Ganglioside lipids accelerate α-synuclein amyloid formation

Ricardo Gaspar, Jon Pallbo, Ulrich Weininger, Sara Linse, Emma Sparr

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)

Abstract

The deposition of α-synuclein fibrils is one hallmark of Parkinson's disease. Here, we investigate how ganglioside lipids, present in high amounts in neurons and exosomes, influence the aggregation kinetics of α-synuclein. Gangliosides, as well as, other anionic lipid species with small or large headgroups were found to induce conformational changes of α-synuclein monomers and catalyse their aggregation at mildly acidic conditions. Although the extent of this catalytic effect was slightly higher for gangliosides, the results imply that charge interactions are more important than headgroup chemistry in triggering aggregation. In support of this idea, uncharged lipids with large headgroups were not found to induce any conformational change and only weakly catalyse aggregation. Intriguingly, aggregation was also triggered by free ganglioside headgroups, while these caused no conformational change of α-synuclein monomers. Our data reveal that partially folded α-synuclein helical intermediates are not required species in triggering of α-synuclein aggregation.

Original languageEnglish
Pages (from-to)1062-1072
Number of pages11
JournalBiochimica et Biophysica Acta - Proteins and Proteomics
Volume1866
Issue number10
DOIs
Publication statusPublished - 2018 Oct 1

Subject classification (UKÄ)

  • Biophysics

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