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Li JY, Zhou CM, Jin RL, Song JH, Yang KC, Li SL, Tan BH, Li YC. The detection methods currently available for protein aggregation in neurological diseases. J Chem Neuroanat 2024; 138:102420. [PMID: 38626816 DOI: 10.1016/j.jchemneu.2024.102420] [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: 12/31/2023] [Revised: 03/30/2024] [Accepted: 04/13/2024] [Indexed: 04/21/2024]
Abstract
Protein aggregation is a pathological feature in various neurodegenerative diseases and is thought to play a crucial role in the onset and progression of neurological disorders. This pathological phenomenon has attracted increasing attention from researchers, but the underlying mechanism has not been fully elucidated yet. Researchers are increasingly interested in identifying chemicals or methods that can effectively detect protein aggregation or maintain protein stability to prevent aggregation formation. To date, several methods are available for detecting protein aggregates, including fluorescence correlation spectroscopy, electron microscopy, and molecular detection methods. Unfortunately, there is still a lack of methods to observe protein aggregation in situ under a microscope. This article reviews the two main aspects of protein aggregation: the mechanisms and detection methods of protein aggregation. The aim is to provide clues for the development of new methods to study this pathological phenomenon.
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Affiliation(s)
- Jing-Yi Li
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Cheng-Mei Zhou
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Rui-Lin Jin
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Jia-Hui Song
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China; Key Laboratory of Pathobiology, Ministry of Education, Jilin University, Changchun 130021, PR China
| | - Ke-Chao Yang
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Shu-Lei Li
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Bai-Hong Tan
- Laboratory Teaching Center of Basic Medicine, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China
| | - Yan-Chao Li
- Department of Histology and Embryology, College of Basic Medical Sciences, Norman Bethune Health Science Center of Jilin University, Changchun city, Jilin Province 130021, PR China; Key Laboratory of Pathobiology, Ministry of Education, Jilin University, Changchun 130021, PR China.
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2
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Miura K, Fujihara M, Watanabe M, Takamura Y, Kawasaki M, Nakano S, Kakuta H. Direct evaluation of polarity of the ligand binding pocket in retinoid X receptor using a fluorescent solvatochromic agonist. Bioorg Med Chem Lett 2023; 96:129536. [PMID: 37913851 DOI: 10.1016/j.bmcl.2023.129536] [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: 06/04/2023] [Revised: 10/03/2023] [Accepted: 10/22/2023] [Indexed: 11/03/2023]
Abstract
High selectivity of small-molecule drug candidates for their target molecule is important to minimize potential side effects. One factor that contributes to the selectivity is the internal polarity of the ligand-binding pocket (LBP) in the target molecule, but this is difficult to measure. Here, we first confirmed that the retinoid X receptor (RXR) agonist 6-(ethyl(1-isobutyl-2-oxo-4-(trifluoromethyl)-1,2-dihydroquinolin-7-yl)amino)nicotinic acid (NEt-iFQ, 1) exhibits fluorescence solvatochromism, i.e., its Stokes shift depends on the polarity of the solvent, and then we utilized this property to directly measure the internal polarity of the RXRα-LBP. The Stokes shift of 1 when bound to the RXRα-LBP corresponded to that of 1 in chloroform solution. This finding is expected to be helpful for designing RXR-selective ligands. A similar approach should be appliable to evaluate the internal polarity of the LBPs of other receptors.
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Affiliation(s)
- Kizuku Miura
- Faculty of Pharmaceutical Sciences, Okayama University, 1-1-1, Tsushima-naka, Kita-ku Okayama 700-8530, Japan
| | - Michiko Fujihara
- Division of Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 1-1-1, Tsushima-naka, Kita-ku Okayama 700-8530, Japan; Department of Liberal Arts, The Open University of Japan, 2-11 Wakaba, Mihama-ku, Chiba 261- 8586, Japan
| | - Masaki Watanabe
- Division of Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 1-1-1, Tsushima-naka, Kita-ku Okayama 700-8530, Japan
| | - Yuta Takamura
- Division of Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 1-1-1, Tsushima-naka, Kita-ku Okayama 700-8530, Japan
| | - Mayu Kawasaki
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, 52- 1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Shogo Nakano
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, 52- 1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Hiroki Kakuta
- Division of Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 1-1-1, Tsushima-naka, Kita-ku Okayama 700-8530, Japan.
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3
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Wei G, Kudo Y, Matsuda T, Wang ZJ, Mu QF, King DR, Nakajima T, Gong JP. Sustainable mechanochemical growth of double-network hydrogels supported by vascular-like perfusion. MATERIALS HORIZONS 2023; 10:4882-4891. [PMID: 37602807 DOI: 10.1039/d3mh01038d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Double-network (DN) gels are unique mechanochemical materials owing to their structures that can be dynamically remodelled during use. The mechanical energy applied to DN gels is efficiently transferred to the chemical bonds of the brittle network, generating mechanoradicals that initiate the polymerisation of pre-loaded monomers, thereby remodelling the materials. To attain continuous remodelling or growth in response to repetitive mechanical stimuli, a sustainable supply of chemical reagents to such dynamic materials is essential. In this study, inspired by the vascular perfusion transporting nutrients to cells, we constructed a circulatory system for a continuous supply of chemicals to channel-containing DN hydrogels (c-DN gels). The perfusion of monomer solutions through the channel and permeability of the c-DN gels not only replenishes the monomers consumed by the polymerisation but also replenishes the water loss caused by the surface evaporation of hydrogel, thereby freeing the mechanochemical process of DN gels from the constraints of the underwater environment. The facile chemical supply enabled us to modulate the mechanical enhancement of the c-DN gel and attain muscle-like strengthening under repeated mechanical training in deoxygenated air. We also studied the kinetics of polymer growth and strengthening and deciphered unique features of mechanochemical reaction in DN gels including the extremely long-living radicals and delayed mechanical strengthening.
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Affiliation(s)
- Gumi Wei
- Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Yumeko Kudo
- Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Takahiro Matsuda
- Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Zhi Jian Wang
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan.
| | - Qi Feng Mu
- Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Daniel R King
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Tasuku Nakajima
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan.
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 001-0021, Japan
| | - Jian Ping Gong
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan.
