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De Sio S, Waegele J, Bhatia T, Voigt B, Lilie H, Ott M. Inherent Adaptivity of Alzheimer Peptides to Crowded Environments. Macromol Biosci 2023; 23:e2200527. [PMID: 37066978 DOI: 10.1002/mabi.202200527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/30/2023] [Indexed: 04/18/2023]
Abstract
Amyloid β (Aβ) is the major constituent in senile plaques of Alzheimer's disease in which peptides initially undergo structural conversions to form elongated fibrils. The impact of crowding on the fibrillation pathways of Aβ40 and Aβ42 , the most common peptide isoforms are studied. PEG and Ficoll are used as model crowders to mimic a macromolecular enriched surrounding. The fibrillar growth is monitored with the help of ThT-fluorescence assays in order to extract two rates describing primary and secondary processes of nucleation and growth. Techniques as fluorescence correlation spectroscopy and analytical ultracentrifugation are used to discuss oligomeric states; fibril morphologies are investigated using negative-staining transmission electron microscopy. While excluded volume effects imposed by macromolecular crowding are expected to always increase rates of intermolecular interactions and structural conversion, a vast variety of effects are found depending on the peptide, the crowder, or ionic strength of the solution. While investigations of the obtained rates with respect to a reactant-occluded model are capable to display specific surface interactions with the crowder, the employment of crystallization-like models reveal the crowder-induced entropic gain withΔ Δ G fib crow = - 116 ± 21 k $\Delta \Delta G_{\text{fib}}^{\text{crow}}=-116\pm 21\; k$ J mol-1 per volume fraction of the crowder.
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Affiliation(s)
- Silvia De Sio
- Department of Biotechnology and Biochemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, Halle, 06120, Saxony-Anhalt, Germany
| | - Jana Waegele
- Department of Biotechnology and Biochemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, Halle, 06120, Saxony-Anhalt, Germany
| | - Twinkle Bhatia
- Department of Biotechnology and Biochemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, Halle, 06120, Saxony-Anhalt, Germany
| | - Bruno Voigt
- Department of Physics, Martin-Luther-University Halle-Wittenberg, Betty-Heimann-Strasse 7, Halle, 06120, Saxony-Anhalt, Germany
| | - Hauke Lilie
- Department of Biotechnology and Biochemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, Halle, 06120, Saxony-Anhalt, Germany
| | - Maria Ott
- Department of Biotechnology and Biochemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, Halle, 06120, Saxony-Anhalt, Germany
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2
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Gupta T, Mondal AK, Pani I, Chattopadhyay K, Pal SK. Elucidating liquid crystal-aqueous interface for the study of cholesterol-mediated action of a β-barrel pore forming toxin. SOFT MATTER 2022; 18:5293-5301. [PMID: 35790122 DOI: 10.1039/d2sm00447j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Pore-forming toxins (PFTs) produced by pathogenic bacteria serve as prominent virulence factors with potent cell-killing activity. Most of the β-barrel PFTs form transmembrane oligomeric pores in the membrane lipid bilayer in the presence of cholesterol. The pore-formation mechanisms of the PFTs highlight well-orchestrated regulated events in the membrane environment, which involve dramatic changes in the protein structure and organization. Also, concerted crosstalk between protein and membrane lipid components appears to play crucial roles in the process. Membrane-damaging lesions formed by the pore assembly of the PFTs would also be expected to impose drastic alterations in the membrane organization, details of which remain obscure in most of the cases. Prior reports have established that aqueous interfaces of liquid crystals (LCs) offer promise as responsive interfaces for biomolecular events (at physiologically relevant concentrations), which can be visualized as optical signals. Inspired by this, herein, we sought to understand the lipid membrane interactions of a β-barrel PFT i.e., Vibrio cholerae cytolysin (VCC), using LC-aqueous interfaces. Our results show the formation of dendritic patterns upon the addition of VCC to the lipid embedded with cholesterol over the LC film. In contrast, we did not observe any LC reorientation upon the addition of VCC to the lipid-laden LC-aqueous interface in the absence of cholesterol. An array of techniques such as polarizing optical microscopy (POM), atomic force microscopy (AFM), and fluorescence measurements were utilized to decipher the LC response to the lipid interactions of VCC occurring at these interfaces. Altogether, the results obtained from our study provide a novel platform to explore the mechanistic aspects of the protein-membrane interactions, in the process of membrane pore-formation by the membrane-damaging PFTs.
