bacteria. Biochem Soc Trans 2017; 44:1643-1649. [PMID: 27913673 PMCID: PMC5135000 DOI: 10.1042/bst20160245] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 09/20/2016] [Accepted: 09/22/2016] [Indexed: 11/17/2022]
Abstract
Amyloids are proteinaceous aggregates known for their role in debilitating degenerative diseases involving protein dysfunction. Many forms of functional amyloid are also produced in nature and often these systems require careful control of their assembly to avoid the potentially toxic effects. The best-characterised functional amyloid system is the bacterial curli system. Three natural inhibitors of bacterial curli amyloid have been identified and recently characterised structurally. Here, we compare common structural features of CsgC, CsgE and CsgH and discuss the potential implications for general inhibition of amyloid.
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37
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Sekar G, Florance I, Sivakumar A, Mukherjee A, Chandrasekaran N. Role of PAMAM-OH dendrimers against the fibrillation pathway of biomolecules. Int J Biol Macromol 2016; 93:1007-1018. [PMID: 27651276 DOI: 10.1016/j.ijbiomac.2016.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 08/31/2016] [Accepted: 09/01/2016] [Indexed: 12/20/2022]
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38
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Streich C, Akkari L, Decker C, Bormann J, Rehbock C, Müller-Schiffmann A, Niemeyer FC, Nagel-Steger L, Willbold D, Sacca B, Korth C, Schrader T, Barcikowski S. Characterizing the Effect of Multivalent Conjugates Composed of Aβ-Specific Ligands and Metal Nanoparticles on Neurotoxic Fibrillar Aggregation. ACS NANO 2016; 10:7582-7597. [PMID: 27404114 DOI: 10.1021/acsnano.6b02627] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Therapeutically active small molecules represent promising nonimmunogenic alternatives to antibodies for specifically targeting disease-relevant receptors. However, a potential drawback compared to antibody-antigen interactions may be the lower affinity of small molecules toward receptors. Here, we overcome this low-affinity problem by coating the surface of nanoparticles (NPs) with multiple ligands. Specifically, we explored the use of gold and platinum nanoparticles to increase the binding affinity of Aβ-specific small molecules to inhibit Aβ peptide aggregation into fibrils in vitro. The interactions of bare NPs, free ligands, and NP-bound ligands with Aβ are comprehensively studied via physicochemical methods (spectroscopy, microscopy, immunologic tests) and cell assays. Reduction of thioflavin T fluorescence, as an indicator for β-sheet content, and inhibition of cellular Aβ excretion are even more effective with NP-bound ligands than with the free ligands. The results from this study may have implications in the development of therapeutics for treating Alzheimer's disease.
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Affiliation(s)
- Carmen Streich
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
| | - Laura Akkari
- Institute for Organic Chemistry, University of Duisburg-Essen , 45117 Essen, Germany
| | - Christina Decker
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
| | - Jenny Bormann
- Chemical Biology, Zentrum für Medizinische Biotechnologie (ZMB), Fakultät für Biologie, Universtität Duisburg-Essen , 45117 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
| | | | | | - Luitgard Nagel-Steger
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Research Centre Jülich , 52425 Jülich, Germany
| | - Dieter Willbold
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Research Centre Jülich , 52425 Jülich, Germany
| | - Barbara Sacca
- Bionanotechnology, Zentrum für Medizinische Biotechnologie (ZMB), Fakultät für Biologie, University of Duisburg-Essen , 45117 Essen, Germany
| | - Carsten Korth
- Department Neuropathology, University of Düsseldorf Medical School , 40225 Düsseldorf, Germany
| | - Thomas Schrader
- Institute for Organic Chemistry, University of Duisburg-Essen , 45117 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
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39
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Negatively charged hydrophobic nanoparticles inhibit amyloid β-protein fibrillation: The presence of an optimal charge density. REACT FUNCT POLYM 2016. [DOI: 10.1016/j.reactfunctpolym.2016.04.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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40
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Funtan S, Evgrafova Z, Adler J, Huster D, Binder WH. Amyloid Beta Aggregation in the Presence of Temperature-Sensitive Polymers. Polymers (Basel) 2016; 8:polym8050178. [PMID: 30979271 PMCID: PMC6432434 DOI: 10.3390/polym8050178] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 12/20/2022] Open
Abstract
The formation of amyloid fibrils is considered to be one of the main causes for many neurodegenerative diseases, such as Alzheimer’s, Parkinson’s or Huntington’s disease. Current knowledge suggests that amyloid-aggregation represents a nucleation-dependent aggregation process in vitro, where a sigmoidal growth phase follows an induction period. Here, we studied the fibrillation of amyloid β 1-40 (Aβ40) in the presence of thermoresponsive polymers, expected to alter the Aβ40 fibrillation kinetics due to their lower critical solution behavior. To probe the influence of molecular weight and the end groups of the polymer on its lower critical solution temperature (LCST), also considering its concentration dependence in the presence of buffer-salts needed for the aggregation studies of the amyloids, poly(oxazolines) (POx) with LCSTs ranging from 14.2–49.8 °C and poly(methoxy di(ethylene glycol)acrylates) with LCSTs ranging from 34.4–52.7 °C were synthesized. The two different polymers allowed the comparison of the influence of different molecular structures onto the fibrillation process. Mixtures of Aβ40 with these polymers in varying concentrations were studied via time-dependent measurements of the thioflavin T (ThT) fluorescence. The studies revealed that amyloid fibrillation was accelerated in, accompanied by an extension of the lag phase of Aβ40 fibrillation from 18.3 h in the absence to 19.3 h in the presence of the poly(methoxy di(ethylene glycol)acrylate) (3600 g/mol).