- Faculty of Advanced Life Science, Hokkaido University, Sapporo 001-0021, Japan
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4
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Dinesan H, Kumar SS. Laser-Induced Fluorescence (LIF) Spectroscopy of Trapped Molecular Ions in the Gas Phase. APPLIED SPECTROSCOPY 2022; 76:1393-1411. [PMID: 36263923 DOI: 10.1177/00037028221120830] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
This review focuses on the laser-induced fluorescence (LIF) spectroscopy of trapped gas-phase molecular ions, a developing field of research. Following a brief description of the theory and experimental approaches employed in general for fluorescence spectroscopy, the review summarizes the current state-of-the-art intrinsic fluorescence measurement techniques employed for gas-phase ions. Whereas the LIF spectroscopy of condensed matter systems is a well-developed area of research, the instrumentation used for such studies is not directly applicable to gas-phase ions. However, some measurement schemes employed in condensed-phase experiments could be highly beneficial for gas-phase investigations. We have included a brief discussion on some of these techniques as well. Quadrupole ion traps are commonly used for spatial confinement of ions in the ion-trap-based LIF. One of the main challenges involved in such experiments is the poor signal-to-noise ratio (SNR) arising due to weak gas-phase fluorescence emission, high background noise, and small solid angle for the fluorescence collection optics. The experimental approaches based on the integrated high-finesse optical cavities employed for the condensed-phase measurements provide a better (typically an order of magnitude more) SNR in the detected fluorescence than the single-pass detection schemes. Another key to improving the SNR is to exploit the maximum solid angle of light collection by choosing high numerical aperture (NA) collection optics. A combination of these two approaches integrated with ion traps could transmogrify this field, allowing one to study even weak fluorescence emission from gas-phase molecular ions. The review concludes by discussing the scope of the advances in the LIF instrumentation for detailed spectral characterization of fluorophores of weak gas-phase fluorescence emission, considering fluorescein as one example.
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Affiliation(s)
- Hemanth Dinesan
- Department of Physics and Center for Atomic, Molecular, and Optical Sciences and Technologies (CAMOST), 443874Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati, India
| | - S Sunil Kumar
- Department of Physics and Center for Atomic, Molecular, and Optical Sciences and Technologies (CAMOST), 443874Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati, India
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5
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Micikas RJ, Acharyya A, Smith AB, Gai F. Synthesis and characterization of the fluorescence utility of two Visible-Light-Absorbing tryptophan derivatives. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Zhao X, Li X, Liang S, Dong X, Zhang Z. 3-Hydroxyflavone derivatives: promising scaffolds for fluorescent imaging in cells. RSC Adv 2021; 11:28851-28862. [PMID: 35478549 PMCID: PMC9038104 DOI: 10.1039/d1ra04767a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Accepted: 08/21/2021] [Indexed: 11/21/2022] Open
Abstract
As a typical class of excited-state intramolecular proton transfer (ESIPT) molecules, 3-hydroxyflavone derivatives (3HF, also known as flavonols) have received much attention recently. Thereinto, the role of hydrophobic microenvironment is significant importance in promoting the process and effects of ESIPT, which can be regulated by the solvents, the existence of metal ions and proteins rich with α-helix structures or the advanced DNA structures. Considering that plenty of biological macromolecules offer cellular hydrophobic microenvironment, enhancing the ESIPT effects and resulting in dual emission, 3HF could be a promising scaffold for the development of fluorescent imaging in cells. Furthermore, as the widespread occurance of compounds with biological activity in plants, 3HF derivatives are much more secure to be cellular diagnosis and treatment integrated fluorescent probes. In this review, multiple regulatory strategies for the fluorescence emission of 3HF derivatives have been collectively and comprehensively analyzed, including the solvent effects, metal chelation, interaction with proteins or DNAs, which would be beneficial for ESIPT-promoting or ESIPT-blocking processes and then enhance or control the fluorescence emission of 3HF effectively. We expect that this review would provide a new perspective to develop novel 3HF-based fluorescent sensors for imaging in cells and plants.
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Affiliation(s)
- Xueke Zhao
- National Local Joint Engineering Laboratory for Advanced Textile Processing and Clean Production, Wuhan Textile University Wuhan Hubei 430073 P. R. China
| | - Xiang Li
- College of Chemistry and Molecular Engineering, Peking University Beijing 100871 P. R. China .,School of Chemistry, Central China Normal University Wuhan Hubei 430079 P. R. China
| | - Shuyu Liang
- College of Chemistry and Molecular Engineering, Peking University Beijing 100871 P. R. China
| | - Xiongwei Dong
- National Local Joint Engineering Laboratory for Advanced Textile Processing and Clean Production, Wuhan Textile University Wuhan Hubei 430073 P. R. China
| | - Zhe Zhang
- Institute of Environmental Research at Greater Bay Area, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou Key Laboratory for Clean Energy and Materials, Guangzhou University Guangzhou 510006 China
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7
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Matsuda T, Kawakami R, Nakajima T, Gong JP. Crack Tip Field of a Double-Network Gel: Visualization of Covalent Bond Scission through Mechanoradical Polymerization. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01485] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Takahiro Matsuda
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
| | - Runa Kawakami
- Graduate School of Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
| | - Tasuku Nakajima
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
- Soft Matter GI-CoRE, Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
| | - Jian Ping Gong
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
- Soft Matter GI-CoRE, Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
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8
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Szigyártó IC, Mihály J, Wacha A, Bogdán D, Juhász T, Kohut G, Schlosser G, Zsila F, Urlacher V, Varga Z, Fülöp F, Bóta A, Mándity I, Beke-Somfai T. Membrane active Janus-oligomers of β 3-peptides. Chem Sci 2020; 11:6868-6881. [PMID: 33042513 PMCID: PMC7504880 DOI: 10.1039/d0sc01344g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 06/12/2020] [Indexed: 11/21/2022] Open
Abstract
Self-assembly of an acyclic β3-hexapeptide with alternating side chain chirality, into nanometer size oligomeric bundles showing membrane activity and hosting capacity for hydrophobic small molecules.
