1
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Su H, An H, Tan S, Zhai Y, Fu Y, Li T. pH-Dependent Reversible Self-Assembly of β-Lactoglobulin-Derived Reducing Peptides. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 38602372 DOI: 10.1021/acs.jafc.4c00249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Peptide-based self-assembled nanostructures are emerging vehicles for nutrient delivery and interface engineering. The present study screened eight β-lactoglobulin (β-Lg) derived peptides and found that two reducing peptides [EQSLVCQCLV (EV-10) and VCQCLVR (VR-7)] demonstrated pH-dependent reversible fibrilization. EV-10 formed fibrils at pH 2.0 but became unordered aggregates at pH 7.0. VR-7 showed the opposite trend. Both peptides could undergo repetitive transitions between fibrils and unordered aggregates during consecutive pH-cycling. Fibrilization of both peptides was dominated by charges carried by N- and C-terminals. Both fibrils were characterized by a cross-β sheet structure where the β-sheet was arranged in an antiparallel manner. Fe3+ was reduced by Cys and EV-10 (pH 5.0 and 7.0) simultaneously upon mixing. In contrast, EV-10 fibrils released Fe3+ reducing capacity progressively, which were beneficial to long-term protection Fe2+. The EV-10 fibrils remained intact after simulated gastric digestion and finally dissociated after intestinal digestion. The results shed light on the mechanisms of fibrilization of β-Lg derived peptides. This study was beneficial to the rational design of smart pH-responsive materials for drug delivery and antioxidants for nutrients susceptible to oxidation.
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Affiliation(s)
- Huanhuan Su
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Hao An
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Siying Tan
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Yun Zhai
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Yuying Fu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Teng Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
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2
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Stroganova I, Willenberg H, Tente T, Depraz Depland A, Bakels S, Rijs AM. Exploring the Aggregation Propensity of PHF6 Peptide Segments of the Tau Protein Using Ion Mobility Mass Spectrometry Techniques. Anal Chem 2024; 96:5115-5124. [PMID: 38517679 PMCID: PMC10993201 DOI: 10.1021/acs.analchem.3c04974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 03/06/2024] [Accepted: 03/07/2024] [Indexed: 03/24/2024]
Abstract
Peptide and protein aggregation involves the formation of oligomeric species, but the complex interplay between oligomers of different conformations and sizes complicates their structural elucidation. Using ion mobility mass spectrometry (IM-MS), we aim to reveal these early steps of aggregation for the Ac-PHF6-NH2 peptide segment from tau protein, thereby distinguishing between different oligomeric species and gaining an understanding of the aggregation pathway. An important factor that is often neglected, but which can alter the aggregation propensity of peptides, is the terminal capping groups. Here, we demonstrate the use of IM-MS to probe the early stages of aggregate formation of Ac-PHF6-NH2, Ac-PHF6, PHF6-NH2, and uncapped PHF6 peptide segments. The aggregation propensity of the four PHF6 segments is confirmed using thioflavin T fluorescence assays and transmission electron microscopy. A novel approach based on post-IM fragmentation and quadrupole selection on the TIMS-Qq-ToF (trapped ion mobility) spectrometer was developed to enhance oligomer assignment, especially for the higher-order aggregates. This approach pushes the limits of IM identification of isobaric species, whose signatures appear closer to each other with increasing oligomer size, and provides new insights into the interpretation of IM-MS data. In addition, TIMS collision cross section values are compared with traveling wave ion mobility (TWIMS) data to evaluate potential instrumental bias in the trapped ion mobility results. The two IM-MS instrumental platforms are based on different ion mobility principles and have different configurations, thereby providing us with valuable insight into the preservation of weakly bound biomolecular complexes such as peptide aggregates.