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Affiliation(s)
- Sebastian Funtan
- Faculty of Natural Science II, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120 Halle (Saale), Germany.
| | - Zhanna Evgrafova
- Faculty of Natural Science II, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120 Halle (Saale), Germany.
| | - Juliane Adler
- Institute for Medical Physics and Biophysics, Leipzig University, Härtelstraße 16-18, D-04107 Leipzig, Germany.
| | - Daniel Huster
- Institute for Medical Physics and Biophysics, Leipzig University, Härtelstraße 16-18, D-04107 Leipzig, Germany.
| | - Wolfgang H Binder
- Faculty of Natural Science II, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120 Halle (Saale), Germany.
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41
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Taylor JD, Hawthorne WJ, Lo J, Dear A, Jain N, Meisl G, Andreasen M, Fletcher C, Koch M, Darvill N, Scull N, Escalera-Maurer A, Sefer L, Wenman R, Lambert S, Jean J, Xu Y, Turner B, Kazarian SG, Chapman MR, Bubeck D, de Simone A, Knowles TPJ, Matthews SJ. Electrostatically-guided inhibition of Curli amyloid nucleation by the CsgC-like family of chaperones. Sci Rep 2016; 6:24656. [PMID: 27098162 PMCID: PMC4838910 DOI: 10.1038/srep24656] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 03/29/2016] [Indexed: 11/16/2022] Open
Abstract
Polypeptide aggregation into amyloid is linked with several debilitating human diseases. Despite the inherent risk of aggregation-induced cytotoxicity, bacteria control the export of amyloid-prone subunits and assemble adhesive amyloid fibres during biofilm formation. An Escherichia protein, CsgC potently inhibits amyloid formation of curli amyloid proteins. Here we unlock its mechanism of action, and show that CsgC strongly inhibits primary nucleation via electrostatically-guided molecular encounters, which expands the conformational distribution of disordered curli subunits. This delays the formation of higher order intermediates and maintains amyloidogenic subunits in a secretion-competent form. New structural insight also reveal that CsgC is part of diverse family of bacterial amyloid inhibitors. Curli assembly is therefore not only arrested in the periplasm, but the preservation of conformational flexibility also enables efficient secretion to the cell surface. Understanding how bacteria safely handle amyloidogenic polypeptides contribute towards efforts to control aggregation in disease-causing amyloids and amyloid-based biotechnological applications.
