https://scholars.lib.ntu.edu.tw/handle/123456789/633364
標題: | Modulation of Insulin Amyloid Fibrillization in Imidazolium-Based Ionic Liquids with Hofmeister Series Anions | 作者: | Vanik, Vladimir Bednarikova, Zuzana Fabriciova, Gabriela STEVEN SHENG-SHIH WANG Gazova, Zuzana Fedunova, Diana |
關鍵字: | amyloid aggregation | amyloid fibril morphology | Hofmeister series | ionic liquids | 公開日期: | 1-六月-2023 | 卷: | 24 | 期: | 11 | 來源出版物: | International Journal of Molecular Sciences | 摘要: | Amyloid fibrils have immense potential to become the basis of modern biomaterials. The formation of amyloid fibrils in vitro strongly depends on the solvent properties. Ionic liquids (ILs), alternative solvents with tunable properties, have been shown to modulate amyloid fibrillization. In this work, we studied the impact of five ILs with 1-ethyl-3-methylimidazolium cation [EMIM+] and anions of Hofmeisterseries hydrogen sulfate [HSO4−], acetate [AC−], chloride [Cl−], nitrate [NO3−], and tetrafluoroborate [BF4−] on the kinetics of insulin fibrillization and morphology, and the structure of insulin fibrils when applying fluorescence spectroscopy, AFM and ATR-FTIR spectroscopy. We found that the studied ILs were able to speed up the fibrillization process in an anion- and IL-concentration-dependent manner. At an IL concentration of 100 mM, the efficiency of the anions at promoting insulin amyloid fibrillization followed the reverse Hofmeister series, indicating the direct binding of ions with the protein surface. At a concentration of 25 mM, fibrils with different morphologies were formed, yet with similar secondary structure content. Moreover, no correlation with the Hofmeister ranking was detected for kinetics parameters. IL with the kosmotropic strongly hydrated [HSO4−] anion induced the formation of large amyloid fibril clusters, while the other kosmotropic anion [AC−] along with [Cl−] led to the formation of fibrils with similar needle-like morphologies to those formed in the IL-free solvent. The presence of the ILs with the chaotropic anions [NO3−] and [BF4−] resulted in longer laterally associated fibrils. The effect of the selected ILs was driven by a sensitive balance and interplay between specific protein–ion and ion–water interactions and non-specific long-range electrostatic shielding. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633364 | ISSN: | 16616596 | DOI: | 10.3390/ijms24119699 |
顯示於: | 化學工程學系 |
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