51
|
Biomimetic spinning of artificial spider silk from a chimeric minispidroin. Nat Chem Biol 2017; 13:262-264. [PMID: 28068309 DOI: 10.1038/nchembio.2269] [Citation(s) in RCA: 161] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/25/2016] [Indexed: 11/08/2022]
Abstract
Herein we present a chimeric recombinant spider silk protein (spidroin) whose aqueous solubility equals that of native spider silk dope and a spinning device that is based solely on aqueous buffers, shear forces and lowered pH. The process recapitulates the complex molecular mechanisms that dictate native spider silk spinning and is highly efficient; spidroin from one liter of bacterial shake-flask culture is enough to spin a kilometer of the hitherto toughest as-spun artificial spider silk fiber.
Collapse
|
52
|
Misra PK, Meher J, Maharana S. Investigation on the gelatin-surfactant interaction and physiochemical characteristics of the mixture. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.10.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
53
|
Jean L, Lee CF, Hodder P, Hawkins N, Vaux DJ. Dynamics of the formation of a hydrogel by a pathogenic amyloid peptide: islet amyloid polypeptide. Sci Rep 2016; 6:32124. [PMID: 27535008 PMCID: PMC4989184 DOI: 10.1038/srep32124] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 08/02/2016] [Indexed: 11/24/2022] Open
Abstract
Many chronic degenerative diseases result from aggregation of misfolded polypeptides to form amyloids. Many amyloidogenic polypeptides are surfactants and their assembly can be catalysed by hydrophobic-hydrophilic interfaces (an air-water interface in-vitro or membranes in-vivo). We recently demonstrated the specificity of surface-induced amyloidogenesis but the mechanisms of amyloidogenesis and more specifically of adsorption at hydrophobic-hydrophilic interfaces remain poorly understood. Thus, it is critical to determine how amyloidogenic polypeptides behave at interfaces. Here we used surface tensiometry, rheology and electron microscopy to demonstrate the complex dynamics of gelation by full-length human islet amyloid polypeptide (involved in type II diabetes) both in the bulk solution and at hydrophobic-hydrophilic interfaces (air-water interface and phospholipids). We show that the hydrogel consists of a 3D supramolecular network of fibrils. We also assessed the role of solvation and dissected the evolution over time of the assembly processes. Amyloid gelation could have important pathological consequences for membrane integrity and cellular functions.
Collapse
Affiliation(s)
- Létitia Jean
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - Chiu Fan Lee
- Department of Bioengineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | | | - Nick Hawkins
- Department of Zoology, University of Oxford, Oxford OX1 3PS, UK
| | - David J. Vaux
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| |
Collapse
|
54
|
Ivnitski D, Amit M, Silberbush O, Atsmon-Raz Y, Nanda J, Cohen-Luria R, Miller Y, Ashkenasy G, Ashkenasy N. The Strong Influence of Structure Polymorphism on the Conductivity of Peptide Fibrils. Angew Chem Int Ed Engl 2016; 55:9988-92. [DOI: 10.1002/anie.201604833] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Denis Ivnitski
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Moran Amit
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Ohad Silberbush
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Yoav Atsmon-Raz
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- Department of Biological Science; University of Calgary, Center of Molecular Simulation; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Jayanta Nanda
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Rivka Cohen-Luria
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Yifat Miller
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Gonen Ashkenasy
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Nurit Ashkenasy
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| |
Collapse
|
55
|
Ivnitski D, Amit M, Silberbush O, Atsmon-Raz Y, Nanda J, Cohen-Luria R, Miller Y, Ashkenasy G, Ashkenasy N. The Strong Influence of Structure Polymorphism on the Conductivity of Peptide Fibrils. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604833] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Denis Ivnitski
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Moran Amit
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Ohad Silberbush
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Yoav Atsmon-Raz
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- Department of Biological Science; University of Calgary, Center of Molecular Simulation; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Jayanta Nanda
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Rivka Cohen-Luria
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Yifat Miller
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Gonen Ashkenasy
- Department of Chemistry; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| | - Nurit Ashkenasy
- Department of Materials Engineering; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
- The Ilse Katz Institute for Nanoscale Science and Technology; Ben-Gurion University of the Negev; Beer-Sheva 84105 Israel
| |
Collapse
|
56
|
Das P, Reches M. Single-stranded DNA detection by solvent-induced assemblies of a metallo-peptide-based complex. NANOSCALE 2016; 8:9527-36. [PMID: 26730518 DOI: 10.1039/c5nr07714a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
DNA detection is highly important for the sensitive sensing of different pathogenic bacteria and viruses. The major challenge is to create a sensor that can selectively detect very small concentrations of DNA without the need for amplification or complicated equipment. Different technologies such as optical, electrochemical and microgravimetric approaches can detect DNA fragments. Here we show, for the first time, the use of self-assembled nanostructures generated by a metallo-peptide as an optical sensing platform for DNA detection. The system can selectively detect single stranded DNA fragments by fluorescence measurements as it can discriminate even one base mismatch and can perform in the presence of other interfering proteins. This system may be useful in lab-on-a-chip applications.
Collapse
Affiliation(s)
- Priyadip Das
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel. and The Centre for Nanoscience and Nanotechnology. The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Meital Reches
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel. and The Centre for Nanoscience and Nanotechnology. The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| |
Collapse
|
57
|
Nardo L, Re F, Brioschi S, Cazzaniga E, Orlando A, Minniti S, Lamperti M, Gregori M, Cassina V, Brogioli D, Salerno D, Mantegazza F. Fluorimetric detection of the earliest events in amyloid β oligomerization and its inhibition by pharmacologically active liposomes. Biochim Biophys Acta Gen Subj 2016; 1860:746-56. [DOI: 10.1016/j.bbagen.2016.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 12/04/2015] [Accepted: 01/06/2016] [Indexed: 02/05/2023]
|
58
|
Lock LL, Reyes CD, Zhang P, Cui H. Tuning Cellular Uptake of Molecular Probes by Rational Design of Their Assembly into Supramolecular Nanoprobes. J Am Chem Soc 2016; 138:3533-40. [DOI: 10.1021/jacs.6b00073] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Lye Lin Lock
- Department
of Chemical and Biomolecular Engineering, and Institute for NanoBioTechnology, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Claudia D. Reyes
- Department
of Chemical and Biomolecular Engineering, and Institute for NanoBioTechnology, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Pengcheng Zhang
- Department
of Chemical and Biomolecular Engineering, and Institute for NanoBioTechnology, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Honggang Cui
- Department
of Chemical and Biomolecular Engineering, and Institute for NanoBioTechnology, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
- Department
of Oncology and Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, United States
- Center
for Nanomedicine, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, 400 North Broadway, Baltimore, Maryland 21231, United States
| |
Collapse
|
59
|
Ghorbani-Choghamarani A, Taherinia Z. Synthesis of peptide nanofibers decorated with palladium nanoparticles and its application as an efficient catalyst for the synthesis of sulfides via reaction of aryl halides with thiourea or 2-mercaptobenzothiazole. RSC Adv 2016. [DOI: 10.1039/c6ra02264b] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work supported Pd nanoparticles on a peptide nanofiber (PdNP–PNF) have been preparedviafabrication of self-assembled woven nanofiber from peptide, subsequently immobilization of palladium nanoparticles on this nanostructural compound.