Self-assembling peptides offer a versatile set of tools for bottom-up construction of supramolecular biomaterials. Among these compounds, non-natural peptidic foldamers experience increased focus due to their structural variability and lower sensitivity to enzymatic degradation. However, very little is known about their membrane properties and complex oligomeric assemblies – key areas for biomedical and technological applications. Here we designed short, acyclic β3-peptide sequences with alternating amino acid stereoisomers to obtain non-helical molecules having hydrophilic charged residues on one side, and hydrophobic residues on the other side, with the N-terminus preventing formation of infinite fibrils. Our results indicate that these β-peptides form small oligomers both in water and in lipid bilayers and are stabilized by intermolecular hydrogen bonds. In the presence of model membranes, they either prefer the headgroup regions or they insert between the lipid chains. Molecular dynamics (MD) simulations suggest the formation of two-layered bundles with their side chains facing opposite directions when compared in water and in model membranes. Analysis of the MD calculations showed hydrogen bonds inside each layer, however, not between the layers, indicating a dynamic assembly. Moreover, the aqueous form of these oligomers can host fluorescent probes as well as a hydrophobic molecule similarly to e.g. lipid transfer proteins. For the tested, peptides the mixed chirality pattern resulted in similar assemblies despite sequential differences. Based on this, it is hoped that the presented molecular framework will inspire similar oligomers with diverse functionality.
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Affiliation(s)
- Imola Cs Szigyártó
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - Judith Mihály
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - András Wacha
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - Dóra Bogdán
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ; .,Department of Organic Chemistry , Faculty of Pharmacy , Semmelweis University , H-1092 Budapest , Hungary
| | - Tünde Juhász
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - Gergely Kohut
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ; .,Institute of Chemistry , Eötvös Loránd University , H-1117 Budapest , Hungary
| | - Gitta Schlosser
- Institute of Chemistry , Eötvös Loránd University , H-1117 Budapest , Hungary
| | - Ferenc Zsila
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - Vlada Urlacher
- Institute of Biochemistry , Heinrich-Heine University , 40225 Düsseldorf , Germany
| | - Zoltán Varga
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - Ferenc Fülöp
- MTA-SZTE Stereochemistry Research Group , Institute of Pharmaceutical Chemistry , University of Szeged , H-6720 Szeged , Hungary
| | - Attila Bóta
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ;
| | - István Mándity
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ; .,Department of Organic Chemistry , Faculty of Pharmacy , Semmelweis University , H-1092 Budapest , Hungary
| | - Tamás Beke-Somfai
- Institute of Materials and Environmental Chemistry , Research Centre for Natural Sciences , H-1117 Budapest , Hungary . ; .,Department of Chemistry and Chemical Engineering , Physical Chemistry , Chalmers University of Technology , SE-41296 Göteborg , Sweden
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9
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Xiao H, Zhang T, Dong Y, Song X, Xing L, Zhou J, Liu Y, Zhuo S. The photophysical properties and imaging application of a new polarity-sensitive fluorescent probe. Analyst 2020; 145:6556-6561. [DOI: 10.1039/d0an01064b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We develop a new polarity-sensitive fluorescent probe that displays weak fluorescence in low-polarity solvents and intense fluorescence in high-polarity solvents.
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Affiliation(s)
- Haibin Xiao
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
- College of Chemistry
| | - Tian Zhang
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Yaqi Dong
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Xiaojuan Song
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Lingbao Xing
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Jin Zhou
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Yuying Liu
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Shuping Zhuo
- School of Chemistry and Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
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10
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Nooshi-Nedamani S, Habibi-Rezaei M, Farzadfard A, Moosavi-Movahedi AA. Intensification of serum albumin amyloidogenesis by a glycation-peroxidation loop (GPL). Arch Biochem Biophys 2019; 668:54-60. [PMID: 31091430 DOI: 10.1016/j.abb.2019.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 05/07/2019] [Accepted: 05/09/2019] [Indexed: 11/18/2022]
Abstract
The interaction of reducing sugars with proteins leads to the formation of advanced glycation end products (AGE) and reactive oxidative species (ROS). ROS peroxidise free or membrane included unsaturated fatty acids, leading to generate reactive aldehydes as advanced lipid peroxidation end products (ALE). Aldehydes from lipid peroxidation (LPO) react with proteins to cause alteration of protein structure to exacerbate complication of diseases. Here we studied serum albumin glycation in the presence and absence of liposomes as a bio-membrane model to investigate protein structural changes using various techniques including intrinsic and extrinsic fluorescence spectroscopies and electron microscopy analysis. Accordingly, serum albumin glycation and fibrillation were accelerated and intensified in the presence of liposomes through a hypothesized glycation-peroxidation loop (GPL). Together, our results shed light on the necessity of reconsidering diabetic protein glycation to make it close to physiological conditions mimicry, more importantly, proteins structural change due to diabetic glycation is intensified in the proximity of cell membranes which probably potentiates programmed cell death distinct from apoptosis.
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Affiliation(s)
- S Nooshi-Nedamani
- Protein Biotechnology Research Lab (PBRL), School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - M Habibi-Rezaei
- Protein Biotechnology Research Lab (PBRL), School of Biology, College of Science, University of Tehran, Tehran, Iran; Nano-Biomedicine Center of Excellence, Nanoscience and Nanotechnology Research Center, University of Tehran, Tehran, Iran.
| | - A Farzadfard
- Protein Biotechnology Research Lab (PBRL), School of Biology, College of Science, University of Tehran, Tehran, Iran
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11
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Singh UK, Patel R. Dynamics of Ionic Liquid-Assisted Refolding of Denatured Cytochrome c: A Study of Preferential Interactions toward Renaturation. Mol Pharm 2018; 15:2684-2697. [PMID: 29767978 DOI: 10.1021/acs.molpharmaceut.8b00212] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In vitro refolding of denatured protein and the influence of the alkyl chain on the refolding of a protein were tested using long chain imidazolium chloride salts, 1-methyl-3-octylimidazolium chloride [C8mim][Cl], and 1-decyl-3-methylimidazolium chloride [C10mim][Cl]. The horse heart cytochrome c (h-cyt c) was denatured by urea and guanidinium hydrochloride (GdnHCl), as well as by base-induced denaturation at pH 13, to provide a broad overview of the overall refolding behavior. The variation in the alkyl chain of the ionic liquids (ILs) showed a profound effect on the refolding of denatured h-cyt c. The ligand-induced refolding was correlated to understand the mechanism of the conformational stability of proteins in aqueous solutions of ILs. The results showed that the long chain ILs having the [C8mim]+ and [C10mim]+ cations promote the refolding of alkali-denatured h-cyt c. The IL having the [C10mim]+ cation efficiently refolded the alkali-denatured h-cyt c with the formation of the MG state, whereas the IL having the [C8mim]+ cation, which is known to be compatible for protein stability, shows slight refolding and forms a different transition state. The lifetime results show successful refolding of alkaline-denatured h-cyt c by both of the ILs, however, more refolding was observed in the case of [C10mim][Cl], and this was correlated with the fast and medium lifetimes (τ1 and τ2) obtained, which show an increase accompanied by an increase in secondary structure. The hydrophobic interactions plays an important role in the refolding of chemically and alkali-denatured h-cyt c by long chain imidazolium ILs. The formation of the MG state by [C10mim][Cl] was also confirmed, as some regular structure exists far below the CMC of IL. The overall results suggested that the [C10mim]+ cation bound to the unfolded h-cyt c triggers its refolding by electrostatic and hydrophobic interactions that stabilize the MG state.