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Affiliation(s)
- Iuliia Stroganova
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
- Centre
for Analytical Sciences Amsterdam, Amsterdam 1098 XH, The Netherlands
| | - Hannah Willenberg
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
| | - Thaleia Tente
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
| | - Agathe Depraz Depland
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
- Centre
for Analytical Sciences Amsterdam, Amsterdam 1098 XH, The Netherlands
| | - Sjors Bakels
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
- Centre
for Analytical Sciences Amsterdam, Amsterdam 1098 XH, The Netherlands
| | - Anouk M. Rijs
- Division
of Bioanalytical Chemistry, Department of Chemistry and Pharmaceutical
Sciences, Amsterdam Institute of Molecular and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1105, Amsterdam 1081 HV, The Netherlands
- Centre
for Analytical Sciences Amsterdam, Amsterdam 1098 XH, The Netherlands
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3
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Salmani F, Mohammadi M, Seif R, Khatami SH, Noori S, Tehrani HS, Riazi G, Balalaie S, Moosavi-Movahedi AA, Fard AM, Mahnam K, Keramatinia A, Tafakhori A, Aghamollaii V, Toutounchi AH, Shahmohammadi MR, Karima S. Lysine ε-aminolysis and incorporation of sulfhydryl groups into human brain tau 4R/1N and 306VQIVYK 311 enhances the formation of beta structures and toxicity. Int J Biol Macromol 2024; 263:130223. [PMID: 38365146 DOI: 10.1016/j.ijbiomac.2024.130223] [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: 07/25/2023] [Revised: 02/13/2024] [Accepted: 02/13/2024] [Indexed: 02/18/2024]
Abstract
In the present study, we investigated the effects of N-homocysteine thiolactone (tHcy) modification on expressed and purified tau protein and the synthesized VQIVYK target peptide. The modified constructs were subjected to comprehensive validation using various methodologies, including mass spectrometry. Subsequently, in vivo, in vitro, and in silico characterizations were performed under both reducing and non-reducing conditions, as well as in the presence and absence of heparin as a cofactor. Our results unequivocally confirmed that under reducing conditions and in the presence of heparin, the modified constructs exhibited a greater propensity for aggregation. This enhanced aggregative behavior can be attributed to the disruption of lysine positive charges and the subsequent influence of hydrophobic and p-stacking intermolecular forces. Notably, the modified oligomeric species induced apoptosis in the SH-SY5Y cell line, and this effect was further exacerbated with longer incubation times and higher concentrations of the modifier. These observations suggest a potential mechanism involving reactive oxygen species (ROS). To gain a deeper understanding of the molecular mechanisms underlying the neurotoxic effects, further investigations are warranted. Elucidating these mechanisms will contribute to the development of more effective strategies to counteract aggregation and mitigate neurodegeneration.
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Affiliation(s)
- Farzaneh Salmani
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Marjan Mohammadi
- Student Research Committee, Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Roozbeh Seif
- Student Research Committee, Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyyed Hossein Khatami
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Shokoofeh Noori
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | | | - Gholamhossein Riazi
- Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Saeed Balalaie
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, Tehran, Iran
| | | | | | - Karim Mahnam
- Faculty of Science, Department of Biology, Nanotechnology Research Center, Sharekord University, Sharekord, Iran
| | - Aliasghar Keramatinia
- Department of Community Medicine,Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abbas Tafakhori
- Department of Neurology, School of Medicine, Iranian Center of Neurological Research, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Vajiheh Aghamollaii
- Neurology Department, Roozbeh Hospital, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Alireza Haghbin Toutounchi
- Department of general surgery, Imam Hosein medical and educational center, Shahid Beheshti University of Medical Sciences,Tehran,Iran
| | - Mohammad Reza Shahmohammadi
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Saeed Karima
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran.
