1
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Paul S, Paul S. Controlling the self-assembly of human calcitonin: a theoretical approach using molecular dynamics simulations. Phys Chem Chem Phys 2021; 23:14496-14510. [PMID: 34184696 DOI: 10.1039/d1cp00825k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Human calcitonin (hCT) is a 32-residue amino acid poly-peptide hormone which is secreted by the C-cells (also known as parafollicular cells) of thyroid glands. It acts to inhibit osteoclast cell hormones by reducing the cell function and regulating calcium and phosphate in blood. hCT has a high tendency to assemble into protofilaments with β-sheet conformations. Amyloid fibril formation of hCT reduces its bio-activity and limits its application as a therapeutic drug. Salmon calcitonin (sCT), which also carries the same disulfide bridge at the N and C-terminus, but differs at the 16 residue position from hCT, has less propensity to aggregate than hCT. Human calcitonin has much higher bio-activity than sCT if its aggregation propensity is reduced. Substituting the key residues which are responsible for the aggregation of hCT, is one of the ways to reduce its aggregation and fibril formation. hCT analogues with less aggregation tendency can be exploited as therapeutic drugs. In this work, we study the amyloidogenic behavior of hCT and its peptide based derivatives i.e., sCT, phCT, N17H hCT, Y12L hCT and DM hCT, through classical molecular dynamics (MD) simulations. Our study reveals that sCT is the least aggregation prone derivative, and the double mutation at position 12 and 17 can reduce the aggregation propensity of this peptide. Also, we have applied these mutant variants of hCT as peptide inhibitors in the self-aggregation of hCT. This study could help in understanding and preparing peptide-based inhibitors for hCT fibrillation and their applications as therapeutic drugs.
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Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
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2
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Renawala HK, Chandrababu KB, Topp EM. Fibrillation of Human Calcitonin and Its Analogs: Effects of Phosphorylation and Disulfide Reduction. Biophys J 2020; 120:86-100. [PMID: 33220304 DOI: 10.1016/j.bpj.2020.11.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/24/2020] [Accepted: 11/10/2020] [Indexed: 11/16/2022] Open
Abstract
Some therapeutic peptides self-assemble in solution to form ordered, insoluble, β-sheet-rich amyloid fibrils. This physical instability can result in reduced potency, cause immunogenic side effects, and limit options for formulation. Understanding the mechanisms of fibrillation is key to developing rational mitigation strategies. Here, amide hydrogen-deuterium exchange with mass spectrometric analysis (HDX-MS) coupled with proteolytic digestion was used to identify the early stage interactions leading to fibrillation of human calcitonin (hCT), a peptide hormone important in calcium metabolism. hCT fibrillation kinetics was sigmoidal, with lag, growth, and plateau phases as shown by thioflavin T and turbidity measurements. HDX-MS of fibrillating hCT (pH 7.4; 25°C) suggested early involvement of the N-terminal (1-11) and central (12-19) fragments in interactions during the lag phase, whereas C-terminal fragments (20-32 and 26-32) showed limited involvement during this period. The residue-level information was used to develop phosphorylated hCT analogs that showed modified fibrillation that depended on phosphorylation site. Phosphorylation in the central region resulted in complete inhibition of fibrillation for the phospho-Thr-13 hCT analog, whereas phosphorylation in the N-terminal and C-terminal regions inhibited but did not prevent fibrillation. Reduction of the Cys1-Cys7 disulfide bond resulted in faster fibrillation with involvement of different hCT residues as indicated by pulsed HDX-MS. Together, the results demonstrate that small structural changes have significant effects on hCT fibrillation and that understanding these effects can inform the rational development of fibrillation-resistant hCT analogs.
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Affiliation(s)
- Harshil K Renawala
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana
| | - Karthik B Chandrababu
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana
| | - Elizabeth M Topp
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana; National Institute for Bioprocessing Research and Training, Dublin, Ireland.