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Affiliation(s)
- Tarang Gupta
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Mohali 140306, India.
| | - Anish Kumar Mondal
- Department of Biological Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Mohali 140306, India.
| | - Ipsita Pani
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Mohali 140306, India.
| | - Kausik Chattopadhyay
- Department of Biological Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Mohali 140306, India.
| | - Santanu Kumar Pal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Mohali 140306, India.
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3
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Narsineni L, Rao PPN, Pham AT, Foldvari M. Peptide-Modified Gemini Surfactants as Delivery System Building Blocks with Dual Functionalities for Glaucoma Treatment: Gene Carriers and Amyloid-Beta (Aβ) Self-Aggregation Inhibitors. Mol Pharm 2022; 19:2737-2753. [PMID: 35802484 DOI: 10.1021/acs.molpharmaceut.2c00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Retinal ganglion cell (RGC) neurodegeneration in glaucoma has potential links with amyloid-β (Aβ) deposition. Targeting the Aβ pathway was shown to reduce RGC apoptosis and protect RGCs from degeneration. We report exploratory studies on the amyloid Aβ40 aggregation inhibition properties of four cell adhesion peptide (CAP)-gemini surfactants that are intended as building blocks for gene carrier nanoparticles for glaucoma treatment. The CAP-gemini surfactants (18-7N(p1-4)-18) were evaluated as potential Aβ40 peptide aggregation inhibitors by a fluorescence kinetic assay and for their binding interactions with Aβ40 dimers by molecular docking studies. In vitro Aβ40 peptide aggregation inhibition studies showed that the 18-7N(p3)-18 and 18-7N(p1)-18 ligands inhibit Aβ40 peptide aggregation and prevent the formation of higher order structures. CDOCKER energies and CDOCKER interaction energies demonstrated that the CAP-gemini surfactants formed more stable complexes in the Aβ40 dimer assembly and underwent both polar and nonpolar interactions compared to CAP peptides alone. Also, 18-7N(p3)-18 showed a significantly lower CDOCKER energy compared to that of the unmodified gemini surfactant 18-7NH-18 (p < 0.0001) and 18-7N(p4)-18 (p < 0.001), 18-7N(p1)-18, and 18-7N(p2)-18. Similarly, 18-7N(p3)-18 showed a significantly lower CDOCKER interaction energy compared to that of 18-7NH-18, 18-7N(p4)-18 (p < 0.0001), and 18-7N(p2)-18 (p < 0.001), while 18-7N(p3)-18 and 18-7N(p1)-18 showed similar CDOCKER interaction energies. These studies suggest that a combination of both hydrophobic and electrostatic interactions contributes to the anti-Aβ40 aggregation activity of CAP-gemini surfactants. CAP-gemini surfactants showed 10-fold better Aβ40 peptide aggregation inhibition compared to previously reported values and could provide a new opportunity for glaucoma treatment as dual-functional gene carriers.