Collapse
|
60
|
Zhao Y, Deng L, Wang J, Xu H, Lu JR. Solvent Controlled Structural Transition of KI4K Self-Assemblies: from Nanotubes to Nanofibrils. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12975-83. [PMID: 26540520 DOI: 10.1021/acs.langmuir.5b02303] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The structural modulation of peptide and protein assemblies under well-controlled conditions is of both fundamental and practical significance. In spite of extensive studies, it remains hugely challenging to tune the self-assembled nanostructures in a controllable manner because the self-assembly processes are dictated by various noncovalent interactions and their interplay. We report here how to manipulate the self-assembly of a designed, symmetric amphiphilic peptide (KI4K) via the solvent-controlled structural transition. Structural transition processes were carefully followed by the combination of transmission electronic microscopy (TEM), atomic force microscopy (AFM), circular dichroism (CD), Fourier transform infrared spectroscopy (FTIR), and small angle neutron scattering (SANS). The results show that the introduction of acetonitrile into water significantly affected the hydrophobic interactions among hydrophobic side chains while imposing little impact on the β-sheet hydrogen bonding between peptide backbones. A structural transition occurred from nanotubes to helical/twisted ribbons and then to thin fibrils with the addition of acetonitrile due to the reduced hydrophobic interactions and the consequent weakening of the lateral stacking between KI4K β-sheets. The increased intermolecular electrostatic repulsions among lysine side chain amino groups had little effect on the lateral stacking of KI4K β-sheets due to the molecular symmetry. Complementary molecular dynamic (MD) simulations also indicated the solvation of acetonitrile molecules into the hydrophobic domains weakening the coherence between the neighboring sheets.
Collapse
Affiliation(s)
- Yurong Zhao
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266580, China
| | - Li Deng
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266580, China
| | - Jiqian Wang
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266580, China
| | - Hai Xu
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266580, China
| | - Jian R Lu
- Biological Physics Group, School of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, United Kingdom
| |
Collapse
|
61
|
Foschi G, Albonetti C, Liscio F, Milita S, Greco P, Biscarini F. Amorphous Aggregation of Amyloid Beta 1-40 Peptide in Confined Space. Chemphyschem 2015; 16:3379-84. [PMID: 26342212 DOI: 10.1002/cphc.201500602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Indexed: 01/02/2023]
Abstract
The amorphous aggregation of Aβ1-40 peptide is addressed by using micromolding in capillaries. Both the morphology and the size of the aggregates are modulated by changing the contact angle of the sub-micrometric channel walls. Upon decreasing the hydrophilicity of the channels, the aggregates change their morphology from small aligned drops to discontinuous lines, thereby keeping their amorphous structure. Aβ1-40 fibrils are observed at high contact angles.
Collapse
Affiliation(s)
- Giulia Foschi
- Scriba Nanotecnologie S. r. L., Via Corticella 183 -, 40128, Bologna, Italy
| | - Cristiano Albonetti
- Istituto per lo Studio dei Materiali Nanostrutturati - ISMN, Consiglio Nazionale delle Ricerche - CNR, Via P. Gobetti 101 -, 40129, Bologna, Italy).
| | - Fabiola Liscio
- Istituto di Microelettronica e Microsistemi - IMM, Consiglio Nazionale delle Ricerche - CNR, Via P. Gobetti 101 -, 40129, Bologna, Italy
| | - Silvia Milita
- Istituto di Microelettronica e Microsistemi - IMM, Consiglio Nazionale delle Ricerche - CNR, Via P. Gobetti 101 -, 40129, Bologna, Italy
| | - Pierpaolo Greco
- Scriba Nanotecnologie S. r. L., Via Corticella 183 -, 40128, Bologna, Italy
| | - Fabio Biscarini
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 183, I-41125, Modena, Italy
| |
Collapse
|
62
|
Korsak M, Kozyreva T. Beta Amyloid Hallmarks: From Intrinsically Disordered Proteins to Alzheimer’s Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 870:401-21. [DOI: 10.1007/978-3-319-20164-1_14] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
63
|
Skerrett R, Pellegrino MP, Casali BT, Taraboanta L, Landreth GE. Combined Liver X Receptor/Peroxisome Proliferator-activated Receptor γ Agonist Treatment Reduces Amyloid β Levels and Improves Behavior in Amyloid Precursor Protein/Presenilin 1 Mice. J Biol Chem 2015; 290:21591-602. [PMID: 26163517 DOI: 10.1074/jbc.m115.652008] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Indexed: 12/12/2022] Open
Abstract
Alzheimer disease (AD) is characterized by the extracellular accumulation of amyloid β (Aβ), which is accompanied by a robust inflammatory response in the brain. Both of these pathogenic processes are regulated by nuclear receptors, including the liver X receptors (LXRs) and peroxisome-proliferator receptor γ (PPARγ). Agonists of LXRs have been demonstrated previously to reduce Aβ levels and improve cognitive deficits in AD mouse models by inducing the transcription and lipidation of apolipoprotein E (apoE). Agonists targeting PPARγ reduce the microglial expression of proinflammatory genes and have also been shown to modulate apoE expression. Here we investigate whether a combination therapy with both LXR and PPARγ agonists results in increased benefits in an AD mouse model. We found that the LXR agonist GW3965 and the PPARγ agonist pioglitazone were individually able to increase the levels of apoE and related genes, decrease the expression of proinflammatory genes, and facilitate Aβ decreases in the hippocampus. Combined treatment with both agonists provoked a further increase in the expression of apoE and a decrease in the soluble and deposited forms of Aβ. The decrease in plaques was associated with increased colocalization between microglia and plaques. In addition, the PPARγ agonist in the combined treatment paradigm was able to counteract the elevation in plasma triglycerides that is a side effect of LXR agonist treatment. These results suggest that combined LXR/PPARγ agonist treatment merits further investigation for the treatment of AD.