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Affiliation(s)
- Upendra Kumar Singh
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi 110025 , India
| | - Rajan Patel
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia (A Central University) , New Delhi 110025 , India
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12
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Clarification of the inner microenvironments in poly(N-isopropylacrylamide) hydrogels in macrogel and microgel forms using a fluorescent probe technique. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.12.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Takano H, Narumi T, Nomura W, Tamamura H. Microwave-Assisted Synthesis of Azacoumarin Fluorophores and the Fluorescence Characterization. J Org Chem 2017; 82:2739-2744. [DOI: 10.1021/acs.joc.6b02656] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hikaru Takano
- Institution of Biomaterial
and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Tetsuo Narumi
- Institution of Biomaterial
and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Wataru Nomura
- Institution of Biomaterial
and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Hirokazu Tamamura
- Institution of Biomaterial
and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
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14
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Giardinetti M, Marrot J, Coeffard V, Moreau X, Greck C. Synthesis and fluorosolvatochromic properties of 1,7-annulated indoles. NEW J CHEM 2017. [DOI: 10.1039/c7nj00365j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New push–pull indole-based fluorescent dyes have been prepared and these compounds exhibit fluorosolvatochromic properties.
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Affiliation(s)
- Maxime Giardinetti
- Institut Lavoisier de Versailles
- UMR CNRS 8180
- Université de Versailles-St-Quentin-en-Yvelines
- 78035 Versailles Cedex
- France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles
- UMR CNRS 8180
- Université de Versailles-St-Quentin-en-Yvelines
- 78035 Versailles Cedex
- France
| | - Vincent Coeffard
- Institut Lavoisier de Versailles
- UMR CNRS 8180
- Université de Versailles-St-Quentin-en-Yvelines
- 78035 Versailles Cedex
- France
| | - Xavier Moreau
- Institut Lavoisier de Versailles
- UMR CNRS 8180
- Université de Versailles-St-Quentin-en-Yvelines
- 78035 Versailles Cedex
- France
| | - Christine Greck
- Institut Lavoisier de Versailles
- UMR CNRS 8180
- Université de Versailles-St-Quentin-en-Yvelines
- 78035 Versailles Cedex
- France
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15
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Jiang YW, Gao G, Chen Z, Wu FG. Fluorescence studies on the interaction between chlorpromazine and model cell membranes. NEW J CHEM 2017. [DOI: 10.1039/c7nj00037e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fluorescence quenching of membrane fluorophores and the fluorescence enhancement of chlorpromazine were simultaneously observed during chlorpromazine–lipid membrane interaction.
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Affiliation(s)
- Yao-Wen Jiang
- State Key Laboratory of Bioelectronics
- School of Biological Science and Medical Engineering
- Southeast University
- Nanjing 210096
- P. R. China
| | - Ge Gao
- State Key Laboratory of Bioelectronics
- School of Biological Science and Medical Engineering
- Southeast University
- Nanjing 210096
- P. R. China
| | - Zhan Chen
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
| | - Fu-Gen Wu
- State Key Laboratory of Bioelectronics
- School of Biological Science and Medical Engineering
- Southeast University
- Nanjing 210096
- P. R. China
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16
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Liu Z, Jiang T, Wang B, Ke B, Zhou Y, Du L, Li M. Environment-Sensitive Fluorescent Probe for the Human Ether-a-go-go-Related Gene Potassium Channel. Anal Chem 2016; 88:1511-5. [PMID: 26730746 PMCID: PMC4741275 DOI: 10.1021/acs.analchem.5b04220] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
![]()
A novel
environment-sensitive probe S2 with turn-on switch for
Human Ether-a-go-go-Related Gene (hERG) potassium channel was developed
herein. After careful evaluation, this fluorescent probe showed high
binding affinity with hERG potassium channel with an IC50 value of 41.65 nM and can be well applied to hERG channel imaging
or cellular distribution study for hERG channel blockers. Compared
with other imaging techniques, such as immunofluorescence and fluorescent
protein-based approaches, this method is convenient and affordable,
especially since a washing procedure is not needed. Meanwhile, this
environment-sensitive turn-on design strategy may provide a good example
for the probe development for these targets that have no reactive
or catalytic activity.