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4
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Li X, Wei F, Le X, Wang L, Wang D, Chen C, Xu S, Liao X, Zhao Y. Solvent modulated structural transition of self-assemblies formed by bola-form hexapeptide amphiphiles. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Ccorahua R, Noguchi H, Hayamizu Y. Cosolvents Restrain Self-Assembly of a Fibroin-Like Peptide on Graphite. J Phys Chem B 2021; 125:10893-10899. [PMID: 34559528 DOI: 10.1021/acs.jpcb.1c02594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Controllable self-assembly of peptides on solid surfaces has been investigated for establishing functional bio/solid interfaces. In this work, we study the influence of organic solvents on the self-assembly of a fibroin-like peptide on a graphite surface. The peptide has been designed by mimicking fibroin proteins to have strong hydrogen bonds among peptides enabling their self-assembly. We have employed cosolvents of water and organic solvents with a wide range of dielectric constants to control peptide self-assembly on the surface. Atomic force microscopy has revealed that the peptides self-assemble into highly ordered monolayer-thick linear structures on graphite after incubation in pure water, where the coverage of peptides on the surface is more than 85%. When methanol is mixed, the peptide coverage becomes zero at a threshold concentration of 30% methanol on graphite and 25% methanol on MoS2. The threshold concentration in ethanol, isopropanol, dimethyl sulfoxide, and acetone varies depending on the dielectric constant with restraining self-assembly of the peptides, and particularly low dielectric-constant protic solvents prevent the peptide self-assembly significantly. The observed phenomena are explained by competitive surface adsorption of the organic solvents and peptides and the solvation effect of the peptide assembly.
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Affiliation(s)
- Robert Ccorahua
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - Hironaga Noguchi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - Yuhei Hayamizu
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
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6
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7
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Ribeiro AC, Souza GA, Pereira DH, Cordeiro DS, Miranda RS, Custódio R, Martins TD. Phe-Phe Di-Peptide Nanostructure Self-Assembling Modulated by Luminescent Additives. ACS OMEGA 2019; 4:606-619. [PMID: 31459351 PMCID: PMC6648563 DOI: 10.1021/acsomega.8b02732] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 12/26/2018] [Indexed: 05/17/2023]
Abstract
In this work, supramolecular l-l-diphenylalanine (Phe-Phe) nanostructures were self-assembled in solvents of distinct polarity and in the presence of luminescent additives of distinct conjugation length that physically adhere to the nanostructures to provide growth environments of distinct properties. When the additive is poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene], an electron donor polymer, and solvent is tetrahydrofuran (THF), Phe-Phe vesicle-like structures are obtained, whereas in water and in the presence of a similar additive in structure, poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene], nanotubes are formed. In contrast, when 9-vinyl-carbazole, an electron acceptor additive is used, nanotubes are formed even when THF is the solvent. The same structures are obtained when the additive is the macromolecule poly(vinyl carbazole). The morphologies of these self-assembled structures were observed by scanning electron microscopy, and their photophysical behavior was determined by steady-state fluorescence spectroscopy and time-resolved fluorescence spectroscopy. These data analyzed altogether inform about the formation mechanisms of such structures and about the influence that distinct interactions exert on self-assembling and charge-transfer processes through formation of complexes between the luminescent additives and the Phe-Phe nano- and microstructures.