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Affiliation(s)
- Jonathan D Taylor
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | | | - Joanne Lo
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Alexander Dear
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Neha Jain
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Georg Meisl
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Maria Andreasen
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Catherine Fletcher
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Marion Koch
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Nicholas Darvill
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Nicola Scull
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | | | - Lea Sefer
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Rosemary Wenman
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Sebastian Lambert
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Jisoo Jean
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Yingqi Xu
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Benjamin Turner
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Sergei G Kazarian
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Matthew R Chapman
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Doryen Bubeck
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Alfonso de Simone
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Steve J Matthews
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
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42
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Selective amyloid β oligomer assay based on abasic site-containing molecular beacon and enzyme-free amplification. Biosens Bioelectron 2016; 78:206-212. [DOI: 10.1016/j.bios.2015.11.048] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/31/2015] [Accepted: 11/15/2015] [Indexed: 12/21/2022]
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43
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Nasir I, Linse S, Cabaleiro-Lago C. Fluorescent filter-trap assay for amyloid fibril formation kinetics in complex solutions. ACS Chem Neurosci 2015; 6:1436-44. [PMID: 25946560 PMCID: PMC4599436 DOI: 10.1021/acschemneuro.5b00104] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Indexed: 12/15/2022] Open
Abstract
Amyloid fibrils are the most distinct components of the plaques associated with various neurodegenerative diseases. Kinetic studies of amyloid fibril formation shed light on the microscopic mechanisms that underlie this process as well as the contributions of internal and external factors to the interplay between different mechanistic steps. Thioflavin T is a widely used noncovalent fluorescent probe for monitoring amyloid fibril formation; however, it may suffer from limitations due to the unspecific interactions between the dye and the additives. Here, we present the results of a filter-trap assay combined with the detection of fluorescently labeled amyloid β (Aβ) peptide. The filter-trap assay separates formed aggregates based on size, and the fluorescent label attached to Aβ allows for their detection. The times of half completion of the process (t1/2) obtained by the filter-trap assay are comparable to values from the ThT assay. High concentrations of human serum albumin (HSA) and carboxyl-modified polystyrene nanoparticles lead to an elevated ThT signal, masking a possible fibril formation event. The filter-trap assay allows fibril formation to be studied in the presence of those substances and shows that Aβ fibril formation is kinetically inhibited by HSA and that the amount of fibrils formed are reduced. In contrast, nanoparticles exhibit a dual-behavior governed by their concentration.
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Affiliation(s)
- Irem Nasir
- Department of Biochemistry
and Structural Biology, Center for Molecular Protein Science, Lund University, P.O.
Box 124, SE 221 00, Lund, Sweden
| | - Sara Linse
- Department of Biochemistry
and Structural Biology, Center for Molecular Protein Science, Lund University, P.O.
Box 124, SE 221 00, Lund, Sweden
| | - Celia Cabaleiro-Lago
- Department of Biochemistry
and Structural Biology, Center for Molecular Protein Science, Lund University, P.O.
Box 124, SE 221 00, Lund, Sweden
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44
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Arosio P, Knowles TPJ, Linse S. On the lag phase in amyloid fibril formation. Phys Chem Chem Phys 2015; 17:7606-18. [PMID: 25719972 PMCID: PMC4498454 DOI: 10.1039/c4cp05563b] [Citation(s) in RCA: 525] [Impact Index Per Article: 58.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 02/03/2015] [Indexed: 12/11/2022]
Abstract
The formation of nanoscale amyloid fibrils from normally soluble peptides and proteins is a common form of self-assembly phenomenon that has fundamental connections with biological functions and human diseases. The kinetics of this process has been widely studied and exhibits on a macroscopic level three characteristic stages: a lag phase, a growth phase and a final plateau regime. The question of which molecular events take place during each one of these phases has been a central element in the quest for a mechanism of amyloid formation. In this review, we discuss the nature and molecular origin of the lag-phase in amyloid formation by making use of tools and concepts from physical chemistry, in particular from chemical reaction kinetics. We discuss how, in macroscopic samples, it has become apparent that the lag-phase is not a waiting time for nuclei to form. Rather, multiple parallel processes exist and typically millions of primary nuclei form during the lag phase from monomers in solution. Thus, the lag-time represents a time that is required for the nuclei that are formed early on in the reaction to grow and proliferate in order to reach an aggregate concentration that is readily detected in bulk assays. In many cases, this proliferation takes place through secondary nucleation, where fibrils may present a catalytic surface for the formation of new aggregates. Fibrils may also break (fragmentation) and thereby provide new ends for elongation. Thus, at least two - primary nucleation and elongation - and in many systems at least four - primary nucleation, elongation, secondary nucleation and fragmentation - microscopic processes occur during the lag phase. Moreover, these same processes occur during all three phases of the macroscopic aggregation process, albeit at different rates as governed by rate constants and by the concentration of reacting species at each point in time.
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Affiliation(s)
- Paolo Arosio
- Chemistry Department , University of Cambridge , Lensfield road , Cambridge , UK
| | - Tuomas P. J. Knowles
- Chemistry Department , University of Cambridge , Lensfield road , Cambridge , UK
| | - Sara Linse
- Department of Biochemistry and Structural Biology , Chemical Centre , Lund University , P. O. Box 124 , SE221 00 Lund , Sweden .
