Physiologically-relevant levels of sphingomyelin, but not GM1, induces a beta-sheet-rich structure in the amyloid-beta(1-42) monomer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F18%3A00106641" target="_blank" >RIV/00216224:14740/18:00106641 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.bbamem.2018.03.026" target="_blank" >http://dx.doi.org/10.1016/j.bbamem.2018.03.026</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.bbamem.2018.03.026" target="_blank" >10.1016/j.bbamem.2018.03.026</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Physiologically-relevant levels of sphingomyelin, but not GM1, induces a beta-sheet-rich structure in the amyloid-beta(1-42) monomer

Popis výsledku v původním jazyce

To resolve the contribution of ceramide-containing lipids to the aggregation of the amyloid-beta protein into beta sheet rich toxic oligomers, we employed molecular dynamics simulations to study the effect of cholesterol containing bilayers comprised of POPC (70% POPC, and 30% cholesterol) and physiologically relevant concentrations of sphingomyelin (SM) (30% SM, 40% POPC, and 30% cholesterol), and the GM1 ganglioside (5% GM1, 70% POPC, and 25% cholesterol). The increased bilayer rigidity provided by SM (and to a lesser degree, GM1) reduced the interactions between the SM-enriched bilayer and the N-terminus of A beta 42 (and also residues Ser26, Asn27, and Lys28), which facilitated the formation of a beta-sheet in the normally disordered N-terminal region. A beta 42 remained anchored to the SM-enriched bilayer through hydrogen bonds with the side chain of Arg5. With beta-sheets in the at the N and C termini, the structure of A beta 42 in the sphingomyelin-enriched bilayer most resembles beta-sheet-rich structures found in higher-ordered All fibrils. Conversely, when bound to a bilayer comprised of 5% GM1, the conformation remained similar to that observed in the absence of GM1, with A beta 42 only making contact with one or two GM1 molecules. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.

Název v anglickém jazyce

Physiologically-relevant levels of sphingomyelin, but not GM1, induces a beta-sheet-rich structure in the amyloid-beta(1-42) monomer

Popis výsledku anglicky

To resolve the contribution of ceramide-containing lipids to the aggregation of the amyloid-beta protein into beta sheet rich toxic oligomers, we employed molecular dynamics simulations to study the effect of cholesterol containing bilayers comprised of POPC (70% POPC, and 30% cholesterol) and physiologically relevant concentrations of sphingomyelin (SM) (30% SM, 40% POPC, and 30% cholesterol), and the GM1 ganglioside (5% GM1, 70% POPC, and 25% cholesterol). The increased bilayer rigidity provided by SM (and to a lesser degree, GM1) reduced the interactions between the SM-enriched bilayer and the N-terminus of A beta 42 (and also residues Ser26, Asn27, and Lys28), which facilitated the formation of a beta-sheet in the normally disordered N-terminal region. A beta 42 remained anchored to the SM-enriched bilayer through hydrogen bonds with the side chain of Arg5. With beta-sheets in the at the N and C termini, the structure of A beta 42 in the sphingomyelin-enriched bilayer most resembles beta-sheet-rich structures found in higher-ordered All fibrils. Conversely, when bound to a bilayer comprised of 5% GM1, the conformation remained similar to that observed in the absence of GM1, with A beta 42 only making contact with one or two GM1 molecules. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10608 - Biochemistry and molecular biology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES

ISSN

0005-2736

e-ISSN

—

Svazek periodika

1860

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

1709-1720

Kód UT WoS článku

000442333600013

EID výsledku v databázi Scopus

2-s2.0-85045553236