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Affiliation(s)
- Zhenzhen Liu
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Tianyu Jiang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Beilei Wang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Bowen Ke
- Laboratory of Anaesthesiology and Critical Care Medicine, West China Hospital, Sichuan University , Chengdu, Sichuan 610041, China
| | - Yubin Zhou
- Institute of Biosciences and Technology, Texas A&M University Health Science Center , Houston, Texas 77030, United States
| | - Lupei Du
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
| | - Minyong Li
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University , Jinan, Shandong 250012, China
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17
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Fukui Y, Kabayama N, Fujimoto K. Fine-tuning in mineral cross-linking of biopolymer nanoparticle for incorporation and release of cargo. Colloids Surf B Biointerfaces 2015; 136:168-74. [DOI: 10.1016/j.colsurfb.2015.09.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 08/13/2015] [Accepted: 09/05/2015] [Indexed: 01/13/2023]
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18
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Investigating the chaperone activity of β-casein in preventing amyloid formation in κ-casein in the presence of dextran. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2015. [DOI: 10.1007/s40005-015-0183-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Yamaguchi E, Wang C, Fukazawa A, Taki M, Sato Y, Sasaki T, Ueda M, Sasaki N, Higashiyama T, Yamaguchi S. Environment-Sensitive Fluorescent Probe: A Benzophosphole Oxide with an Electron-Donating Substituent. Angew Chem Int Ed Engl 2015; 54:4539-43. [DOI: 10.1002/anie.201500229] [Citation(s) in RCA: 140] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Indexed: 01/03/2023]
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20
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Yamaguchi E, Wang C, Fukazawa A, Taki M, Sato Y, Sasaki T, Ueda M, Sasaki N, Higashiyama T, Yamaguchi S. Environment-Sensitive Fluorescent Probe: A Benzophosphole Oxide with an Electron-Donating Substituent. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500229] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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21
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Khan MV, Rabbani G, Ahmad E, Khan RH. Fluoroalcohols-induced modulation and amyloid formation in conalbumin. Int J Biol Macromol 2014; 70:606-14. [DOI: 10.1016/j.ijbiomac.2014.07.027] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 06/27/2014] [Accepted: 07/09/2014] [Indexed: 10/25/2022]
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22
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Trifluorosilane induced structural transitions in beta-lactoglobulin in sol and gel. Colloids Surf B Biointerfaces 2014; 119:6-13. [DOI: 10.1016/j.colsurfb.2014.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 04/21/2014] [Accepted: 04/22/2014] [Indexed: 11/17/2022]
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23
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Dobretsov GE, Syrejschikova TI, Smolina NV. On mechanisms of fluorescence quenching by water. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914020079] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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24
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Ravi VK, Goel M, Kotamarthi HC, Ainavarapu SRK, Swaminathan R. Preventing disulfide bond formation weakens non-covalent forces among lysozyme aggregates. PLoS One 2014; 9:e87012. [PMID: 24551048 PMCID: PMC3925087 DOI: 10.1371/journal.pone.0087012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Accepted: 12/16/2013] [Indexed: 12/21/2022] Open
Abstract
Nonnative disulfide bonds have been observed among protein aggregates in several diseases like amyotrophic lateral sclerosis, cataract and so on. The molecular mechanism by which formation of such bonds promotes protein aggregation is poorly understood. Here in this work we employ previously well characterized aggregation of hen eggwhite lysozyme (HEWL) at alkaline pH to dissect the molecular role of nonnative disulfide bonds on growth of HEWL aggregates. We employed time-resolved fluorescence anisotropy, atomic force microscopy and single-molecule force spectroscopy to quantify the size, morphology and non-covalent interaction forces among the aggregates, respectively. These measurements were performed under conditions when disulfide bond formation was allowed (control) and alternatively when it was prevented by alkylation of free thiols using iodoacetamide. Blocking disulfide bond formation affected growth but not growth kinetics of aggregates which were ∼50% reduced in volume, flatter in vertical dimension and non-fibrillar in comparison to control. Interestingly, single-molecule force spectroscopy data revealed that preventing disulfide bond formation weakened the non-covalent interaction forces among monomers in the aggregate by at least ten fold, thereby stalling their growth and yielding smaller aggregates in comparison to control. We conclude that while constrained protein chain dynamics in correctly disulfide bonded amyloidogenic proteins may protect them from venturing into partial folded conformations that can trigger entry into aggregation pathways, aberrant disulfide bonds in non-amyloidogenic proteins (like HEWL) on the other hand, may strengthen non-covalent intermolecular forces among monomers and promote their aggregation.
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Affiliation(s)
- Vijay Kumar Ravi
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Mohit Goel
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Hema Chandra Kotamarthi
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, India
| | - Sri Rama Koti Ainavarapu
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, India
| | - Rajaram Swaminathan
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
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25
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The fate of anticancer drug, ellipticine in DPPC and DMPC liposomes upon interaction with HSA: A photophysical approach. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 130:122-31. [DOI: 10.1016/j.jphotobiol.2013.10.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 09/30/2013] [Accepted: 10/24/2013] [Indexed: 11/18/2022]
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27
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Amini R, Yazdanparast R, Bahramikia S. Apigenin reduces human insulin fibrillation in vitro and protects SK-N-MC cells against insulin amyloids. Int J Biol Macromol 2013; 60:334-40. [PMID: 23777711 DOI: 10.1016/j.ijbiomac.2013.06.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2013] [Revised: 06/10/2013] [Accepted: 06/13/2013] [Indexed: 01/21/2023]
Abstract
Deposition of proteins is a key pathogenic feature of more than 20 amyloid-related diseases. Inhibiting or reversing amyloid aggregation via the use of small molecules is proposed as two useful approaches in hampering the development of these diseases. In this research, we examined the inhibitory and disruptive effects of apigenin, a common dietary flavonoid with multiple pharmacological properties, against human insulin fibrillization. Besides, we investigated the potential cytotoxicity of insulin fibrils on SK-N-MC cells in the presence and absence of apigenin. The increase in Thioflavin T (ThT) and anilinonaphthalene-8-sulfonic acid (ANS) fluorescent intensities and Congo red absorbance were inhibited by simultaneous incubation of various concentrations of apigenin with insulin, in a dose-dependent manner. The spectroscopy results were confirmed by transmission electron microscopy, where lower extent of fibrillar structures was observed in the presence of apigenin. In addition, the cell exposure to the co-incubated insulin amyloids with apigenin led to the increased viability and decreased LDH release dose-dependently, compared to cells exposed to insulin fibrils alone. Co-incubation with apigenin also attenuated the extent of apoptotic cell death induced by insulin fibrils. It can be concluded that apigenin possess in vitro anti-amyloidogenic activities as well as protective effects against insulin amyloids cytotoxicity.
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Affiliation(s)
- Rahim Amini
- Institute of Biochemistry and Biophysics, P. O. Box 13145-1384, University of Tehran, Tehran, Iran
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28
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Synthesis of d-amino acid peptides and their effect on beta-amyloid aggregation and toxicity in transgenic Caenorhabditis elegans. Med Chem Res 2012. [DOI: 10.1007/s00044-012-0386-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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29
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Fukunaga S, Ueno H, Yamaguchi T, Yano Y, Hoshino M, Matsuzaki K. GM1 cluster mediates formation of toxic Aβ fibrils by providing hydrophobic environments. Biochemistry 2012; 51:8125-31. [PMID: 23009396 DOI: 10.1021/bi300839u] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The conversion of soluble, nontoxic amyloid β-proteins (Aβ) to aggregated, toxic forms rich in β-sheets is considered to be a key step in the development of Alzheimer's disease. Accumulating evidence suggests that lipid-protein interactions play a crucial role in the aggregation of amyloidogenic proteins like Aβ. Our group has previously reported that amyloid fibrils of Aβ formed on membranes containing clusters of GM1 ganglioside (M-fibrils) exhibit greater cytotoxicity than fibrils formed in aqueous solution (W-fibrils) [ Okada ( 2008 ) J. Mol. Biol. 382 , 1066 - 1074 ]. W-fibrils are considered to consist of in-register parallel β-sheets. However, the precise molecular structure of M-fibrils and force driving the formation of toxic fibrils remain unclear. In this study, we hypothesized that low-polarity environments provided by GM1 clusters drive the formation of toxic fibrils and compared the structure and cytotoxicity of W-fibrils, M-fibrils, and aggregates formed in a low-polarity solution mimicking membrane environments. First, we determined solvent conditions which mimic the polarity of raftlike membranes using Aβ-(1-40) labeled with the 7-diethylaminocoumarin-3-carbonyl dye. The polarity of a mixture of 80% 1,4-dioxane and 20% water (v/v) was found to be close to that of raftlike membranes. Aβ-(1-40) formed amyloid fibrils within several hours in 80% dioxane (D-fibrils) or in the presence of raftlike membranes, whereas a much longer incubation time was required for fibril formation in a conventional buffer. D-fibrils were morphologically similar to M-fibrils. Fourier-transform infrared spectroscopy suggested that M-fibrils and D-fibrils contained antiparallel β-sheets. These fibrils had greater surface hydrophobicity and exhibited significant toxicity against human neuroblastoma SH-SY5Y cells, whereas W-fibrils with less surface hydrophobicity were not cytotoxic. We concluded that ganglioside clusters mediate the formation of toxic amyloid fibrils of Aβ with an antiparallel β-sheet structure by providing less polar environments.