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Affiliation(s)
- Antonio
C. C. Ribeiro
- Chemistry
Institute, Federal University of Goias, Campus II—Samambaia, P.O. Box 24242, Goiania 74690-970, Brazil
| | - Geovany A. Souza
- Chemistry
Institute, Federal University of Goias, Campus II—Samambaia, P.O. Box 24242, Goiania 74690-970, Brazil
| | - Douglas Henrique Pereira
- Chemistry
Collegiate, Federal University of Tocantins, Campus Gurupi-Badejós, P.O. Box 66, Gurupi 77 402-970, Brazil
| | - Diericon S. Cordeiro
- Chemistry
Institute, Federal University of Goias, Campus II—Samambaia, P.O. Box 24242, Goiania 74690-970, Brazil
| | - Ramon S. Miranda
- Chemistry
Institute, Federal University of Goias, Campus II—Samambaia, P.O. Box 24242, Goiania 74690-970, Brazil
| | - Rogério Custódio
- Institute
of Chemistry, University of Campinas, Barão Geraldo, P.O. Box 6154, Campinas 13083-970, São Paulo, Brazil
| | - Tatiana D. Martins
- Chemistry
Institute, Federal University of Goias, Campus II—Samambaia, P.O. Box 24242, Goiania 74690-970, Brazil
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8
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Stetsenko DA, Apukhtina VS, Chelobanov BP, Palladino P. Removal of acid-labile protecting or anchoring groups in the presence of polyfluorinated alcohol: Application to solid-phase peptide synthesis. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2016. [DOI: 10.1134/s106816201602014x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Sivakama Sundari C, Bikshapathy E, Nagaraj R. Self-assembly of a peptide with a tandem repeat of the Aβ16-22 sequence linked by a β turn-promoting dipeptide sequence. Biopolymers 2015; 104:790-803. [DOI: 10.1002/bip.22753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 09/21/2015] [Accepted: 10/10/2015] [Indexed: 12/31/2022]
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10
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Bhushan B, Luo D, Schricker SR, Sigmund W, Zauscher S. Hierarchical Self-Assembled Peptide Nano-ensembles. HANDBOOK OF NANOMATERIALS PROPERTIES 2014. [PMCID: PMC7123264 DOI: 10.1007/978-3-642-31107-9_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A variety of peptides can be self-assembled, i.e. self-organized spontaneously, into large and complex hierarchical structures, reproducibly by regulating a range of parameters that can be environment driven, process driven, or peptide driven. These supramolecular peptide aggregates yield different shapes and structures like nanofibers, nanotubes, nanobelts, nanowires, nanotapes, and micelles. These peptide nanostructures represent a category of materials that bridge biotechnology and nanotechnology and are found suitable not only for biomedical applications such as tissue engineering and drug delivery but also in nanoelectronics.
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Affiliation(s)
- Bharat Bhushan
- Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics, Ohio State University, Columbus, Ohio USA
| | - Dan Luo
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York USA
| | - Scott R. Schricker
- Division of Restorative, Prosthetic and Primary Care, The Ohio State University, College of Dentistry, Columbus, Ohio USA
| | - Wolfgang Sigmund
- Department of Materials Science and Engineering, University of Florida, Gainesville, Florida USA
| | - Stefan Zauscher
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina USA
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11
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Gillissen MAJ, Koenigs MME, Spiering JJH, Vekemans JAJM, Palmans ARA, Voets IK, Meijer EW. Triple helix formation in amphiphilic discotics: demystifying solvent effects in supramolecular self-assembly. J Am Chem Soc 2013; 136:336-43. [PMID: 24313787 DOI: 10.1021/ja4104183] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A set of chiral, amphiphilic, self-assembling discotic molecules based on the 3,3'-bis(acylamino)-2,2'-bipyridine-substituted benzene-1,3,5-tricarboxamide motif (BiPy-BTA) was prepared. Amphiphilicity was induced into the discotic molecules by an asymmetrical distribution of alkyl and oligo(ethylene oxide) groups in the periphery of the molecules. Small-angle X-ray scattering, cryogenic transmission electron microscopy, and circular dichroism spectroscopy measurements were performed on the discotic amphiphiles in mixtures of water and alcohol at temperatures between 0 °C an 90 °C. The combined results show that these amphiphilic discotic molecules self-assemble into supramolecular fibers consisting of either one or three discotic molecules in the fiber cross-section and that the presence of water induces the bundling of the supramolecular fibers. The rich phase behavior observed for these molecules proves to be intimately connected to the mixing thermodynamics of the water-alcohol mixtures.