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4
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Wang H, Li A, Yang M, Zhao Y, Shi L, Ma R. Self-assembled nanochaperones enable the disaggregation of amyloid insulin fibrils. Sci China Chem 2021. [DOI: 10.1007/s11426-021-1155-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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5
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Wang Y, Mei D, Zhang X, Qu DH, Mei J. Visualizing Aβ deposits in live young AD model mice with a simple red/near-infrared-fluorescent AIEgen. Sci China Chem 2021. [DOI: 10.1007/s11426-021-1113-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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6
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Ma L, Yang S, Ma Y, Chen Y, Wang Z, James TD, Wang X, Wang Z. Benzothiazolium Derivative-Capped Silica Nanocomposites for β-Amyloid Imaging In Vivo. Anal Chem 2021; 93:12617-12627. [PMID: 34494815 PMCID: PMC8746709 DOI: 10.1021/acs.analchem.1c02289] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
![]()
Alzheimer’s
disease (AD) is a neurodegenerative disease,
and β-amyloid (Aβ) is believed to be a causative factor
in AD pathology. The abnormal deposition of Aβ is believed to
be responsible for progression of AD. In order to facilitate the imaging
of Aβ in vivo, suitable probe molecules with
a near-infrared emission wavelength that can penetrate the blood–brain
barrier (BBB) were utilized. The commercial fluorescent probe thioflavin-T
(ThT) is used to image Aβ; however, because of its short emission
wavelength and poor BBB penetration, ThT can only be used in vitro. With this research, based on ThT, we design three
fluorescent probes (SZIs) having a longer emission wavelength in order
to image Aβ aggregates. SZIs with different numbers of double
bonds respond to Aβ aggregates. The SZIs have a structure similar
to ThT, and as such, the SZIs are also unable to penetrate the BBB.
To deal with the problem, we develop nanocomposites (MSN-Lf@SZIs)
to deliver SZIs into the brain of AD mouse and image Aβ successfully.
These new nanocomposites are able to deliver the dyes into the brain
and facilitate Aβ imaging in vivo.
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Affiliation(s)
- Lijun Ma
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Shu Yang
- Department of Pharmacy, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - Yufan Ma
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yuzhi Chen
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhenguo Wang
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Tony D James
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Xuefei Wang
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhuo Wang
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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7
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Naftaly A, Izgilov R, Omari E, Benayahu D. Revealing Advanced Glycation End Products Associated Structural Changes in Serum Albumin. ACS Biomater Sci Eng 2021; 7:3179-3189. [PMID: 34143596 DOI: 10.1021/acsbiomaterials.1c00387] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structural alterations in proteins have a significant impact on their function and body physiology. Glycation via nonenzymatic forms of cross-linking leads to proteins' conformational changes, the macromolecule being recognized as a stable fibrillary structure, oligomerization, and becoming advanced glycation end products (AGEs). Protein that undergoes glycation-related modifications, namely, β-sheet enriched structural changes, are recognized as amyloid. In the current study, we characterized a single protein modified in vitro under physiological conditions to represent a protein glycation model. The glycation altered the helical conformation of serum albumin (SA) and promoted the formation of a β-sheet enriched with amyloid fibrils detected at multidimensional levels. The nanoscale resolution by spectroscopy in the presence of thioflavin-T (ThT) and 8-anilinonaphthalene-1-sulfonic acid (8-ANS) showed binding of the fibrils formed in the presence of glucose (GLU) and the carbonyl metabolites methylglyoxal (MGO) and glycolaldehyde (GAD). In the presence of MGO and GAD, the SA becomes insoluble aggregates, demonstrated by TEM microscopy and dynamic light scattering (DLS). The protein oligomerization was visualized when separated via SDS gel electrophoresis and mass photometry (MP) assays. Following the glycation, eventually, the material polymerized and became stiffer. The level of stiffness was analyzed by a rheometer that revealed a quick alteration under MGO and GAD. This is the first study to combine multiple spectroscopy assays, imaging, and rheology measurements of SA and to demonstrate a resolution on a nanoscale structural toward better resolution of the conformational changes of glycated SA, oligomerization, and protein aggregations under physiological conditions.