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Affiliation(s)
- Saori Fukunaga
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida-Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
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30
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Saitoh T, Ono N, Hiraide M. Effective collection of hydrophobic organic pollutants in water with aluminum hydroxide and hydrophobically modified polyacrylic acid. CHEMOSPHERE 2012; 89:759-763. [PMID: 22840533 DOI: 10.1016/j.chemosphere.2012.07.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 07/04/2012] [Accepted: 07/06/2012] [Indexed: 06/01/2023]
Abstract
Polyacrylic acid was hydrophobically modified with dodecylamine and used as a coagulant for coprecipitation of hydrophobic organic pollutants from water. The polymer coagulant induced effective aggregation of aluminum hydroxide having hydrophobic regions which are essential for the incorporation of hydrophobic organic pollutants. Recoveries of the organic pollutants increased with increasing the dodecylamine content, which indicated that the dodecylamine moiety played an important role in the formation of hydrophobic area on the precipitate. Different hydrophobic organic pollutants that had hardly been removed by the conventional coprecipitation were successfully collected by the proposed method.
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Affiliation(s)
- Tohru Saitoh
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Fro-cho, Chikusa-ku, Nagoya 464-8603, Japan.
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31
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Shelar DP, Rote RV, Patil SR, Jachak MN. Effects of homogeneous media, binary mixtures and microheterogeneous media on the fluorescence and fluorescence probe properties of some benzo[b][1,8]naphthyridiens with HSA and BSA. LUMINESCENCE 2011; 27:398-413. [PMID: 22102403 DOI: 10.1002/bio.1364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/30/2011] [Accepted: 09/01/2011] [Indexed: 11/07/2022]
Abstract
A rapid and efficient method for the synthesis of various poly-substituted benzo[b][1,8]naphthyridines in high yield has been developed via the Friedländer condensation of 2-aminoquinoline-3-carbaldehyde 1 with various alicyclic ketones in a base catalyst (aq. potassium hydroxide). A series of benzo[b][1,8]naphthyridines branched with various side-chains and substituents were prepared with the aim of being investigated as a fluorescent agents. Electronic absorption and fluorescence properties of some representative benzonaphthyridines (3d, 5b and 21f) in homogeneous organic solvents, dioxane-water binary mixtures and in the microheterogeneous media (sodium dodecyl sulphate (SDS), cetyl trimethyl ammonium bromide (CTAB) and Triton-X100 micelles) have been examined. A linear correlation between solvent polarity and fluorescence properties was observed. Further, the interaction of these benzonaphthyridines (3d, 5b and 21f) with human serum albumin (HSA) and bovine serum albumin (BSA) in phosphate buffer have been examined by UV-vis absorption and fluorescence spectroscopy. The fluorescence intensity of 3d, 5b and 21f increases with the increasing HSA and BSA concentration. These benzonaphthyridines also quench the 345 nm fluorescence of BSA in phosphate buffer (λ(ex) 280 nm). These compounds have potential for use as neutral and hydrophobic fluorescence probes for examining the microenvironments in proteins, polymers, micelles, etc.
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Affiliation(s)
- Deepak P Shelar
- Organic Chemistry Research Centre, Department of Chemistry, KTHM College, Gangapur Road, Nashik, 422002, MS, India
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32
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Bhat JY, Venkatachala R, Balaram H. Substrate-induced conformational changes in Plasmodium falciparum guanosine monophosphate synthetase. FEBS J 2011; 278:3756-68. [PMID: 21827625 DOI: 10.1111/j.1742-4658.2011.08296.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
GMP synthetase is a glutamine amidotransferase that incorporates ammonia derived from glutamine into the nucleotide xanthosine 5'-monophosphate (XMP) to form guanosine 5'-monophosphate (GMP). Functional coordination of domains in glutamine amidotransferases leads to upregulation of glutamine hydrolysis in the presence of acceptor substrates and is a common feature in this class of enzymes. We have shown earlier that binding of substrates to the acceptor domain of Plasmodium falciparum GMP synthetase (PfGMPS) leads to enhancement in both glutaminase activity and rate of glutaminase inactivation, by the irreversible inhibitors acivicin and diazo-oxonorleucine [Bhat JY et al. (2008) Biochem J409, 263-273], a process that must be driven by conformational alterations. In this paper, through the combined use of biochemical assays, optical spectroscopy and mass spectrometry, we demonstrate that PfGMPS undergoes conformational transitions upon binding of substrates to the acceptor domain. Limited proteolysis and hydrogen-deuterium exchange in conjunction with mass spectrometry unveil region-specific conformational changes in the ATP + XMP bound state of PfGMPS. Decreased accessibility of R294 and K428 residues to trypsin in the ATP pyrophosphatase domain and reduced deuterium incorporation in the 143-155 region, pertaining to the glutaminase domain, suggest that in PfGMPS ligand-induced conformational changes are not only local but also transmitted over a long range across the domains. Overall, these results provide a detailed understanding of the substrate-induced changes in PfGMPS that could be essential for the overall catalytic process.
