Effects of amino acid-functionalized silver nanoparticles on lysozyme amyloid fibrillogenesis

Sophie Shin Lu, You Ren Lai, Li Hsing Hsiao, Hsin Yi Huang, Ya Hui Tsai, Yun Chen, Steven S.S. Wang*, Yi Chun Yeh, Shen Long Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Amyloid fibrillogenesis of proteins have been considered as the major cause behind several degenerative diseases. Nanoparticles have been found to have great potential as a substrate for designing amyloid fibril inhibitors and/or modulators. This is mainly due to its ideal characteristics, such as small size, high surface area-to volume ratio, and modifiable surface. This study is aimed at examining the influence of amino acid-modified silver nanoparticles on amyloid fibril formation. We first synthesized and characterized the proline- and cysteine-functionalized silver nanoparticles (Pro-AgNP and Cys-AgNP). Next, the effects of functionalized silver nanoparticles on amyloid fibrillogenesis and structural changes of hen lysozyme were examined using various spectroscopic and biophysical tools. Our results showed that Pro-AgNP/Cys-AgNP dose-dependently suppressed lysozyme amyloid fibrillogenesis, whereas negligible fibril-inhibiting effect was observed in the bare AgNP or proline/cysteine. Moreover, reduced solvent exposure and α-to-β transition were detected in lysozyme upon the addition of Pro-AgNP/Cys-AgNP. Finally, the nature of interactions between lysozyme and Pro-AgNP/Cys-AgNP was further examined using fluorescence quenching and molecular docking. By altering the properties of nanoparticles to design suitable nanoprobes, we have shown that amyloid fibrillogenesis can be controlled.

Original languageEnglish
Article number113144
JournalColloids and Surfaces B: Biointerfaces
Volume222
DOIs
Publication statusPublished - 2023 Feb

Keywords

  • Amyloid fibril
  • Cysteine
  • Inhibition
  • Proline
  • Silver nanoparticle

ASJC Scopus subject areas

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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