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3
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Structure-based machine-guided mapping of amyloid sequence space reveals uncharted sequence clusters with higher solubilities. Nat Commun 2020; 11:3314. [PMID: 32620861 PMCID: PMC7335209 DOI: 10.1038/s41467-020-17207-3] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 06/18/2020] [Indexed: 02/08/2023] Open
Abstract
The amyloid conformation can be adopted by a variety of sequences, but the precise boundaries of amyloid sequence space are still unclear. The currently charted amyloid sequence space is strongly biased towards hydrophobic, beta-sheet prone sequences that form the core of globular proteins and by Q/N/Y rich yeast prions. Here, we took advantage of the increasing amount of high-resolution structural information on amyloid cores currently available in the protein databank to implement a machine learning approach, named Cordax (https://cordax.switchlab.org), that explores amyloid sequence beyond its current boundaries. Clustering by t-Distributed Stochastic Neighbour Embedding (t-SNE) shows how our approach resulted in an expansion away from hydrophobic amyloid sequences towards clusters of lower aliphatic content and higher charge, or regions of helical and disordered propensities. These clusters uncouple amyloid propensity from solubility representing sequence flavours compatible with surface-exposed patches in globular proteins, functional amyloids or sequences associated to liquid-liquid phase transitions. An increasing number of amyloid structures are determined. Here, the authors present the structure-based amyloid core sequence prediction method Cordax that is based on machine learning and allows the detection of aggregation-prone regions with higher solubility, disorder and surface exposure, and furthermore predicts the structural topology, orientation and overall architecture of the resulting putative fibril core.
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4
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Chen YT, Hu KW, Huang BJ, Lai CH, Tu LH. Inhibiting Human Calcitonin Fibril Formation with Its Most Relevant Aggregation-Resistant Analog. J Phys Chem B 2019; 123:10171-10180. [PMID: 31692350 DOI: 10.1021/acs.jpcb.9b08514] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The most common obstacles to the development of therapeutic polypeptides are peptide stability and aggregation. Human calcitonin (hCT) is a 32-residue hormone polypeptide secreted from the C-cells of the thyroid gland and is responsible for calcium and phosphate regulation in the blood. hCT reduces calcium levels by inhibiting the activity of osteoclasts, which are bone cells that are mainly responsible for breaking down the bone tissue or decreasing the resorption of calcium from the kidneys. Thus, calcitonin injection has been used to treat osteoporosis and Paget's disease of bone. hCT is an aggregation-prone peptide with a high tendency to form amyloid fibrils. As a result, salmon calcitonin (sCT), which is different from hCT at 16-residue positions and has a lower propensity to aggregate, has been chosen as a clinical substitute for hCT. However, significant side effects, including immune reactions, have been shown with the use of sCT injection. In this study, we found that two residues, Tyr-12 and Asn-17, play key roles in inducing the fibrillization of hCT. Double mutation of hCT at these two crucial sites could greatly enhance its resistance to aggregation and provide a peptide-based inhibitor to prevent amyloid formation by hCT. Double-mutated hCT retains its ability to interact with its receptor in vivo. These findings suggest that this variant of hCT would serve as a valuable therapeutic alternative to sCT.
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Affiliation(s)
- Yi-Ting Chen
- Department of Chemistry , National Taiwan Normal University , Taipei 116 , Taiwan
| | - Kai-Wei Hu
- Department of Chemistry , National Taiwan Normal University , Taipei 116 , Taiwan
| | - Bo-Jie Huang
- Graduate Institute of Biomedical Engineering , National Chung Hsing University , Taichung 402 , Taiwan
| | - Chian-Hui Lai
- Graduate Institute of Biomedical Engineering , National Chung Hsing University , Taichung 402 , Taiwan
| | - Ling-Hsien Tu
- Department of Chemistry , National Taiwan Normal University , Taipei 116 , Taiwan
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5
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Varadi M, De Baets G, Vranken WF, Tompa P, Pancsa R. AmyPro: a database of proteins with validated amyloidogenic regions. Nucleic Acids Res 2019; 46:D387-D392. [PMID: 29040693 PMCID: PMC5753394 DOI: 10.1093/nar/gkx950] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 10/10/2017] [Indexed: 01/05/2023] Open
Abstract
Soluble functional proteins may transform into insoluble amyloid fibrils that deposit in a variety of tissues. Amyloid formation is a hallmark of age-related degenerative disorders. Perhaps surprisingly, amyloid fibrils can also be beneficial and are frequently exploited for diverse functional roles in organisms. Here we introduce AmyPro, an open-access database providing a comprehensive, carefully curated collection of validated amyloid fibril-forming proteins from all kingdoms of life classified into broad functional categories (http://amypro.net). In particular, AmyPro provides the boundaries of experimentally validated amyloidogenic sequence regions, short descriptions of the functional relevance of the proteins and their amyloid state, a list of the experimental techniques applied to study the amyloid state, important structural/functional/variation/mutation data transferred from UniProt, a list of relevant PDB structures categorized according to protein states, database cross-references and literature references. AmyPro greatly improves on similar currently available resources by incorporating both prions and functional amyloids in addition to pathogenic amyloids, and allows users to screen their sequences against the entire collection of validated amyloidogenic sequence fragments. By enabling further elucidation of the sequential determinants of amyloid fibril formation, we hope AmyPro will enhance the development of new methods for the precise prediction of amyloidogenic regions within proteins.
