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A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation

In humans, β-amyloid and islet amyloid polypeptide (IAPP, also known as amylin) aggregations are linked to Alzheimer's disease and type-2 diabetes, respectively. There is significant interest in better understanding the aggregation process by using chemical tools. Here, we show the ability of a...

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Autores principales: Sahoo, Bikash R., Genjo, Takuya, Nakayama, Takahiro W., Stoddard, Andrea K., Ando, Toshio, Yasuhara, Kazuma, Fierke, Carol A., Ramamoorthy, Ayyalusamy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6457205/
https://www.ncbi.nlm.nih.gov/pubmed/31015938
http://dx.doi.org/10.1039/c8sc05771k
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author Sahoo, Bikash R.
Genjo, Takuya
Nakayama, Takahiro W.
Stoddard, Andrea K.
Ando, Toshio
Yasuhara, Kazuma
Fierke, Carol A.
Ramamoorthy, Ayyalusamy
author_facet Sahoo, Bikash R.
Genjo, Takuya
Nakayama, Takahiro W.
Stoddard, Andrea K.
Ando, Toshio
Yasuhara, Kazuma
Fierke, Carol A.
Ramamoorthy, Ayyalusamy
author_sort Sahoo, Bikash R.
collection PubMed
description In humans, β-amyloid and islet amyloid polypeptide (IAPP, also known as amylin) aggregations are linked to Alzheimer's disease and type-2 diabetes, respectively. There is significant interest in better understanding the aggregation process by using chemical tools. Here, we show the ability of a cationic polymethacrylate-copolymer (PMAQA) to quickly induce a β-hairpin structure and accelerate the formation of amorphous aggregates of β-amyloid-1-40, whereas it constrains the conformational plasticity of amylin for several days and slows down its aggregation at substoichiometric polymer concentrations. NMR experiments and microsecond scale atomistic molecular dynamics simulations reveal that PMAQA interacts with β-amyloid-1-40 residues spanning regions K16-V24 and A30-V40 followed by β-sheet induction. For amylin, it binds strongly close to the amyloid core domain (NFGAIL) and restrains its structural rearrangement. High-speed atomic force microscopy and transmission electron microscopy experiments show that PMAQA blocks the nucleation and fibrillation of amylin, whereas it induces the formation of amorphous aggregates of β-amyloid-1-40. Thus, the reported study provides a valuable approach to develop polymer-based amyloid inhibitors to suppress the formation of toxic intermediates of β-amyloid-1-40 and amylin.
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spelling pubmed-64572052019-04-23 A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation Sahoo, Bikash R. Genjo, Takuya Nakayama, Takahiro W. Stoddard, Andrea K. Ando, Toshio Yasuhara, Kazuma Fierke, Carol A. Ramamoorthy, Ayyalusamy Chem Sci Chemistry In humans, β-amyloid and islet amyloid polypeptide (IAPP, also known as amylin) aggregations are linked to Alzheimer's disease and type-2 diabetes, respectively. There is significant interest in better understanding the aggregation process by using chemical tools. Here, we show the ability of a cationic polymethacrylate-copolymer (PMAQA) to quickly induce a β-hairpin structure and accelerate the formation of amorphous aggregates of β-amyloid-1-40, whereas it constrains the conformational plasticity of amylin for several days and slows down its aggregation at substoichiometric polymer concentrations. NMR experiments and microsecond scale atomistic molecular dynamics simulations reveal that PMAQA interacts with β-amyloid-1-40 residues spanning regions K16-V24 and A30-V40 followed by β-sheet induction. For amylin, it binds strongly close to the amyloid core domain (NFGAIL) and restrains its structural rearrangement. High-speed atomic force microscopy and transmission electron microscopy experiments show that PMAQA blocks the nucleation and fibrillation of amylin, whereas it induces the formation of amorphous aggregates of β-amyloid-1-40. Thus, the reported study provides a valuable approach to develop polymer-based amyloid inhibitors to suppress the formation of toxic intermediates of β-amyloid-1-40 and amylin. Royal Society of Chemistry 2019-02-27 /pmc/articles/PMC6457205/ /pubmed/31015938 http://dx.doi.org/10.1039/c8sc05771k Text en This journal is © The Royal Society of Chemistry 2019 http://creativecommons.org/licenses/by-nc/3.0/ This article is freely available. This article is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported Licence (CC BY-NC 3.0)
spellingShingle Chemistry
Sahoo, Bikash R.
Genjo, Takuya
Nakayama, Takahiro W.
Stoddard, Andrea K.
Ando, Toshio
Yasuhara, Kazuma
Fierke, Carol A.
Ramamoorthy, Ayyalusamy
A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title_full A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title_fullStr A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title_full_unstemmed A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title_short A cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
title_sort cationic polymethacrylate-copolymer acts as an agonist for β-amyloid and an antagonist for amylin fibrillation
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6457205/
https://www.ncbi.nlm.nih.gov/pubmed/31015938
http://dx.doi.org/10.1039/c8sc05771k
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