Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.

The propensity of amyloid-β (Aβ) peptide to self-assemble into highly ordered amyloid structures lies at the core of their accumulation in the brain during Alzheimer's disease. By using all-atom explicit solvent replica exchange molecular dynamics simulations, we elucidated at the atomic level...

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Autores principales: Weixin Xu, Ce Zhang, Philippe Derreumaux, Astrid Gräslund, Ludmilla Morozova-Roche, Yuguang Mu
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Publicado: Public Library of Science (PLoS) 2011
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Acceso en línea:https://doaj.org/article/4079a91e85d845d3bf851bbc3640a3c0
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spelling oai:doaj.org-article:4079a91e85d845d3bf851bbc3640a3c02021-11-04T06:08:09ZIntrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.1932-620310.1371/journal.pone.0024329https://doaj.org/article/4079a91e85d845d3bf851bbc3640a3c02011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21957446/?tool=EBIhttps://doaj.org/toc/1932-6203The propensity of amyloid-β (Aβ) peptide to self-assemble into highly ordered amyloid structures lies at the core of their accumulation in the brain during Alzheimer's disease. By using all-atom explicit solvent replica exchange molecular dynamics simulations, we elucidated at the atomic level the intrinsic determinants of the pH-dependent dimerization of the central hydrophobic segment Aβ(12-24) and related these with the propensity to form amyloid fibrils measured by experimental tools such as atomic force microscopy and fluorescence. The process of Aβ(12-24) dimerization was evaluated in terms of free energy landscape, side-chain two-dimensional contact probability maps, β-sheet registries, potential mean force as a function of inter-chain distances, secondary structure development and radial solvation distributions. We showed that dimerization is a key event in Aβ(12-24) amyloid formation; it is highly prompted in the order of pH 5.0>2.9>>8.4 and determines further amyloid growth. The dimerization is governed by a dynamic interplay of hydrophobic, electrostatic and solvation interactions permitting some variability of β-sheets at each pH. These results provide atomistic insight into the complex process of molecular recognition detrimental for amyloid growth and pave the way for better understanding of the molecular basis of amyloid diseases.Weixin XuCe ZhangPhilippe DerreumauxAstrid GräslundLudmilla Morozova-RocheYuguang MuPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 9, p e24329 (2011)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Weixin Xu
Ce Zhang
Philippe Derreumaux
Astrid Gräslund
Ludmilla Morozova-Roche
Yuguang Mu
Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
description The propensity of amyloid-β (Aβ) peptide to self-assemble into highly ordered amyloid structures lies at the core of their accumulation in the brain during Alzheimer's disease. By using all-atom explicit solvent replica exchange molecular dynamics simulations, we elucidated at the atomic level the intrinsic determinants of the pH-dependent dimerization of the central hydrophobic segment Aβ(12-24) and related these with the propensity to form amyloid fibrils measured by experimental tools such as atomic force microscopy and fluorescence. The process of Aβ(12-24) dimerization was evaluated in terms of free energy landscape, side-chain two-dimensional contact probability maps, β-sheet registries, potential mean force as a function of inter-chain distances, secondary structure development and radial solvation distributions. We showed that dimerization is a key event in Aβ(12-24) amyloid formation; it is highly prompted in the order of pH 5.0>2.9>>8.4 and determines further amyloid growth. The dimerization is governed by a dynamic interplay of hydrophobic, electrostatic and solvation interactions permitting some variability of β-sheets at each pH. These results provide atomistic insight into the complex process of molecular recognition detrimental for amyloid growth and pave the way for better understanding of the molecular basis of amyloid diseases.
format article
author Weixin Xu
Ce Zhang
Philippe Derreumaux
Astrid Gräslund
Ludmilla Morozova-Roche
Yuguang Mu
author_facet Weixin Xu
Ce Zhang
Philippe Derreumaux
Astrid Gräslund
Ludmilla Morozova-Roche
Yuguang Mu
author_sort Weixin Xu
title Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
title_short Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
title_full Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
title_fullStr Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
title_full_unstemmed Intrinsic determinants of Aβ(12-24) pH-dependent self-assembly revealed by combined computational and experimental studies.
title_sort intrinsic determinants of aβ(12-24) ph-dependent self-assembly revealed by combined computational and experimental studies.
publisher Public Library of Science (PLoS)
publishDate 2011
url https://doaj.org/article/4079a91e85d845d3bf851bbc3640a3c0
work_keys_str_mv AT weixinxu intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
AT cezhang intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
AT philippederreumaux intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
AT astridgraslund intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
AT ludmillamorozovaroche intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
AT yuguangmu intrinsicdeterminantsofab1224phdependentselfassemblyrevealedbycombinedcomputationalandexperimentalstudies
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