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Affiliation(s)
- Mihaly Varadi
- Protein Data Bank in Europe, European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Greet De Baets
- MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
| | - Wim F Vranken
- Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium.,Interuniversity Institute of Bioinformatics in Brussels (IB) 2, ULB-VUB, Brussels, 1050, Belgium.,VIB Center for Structural Biology, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium
| | - Peter Tompa
- Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium.,VIB Center for Structural Biology, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium.,Institute of Enzymology, Research Centre for Natural Sciences of the HAS, Budapest, 1117, Hungary
| | - Rita Pancsa
- MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
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6
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Hamid AKM, Salvatore JC, Wang K, Murahari P, Guljas A, Rágyanszki A, Owen M, Jójárt B, Szőri M, Csizmadia IG, Viskolcz B, Fiser B. Oxidatively-mediated in silico epimerization of a highly amyloidogenic segment in the human calcitonin hormone (hCT15-19). Comput Biol Chem 2019; 80:259-269. [DOI: 10.1016/j.compbiolchem.2019.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/01/2019] [Accepted: 04/06/2019] [Indexed: 10/27/2022]
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7
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Tsiolaki PL, Katsafana AD, Baltoumas FA, Louros NN, Iconomidou VA. Hidden Aggregation Hot-Spots on Human Apolipoprotein E: A Structural Study. Int J Mol Sci 2019; 20:ijms20092274. [PMID: 31071995 PMCID: PMC6539603 DOI: 10.3390/ijms20092274] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/03/2019] [Accepted: 05/06/2019] [Indexed: 01/13/2023] Open
Abstract
Human apolipoprotein E (apoE) is a major component of lipoprotein particles, and under physiological conditions, is involved in plasma cholesterol transport. Human apolipoprotein E found in three isoforms (E2; E3; E4) is a member of a family of apolipoproteins that under pathological conditions are detected in extracellular amyloid depositions in several amyloidoses. Interestingly, the lipid-free apoE form has been shown to be co-localized with the amyloidogenic Aβ peptide in amyloid plaques in Alzheimer’s disease, whereas in particular, the apoE4 isoform is a crucial risk factor for late-onset Alzheimer’s disease. Evidence at the experimental level proves that apoE self-assembles into amyloid fibrilsin vitro, although the misfolding mechanism has not been clarified yet. Here, we explored the mechanistic insights of apoE misfolding by testing short apoE stretches predicted as amyloidogenic determinants by AMYLPRED, and we computationally investigated the dynamics of apoE and an apoE–Αβ complex. Our in vitro biophysical results prove that apoE peptide–analogues may act as the driving force needed to trigger apoE aggregation and are supported by the computational apoE outcome. Additional computational work concerning the apoE–Αβ complex also designates apoE amyloidogenic regions as important binding sites for oligomeric Αβ; taking an important step forward in the field of Alzheimer’s anti-aggregation drug development.
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Affiliation(s)
- Paraskevi L Tsiolaki
- Section of Cell Biology and Biophysics, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15701, Greece.
| | - Aikaterini D Katsafana
- Section of Cell Biology and Biophysics, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15701, Greece.
| | - Fotis A Baltoumas
- Section of Cell Biology and Biophysics, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15701, Greece.
| | - Nikolaos N Louros
- Section of Cell Biology and Biophysics, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15701, Greece.
| | - Vassiliki A Iconomidou
- Section of Cell Biology and Biophysics, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15701, Greece.
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8
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Khan IS, Loh KS, Petersson F. Amyloid and hyaline globules in undifferentiated nasopharyngeal carcinoma. Ann Diagn Pathol 2019; 40:1-6. [PMID: 30822626 DOI: 10.1016/j.anndiagpath.2019.02.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 02/17/2019] [Indexed: 10/27/2022]
Abstract
We characterize the clinicopathological features of two patients (one 38 year old woman and one 42 year old man, both of Chinese ethnicity) with Epstein Barr Virus positive non-keratinizing nasopharyngeal carcinoma from an endemic region with prominent presence of amyloid and one case with both amyloid and abundant intracytoplasmic hyaline globules. The amyloid material was positive for Congo red and showed apple green birefringence when examined under polarized light. The amyloid was immunoreactive for cytokeratins and was located both intra- and extracellularly. Frequently the amyloid had a light microscopical spherical appearance and displayed peripheral radiating fibrils from a central homogenous core. One of the patients had a unique presentation of nasopharyngeal carcinoma with perceived hemoptysis and coughing up two pieces of tumor tissue. In reality, the nasopharyngeal tumor was polypoid and the two fragments were pinched of from the main tumor mass.