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Affiliation(s)
- Alex Naftaly
- Department of Cell and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Levanon St., P.O. Box 39040, Tel Aviv 6997801, Israel
| | - Roza Izgilov
- Department of Cell and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Levanon St., P.O. Box 39040, Tel Aviv 6997801, Israel
| | - Eman Omari
- Department of Cell and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Levanon St., P.O. Box 39040, Tel Aviv 6997801, Israel
| | - Dafna Benayahu
- Department of Cell and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Levanon St., P.O. Box 39040, Tel Aviv 6997801, Israel
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8
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Toprakcioglu Z, Knowles TPJ. Shear-mediated sol-gel transition of regenerated silk allows the formation of Janus-like microgels. Sci Rep 2021; 11:6673. [PMID: 33758259 PMCID: PMC7988050 DOI: 10.1038/s41598-021-85199-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 02/08/2021] [Indexed: 01/31/2023] Open
Abstract
Microcapsules and microgels consisting of macromolecular networks have received increasing attention due to their biomedical and pharmaceutical applications. Protein microgels and in particular silk-based microcapsules have desirable properties due to their biocompatibility and lack of toxicity. Typically such structures formed through emulsion templating are spherical in geometry due to interfacial tension. However, approaches to synthesis particles with more complex and non-spherical geometries are sought due to their packing properties and cargo release characteristics. Here, we describe a droplet-microfluidic strategy for generating asymmetric tubular-like microgels from reconstituted silk fibroin; a major component of native silk. It was determined using fluorescence microscopy, that the shear stress within the microchannel promotes surface protein aggregation, resulting in the asymmetric morphology of the microgels. Moreover, the structural transition that the protein undergoes was confirmed using FTIR. Crucially, the core of the microgels remains liquid, while the surface has fully aggregated into a fibrillar network. Additionally, we show that microgel morphology could be controlled by varying the dispersed to continuous phase flow rates, while it was determined that the radius of curvature of the asymmetric microgels is correlated to the wall shear stress. By comparing the surface fluorescence intensity of the microgels as a function of radius of curvature, the effect of the shear stress on the amount of aggregation could be quantified. Finally, the potential use of these asymmetric microgels as carriers of cargo molecules is showcased. As the core of the microgel remains liquid but the shell has gelled, this approach is highly suitable for the storage of bio-active cargo molecules such as antibodies, making such a delivery system attractive in the context of biomedical and pharmaceutical applications.
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Affiliation(s)
- Zenon Toprakcioglu
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Tuomas P J Knowles
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
- Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge, CB3 0HE, UK.
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9
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Marzano NR, Wray KM, Johnston CL, Paudel BP, Hong Y, van Oijen A, Ecroyd H. An α-Cyanostilbene Derivative for the Enhanced Detection and Imaging of Amyloid Fibril Aggregates. ACS Chem Neurosci 2020; 11:4191-4202. [PMID: 33226775 DOI: 10.1021/acschemneuro.0c00478] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The aggregation of proteins into amyloid fibrils has been implicated in the pathogenesis of a variety of neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease. Benzothiazole dyes such as Thioflavin T (ThT) are well-characterized and widely used fluorescent probes for monitoring amyloid fibril formation. However, existing dyes lack sensitivity and specificity to oligomeric intermediates formed during fibril formation. In this work, we describe the use of an α-cyanostilbene derivative (called ASCP) with aggregation-induced emission properties as a fluorescent probe for the detection of amyloid fibrils. Similar to ThT, ASCP is fluorogenic in the presence of amyloid fibrils and, upon binding and excitation at 460 nm, produces a red-shifted emission with a large Stokes shift of 145 nm. ASCP has a higher binding affinity to fibrillar α-synuclein than ThT and likely shares the same binding sites to amyloid fibrils. Importantly, ASCP was found to also be fluorogenic in the presence of amorphous aggregates and can detect oligomeric species formed early during aggregation. Moreover, ASCP can be used to visualize fibrils via total internal reflection fluorescence microscopy and, due to its large Stokes shift, simultaneously monitor the fluorescence emission of other labelled proteins following excitation with the same laser used to excite ASCP. Consequently, ASCP possesses enhanced and unique spectral characteristics compared to ThT that make it a promising alternative for the in vitro study of amyloid fibrils and the mechanisms by which they form.