Collapse
Affiliation(s)
- Rebecca Skerrett
- From the Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106 and
| | - Mateus P Pellegrino
- the School of Medicine, University of Campinas, Campinas, Sao Paulo 13083-887, Brazil
| | - Brad T Casali
- From the Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106 and
| | - Laura Taraboanta
- From the Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106 and
| | - Gary E Landreth
- From the Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106 and
| |
Collapse
|
64
|
Muñoz G, Urrutia JC, Burgos CF, Silva V, Aguilar F, Sama M, Yeh HH, Opazo C, Aguayo LG. Low concentrations of ethanol protect against synaptotoxicity induced by Aβ in hippocampal neurons. Neurobiol Aging 2015; 36:845-56. [DOI: 10.1016/j.neurobiolaging.2014.10.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 09/23/2014] [Accepted: 10/08/2014] [Indexed: 12/27/2022]
|
65
|
O'Rourke TW, Loya TJ, Head PE, Horton JR, Reines D. Amyloid-like assembly of the low complexity domain of yeast Nab3. Prion 2015; 9:34-47. [PMID: 25611193 DOI: 10.1080/19336896.2014.997618] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Termination of transcription of short non-coding RNAs is carried out in yeast by the Nab3-Nrd1-Sen1 complex. Nab3 and Nrd1 are hnRNP-like proteins that dimerize and bind RNA with sequence specificity. We show here that an essential region of Nab3 that is predicted to be prion-like based upon its sequence bias, formed amyloid-like filaments. A similar region from Nrd1 also assembled into filaments in vitro. The purified Nab3 domain formed a macroscopic gel whose lattice organization was observed by X-ray fiber diffraction. Filaments were resistant to dissociation in anionic detergent, bound the fluorescent dye thioflavin T, and showed a β-sheet rich structure by circular dichroism spectroscopy, similar to human amyloid β which served as a reference amyloid. A version of the Nab3 domain with a mutation that impairs its termination function, also formed fibers as observed by electron microscopy. Using a protein fragment interaction assay, the purified Nab3 domain was seen to interact with itself in living yeast. A similar observation was made for full length Nab3. These results suggest that the Nab3 and Nrd1 RNA-binding proteins can attain a complex polymeric form and raise the possibility that this property is important for organizing their functional state during termination. These findings are congruent with recent work showing that RNA binding proteins with low complexity domains form a dynamic subcellular matrix in which RNA metabolism takes place but can also aberrantly yield pathological aggregated particles.
Collapse
Key Words
- Aβ, amyloid beta
- BSA, bovine serum albumin
- CPEB, cytoplasmic polyadenylation element binding protein
- CTD, carboxy terminal domain
- DHFR, dihydrofolate reductase
- DMSO, dimethyl sulfoxide
- EDTA, ethylenediaminetetraacetic acid
- GFP, green fluorescent protein
- HFIP, hexafluoroisopropanol
- IPTG, isopropyl β-D-1-thiogalactopyranoside
- PCR, polymerase chain reaction
- RNA binding protein
- RRM, RNA recognition motif
- SDD-AGE, semi-denaturing detergent agarose gel electrophoresis
- SDS, sodium dodecyl sulfate
- TEV, tobacco etch virus
- amyloid
- fibril
- hnRNP
- hnRNP, heterogeneous nuclear ribonucleoprotein
- transcription termination
Collapse
Affiliation(s)
- Thomas W O'Rourke
- a Department of Biochemistry ; Emory University School of Medicine ; Atlanta , GA USA
| | | | | | | | | |
Collapse
|
66
|
Yu YY, Zhang L, Sun XY, Li CL, Qiu Y, Sun HP, Tang DQ, Liu YW, Yin XX. A sensitive colorimetric strategy for monitoring cerebral β-amyloid peptides in AD based on dual-functionalized gold nanoplasmonic particles. Chem Commun (Camb) 2015; 51:8880-3. [DOI: 10.1039/c5cc01855b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A sensitive colorimetric probe based on GNPs was designed and applied to Aβ determination.
Collapse
Affiliation(s)
- Yan-yan Yu
- Department of Pharmaceutical Analysis
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
| | - Lin Zhang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| | - Xiao-yu Sun
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| | - Cheng-lin Li
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| | - Yu Qiu
- Department of Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| | - Hao-peng Sun
- Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- P. R. China
| | - Dao-quan Tang
- Department of Pharmaceutical Analysis
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
| | - Yao-wu Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| | - Xiao-xing Yin
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy
- Xuzhou Medical College
- Xuzhou 221004
- P. R. China
| |
Collapse
|
67
|
Miyazaki M, Nakamura T, Wohlgemuth M, Mitrić R, Dopfer O, Fujii M. Single water solvation dynamics in the 4-aminobenzonitrile–water cluster cation revealed by picosecond time-resolved infrared spectroscopy. Phys Chem Chem Phys 2015; 17:29969-77. [DOI: 10.1039/c5cp05400a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The excess energy of photoionization can control the time scale of single water solvent orientation dynamics from picoseconds to infinitely long trapping in a local minimum.
Collapse
Affiliation(s)
- Mitsuhiko Miyazaki
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Takashi Nakamura
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Matthias Wohlgemuth
- Institut für Theoretische und Physikalische Chemie
- Julius-Maximilians-Universität Würzburg
- 97070 Würzburg
- Germany
| | - Roland Mitrić
- Institut für Theoretische und Physikalische Chemie
- Julius-Maximilians-Universität Würzburg
- 97070 Würzburg
- Germany
| | - Otto Dopfer
- Institut für Optik und Atomare Physik
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Masaaki Fujii
- Chemical Resources Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| |
Collapse
|
68
|
Laurents DV, Pantoja-Uceda D, López LC, Carrodeguas JA, Mompeán M, Jiménez MÁ, Sancho J. DMSO affects Aβ1–40's conformation and interactions with aggregation inhibitors as revealed by NMR. RSC Adv 2015. [DOI: 10.1039/c5ra12100k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
DMSO alters Abeta's conformation and its recognition by inhibitors.
Collapse
Affiliation(s)
- D. V. Laurents
- Instituto de Química Física “Rocasolano”
- CSIC
- Serrano 119
- Spain
| | | | - L. C. López
- Joint Unit BIFI-IQFR
- CSIC
- BiocomputationUniversidad de Zaragoza
- Zaragoza
- Spain
| | - J. A. Carrodeguas
- Joint Unit BIFI-IQFR
- CSIC
- BiocomputationUniversidad de Zaragoza
- Zaragoza
- Spain
| | - M. Mompeán
- Instituto de Química Física “Rocasolano”
- CSIC
- Serrano 119
- Spain
| | - M. Á. Jiménez
- Instituto de Química Física “Rocasolano”
- CSIC
- Serrano 119
- Spain
| | - J. Sancho
- Joint Unit BIFI-IQFR
- CSIC
- BiocomputationUniversidad de Zaragoza
- Zaragoza
- Spain
| |
Collapse
|
69
|
Kaur M, Healy J, Vasudevamurthy M, Lassé M, Puskar L, Tobin MJ, Valery C, Gerrard JA, Sasso L. Stability and cytotoxicity of crystallin amyloid nanofibrils. NANOSCALE 2014; 6:13169-78. [PMID: 25255060 DOI: 10.1039/c4nr04624b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Previous work has identified crystallin proteins extracted from fish eye lenses as a cheap and readily available source for the self-assembly of amyloid nanofibrils. However, before exploring potential applications, the biophysical aspects and safety of this bionanomaterial need to be assessed so as to ensure that it can be effectively and safely used. In this study, crude crystallin amyloid fibrils are shown to be stable across a wide pH range, in a number of industrially relevant solvents, at both low and high temperatures, and in the presence of proteases. Crystallin nanofibrils were compared to well characterised insulin and whey protein fibrils using Thioflavin T assays and TEM imaging. Cell cytotoxicity assays suggest no adverse impact of both mature and fragmented crystallin fibrils on cell viability of Hec-1a endometrial cells. An IR microspectroscopy study supports long-term structural integrity of crystallin nanofibrils.
