Adsorption of unfolded Cu/Zn superoxide dismutase onto hydrophobic surfaces catalyzes its formation of amyloid fibrils

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Abstract

Intracellular aggregates of superoxide dismutase 1 (SOD1) are associated with amyotrophic lateral sclerosis. In vivo, aggregation occurs in a complex and dense molecular environment with chemically heterogeneous surfaces. To investigate how SOD1 fibril formation is affected by surfaces, we used an in vitro model system enabling us to vary the molecular features of both SOD1 and the surfaces, as well as the surface area. We compared fibril formation in hydrophilic and hydrophobic sample wells, as a function of denaturant concentration and extraneous hydrophobic surface area. In the presence of hydrophobic surfaces, SOD1 unfolding promotes fibril nucleation. By contrast, in the presence of hydrophilic surfaces, increasing denaturant concentration retards the onset of fibril formation. We conclude that the mechanism of fibril formation depends on the surrounding surfaces and that the nucleating species might correspond to different conformational states of SOD1 depending on the nature of these surfaces.

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  • Indian Institute of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
  • Biochemistry and Molecular Biology
  • Structural Biology
Original languageEnglish
JournalProtein Engineering Design & Selection
Early online date2019 Sep 6
Publication statusE-pub ahead of print - 2019 Sep 6
Publication categoryResearch
Peer-reviewedYes