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45
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Nasica-Labouze J, Nguyen PH, Sterpone F, Berthoumieu O, Buchete NV, Coté S, De Simone A, Doig AJ, Faller P, Garcia A, Laio A, Li MS, Melchionna S, Mousseau N, Mu Y, Paravastu A, Pasquali S, Rosenman DJ, Strodel B, Tarus B, Viles JH, Zhang T, Wang C, Derreumaux P. Amyloid β Protein and Alzheimer's Disease: When Computer Simulations Complement Experimental Studies. Chem Rev 2015; 115:3518-63. [PMID: 25789869 DOI: 10.1021/cr500638n] [Citation(s) in RCA: 478] [Impact Index Per Article: 53.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jessica Nasica-Labouze
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Phuong H Nguyen
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Fabio Sterpone
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Olivia Berthoumieu
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Sébastien Coté
- ∥Département de Physique and Groupe de recherche sur les protéines membranaires (GEPROM), Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3T5, Canada
| | - Alfonso De Simone
- ⊥Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J Doig
- #Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Peter Faller
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Alessandro Laio
- ○The International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy
| | - Mai Suan Li
- ◆Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.,¶Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City, Vietnam
| | - Simone Melchionna
- ⬠Instituto Processi Chimico-Fisici, CNR-IPCF, Consiglio Nazionale delle Ricerche, 00185 Roma, Italy
| | | | - Yuguang Mu
- ▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | - Anant Paravastu
- ⊕National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Samuela Pasquali
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | | | - Birgit Strodel
- △Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Bogdan Tarus
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - John H Viles
- ▼School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Tong Zhang
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | | | - Philippe Derreumaux
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,□Institut Universitaire de France, 75005 Paris, France
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46
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Interaction of amyloid inhibitor proteins with amyloid beta peptides: insight from molecular dynamics simulations. PLoS One 2014; 9:e113041. [PMID: 25422897 PMCID: PMC4244084 DOI: 10.1371/journal.pone.0113041] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 10/18/2014] [Indexed: 11/22/2022] Open
Abstract
Knowledge of the detailed mechanism by which proteins such as human αB- crystallin and human lysozyme inhibit amyloid beta (Aβ) peptide aggregation is crucial for designing treatment for Alzheimer's disease. Thus, unconstrained, atomistic molecular dynamics simulations in explicit solvent have been performed to characterize the Aβ17–42 assembly in presence of the αB-crystallin core domain and of lysozyme. Simulations reveal that both inhibitor proteins compete with inter-peptide interaction by binding to the peptides during the early stage of aggregation, which is consistent with their inhibitory action reported in experiments. However, the Aβ binding dynamics appear different for each inhibitor. The binding between crystallin and the peptide monomer, dominated by electrostatics, is relatively weak and transient due to the heterogeneous amino acid distribution of the inhibitor surface. The crystallin-bound Aβ oligomers are relatively long-lived, as they form more extensive contact surface with the inhibitor protein. In contrast, a high local density of arginines from lysozyme allows strong binding with Aβ peptide monomers, resulting in stable complexes. Our findings not only illustrate, in atomic detail, how the amyloid inhibitory mechanism of human αB-crystallin, a natural chaperone, is different from that of human lysozyme, but also may aid de novo design of amyloid inhibitors.
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47
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Månsson C, Arosio P, Hussein R, Kampinga HH, Hashem RM, Boelens WC, Dobson CM, Knowles TPJ, Linse S, Emanuelsson C. Interaction of the molecular chaperone DNAJB6 with growing amyloid-beta 42 (Aβ42) aggregates leads to sub-stoichiometric inhibition of amyloid formation. J Biol Chem 2014; 289:31066-76. [PMID: 25217638 PMCID: PMC4223311 DOI: 10.1074/jbc.m114.595124] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The human molecular chaperone protein DNAJB6 was recently found to inhibit the formation of amyloid fibrils from polyglutamine peptides associated with neurodegenerative disorders such as Huntington disease. We show in the present study that DNAJB6 also inhibits amyloid formation by an even more aggregation-prone peptide (the amyloid-beta peptide, Aβ42, implicated in Alzheimer disease) in a highly efficient manner. By monitoring fibril formation using Thioflavin T fluorescence and far-UV CD spectroscopy, we have found that the aggregation of Aβ42 is retarded by DNAJB6 in a concentration-dependent manner, extending to very low sub-stoichiometric molar ratios of chaperone to peptide. Quantitative kinetic analysis and immunochemistry studies suggest that the high inhibitory efficiency is due to the interactions of the chaperone with aggregated forms of Aβ42 rather than the monomeric form of the peptide. This interaction prevents the growth of such species to longer fibrils and inhibits the formation of new amyloid fibrils through both primary and secondary nucleation. A low dissociation rate of DNAJB6 from Aβ42 aggregates leads to its incorporation into growing fibrils and hence to its gradual depletion from solution with time. When DNAJB6 is eventually depleted, fibril proliferation takes place, but the inhibitory activity can be prolonged by introducing DNAJB6 at regular intervals during the aggregation reaction. These results reveal the highly efficacious mode of action of this molecular chaperone against protein aggregation, and demonstrate that the role of molecular chaperones can involve interactions with multiple aggregated species leading to the inhibition of both principal nucleation pathways through which aggregates are able to form.