Collapse
Affiliation(s)
- Manmeet Kaur
- Biomolecular Interaction Centre and School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand.
| | | | | | | | | | | | | | | | | |
Collapse
|
70
|
Design of non-aggregating variants of Aβ peptide. Biochem Biophys Res Commun 2014; 453:449-54. [PMID: 25281534 DOI: 10.1016/j.bbrc.2014.09.102] [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: 09/18/2014] [Accepted: 09/23/2014] [Indexed: 11/22/2022]
Abstract
Self association of the amyloid-β (Aβ42) peptide into oligomers, high molecular weight forms, fibrils and ultimately neuritic plaques, has been correlated with progressive cognitive decline in Alzheimer's disease. Thus, insights into the drivers of the aggregation pathway have the capacity to significantly contribute to our understanding of disease mechanism. Functional assays and a three-dimensional crystal structure of the P3 amyloidogenic region 18-41 of Aβ were used to identify residues important in self-association and to design novel non-aggregating variants of the peptide. Biophysical studies (gel filtration, SDS-PAGE, dynamic light scattering, thioflavin T assay, and electron microscopy) demonstrate that in contrast to wild type Aβ these targeted mutations lose the ability to self-associate. Loss of aggregation also correlates with reduced neuronal toxicity. Our results highlight residues and regions of the Aβ peptide important for future targeting agents aimed at the amelioration of Alzheimer's disease.
Collapse
|
71
|
Jose JC, Khatua P, Bansal N, Sengupta N, Bandyopadhyay S. Microscopic Hydration Properties of the Aβ1–42 Peptide Monomer and the Globular Protein Ubiquitin: A Comparative Molecular Dynamics Study. J Phys Chem B 2014; 118:11591-604. [DOI: 10.1021/jp505629q] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jaya C. Jose
- Physical Chemistry
Division, CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pune 411008, India
| | - Prabir Khatua
- Molecular
Modeling
Laboratory, Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Nupur Bansal
- Physical Chemistry
Division, CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pune 411008, India
| | - Neelanjana Sengupta
- Physical Chemistry
Division, CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pune 411008, India
| | - Sanjoy Bandyopadhyay
- Molecular
Modeling
Laboratory, Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| |
Collapse
|
72
|
Yu Y, Zhang L, Li C, Sun X, Tang D, Shi G. A Method for Evaluating the Level of Soluble β-Amyloid(1-40/1-42)in Alzheimer’s Disease Based on the Binding of Gelsolin to β-Amyloid Peptides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
73
|
Yu Y, Zhang L, Li C, Sun X, Tang D, Shi G. A method for evaluating the level of soluble β-amyloid(1-40/1-42) in Alzheimer's disease based on the binding of gelsolin to β-amyloid peptides. Angew Chem Int Ed Engl 2014; 53:12832-5. [PMID: 25244702 DOI: 10.1002/anie.201405001] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/10/2014] [Indexed: 01/27/2023]
Abstract
In the present work, a new electrochemical strategy for the sensitive and specific detection of soluble β-amyloid Aβ(1-40/1-42) peptides in a rat model of Alzheimer's disease (AD) is described. In contrast to previous antibody-based methods, β-amyloid(1-40/1-42) was quantified based on its binding to gelsolin, a secretory protein present in the cerebrospinal fluid (CSF) and plasma. The level of soluble β-amyloid peptides in the CSF and various brain regions were found with this method to be lower in rats with AD than in normal rats.
Collapse
Affiliation(s)
- Yanyan Yu
- Department of Pharmaceutical Analysis, Xuzhou Medical College, Xuzhou 221004 (China); Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical College, Xuzhou 221004 (China)
| | | | | | | | | | | |
Collapse
|
74
|
Yoshiya T, Maruno T, Uemura T, Kubo S, Kiso Y, Sohma Y, Yoshizawa-Kumagaye K, Kobayashi Y, Nishiuchi Y. Non-pretreated O-acyl isopeptide of amyloid β peptide 1-42 is monomeric with a random coil structure but starts to aggregate in a concentration-dependent manner. Bioorg Med Chem Lett 2014; 24:3861-4. [PMID: 25017031 DOI: 10.1016/j.bmcl.2014.06.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 06/17/2014] [Accepted: 06/19/2014] [Indexed: 11/25/2022]
Abstract
An isopeptide of amyloid β peptide 1-42 (isoAβ42) was considered as a non-aggregative precursor molecule for the highly aggregative Aβ42. It has been applied to biological studies after several pretreatments. Here we report that isoAβ42 is monomeric with a random coil structure at 40 μM without any pretreatment. But we also found that isoAβ42 retains a slight aggregative nature, which is significantly weaker than that of the native Aβ42.
Collapse
Affiliation(s)
- Taku Yoshiya
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan.
| | - Takahiro Maruno
- Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Tsuyoshi Uemura
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan
| | - Shigeru Kubo
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan
| | - Yoshiaki Kiso
- Laboratory of Peptide Science, Nagahama Institute of Bio-Science and Technology, Shiga 526-0829, Japan
| | - Youhei Sohma
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | | | - Yuji Kobayashi
- Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Yuji Nishiuchi
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan; Graduate School of Science, Osaka University, Osaka 560-0043, Japan
| |
Collapse
|
75
|
Sant'Anna R, Braga C, Varejão N, Pimenta KM, Graña-Montes R, Alves A, Cortines J, Cordeiro Y, Ventura S, Foguel D. The importance of a gatekeeper residue on the aggregation of transthyretin: implications for transthyretin-related amyloidoses. J Biol Chem 2014; 289:28324-37. [PMID: 25086037 PMCID: PMC4192486 DOI: 10.1074/jbc.m114.563981] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Protein aggregation into β-sheet-enriched amyloid fibrils is associated with an increasing number of human disorders. The adoption of such amyloid conformations seems to constitute a generic property of polypeptide chains. Therefore, during evolution, proteins have adopted negative design strategies to diminish their intrinsic propensity to aggregate, including enrichment of gatekeeper charged residues at the flanks of hydrophobic aggregation-prone segments. Wild type transthyretin (TTR) is responsible for senile systemic amyloidosis, and more than 100 mutations in the TTR gene are involved in familial amyloid polyneuropathy. The TTR 26–57 segment bears many of these aggressive amyloidogenic mutations as well as the binding site for heparin. We demonstrate here that Lys-35 acts as a gatekeeper residue in TTR, strongly decreasing its amyloidogenic potential. This protective effect is sequence-specific because Lys-48 does not affect TTR aggregation. Lys-35 is part of the TTR basic heparin-binding motif. This glycosaminoglycan blocks the protective effect of Lys-35, probably by neutralization of its side chain positive charge. A K35L mutation emulates this effect and results in the rapid self-assembly of the TTR 26–57 region into amyloid fibrils. This mutation does not affect the tetrameric protein stability, but it strongly increases its aggregation propensity. Overall, we illustrate how TTR is yet another amyloidogenic protein exploiting negative design to prevent its massive aggregation, and we show how blockage of conserved protective features by endogenous factors or mutations might result in increased disease susceptibility.