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Affiliation(s)
- Javaid Y Bhat
- Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
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33
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34
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Suzuki M, Yokoyama KI, Lee YH, Goto Y. A Two-Step Refolding of Acid-Denatured Microbial Transglutaminase Escaping from the Aggregation-Prone Intermediate. Biochemistry 2011; 50:10390-8. [DOI: 10.1021/bi2010619] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mototaka Suzuki
- Institute for Innovation, Ajinomoto Co., Inc., Suzuki-cho 1-1, Kawasaki-ku, Kawasaki
210-8681, Japan
- Institute
for Protein Research, Osaka University,
Yamadaoka 3-2, Suita, Osaka 565-0871,
Japan
| | - Kei-ichi Yokoyama
- Institute for Innovation, Ajinomoto Co., Inc., Suzuki-cho 1-1, Kawasaki-ku, Kawasaki
210-8681, Japan
| | - Young-Ho Lee
- Institute
for Protein Research, Osaka University,
Yamadaoka 3-2, Suita, Osaka 565-0871,
Japan
| | - Yuji Goto
- Institute
for Protein Research, Osaka University,
Yamadaoka 3-2, Suita, Osaka 565-0871,
Japan
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35
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Son SH, Yamagishi Y, Tani M, Yuasa M, Yamada K. Spectral Shifts of the Environment-sensitive Fluorophore POLARIC™ in Heterogeneous Interfaces. CHEM LETT 2011. [DOI: 10.1246/cl.2011.989] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Verma PK, Rakshit S, Mitra RK, Pal SK. Role of hydration on the functionality of a proteolytic enzyme α-chymotrypsin under crowded environment. Biochimie 2011; 93:1424-33. [DOI: 10.1016/j.biochi.2011.04.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 04/20/2011] [Indexed: 11/28/2022]
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37
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Koivunen JT, Nissinen L, Käpylä J, Jokinen J, Pihlavisto M, Marjamäki A, Heino J, Huuskonen J, Pentikäinen OT. Fluorescent Small Molecule Probe to Modulate and Explore α2β1 Integrin Function. J Am Chem Soc 2011; 133:14558-61. [DOI: 10.1021/ja206086c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | | | - Jarmo Käpylä
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
| | - Johanna Jokinen
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
| | | | | | - Jyrki Heino
- Department of Biochemistry and Food Chemistry, University of Turku, Finland
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Kudo K, Momotake A, Kanna Y, Nishimura Y, Arai T. Development of a quinoxaline-based fluorescent probe for quantitative estimation of protein binding site polarity. Chem Commun (Camb) 2011; 47:3867-9. [DOI: 10.1039/c1cc10183h] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Cyanine dyes in biophysical research: the photophysics of polymethine fluorescent dyes in biomolecular environments. Q Rev Biophys 2010; 44:123-51. [DOI: 10.1017/s0033583510000247] [Citation(s) in RCA: 294] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AbstractThe breakthroughs in single molecule spectroscopy of the last decade and the recent advances in super resolution microscopy have boosted the popularity of cyanine dyes in biophysical research. These applications have motivated the investigation of the reactions and relaxation processes that cyanines undergo in their electronically excited states. Studies show that the triplet state is a key intermediate in the photochemical reactions that limit the photostability of cyanine dyes. The removal of oxygen greatly reduces photobleaching, but induces rapid intensity fluctuations (blinking). The existence of non-fluorescent states lasting from milliseconds to seconds was early identified as a limitation in single-molecule spectroscopy and a potential source of artifacts. Recent studies demonstrate that a combination of oxidizing and reducing agents is the most efficient way of guaranteeing that the ground state is recovered rapidly and efficiently. Thiol-containing reducing agents have been identified as the source of long-lived dark states in some cyanines that can be photochemically switched back to the emissive state. The mechanism of this process is the reversible addition of the thiol-containing compound to a double bond in the polymethine chain resulting in a non-fluorescent molecule. This process can be reverted by irradiation at shorter wavelengths. Another mechanism that leads to non-fluorescent states in cyanine dyes is cis–trans isomerization from the singlet-excited state. This process, which competes with fluorescence, involves the rotation of one-half of the molecule with respect to the other with an efficiency that depends strongly on steric effects. The efficiency of fluorescence of most cyanine dyes has been shown to depend dramatically on their molecular environment within the biomolecule. For example, the fluorescence quantum yield of Cy3 linked covalently to DNA depends on the type of linkage used for attachment, DNA sequence and secondary structure. Cyanines linked to the DNA termini have been shown to be mostly stacked at the end of the helix, while cyanines linked to the DNA internally are believed to partially bind to the minor or major grooves. These interactions not only affect the photophysical properties of the probes but also create a large uncertainty in their orientation.
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40
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Nagasaki T, Tajiri Y, Shinkai S. New water-soluble calixarenes modified with amino acids at the upper rim. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19931120617] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Versee V, Barel AO. Interaction of 1-anilinonaphthalene-8-sulphonate (ANS) with egg-white lysozyme and bovine α-lactalbumin. Fluorescence study. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19760850808] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Vasilescu M, Bandula R, Lemmetyinen H. Micropolarity and microviscosity of Pluronics L62 and L64 core–shell aggregates in water at various concentrations and additives examined by absorption and fluorescence probes. Colloid Polym Sci 2010. [DOI: 10.1007/s00396-010-2247-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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43
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Bansal V, Delgado Y, Fasoli E, Ferrer A, Griebenow K, Secundo F, Barletta GL. Effect of prolonged exposure to organic solvents on the active site environment of subtilisin Carlsberg. JOURNAL OF MOLECULAR CATALYSIS. B, ENZYMATIC 2010; 64:38-44. [PMID: 20414456 PMCID: PMC2856654 DOI: 10.1016/j.molcatb.2010.01.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The potential of enzyme catalysis as a tool for organic synthesis is nowadays indisputable, as is the fact that organic solvents affect an enzyme's activity, selectivity and stability. Moreover, it was recently realized that an enzyme's initial activity is substantially decreased after prolonged exposure to organic media, an effect that further hampers their potential as catalysts for organic synthesis. Regrettably, the mechanistic reasons for these effects are still debatable. In the present study we have made an attempt to explain the reasons behind the partial loss of enzyme activity on prolonged exposure to organic solvents. Fluorescence spectroscopic studies of the serine protease subtilisin Carlsberg chemically modified with polyethylene glycol (PEG-SC) and inhibited with a Dancyl fluorophore, and dissolved in two organic solvents (acetonitrile and 1,4-dioxane) indicate that when the enzyme is initially introduced into these solvents, the active site environment is similar to that in water; however prolonged exposure to the organic medium causes this environment to resemble that of the solvent in which the enzyme is dissolved. Furthermore, kinetic studies show a reduction on both V(max) and K(M) as a result of prolonged exposure to the solvents. One interpretation of these results is that during this prolonged exposure to organic solvents the active-site fluorescent label inhibitor adopts a different binding conformation. Extrapolating this to an enzymatic reaction we argue that substrates bind in a less catalytically favorable conformation after the enzyme has been exposed to organic media for several hours.