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Affiliation(s)
- Martijn A J Gillissen
- Institute of Complex Molecular Systems, Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology , P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
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12
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Rawat A, Nagaraj R. Covalently attached fatty acyl chains alter the aggregation behavior of an amyloidogenic peptide derived from human β(2)-microglobulin. J Pept Sci 2013; 19:770-83. [PMID: 24243599 DOI: 10.1002/psc.2575] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 09/17/2013] [Accepted: 09/23/2013] [Indexed: 12/14/2022]
Abstract
Aggregation of a polypeptide chain into highly ordered amyloid aggregates is a complex process. Various factors, both extrinsic and intrinsic to the polypeptide chain, have been shown to perturb this process, leading to a drastic change in the amyloidogenic behavior, which is reflected in the polymorphism of amyloid aggregates at various levels of self-assembly. In this paper, we have investigated the ability of covalently linked long-chain fatty acids in modulating the self-assembly of an aromatic amino acid-rich highly amyloidogenic sequence derived from the amino acid region 59-71 of human β2-microglobulin by thioflavin T (ThT) fluorescence microscopy, circular dichroism, and fluorescence spectroscopy. Our results indicate that under identical conditions of dissolution and concentration, each peptide enhances the fluorescence of ThT. However, the aggregates are morphologically distinct. For the same peptide, the aggregate morphologies are dependent on peptide concentration. Further, an optimum concentration, which varies with solution ionic strength, is required for the formation of fibrillar aggregates. We show that covalent modification of this amyloidogenic sequence, with long-chain fatty acids, affects the way the higher order amyloid structures assemble from the cross-β units, in fatty acyl chain-dependent and position-dependent manner. Our data indicate that noncovalent interactions leading to amyloid fibril formation can be modulated by the hydrophobicity of covalently attached long-chain fatty acids resulting in self-assembly of the peptide chain to form nonfibrillar aggregates.
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Affiliation(s)
- Anoop Rawat
- CSIR - Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad, 500 007, India
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13
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Palladino P, Stetsenko DA. New TFA-Free Cleavage and Final Deprotection in Fmoc Solid-Phase Peptide Synthesis: Dilute HCl in Fluoro Alcohol. Org Lett 2012; 14:6346-9. [DOI: 10.1021/ol303124r] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Pasquale Palladino
- Department of Chemistry, University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, U.K
| | - Dmitry A. Stetsenko
- Department of Chemistry, University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, U.K
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14
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Anderson VL, Webb WW, Eliezer D. Interplay between desolvation and secondary structure in mediating cosolvent and temperature induced alpha-synuclein aggregation. Phys Biol 2012; 9:056005. [PMID: 22932003 DOI: 10.1088/1478-3975/9/5/056005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Both increased temperature and moderate concentrations of fluorinated alcohols enhance aggregation of the Parkinson's disease-associated protein α-synuclein (αS). Here, we investigate the secondary structural rearrangements induced by heating and trifluoroethanol [TFE]. At low TFE concentrations, CD spectra feature a negative peak characteristic of disordered polypeptides near 200 nm and a slight shoulder around 220 nm suggesting some polyproline-II content. Upon heating, these peaks weaken, while a weak negative signal develops at 222 nm. At high TFE concentrations, the spectra show distinct minima at 208 and 222 nm, indicative of considerable α-helical structure, which diminish upon heating. We observe a crossover between the low-TFE and high-TFE behavior near 15% TFE, where we previously showed that a partially helical intermediate is populated. We postulate that the protein is well solvated by water at low TFE concentrations and by TFE at high TFE concentrations, but may become desolvated at the crossover point. We discuss the potential roles and interplay of desolvation and helical secondary structure in driving αS aggregation.