Collapse
Affiliation(s)
- Ricardo Sant'Anna
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural
| | - Carolina Braga
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural
| | - Nathalia Varejão
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural
| | - Karinne M Pimenta
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural
| | - Ricardo Graña-Montes
- the Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Aline Alves
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural
| | - Juliana Cortines
- the Instituto de Microbiologia Professor Paulo de Goés, Universidade Federal do Rio de Janeiro, Rio de Janeiro CEP 21941-590, Brazil and
| | | | - Salvador Ventura
- the Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Debora Foguel
- From the Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural,
| |
Collapse
|
76
|
Gomes LMF, Vieira RP, Jones MR, Wang MCP, Dyrager C, Souza-Fagundes EM, Da Silva JG, Storr T, Beraldo H. 8-Hydroxyquinoline Schiff-base compounds as antioxidants and modulators of copper-mediated Aβ peptide aggregation. J Inorg Biochem 2014; 139:106-16. [PMID: 25019963 DOI: 10.1016/j.jinorgbio.2014.04.011] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 04/15/2014] [Accepted: 04/15/2014] [Indexed: 12/20/2022]
Abstract
One of the hallmarks of Alzheimer's disease (AD) in the brain are amyloid-β (Aβ) plaques, and metal ions such as copper(II) and zinc(II) have been shown to play a role in the aggregation and toxicity of the Aβ peptide, the major constituent of these extracellular aggregates. Metal binding agents can promote the disaggregation of Aβ plaques, and have shown promise as AD therapeutics. Herein, we describe the syntheses and characterization of an acetohydrazone (8-H2QH), a thiosemicarbazone (8-H2QT), and a semicarbazone (8-H2QS) derived from 8-hydroxyquinoline. The three compounds are shown to be neutral at pH7.4, and are potent antioxidants as measured by a Trolox Equivalent Antioxidant Capacity (TEAC) assay. The ligands form complexes with Cu(II), 8-H2QT in a 1:1 metal:ligand ratio, and 8-H2QH and 8-H2QS in a 1:2 metal:ligand ratio. A preliminary aggregation inhibition assay using the Aβ1-40 peptide showed that 8-H2QS and 8-H2QH inhibit peptide aggregation in the presence of Cu(II). Native gel electrophoresis/Western blot and TEM images were obtained to give a more detailed picture of the extent and pathways of Aβ aggregation using the more neurotoxic Aβ1-42 in the presence and absence of Cu(II), 8-H2QH, 8-H2QS and the drug candidate PBT2. An increase in the formation of oligomeric species is evident in the presence of Cu(II). However, in the presence of ligands and Cu(II), the results match those for the peptide alone, suggesting that the ligands function by sequestering Cu(II) and limiting oligomer formation in this assay.
Collapse
Affiliation(s)
- Luiza M F Gomes
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil; Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada
| | - Rafael P Vieira
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil; Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada
| | - Michael R Jones
- Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada
| | - Michael C P Wang
- Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada
| | - Christine Dyrager
- Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada
| | - Elaine M Souza-Fagundes
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
| | - Jeferson G Da Silva
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
| | - Tim Storr
- Department of Chemistry, Simon Fraser University, V5A-1S6 Burnaby, BC, Canada.
| | - Heloisa Beraldo
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil.
| |
Collapse
|
77
|
Abstract
Amyloid formation is a hallmark of protein misfolding diseases (e.g. Type II diabetes mellitus). The energetically unfavourable nucleation step of amyloidogenesis can be accelerated by seeding, during which pre-formed aggregates act as templates for monomer recruitment. Hydrophobic-hydrophilic interfaces [e.g. AWI (air-water interface)] can also catalyse amyloidogenesis due to the surfactant properties of amyloidogenic polypeptides. Using thioflavin T fluorescence and electron microscopy, we demonstrate that the outcome of seeding on human islet amyloid polypeptide amyloidogenesis is dependent upon whether the AWI is present or absent and is dictated by seed type. Seeding significantly inhibits (with AWI) or promotes (without AWI) plateau height compared with seedless controls; with short fibrils being more efficient seeds than their longer counterparts. Moreover, promotion of nucleation by increasing monomer concentrations can only be observed in the absence of an AWI. Using biophysical modelling, we suggest that a possible explanation for our results may reside in lateral interactions between seeds and monomers determining the fibril mass formed in seeded reactions at steady-state. Our results suggest that in vivo hydrophobic-hydrophilic interfaces (e.g. the presence of membranes and their turnover rate) may dictate the outcome of seeding during amyloidogenesis and that factors affecting the size of the pre-aggregate may be important.
Collapse
|
78
|
Álvarez-Ruíz Y, Carrillo-Mora P. Amyloid beta 25–35 impairs reconsolidation of object recognition memory in rats and this effect is prevented by lithium carbonate. Neurosci Lett 2013; 548:79-83. [DOI: 10.1016/j.neulet.2013.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 05/30/2013] [Accepted: 06/02/2013] [Indexed: 10/26/2022]
|
79
|
Ryan TM, Caine J, Mertens HDT, Kirby N, Nigro J, Breheney K, Waddington LJ, Streltsov VA, Curtain C, Masters CL, Roberts BR. Ammonium hydroxide treatment of Aβ produces an aggregate free solution suitable for biophysical and cell culture characterization. PeerJ 2013; 1:e73. [PMID: 23678397 PMCID: PMC3646356 DOI: 10.7717/peerj.73] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 04/22/2013] [Indexed: 11/20/2022] Open
Abstract
Alzheimer's disease is the leading cause of dementia in the elderly. Pathologically it is characterized by the presence of amyloid plaques and neuronal loss within the brain tissue of affected individuals. It is now widely hypothesised that fibrillar structures represent an inert structure. Biophysical and toxicity assays attempting to characterize the formation of both the fibrillar and the intermediate oligomeric structures of Aβ typically involves preparing samples which are largely monomeric; the most common method by which this is achieved is to use the fluorinated organic solvent 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP). Recent evidence has suggested that this method is not 100% effective in producing an aggregate free solution. We show, using dynamic light scattering, size exclusion chromatography and small angle X-ray scattering that this is indeed the case, with HFIP pretreated Aβ peptide solutions displaying an increased proportion of oligomeric and aggregated material and an increased propensity to aggregate. Furthermore we show that an alternative technique, involving treatment with strong alkali results in a much more homogenous solution that is largely monomeric. These techniques for solubilising and controlling the oligomeric state of Aβ are valuable starting points for future biophysical and toxicity assays.