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Affiliation(s)
- Vibha Bansal
- University of Puerto Rico at Humacao, Department of Chemistry, Humacao, Puerto Rico, 00791
| | - Yamixa Delgado
- University of Puerto Rico at Humacao, Department of Chemistry, Humacao, Puerto Rico, 00791
| | - Ezio Fasoli
- University of Puerto Rico at Humacao, Department of Chemistry, Humacao, Puerto Rico, 00791
| | - Amaris Ferrer
- University of Puerto Rico at Humacao, Department of Chemistry, Humacao, Puerto Rico, 00791
| | - Kai Griebenow
- University of Puerto Rico at Rio Piedras, Department of Chemistry, Milano, Italy
| | - Francesco Secundo
- Istituto di Chimica del Riconoscimento Molecolare, v. M. Bianco, Milano, Italy
| | - Gabriel L Barletta
- University of Puerto Rico at Humacao, Department of Chemistry, Humacao, Puerto Rico, 00791
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Pettersson-Kastberg J, Mossberg AK, Trulsson M, Yong YJ, Min S, Lim Y, O'Brien JE, Svanborg C, Mok KH. α-Lactalbumin, Engineered to be Nonnative and Inactive, Kills Tumor Cells when in Complex with Oleic Acid: A New Biological Function Resulting from Partial Unfolding. J Mol Biol 2009; 394:994-1010. [DOI: 10.1016/j.jmb.2009.09.026] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2009] [Revised: 08/18/2009] [Accepted: 09/14/2009] [Indexed: 11/28/2022]
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45
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Rodríguez-Lucena D, Ortiz Mellet C, Jaime C, Burusco KK, García Fernández JM, Benito JM. Size-Tunable Trehalose-Based Nanocavities: Synthesis, Structure, and Inclusion Properties of Large-Ring Cyclotrehalans. J Org Chem 2009; 74:2997-3008. [DOI: 10.1021/jo802796p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- David Rodríguez-Lucena
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
| | - Carmen Ortiz Mellet
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
| | - Carlos Jaime
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
| | - Kepa K. Burusco
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
| | - José M. García Fernández
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
| | - Juan M. Benito
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Apartado 553, E-41071 Sevilla, Spain, Departamento de Química, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain, and Instituto de Investigaciones Químicas, CSIC - Universidad de Sevilla, Américo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
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KELLA NAVINKUMARD, BARBEAU WILLIAME, KINSELLA JOHNE. Effect of disulfide bond cleavage on the structure and conformation of glycinin. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1986.tb01037.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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ARAKAWA TSUTOMU, KENNEY WILLIAMC. Secondary structure of interleukin-2(Alal25) in unfolded state*. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1988.tb00905.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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48
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KELLA NAVINKUMARD, RAO MNARASINGA. Effect of cetyl trimethyl ammonium bromide on the heat-induced denaturation and protein-protein interactions of arachin at pH 3.6. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1985.tb03195.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kim BB, Abdul Kadir H, Tayyab S. Bromophenol blue binding to mammalian albumins and displacement of albumin-bound bilirubin. Pak J Biol Sci 2008; 11:2418-2422. [PMID: 19137852 DOI: 10.3923/pjbs.2008.2418.2422] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Interaction of bromophenol blue (BPB) with serum albumins from different mammalian species, namely, human (HSA), bovine (BSA), goat (GSA), sheep (SSA), rabbit (RbSA), porcine (PSA) and dog (DSA) was studied using absorption and absorption difference spectroscopy. BPB-albumin complexes showed significant differences in the spectral characteristics, i.e., extent of bathochromic shift and hypochromism relative to the spectral features of free BPB. Absorption difference spectra of these complexes also showed variations in the position of maxima and absorption difference (deltaAbs.) values. Absorption difference spectra of different bilirubin (BR)-albumin complexes showed a significant blue shift accompanied by decrease in deltaAbs. values in presence of BPB which were indicative of the displacement of bound BR from its binding site in BR-albumin complexes. These changes in the difference spectral characteristics of BR-albumin complexes were more marked at higher BPB concentration. However, the extent of these changes was different for different BR-albumin complexes. Taken together, all these results suggest that BPB partially shares BR binding site on albumin and different mammalian albumins show differences in the microenvironment of the BR/BPB binding site.
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Affiliation(s)
- B Boon Kim
- Biomolecular Research Group, Biochemistry Programme, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Weaver JM, Lazarski CA, Richards KA, Chaves FA, Jenks SA, Menges PR, Sant AJ. Immunodominance of CD4 T cells to foreign antigens is peptide intrinsic and independent of molecular context: implications for vaccine design. THE JOURNAL OF IMMUNOLOGY 2008; 181:3039-48. [PMID: 18713974 DOI: 10.4049/jimmunol.181.5.3039] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Immunodominance refers to the restricted peptide specificity of T cells that are detectable after an adaptive immune response. For CD4 T cells, many of the mechanisms used to explain this selectivity suggest that events related to Ag processing play a major role in determining a peptide's ability to recruit CD4 T cells. Implicit in these models is the prediction that the molecular context in which an antigenic peptide is contained will impact significantly on its immunodominance. In this study, we present evidence that the selectivity of CD4 T cell responses to peptides contained within protein Ags is not detectably influenced by the location of the peptide in a given protein or the primary sequence of the protein that bears the test peptide. We have used molecular approaches to change the location of peptides within complex protein Ags and to change the flanking sequences that border the peptide epitope to now include a protease site, and find that immunodominance or crypticity of a peptide observed in its native protein context is preserved. Collectively, these results suggest immunodominance of peptides contained in complex Ags is due to an intrinsic factor of the peptide, based upon the affinity of that peptide for MHC class II molecules. These findings are discussed with regard to implications for vaccine design.
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Affiliation(s)
- Jason M Weaver
- David H. Smith Center for Vaccine Biology and Immunology, AaB Institute of Biomedical Sciences, Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA
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