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Affiliation(s)
- Cecilia Månsson
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden
| | - Paolo Arosio
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Rasha Hussein
- Department of Cell Biology, UMCG and RuG, Groningen, The Netherlands, Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, Salah Salem Street, 62511 Beni-Suef, Egypt, and
| | - Harm H Kampinga
- Department of Cell Biology, UMCG and RuG, Groningen, The Netherlands
| | - Reem M Hashem
- Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, Salah Salem Street, 62511 Beni-Suef, Egypt, and
| | - Wilbert C Boelens
- Department of Biomolecular Chemistry, Radboud University Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Christopher M Dobson
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Sara Linse
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden
| | - Cecilia Emanuelsson
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden,
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48
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Rajaram H, Palanivelu MK, Arumugam TV, Rao VM, Shaw PN, McGeary RP, Ross BP. ‘Click’ assembly of glycoclusters and discovery of a trehalose analogue that retards Aβ40 aggregation and inhibits Aβ40-induced neurotoxicity. Bioorg Med Chem Lett 2014; 24:4523-4528. [DOI: 10.1016/j.bmcl.2014.07.077] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 07/25/2014] [Accepted: 07/29/2014] [Indexed: 11/29/2022]
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49
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Abraham JN, Kedracki D, Prado E, Gourmel C, Maroni P, Nardin C. Effect of the Interaction of the amyloid β (1-42) peptide with short single-stranded synthetic nucleotide sequences: morphological characterization of the inhibition of fibrils formation and fibrils disassembly. Biomacromolecules 2014; 15:3253-8. [PMID: 25093956 DOI: 10.1021/bm501004q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The formation of extracellular neuritic plaques in the brain of individuals who suffered from Alzheimer's disease (AD) is a major pathological hallmark. These plaques consist of filamentous aggregates of the amyloid beta (1-42) (Aβ42) proteins. Prevention or reduction of the formation of these fibrils is foreseen as a potential therapeutic approach. In this context, we investigated the interactions between the Aβ42 protein and polyions, in particular short single stranded synthetic nucleotide sequences. The experimental outcomes reported herein provide evidence of the inhibition of amyloid fibril genesis as well as disassembly of existing fibers through electrostatic interaction between the Aβ42 protein and the polyions. Since the polyions and the Aβ42 protein are oppositely charged, the formation of (micellar) inter polyelectrolyte complexes (IPECs) is likely to occur. Since the abnormal deposition of amyloid fibers is an archetype of AD, the outcomes of these investigations, supported by atomic force microscopy imaging in the dry and liquid states, as well as circular dichroism and Fourier transform infrared spectroscopy, are of high interest for the development of future strategies to cure a disease that concerns an ever aging population.
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Affiliation(s)
- Jancy Nixon Abraham
- Faculty of Sciences, Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest Ansermet 30, CH-1211, Geneva 4, Switzerland
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50
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Assarsson A, Linse S, Cabaleiro-Lago C. Effects of polyamino acids and polyelectrolytes on amyloid β fibril formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8812-8. [PMID: 24978100 PMCID: PMC4191606 DOI: 10.1021/la501414j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The fibril formation of the neurodegenerative peptide amyloid β (Aβ42) is sensitive to solution conditions, and several proteins and peptides have been found to retard the process. Aβ42 fibril formation was followed with ThT fluorescence in the presence of polyamino acids (poly-glutamic acid, poly-lysine, and poly-threonine) and other polymers (poly(acrylic acid), poly(ethylenimine), and poly(diallyldimethylammonium chloride). An accelerating effect on the Aβ42 aggregation process is observed from all positively charged polymers, while no effect is seen from the negative or neutral polymers. The accelerating effect is dependent on the concentration of positive polymer in a highly reproducible manner. Acceleration is observed from a 1:500 polymer to Aβ42 weight ratio and up. Polyamino acids and the other polymers exert quantitatively the same effect at the same concentrations based on weight. Fibrils are formed in all cases as verified by transmission electron microscopy. The concentrations of polymers required for acceleration are too low to affect the Aβ42 aggregation process through increased ionic strength or molecular crowding effects. Instead, the acceleration seems to arise from the locally increased Aβ42 concentration near the polymers, which favors association and affects the electrostatic environment of the peptide.
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