Collapse
Affiliation(s)
- Timothy M Ryan
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne , Parkville, Victoria , Australia
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
80
|
Dimethyl sulfoxide and dimethyl formamide increase lifespan of C. elegans in liquid. Mech Ageing Dev 2013; 134:69-78. [DOI: 10.1016/j.mad.2012.10.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 10/16/2012] [Accepted: 10/26/2012] [Indexed: 11/21/2022]
|
81
|
Lee CF, Bird S, Shaw M, Jean L, Vaux DJ. Combined effects of agitation, macromolecular crowding, and interfaces on amyloidogenesis. J Biol Chem 2012; 287:38006-19. [PMID: 22988239 PMCID: PMC3488071 DOI: 10.1074/jbc.m112.400580] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 09/17/2012] [Indexed: 11/06/2022] Open
Abstract
Amyloid formation and accumulation is a hallmark of protein misfolding diseases and is associated with diverse pathologies including type II diabetes and Alzheimer's disease (AD). In vitro, amyloidogenesis is widely studied in conditions that do not simulate the crowded and viscous in vivo environment. A high volume fraction of most biological fluids is occupied by various macromolecules, a phenomenon known as macromolecular crowding. For some amyloid systems (e.g. α-synuclein) and under shaking condition, the excluded volume effect of macromolecular crowding favors aggregation, whereas increased viscosity reduces the kinetics of these reactions. Amyloidogenesis can also be catalyzed by hydrophobic-hydrophilic interfaces, represented by the air-water interface in vitro and diverse heterogeneous interfaces in vivo (e.g. membranes). In this study, we investigated the effects of two different crowding polymers (dextran and Ficoll) and two different experimental conditions (with and without shaking) on the fibrilization of amyloid-β peptide, a major player in AD pathogenesis. Specifically, we demonstrate that, during macromolecular crowding, viscosity dominates over the excluded volume effect only when the system is spatially non homogeneous (i.e. an air-water interface is present). We also show that the surfactant activity of the crowding agents can critically influence the outcome of macromolecular crowding and that the structure of the amyloid species formed may depend on the polymer used. This suggests that, in vivo, the outcome of amyloidogenesis may be affected by both macromolecular crowding and spatial heterogeneity (e.g. membrane turn-over). More generally, our work suggests that any factors causing changes in crowding may be susceptibility factors in AD.
Collapse
Affiliation(s)
- Chiu Fan Lee
- the Max Planck Institute for the Physics of Complex Systems, Noethnitzerstr. 38, Dresden 01187, Germany, and
| | - Sarah Bird
- the Medical School, Medical Sciences Office, John Radcliffe Hospital, Oxford University Clinical School, Oxford, OX3 9DU, United Kingdom
| | - Michael Shaw
- From the Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Létitia Jean
- From the Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - David J. Vaux
- From the Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| |
Collapse
|
82
|
Hung VWS, Masoom H, Kerman K. Label-free electrochemical detection of Amyloid beta aggregation in the presence of iron, copper and zinc. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.05.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
83
|
Srokowski EM, Woodhouse KA. Development and characterisation of novel cross-linked bio-elastomeric materials. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 19:785-99. [DOI: 10.1163/156856208784522038] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Elizabeth M. Srokowski
- a Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, RM 363, Toronto, ON, Canada M5S 3E5
| | - Kimberly A. Woodhouse
- b Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, RM 363, Toronto, ON, Canada M5S 3E5; Advanced Regenerative Tissue Engineering Centre, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5
| |
Collapse
|
84
|
Jean L, Lee CF, Vaux DJ. Enrichment of amyloidogenesis at an air-water interface. Biophys J 2012; 102:1154-62. [PMID: 22404938 DOI: 10.1016/j.bpj.2012.01.041] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 01/20/2012] [Accepted: 01/24/2012] [Indexed: 11/16/2022] Open
Abstract
The aggregation of proteins or peptides into amyloid fibrils is a hallmark of protein misfolding diseases (e.g., Alzheimer's disease) and is under intense investigation. Many of the experiments performed are in vitro in nature and the samples under study are ordinarily exposed to diverse interfaces, e.g., the container wall and air. This naturally raises the question of how important interfacial effects are to amyloidogenesis. Indeed, it has already been recognized that many amyloid-forming peptides are surface-active. Moreover, it has recently been demonstrated that the presence of a hydrophobic interface can promote amyloid fibrillization, although the underlying mechanism is still unclear. Here, we combine theory, surface property measurements, and amyloid fibrillogenesis assays on islet amyloid polypeptide and amyloid-β peptide to demonstrate why, at experimentally relevant concentrations, the surface activity of the amyloid-forming peptides leads to enriched fibrillization at an air-water interface. Our findings indicate that the key that links these two seemingly different phenomena is the surface-active nature of the amyloid-forming species, which renders the surface concentration much higher than the corresponding critical fibrillar concentration. This subsequently leads to a substantial increase in fibrillization.
Collapse
Affiliation(s)
- Létitia Jean
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | | | | |
Collapse
|
85
|
Abstract
Quasielastic light scattering (QLS) spectroscopy is a noninvasive optical method for studying the dynamic properties of macromolecular solutions. Its most important application is the determination of diffusion coefficients, from which the sizes of particles in solution may be estimated. The technique thus is particularly useful for monitoring assembly (polymerization and aggregation) reactions without the need for removing aliquots from the assembly system or disrupting the assembly process in any other way. We discuss here two of the most important aspects of QLS: (1) measurement of the correlation function of the scattered light intensity and (2) the use of this correlation function to reconstruct the distribution of sizes of the scattering particles. The ability to monitor the temporal evolution of particle size provides a powerful tool for studying protein assembly. We illustrate here how QLS has been applied to elucidate features of the oligomerization and fibrillogenesis of the amyloid β-protein, Aβ, thought to be the causative agent of Alzheimer's disease.