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Affiliation(s)
- Irfan Sagir Khan
- Department of Pathology, National University Health System, Singapore
| | - Kwok Seng Loh
- Department of Otolaryngology - Head and Neck Surgery, National University Health System, Singapore
| | - Fredrik Petersson
- Department of Pathology, National University Health System, Singapore.
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9
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Tsiolaki PL, Nasi GI, Baltoumas FA, Louros NN, Magafa V, Hamodrakas SJ, Iconomidou VA. αCGRP, another amyloidogenic member of the CGRP family. J Struct Biol 2018; 203:27-36. [PMID: 29501724 DOI: 10.1016/j.jsb.2018.02.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/26/2018] [Accepted: 02/28/2018] [Indexed: 10/17/2022]
Abstract
The Calcitonin-gene related peptide (CGRP) family is a group of peptide hormones, which consists of IAPP, calcitonin, adrenomedullin, intermedin, αCGRP and βCGRP. IAPP and calcitonin have been extensively associated with the formation of amyloid fibrils, causing Type 2 Diabetes and Medullary Thyroid Carcinoma, respectively. In contrast, the potential amyloidogenic properties of αCGRP still remain unexplored, although experimental trials have indicated its presence in deposits, associated with the aforementioned disorders. Therefore, in this work, we investigated the amyloidogenic profile of αCGRP, a 37-residue-long peptide hormone, utilizing both biophysical experimental techniques and Molecular Dynamics simulations. These efforts unravel a novel amyloidogenic member of the CGRP family and provide insights into the mechanism underlying the αCGRP polymerization.
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Affiliation(s)
- Paraskevi L Tsiolaki
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Georgia I Nasi
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Fotis A Baltoumas
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Nikolaos N Louros
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Vassiliki Magafa
- Department of Pharmacy, University of Patras, Patras 26504, Greece.
| | - Stavros J Hamodrakas
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Vassiliki A Iconomidou
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
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10
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Kamgar-Parsi K, Tolchard J, Habenstein B, Loquet A, Naito A, Ramamoorthy A. Structural Biology of Calcitonin: From Aqueous Therapeutic Properties to Amyloid Aggregation. Isr J Chem 2016. [DOI: 10.1002/ijch.201600096] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kian Kamgar-Parsi
- Applied Physics Program; University of Michigan; Ann Arbor MI 48109-1040 USA
| | - James Tolchard
- Institute of Chemistry and Biology of Membranes and Nanoobjects, CNRS, CBMN, UMR 5248; University of Bordeaux; 33600 Pessac France
| | - Birgit Habenstein
- Institute of Chemistry and Biology of Membranes and Nanoobjects, CNRS, CBMN, UMR 5248; University of Bordeaux; 33600 Pessac France
| | - Antoine Loquet
- Institute of Chemistry and Biology of Membranes and Nanoobjects, CNRS, CBMN, UMR 5248; University of Bordeaux; 33600 Pessac France
| | - Akira Naito
- Graduate School of Engineering; Yokohama National University; 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry and Biophysics Program; University of Michigan; 930 North University Avenue Ann Arbor MI 48109-1055 USA
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11
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Exploring the ‘aggregation-prone’ core of human Cystatin C: A structural study. J Struct Biol 2015; 191:272-80. [DOI: 10.1016/j.jsb.2015.07.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/21/2015] [Accepted: 07/30/2015] [Indexed: 12/16/2022]
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12
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The route to protein aggregate superstructures: Particulates and amyloid-like spherulites. FEBS Lett 2015; 589:2448-63. [DOI: 10.1016/j.febslet.2015.07.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/02/2015] [Accepted: 07/06/2015] [Indexed: 12/15/2022]
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13
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Louros NN, Tsiolaki PL, Griffin MDW, Howlett GJ, Hamodrakas SJ, Iconomidou VA. Chameleon 'aggregation-prone' segments of apoA-I: A model of amyloid fibrils formed in apoA-I amyloidosis. Int J Biol Macromol 2015; 79:711-8. [PMID: 26049118 DOI: 10.1016/j.ijbiomac.2015.05.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 05/20/2015] [Accepted: 05/22/2015] [Indexed: 11/18/2022]
Abstract
Apolipoprotein A-I (apoA-I) is the major component of high density lipoproteins and plays a vital role in reverse cholesterol transport. Lipid-free apoA-I is the main constituent of amyloid deposits found in atherosclerotic plaques, an acquired type of amyloidosis, whereas its N-terminal fragments have been associated with a hereditary form, known as familial apoA-I amyloidosis. Here, we identified and verified four "aggregation-prone" segments of apoA-I with amyloidogenic properties, utilizing electron microscopy, X-ray fiber diffraction, ATR FT-IR spectroscopy and polarized light microscopy. These segments may act as conformational switches, possibly controlling the transition of the α-helical apoA-I content into the "cross-β" architecture of amyloid fibrils. A structural model illuminating the structure of amyloid fibrils formed by the N-terminal fragments of apoA-I is proposed, indicating that two of the identified chameleon segments may play a vital part in the formation of amyloid fibrils in familial apoA-I amyloidosis.