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Affiliation(s)
- Nicholas R. Marzano
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Kelly M. Wray
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Caitlin L. Johnston
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Bishnu P. Paudel
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Yuning Hong
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Antoine van Oijen
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Heath Ecroyd
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
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10
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Rozniakowski K, Fraczyk A, Galecki K, Wietrzyk J, Filip-Psurska B, Fraczyk J, Kaminski ZJ, Kolesinska B. New Human Islet Amyloid Polypeptide Fragments Susceptible to Aggregation. Chem Biodivers 2020; 17:e2000501. [PMID: 32876375 DOI: 10.1002/cbdv.202000501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 07/28/2020] [Indexed: 12/21/2022]
Abstract
Human Islet Amyloid Polypeptide (hIAPP) plays a key role in the pathogenesis of type II diabetes. The aim of this research was to search for new amyloidogenic fragments of hIAPP. An initial attempt to predict the amyloidogenic cores of polypeptides/proteins using five different computer programs did not provide conclusive results. Therefore, we synthesized hIAPP fragments covering the entire hormone. The fragments were assessed for their aggregation ability, using recommended methods to search for the amyloidogenic fragments of the polypeptides/proteins. It was found that fragments (18-22) H-HSSNN-OH and (33-37) H-GSNTY-NH2 aggregate and form stable amyloid-like structures. Both of these fragments have a much higher antiproliferative activity relative to the RIN-5F cell compared to the (23-27) H-FGAIL-OH fragment widely regarded as the amyloidogenic core of amylin. The analog of (33-37) H-GSNTY-NH2 containing a free carboxy group on the C-terminal amino acid (H-GSNTY-OH) does not have amyloidogenic properties and can therefore be considered as a potential inhibitor of amylin aggregation. Research on the use of non-aggregating amylin fragments as potential hormone aggregation inhibitors is ongoing.
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Affiliation(s)
- Kamil Rozniakowski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Andrzej Fraczyk
- Institute of Applied Computer Science, Lodz University of Technology, Stefanowskiego Łódź, 18/22, Lodz, 90-537, Poland
| | - Krystian Galecki
- Institute of General Food Chemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, Lodz, 90-924, Poland
| | - Joanna Wietrzyk
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 12 Rudolfa Weigla St., 53-114, Wroclaw, Poland
| | - Beata Filip-Psurska
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 12 Rudolfa Weigla St., 53-114, Wroclaw, Poland
| | - Justyna Fraczyk
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Zbigniew J Kaminski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Beata Kolesinska
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
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11
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Li G, Yang W, Li W, Luo Y, Lim Y, Li Y, Paul A, Segal D, Hong L, Li Y. Rational Design of a Cocktail of Inhibitors against Aβ Aggregation. Chemistry 2020; 26:3499-3503. [DOI: 10.1002/chem.201905621] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 01/21/2020] [Indexed: 01/08/2023]
Affiliation(s)
- Gao Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education)Department of ChemistryTsinghua University 100084 Beijing P. R. China
- Institute of OceanographyMinjiang University 350108 Fuzhou P. R. China
| | - Wu‐Yue Yang
- Zhou Pei-Yuan Center for Applied MathematicsTsinghua University 100084 Beijing P. R. China
| | - Wen‐Hao Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education)Department of ChemistryTsinghua University 100084 Beijing P. R. China
| | - Yun‐Yi Luo
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education)Department of ChemistryTsinghua University 100084 Beijing P. R. China
| | - Yeh‐Jun Lim
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education)Department of ChemistryTsinghua University 100084 Beijing P. R. China
| | - Yang Li
- Institute for Science and TechnologyShandong University of, Traditional Chinese Medicine 250355 Jinan P. R. China
| | - Ashim Paul
- School of Molecular Microbiology & BiotechnologyTel Aviv University 69978 Tel Aviv Israel
| | - Daniel Segal
- School of Molecular Microbiology & BiotechnologyTel Aviv University 69978 Tel Aviv Israel
- Sagol Interdisciplinary School of NeurosciencesTel Aviv University 69978 Tel Aviv Israel
| | - Liu Hong
- Zhou Pei-Yuan Center for Applied MathematicsTsinghua University 100084 Beijing P. R. China
| | - Yan‐Mei Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education)Department of ChemistryTsinghua University 100084 Beijing P. R. China
- Beijing Institute for Brain Disorders 100069 Beijing P. R. China
- Center for Synthetic and Systems BiologyTsinghua University 100084 Beijing P. R. China
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12
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Li H, Chao J, Tian G, Hasan J, Jin Y, Zhang Z, Qin C. Resin-free peptide synthesis mediated by tri(4-benzoylphenyl) phosphate (TBP) derivatives as small-molecule supports. Org Chem Front 2020. [DOI: 10.1039/c9qo01480b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of novel tri(4-benzoylphenyl) phosphate (TBP) derivatives with unique precipitation-inducing properties were synthesized and used as C-terminal protecting groups of amino acids and recyclable supports in peptide synthesis.