Collapse
Affiliation(s)
- Aleksey Lomakin
- Materials Processing Center, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | | |
Collapse
|
86
|
Debeljuh N, Varghese S, Barrow CJ, Byrne N. Role of Cation in Enhancing the Conversion of the Alzheimer’s Peptide into Amyloid Fibrils Using Protic Ionic Liquids. Aust J Chem 2012. [DOI: 10.1071/ch12316] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We report on the impact of changes in the protic ionic liquid (pIL) cation on the fibrilisation kinetics and the conversion of the Aβ 16–22 from monomers to amyloid fibrils. When we compare the use of primary, secondary, and tertiary amines we find that the primary amine results in the greatest conversion into amyloid fibrils. We show that the pIL is directly interacting with the peptide and this likely drives the difference in conversion and kinetics observed.
Collapse
|
87
|
Lee CYD, Tse W, Smith JD, Landreth GE. Apolipoprotein E promotes β-amyloid trafficking and degradation by modulating microglial cholesterol levels. J Biol Chem 2011; 287:2032-44. [PMID: 22130662 DOI: 10.1074/jbc.m111.295451] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Allelic variation in the apolipoprotein E (APOE) gene is the major risk factor of sporadic Alzheimer disease. ApoE is the primary cholesterol carrier in the brain. Previously, we demonstrated that intracellular degradation of β-amyloid (Aβ) peptides by microglia is dramatically enhanced in the presence of apoE. However, the molecular mechanisms subserving this effect remain unknown. This study reports a mechanistic link between apoE-regulated cholesterol homeostasis and Aβ degradation. We demonstrate that promoting intracellular Aβ degradation by microglia is a common feature of HDL apolipoproteins, including apoE and apoA-I. This effect was not dependent on the direct interaction of apoE and Aβ. Regulation of Aβ degradation was achieved by solely manipulating cellular cholesterol levels. The expression and the activity of Aβ degrading enzymes, however, were not regulated by cholesterol. We observed that reducing cellular cholesterol levels by apoE resulted in faster delivery of Aβ to lysosomes and enhanced degradation. Moreover, apoE facilitated the recycling of Rab7, a small GTPase responsible for recruiting the motor complex to late endosomes/lysosomes. These data indicate that faster endocytic trafficking of Aβ-containing vesicles in the presence of apoE resulted from efficient recycling of Rab7 from lysosomes to early endosomes. Thus, apoE-induced intracellular Aβ degradation is mediated by the cholesterol efflux function of apoE, which lowers cellular cholesterol levels and subsequently facilitates the intracellular trafficking of Aβ to lysosomes for degradation. These findings demonstrate a direct role of cholesterol in the intracellular Aβ degradation.
Collapse
Affiliation(s)
- C Y Daniel Lee
- Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106, USA.
| | | | | | | |
Collapse
|
88
|
Krištofiková Z, Kříž Z, Řípová D, Koča J. Interactions of Amyloid β Peptide 1–40 and Cerebrosterol. Neurochem Res 2011; 37:604-13. [DOI: 10.1007/s11064-011-0650-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 10/31/2011] [Accepted: 11/03/2011] [Indexed: 01/07/2023]
|
89
|
Achuthan S, Chung BJ, Ghosh P, Rangachari V, Vaidya A. A modified Stokes-Einstein equation for Aβ aggregation. BMC Bioinformatics 2011; 12 Suppl 10:S13. [PMID: 22166081 PMCID: PMC3236835 DOI: 10.1186/1471-2105-12-s10-s13] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In all amyloid diseases, protein aggregates have been implicated fully or partly, in the etiology of the disease. Due to their significance in human pathologies, there have been unprecedented efforts towards physiochemical understanding of aggregation and amyloid formation over the last two decades. An important relation from which hydrodynamic radii of the aggregate is routinely measured is the classic Stokes-Einstein equation. Here, we report a modification in the classical Stokes-Einstein equation using a mixture theory approach, in order to accommodate the changes in viscosity of the solvent due to the changes in solute size and shape, to implement a more realistic model for Aβ aggregation involved in Alzheimer's disease. Specifically, we have focused on validating this model in protofibrill lateral association reactions along the aggregation pathway, which has been experimentally well characterized. RESULTS The modified Stokes-Einstein equation incorporates an effective viscosity for the mixture consisting of the macromolecules and solvent where the lateral association reaction occurs. This effective viscosity is modeled as a function of the volume fractions of the different species of molecules. The novelty of our model is that in addition to the volume fractions, it incorporates previously published reports on the dimensions of the protofibrils and their aggregates to formulate a more appropriate shape rather than mere spheres. The net result is that the diffusion coefficient which is inversely proportional to the viscosity of the system is now dependent on the concentration of the different molecules as well as their proper shapes. Comparison with experiments for variations in diffusion coefficients over time reveals very similar trends. CONCLUSIONS We argue that the standard Stokes-Einstein's equation is insufficient to understand the temporal variations in diffusion when trying to understand the aggregation behavior of Aβ42 proteins. Our modifications also involve inclusion of improved shape factors of molecules and more appropriate viscosities. The modification we are reporting is not only useful in Aβ aggregation but also will be important for accurate measurements in all protein aggregation systems.
Collapse
Affiliation(s)
- Srisairam Achuthan
- Department of Mathematical Sciences, Montclair State University, Montclair, NJ 07043, USA
| | | | | | | | | |
Collapse
|
90
|
|
91
|
Chambon C, Wegener N, Gravius A, Danysz W. Behavioural and cellular effects of exogenous amyloid-β peptides in rodents. Behav Brain Res 2011; 225:623-41. [PMID: 21884730 DOI: 10.1016/j.bbr.2011.08.024] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 08/10/2011] [Accepted: 08/16/2011] [Indexed: 12/29/2022]
Abstract
A better understanding of Alzheimer's disease (AD) and the development of disease modifying therapies are some of the biggest challenges of the 21st century. One of the core features of AD are amyloid plaques composed of amyloid-beta (Aβ) peptides. The first hypothesis proposed that cognitive deficits are linked to plaque-development and transgenic mice have been generated to study this link, thereby providing a good model to develop new therapeutic approaches. Since later it was recognised that in AD patients the cognitive deficit is rather correlated to soluble amyloid levels, consequently, a new hypothesis appeared associating the earliest amyloid toxicity to these soluble species. The purpose of this review is to give a summary of behavioural and cellular data obtained after soluble Aβ peptide administration into rodents' brain, thereby showing that this model is a valid tool to investigate AD pathology when no plaques are present. Additionally, this method offers an excellent, efficient model to test compounds which could act at such early stages of the disease.
