alpha-Synuclein aggregation at low concentrations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10395403" target="_blank" >RIV/00216208:11310/19:10395403 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/19:10395403

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=30KncdIFRk" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=30KncdIFRk</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.bbapap.2019.05.003" target="_blank" >10.1016/j.bbapap.2019.05.003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

alpha-Synuclein aggregation at low concentrations

Popis výsledku v původním jazyce

Background: Aggregation of the neuronal protein alpha-synuclein into amyloid fibrils is a hallmark of Parkinson&apos;s disease. The propensity of alpha-synuclein to aggregate increases with the protein concentration. For the development of efficient inhibitors of alpha-synuclein aggregation, it is important to know the critical concentration of aggregation (the concentration of monomeric protein, below which the protein does not aggregate). Methods: We performed in vitro aggregation studies of alpha-synuclein at low concentrations (0.11-20 mu M). Aggregation kinetics was measured by ThT fluorescence. Obtained aggregates were characterized using CD-spectroscopy, fluorescent spectroscopy, dynamic light scattering and AFM imaging. Results: Monomeric alpha-synuclein at concentrations 0.45 mu M and above was able to bind to fibril ends resulting in fibril growth. At the protein concentrations below 0.4 mu M, monomers did not fibrillize, and fibrils disaggregated. In the absence of seeds, fibrils were formed only at monomer concentrations higher than 10 mu M. At low micromolar concentrations, we observed formation of prefibrillar amyloid aggregates, which are able to induce fibril formation in alpha-synuclein solutions of high concentrations. Conclusions: The critical concentration of a-synuclein fibril growth is similar to 0.4 mu M. Prefibrillar amyloid aggregates appear at concentrations between 0.45 and 3 mu M and are an intermediate state between monomers and fibrils. Although morphologically different from fibrils, prefibrillar aggregates have similar properties to those of fibrils. General significance: We determined the critical concentration of alpha-synuclein fibril growth. We showed that fibrils can grow at much lower monomer concentrations than that required for de novo fibril formation. We characterized a prefibrillar intermediate species formed upon aggregation of alpha-synuclein at low micromolar concentration.

Název v anglickém jazyce

alpha-Synuclein aggregation at low concentrations

Popis výsledku anglicky

Background: Aggregation of the neuronal protein alpha-synuclein into amyloid fibrils is a hallmark of Parkinson&apos;s disease. The propensity of alpha-synuclein to aggregate increases with the protein concentration. For the development of efficient inhibitors of alpha-synuclein aggregation, it is important to know the critical concentration of aggregation (the concentration of monomeric protein, below which the protein does not aggregate). Methods: We performed in vitro aggregation studies of alpha-synuclein at low concentrations (0.11-20 mu M). Aggregation kinetics was measured by ThT fluorescence. Obtained aggregates were characterized using CD-spectroscopy, fluorescent spectroscopy, dynamic light scattering and AFM imaging. Results: Monomeric alpha-synuclein at concentrations 0.45 mu M and above was able to bind to fibril ends resulting in fibril growth. At the protein concentrations below 0.4 mu M, monomers did not fibrillize, and fibrils disaggregated. In the absence of seeds, fibrils were formed only at monomer concentrations higher than 10 mu M. At low micromolar concentrations, we observed formation of prefibrillar amyloid aggregates, which are able to induce fibril formation in alpha-synuclein solutions of high concentrations. Conclusions: The critical concentration of a-synuclein fibril growth is similar to 0.4 mu M. Prefibrillar amyloid aggregates appear at concentrations between 0.45 and 3 mu M and are an intermediate state between monomers and fibrils. Although morphologically different from fibrils, prefibrillar aggregates have similar properties to those of fibrils. General significance: We determined the critical concentration of alpha-synuclein fibril growth. We showed that fibrils can grow at much lower monomer concentrations than that required for de novo fibril formation. We characterized a prefibrillar intermediate species formed upon aggregation of alpha-synuclein at low micromolar concentration.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10608 - Biochemistry and molecular biology

Projekt

<a href="/cs/project/ED4.1.00%2F16.0340" target="_blank" >ED4.1.00/16.0340: Modernizace vybavení pro fyzikální výzkum a výuku</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Biochimica et Biophysica Acta - Proteins and Proteomics

ISSN

1570-9639

e-ISSN

—

Svazek periodika

1867

Číslo periodika v rámci svazku

7-8

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

701-709

Kód UT WoS článku

000472814000003

EID výsledku v databázi Scopus

2-s2.0-85065874149