Point mutations affecting yeast prion propagation change the structure of its amyloid fibrils

Анна Сулацкая, Станислав Александрович Бондарев, Максим Сулацкий, Нина Павловна Трубицина, Михаил Владимирович Белоусов, Галина Анатольевна Журавлева, Мануэль Льянос, Андрей Вилхович Каява, Ирина Кузнецова, Константин Туроверов

Результат исследований: Научные публикации в периодических изданияхстатья

Аннотация

We investigated the effect of the point substitutions in the N-terminal domain of the yeast prion protein Sup35 (Sup35NMp) on the structure of its amyloid fibrils. As the objects of the study, proteins with mutations that have different influence on the [PSI+] prion propagation, but do not prevent the aggregation of Sup35NMp in vitro were chosen. The use of the wide range of physicochemical methods allowed us to show significant differences in the structure of these aggregates, their physical size, clumping tendency. Also we demonstrated that the fluorescent probe thioflavin T (ThT) can be successfully used for investigation of subtle changes in the structural organization of fibrils formed from various Sup35NMp. The obtained results and our theoretical predictions allowed us to conclude that some of selected amino acid substitutions delimit the region of the protein that forms the core of amyloid fibrils, and change the fibrils structure. The relationship of structural features of in vitro Sup35NMp amyloid aggregates with the stability of the [PSI + ] prion in vivo allowed us to suggest that oligopeptide repeats (R) of the amyloidogenic N-terminal domain of Sup35NMp from R0 to R2 play a key role in protein aggregation. Their arrangement rather than just presence is critical for propagation of the strong [PSI + ] prion variants. The results confirm the suitability of the proposed combination of theoretical and empirical approaches for identifying changes in the amyloid fibrils structure, which, in turn, can significantly affect both the functional stability of amyloid fibrils and their pathogenicity.
Язык оригиналаанглийский
Номер статьи113618
Число страниц12
ЖурналJournal of Molecular Liquids
Том314
DOI
СостояниеПринято в печать - 15 июн 2020

Предметные области Scopus

  • Электроника, оптика и магнитные материалы
  • Физика конденсатов
  • Химия материалов
  • Атомная и молекулярная физика и оптика
  • Спектроскопия
  • Физическая и теоретическая химия

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    Сулацкая, А., Бондарев, С. А., Сулацкий, М., Трубицина, Н. П., Белоусов, М. В., Журавлева, Г. А., Льянос, М., Каява, А. В., Кузнецова, И., & Туроверов, К. (Принято в печать). Point mutations affecting yeast prion propagation change the structure of its amyloid fibrils. Journal of Molecular Liquids, 314, [113618]. https://doi.org/10.1016/j.molliq.2020.113618