Collapse
Affiliation(s)
- Caroline Chambon
- In Vivo Pharmacology, Merz Pharmaceuticals GmbH, Eckenheimer Landstrasse 100, D-60318 Frankfurt am Main, Germany.
| | | | | | | |
Collapse
|
92
|
Broersen K, Jonckheere W, Rozenski J, Vandersteen A, Pauwels K, Pastore A, Rousseau F, Schymkowitz J. A standardized and biocompatible preparation of aggregate-free amyloid beta peptide for biophysical and biological studies of Alzheimer's disease. Protein Eng Des Sel 2011; 24:743-50. [DOI: 10.1093/protein/gzr020] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
93
|
Grasso G. The use of mass spectrometry to study amyloid-β peptides. MASS SPECTROMETRY REVIEWS 2011; 30:347-365. [PMID: 21500241 DOI: 10.1002/mas.20281] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2009] [Revised: 11/06/2009] [Accepted: 11/06/2009] [Indexed: 05/30/2023]
Abstract
Amyloid-β peptide (Aβ) varies in size from 39 to 43 amino acids and arises from sequential β- and γ-secretase processing of the amyloid precursor protein. Whereas the non-pathological role for Aβ is yet to be established, there is no disputing that Aβ is now widely regarded as central to the development of Alzheimer's disease (AD). The so named "amyloid cascade hypothesis" states that disease progression is the result of an increased Aβ burden in affected areas of the brain. To elucidate the Aβ role in AD, many analytical approaches have been proposed as suitable tools to investigate not only the total Aβ load but also many other issues that are considered crucial for AD, such as: (i) the aggregation state in which Aβ is present; (ii) its interaction with other species or metals; (iii) its ability to induce oxidative stress; and (iv) its degradative pathways. This review provides an insight into the use of mass spectrometry (MS) in the field of Aβ investigation aimed to assess its role in AD. In particular, the different MS-based approaches applied in vitro and in vivo that can provide detailed information on the above-mentioned issues are reviewed. Moreover, the advantages offered by the MS methods over all the other techniques are highlighted, together with the recent developments and uses of combined analytical approaches to detect and characterize Aβ.
Collapse
Affiliation(s)
- Giuseppe Grasso
- Chemistry Department, Università di Catania, Viale Andrea Doria 6, Catania 95125, Italy.
| |
Collapse
|
94
|
Toksoz S, Mammadov R, Tekinay AB, Guler MO. Electrostatic effects on nanofiber formation of self-assembling peptide amphiphiles. J Colloid Interface Sci 2011; 356:131-7. [DOI: 10.1016/j.jcis.2010.12.076] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Revised: 12/24/2010] [Accepted: 12/27/2010] [Indexed: 11/12/2022]
|
95
|
Paparcone R, Cranford SW, Buehler MJ. Self-folding and aggregation of amyloid nanofibrils. NANOSCALE 2011; 3:1748-1755. [PMID: 21347488 DOI: 10.1039/c0nr00840k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Amyloids are highly organized protein filaments, rich in β-sheet secondary structures that self-assemble to form dense plaques in brain tissues affected by severe neurodegenerative disorders (e.g. Alzheimer's Disease). Identified as natural functional materials in bacteria, in addition to their remarkable mechanical properties, amyloids have also been proposed as a platform for novel biomaterials in nanotechnology applications including nanowires, liquid crystals, scaffolds and thin films. Despite recent progress in understanding amyloid structure and behavior, the latent self-assembly mechanism and the underlying adhesion forces that drive the aggregation process remain poorly understood. On the basis of previous full atomistic simulations, here we report a simple coarse-grain model to analyze the competition between adhesive forces and elastic deformation of amyloid fibrils. We use simple model system to investigate self-assembly mechanisms of fibrils, focused on the formation of self-folded nanorackets and nanorings, and thereby address a critical issue in linking the biochemical (Angstrom) to micrometre scales relevant for larger-scale states of functional amyloid materials. We investigate the effect of varying the interfibril adhesion energy on the structure and stability of self-folded nanorackets and nanorings and demonstrate that these aggregated amyloid fibrils are stable in such states even when the fibril-fibril interaction is relatively weak, given that the constituting amyloid fibril length exceeds a critical fibril length-scale of several hundred nanometres. We further present a simple approach to directly determine the interfibril adhesion strength from geometric measures. In addition to providing insight into the physics of aggregation of amyloid fibrils our model enables the analysis of large-scale amyloid plaques and presents a new method for the estimation and engineering of the adhesive forces responsible of the self-assembly process of amyloid nanostructures, filling a gap that previously existed between full atomistic simulations of primarily ultra-short fibrils and much larger micrometre-scale amyloid aggregates. Via direct simulation of large-scale amyloid aggregates consisting of hundreds of fibrils we demonstrate that the fibril length has a profound impact on their structure and mechanical properties, where the critical fibril length-scale derived from our analysis of self-folded nanorackets and nanorings defines the structure of amyloid aggregates. A multi-scale modeling approach as used here, bridging the scales from Angstroms to micrometres, opens a wide range of possible nanotechnology applications by presenting a holistic framework that balances mechanical properties of individual fibrils, hierarchical self-assembly, and the adhesive forces determining their stability to facilitate the design of de novo amyloid materials.
Collapse
Affiliation(s)
- Raffaella Paparcone
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave. Room 1-235A&B, Cambridge, MA, USA
| | | | | |
Collapse
|
96
|
Debeljuh N, Barrow CJ, Byrne N. The impact of ionic liquids on amyloid fibrilization of Aβ16-22: tuning the rate of fibrilization using a reverse Hofmeister strategy. Phys Chem Chem Phys 2011; 13:16534-6. [DOI: 10.1039/c1cp22256b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
97
|
Ye M, Zhang Y, Li H, Xie M, Hu J. Supramolecular Structures of Amyloid-Related Peptides in an Ambient Water Nanofilm. J Phys Chem B 2010; 114:15759-65. [PMID: 21077660 DOI: 10.1021/jp105501x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ming Ye
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
| | - Hai Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
| | - Muyun Xie
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Hu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
98
|
Harada T, Kuroda R. CD measurements of β-amyloid (1-40) and (1-42) in the condensed phase. Biopolymers 2010; 95:127-34. [DOI: 10.1002/bip.21543] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2010] [Revised: 08/28/2010] [Accepted: 09/07/2010] [Indexed: 11/12/2022]
|
99
|
Paparcone R, Pires MA, Buehler MJ. Mutations Alter the Geometry and Mechanical Properties of Alzheimer’s Aβ(1−40) Amyloid Fibrils. Biochemistry 2010; 49:8967-77. [DOI: 10.1021/bi100953t] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raffaella Paparcone
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-235A&B, Cambridge, Massachusetts 02139-4301
| | - Matthew A. Pires
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-235A&B, Cambridge, Massachusetts 02139-4301
| | - Markus J. Buehler
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-235A&B, Cambridge, Massachusetts 02139-4301
- Center for Computational Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4301
| |
Collapse
|
100
|
Inutan ED, Trimpin S. Laserspray Ionization-Ion Mobility Spectrometry−Mass Spectrometry: Baseline Separation of Isomeric Amyloids without the Use of Solvents Desorbed and Ionized Directly from a Surface. J Proteome Res 2010; 9:6077-81. [DOI: 10.1021/pr1005923] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ellen D. Inutan
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| | - Sarah Trimpin
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202
| |
Collapse
|