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Affiliation(s)
- V L Anderson
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
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15
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Subbalakshmi C, Manorama SV, Nagaraj R. Self-assembly of short peptides composed of only aliphatic amino acids and a combination of aromatic and aliphatic amino acids. J Pept Sci 2012; 18:283-92. [DOI: 10.1002/psc.2395] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 12/17/2011] [Accepted: 12/20/2011] [Indexed: 11/09/2022]
Affiliation(s)
| | - Sunkara V. Manorama
- CSIR-Indian Institute of Chemical Technology; Nanomaterials Laboratory; Uppal Road Hyderabad 500 007 India
| | - Ramakrishnan Nagaraj
- CSIR-Centre for Cellular and Molecular Biology; Uppal Road Hyderabad 500 007 India
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16
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Xie M, Li H, Ye M, Zhang Y, Hu J. Peptide Self-Assembly on Mica under Ethanol-Containing Atmospheres: Effects of Ethanol on Epitaxial Growth of Peptide Nanofilaments. J Phys Chem B 2012; 116:2927-33. [DOI: 10.1021/jp2089438] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Muyun Xie
- Shanghai Institute of Applied
Physics, Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
| | - Hai Li
- Shanghai Institute of Applied
Physics, Chinese Academy of Sciences
| | - Ming Ye
- Shanghai Institute of Applied
Physics, Chinese Academy of Sciences
| | - Yi Zhang
- Shanghai Institute of Applied
Physics, Chinese Academy of Sciences
| | - Jun Hu
- Shanghai Institute of Applied
Physics, Chinese Academy of Sciences
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17
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Anderson VL, Webb WW. A desolvation model for trifluoroethanol-induced aggregation of enhanced green fluorescent protein. Biophys J 2012; 102:897-906. [PMID: 22385861 DOI: 10.1016/j.bpj.2012.01.036] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 01/12/2012] [Accepted: 01/20/2012] [Indexed: 12/01/2022] Open
Abstract
Studies of amyloid disease-associated proteins in aqueous solutions containing 2,2,2-trifluoroethanol (TFE) have shown that the formation of structural intermediates is often correlated with enhanced protein aggregation. Here, enhanced green fluorescent protein (EGFP) is used as a model protein system to investigate the causal relationship between TFE-induced structural transitions and aggregation. Using circular dichroism spectroscopy, light scattering measurements, and transmission electron microscopy imaging, we demonstrate that population of a partially α-helical, monomeric intermediate is roughly correlated with the growth of β-sheet-rich, flexible fibrils for acid-denatured EGFP. By fitting our circular dichroism data to a model in which TFE-water mixtures are assumed to be ideal solutions, we show that increasing entropic costs of protein solvation in TFE-water mixtures may both cause the population of the intermediate state and increase aggregate production. Tertiary structure and electrostatic repulsion also impede aggregation. We conclude that initiation of EGFP aggregation in TFE likely involves overcoming of multiple protective factors, rather than stabilization of aggregation-prone structural elements.
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Affiliation(s)
- Valerie L Anderson
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York, USA
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18
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Gerig JT. Investigation of Methanol–Peptide Nuclear Overhauser Effects through Molecular Dynamics Simulations. J Phys Chem B 2012; 116:1965-73. [DOI: 10.1021/jp211098v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- J. T. Gerig
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106, United States
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19
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Pachahara SK, Chaudhary N, Subbalakshmi C, Nagaraj R. Hexafluoroisopropanol induces self-assembly of β-amyloid peptides into highly ordered nanostructures. J Pept Sci 2012; 18:233-41. [DOI: 10.1002/psc.2391] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 11/02/2011] [Accepted: 12/01/2011] [Indexed: 12/12/2022]
Affiliation(s)
- Sanjai Kumar Pachahara
- Council of Scientific and Industrial Research; Centre for Cellular and Molecular Biology; Uppal Road; Hyderabad; 500 007; India
| | - Nitin Chaudhary
- Council of Scientific and Industrial Research; Centre for Cellular and Molecular Biology; Uppal Road; Hyderabad; 500 007; India
| | - Chilukuri Subbalakshmi
- Council of Scientific and Industrial Research; Centre for Cellular and Molecular Biology; Uppal Road; Hyderabad; 500 007; India
| | - Ramakrishnan Nagaraj
- Council of Scientific and Industrial Research; Centre for Cellular and Molecular Biology; Uppal Road; Hyderabad; 500 007; India
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Abstract
In this chapter we provided the overall background to the subject of protein aggregation and fibrillogenesis in amyloidogenesis, with introduction and brief discussion of the various topics that are included with the coming chapters. The division of the book into basic science and clinical science sections enables correlation of the topics to be made. The many proteins and peptides that have currently been found to undergo fibrillogenesis are tabulated. A broad technical survey is made, to indicate the vast array of techniques currently available to study aspects of protein oligomerization, aggregation and fibrillogenesis. These are split into three groups and tabulated, as the microscopical techniques, the analytical and biophysical methods, and the biochemical and cellular techniques. A few techniques are discussed, but in most cases only a link to relevant recent literature is provided.