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Affiliation(s)
- Haidi Li
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Jie Chao
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Guang Tian
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Jaafar Hasan
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Yatao Jin
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Zixin Zhang
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
| | - Chuanguang Qin
- Shaanxi Key Laboratory of Polymer Science & Technology
- OME Key Laboratory of Supernormal Material Physics & Chemistry
- School of Chemistry and Chemical Engineering
- Northwestern Polytechnical University
- Xi'an
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13
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Xu J, Hagler AT. Preface. Sci China Chem 2013. [DOI: 10.1007/s11426-013-4982-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Wu WH, Liu Q, Sun X, Yu JS, Zhao DS, Yu YP, Luo JJ, Hu J, Yu ZW, Zhao YF, Li YM. Fibrillar seeds alleviate amyloid-β cytotoxicity by omitting formation of higher-molecular-weight oligomers. Biochem Biophys Res Commun 2013; 439:321-6. [PMID: 24012671 DOI: 10.1016/j.bbrc.2013.08.088] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 11/20/2022]
Abstract
Amyloid-β (Aβ) peptides can exist in distinct forms including monomers, oligomers and fibrils, consisting of increased numbers of monomeric units. Among these, Aβ oligomers are implicated as the primary toxic species as pointed by multiple lines of evidence. It has been suggested that toxicity could be rendered by the soluble higher-molecular-weight (high-n) Aβ oligomers. Yet, the most culpable form in the pathogenesis of Alzheimer's disease (AD) remains elusive. Moreover, the potential interaction among the insoluble fibrils that have been excluded from the responsible aggregates in AD development, Aβ monomers and high-n oligomers is undetermined. Here, we report that insoluble Aβ fibrillar seeds can interact with Aβ monomers at the stoichiometry of 1:2 (namely, each Aβ molecule of seed can bind to two Aβ monomers at a time) facilitating the fibrillization by omitting the otherwise mandatory formation of the toxic high-n oligomers during the fibril maturation. As a result, the addition of exogenous Aβ fibrillar seeds is seen to rescue neuronal cells from Aβ cytotoxicity presumably exerted by high-n oligomers, suggesting an unexpected protective role of Aβ fibrillar seeds.
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Affiliation(s)
- Wei-hui Wu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, PR China; Institute of Chemical Defence, Beijing 102205, PR China
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Hsu JCC, Chen EHL, Snoeberger RC, Luh FY, Lim TS, Hsu CP, Chen RPY. Thioflavin T and its photoirradiative derivatives: exploring their spectroscopic properties in the absence and presence of amyloid fibrils. J Phys Chem B 2013; 117:3459-68. [PMID: 23458420 DOI: 10.1021/jp309331u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In this work, we found that, during storage or after UV irradiation, ThT is demethylated or oxidized, forming three derivatives. These three derivatives were purified by high performance liquid chromatography and characterized by mass and nuclear magnetic resonance spectroscopy and the spectroscopic properties of pure ThT and the derivatives carefully compared. Our results show that the emission peak at 450 nm results from oxidized ThT and not from the monomeric form of ThT, as previously proposed. The partial conversion of ThT into oxidized and demethylated derivatives has an effect on amyloid detection using ThT assay. Irradiated ThT has the same lag time as pure ThT in the amyloidogenesis of insulin, but the intensity of the emitted fluorescence is significantly decreased.
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Affiliation(s)
- Jack C-C Hsu
- Institute of Biological Chemistry, Academia Sinica, Taipei, 11529, Taiwan
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