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Affiliation(s)
- Nikolaos N Louros
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Paraskevi L Tsiolaki
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Michael D W Griffin
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Geoffrey J Howlett
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Stavros J Hamodrakas
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Vassiliki A Iconomidou
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece.
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14
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Louros NN, Tsiolaki PL, Zompra AA, Pappa EV, Magafa V, Pairas G, Cordopatis P, Cheimonidou C, Trougakos IP, Iconomidou VA, Hamodrakas SJ. Structural studies and cytotoxicity assays of “aggregation-prone” IAPP8-16and its non-amyloidogenic variants suggest its important role in fibrillogenesis and cytotoxicity of human amylin. Biopolymers 2015; 104:196-205. [DOI: 10.1002/bip.22650] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 03/10/2015] [Accepted: 03/30/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Nikolaos N. Louros
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Paraskevi L. Tsiolaki
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | | | - Eleni V. Pappa
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Vassiliki Magafa
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - George Pairas
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Paul Cordopatis
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Christina Cheimonidou
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Ioannis P. Trougakos
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Vassiliki A. Iconomidou
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Stavros J. Hamodrakas
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
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15
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Thangakani AM, Kumar S, Nagarajan R, Velmurugan D, Gromiha MM. GAP: towards almost 100 percent prediction for β-strand-mediated aggregating peptides with distinct morphologies. Bioinformatics 2014; 30:1983-90. [DOI: 10.1093/bioinformatics/btu167] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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16
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Louros NN, Iconomidou VA, Tsiolaki PL, Chrysina ED, Baltatzis GE, Patsouris ES, Hamodrakas SJ. An N-terminal pro-atrial natriuretic peptide (NT-proANP) 'aggregation-prone' segment involved in isolated atrial amyloidosis. FEBS Lett 2013; 588:52-7. [PMID: 24220659 DOI: 10.1016/j.febslet.2013.10.049] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 10/08/2013] [Accepted: 10/30/2013] [Indexed: 01/18/2023]
Abstract
Isolated atrial amyloidosis (IAA) is a common localized form of amyloid deposition within the atria of the aging heart. The main constituents of amyloid fibrils are atrial natriuretic peptide (ANP) and the N-terminal part of its precursor form (NT-proANP). An 'aggregation-prone' heptapeptide ((114)KLRALLT(120)) was located within the NT-proANP sequence. This peptide self-assembles into amyloid-like fibrils in vitro, as electron microscopy, X-ray fiber diffraction, ATR FT-IR spectroscopy and Congo red staining studies reveal. Consequently, remedies/drugs designed to inhibit the aggregation tendency of this 'aggregation-prone' segment of NT-proANP may assist in prevention/treatment of IAA, congestive heart failure (CHF) or atrial fibrillation (AF).
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Affiliation(s)
- Nikolaos N Louros
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Vassiliki A Iconomidou
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Paraskevi L Tsiolaki
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece
| | - Evangelia D Chrysina
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 116 35, Greece
| | - Georgios E Baltatzis
- 1st Department of Pathology, Medical School, University of Athens, 75 Mikras Assias, Goudi 115 27, Greece
| | - Efstratios S Patsouris
- 1st Department of Pathology, Medical School, University of Athens, 75 Mikras Assias, Goudi 115 27, Greece
| | - Stavros J Hamodrakas
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 01, Greece.
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