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Chaudhary N, Singh S, Nagaraj R. Aggregation properties of a short peptide that mediates amyloid fibril formation in model proteins unrelated to disease. J Biosci 2011; 36:679-89. [DOI: 10.1007/s12038-011-9104-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Chaudhary N, Nagaraj R. Self-assembly of short amyloidogenic peptides at the air–water interface. J Colloid Interface Sci 2011; 360:139-47. [DOI: 10.1016/j.jcis.2011.04.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 03/30/2011] [Accepted: 04/09/2011] [Indexed: 12/23/2022]
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Neuman RC, Gerig JT. Interactions of Nonprotic Organic Solvents with [Val5]angiotensin in Water. J Phys Chem B 2011; 115:1712-9. [DOI: 10.1021/jp1107125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Robert C. Neuman
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - John T. Gerig
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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Chaudhary N, Nagaraj R. Impact on the replacement of Phe by Trp in a short fragment of Aβ amyloid peptide on the formation of fibrils. J Pept Sci 2010; 17:115-23. [PMID: 21234983 DOI: 10.1002/psc.1339] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 11/01/2010] [Accepted: 11/07/2010] [Indexed: 11/11/2022]
Abstract
Aβ(16-22) (Ac-KLVFFAE-NH(2) ) is one of the shortest amyloid fibril-forming sequences identified in β-amyloid peptide. At neutral pH, the peptide forms fibrils in the concentration range of 0.2-2.0 mM after ≥ 10 days of incubation. Structures of the fibrils proposed based on solid-state NMR and MD simulations studies suggest antiparallel arrangement of β-strands and aromatic interactions between the Phe residues. In an effort to examine the role of aromatic interactions between two Phe residues in Aβ(16-22) , we have studied the self-assembly of Aβ(16-22) (AβFF) and two of its variants, Ac-KLVFWAE-NH(2) (AβFW) and Ac-KLVWFAE-NH(2) (AβWF). The peptides were dissolved in methanol (MeOH) at a concentration of 1 mM and in water (AβFW and AβWF, 1 mM; AβFF, 330 µM). Peptide solutions (100 µM) were prepared in 50 mM sodium phosphate buffer at pH 7 by diluting from MeOH and water stock solutions. AβFW forms amyloid-like fibrils immediately from MeOH, as indicated by atomic force microscopy. Dilution of AβFW into phosphate buffer from stock solution prepared in MeOH results in fibrils, but with different morphology and dimensions. The secondary structure potentiated by MeOH seems to be important for the self-assembly of AβFW, as fibrils are not formed from water where the peptide is unordered. On the other hand, AβFF and AβWF do not form amyloid fibrils rapidly from any of the solvents used for dissolution. However, drying of AβWF from MeOH on mica surface gives rod-like and fibrous structures. Our study indicates that positioning of the aromatic residues F and W has an important role to play in promoting self-assembly of the Aβ(16-22) peptides.
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Affiliation(s)
- Nitin Chaudhary
- Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Uppal Road, Hyderabad 500 007, India
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Neuman RC, Gerig JT. Interaction of Alcohols with [Val5]angiotensin in Alcohol−Water Mixtures. J Phys Chem B 2010; 114:6722-31. [DOI: 10.1021/jp101305u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. C. Neuman
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106
| | - J. T. Gerig
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106
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