Sound- mediated nucleation and growth of amyloid fibrils

• 成果类型: Article
• 署名作者: Kozell, Anna; Solomonov, Aleksei; Gaidarov, Roman; Benyamin, Doron; Goldian, Irit Rosenhek -; Greenblatt, Harry Mark; Levy, Yaakov; Amir, Ariel; Raviv, Uri; Shimanovich, Ulyana
• 署名单位: Weizmann Institute of Science; Weizmann Institute of Science; Hebrew University of Jerusalem; Weizmann Institute of Science; Weizmann Institute of Science
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9512
• DOI: 10.1073/pnas.2315510121
• 发表日期: 2024-08-20
• 关键词: x-ray-scattering; d-plus software; protein microgels; human lysozyme; kinetics; disease

摘要

Mechanical energy, specifically in the form of ultrasound, can induce pressure variations and temperature fluctuations when applied to an aqueous media. These conditions can both positively and negatively affect protein complexes, consequently altering their stability, folding patterns, and self- assembling behavior. Despite much scientific progress, our current understanding of the effects of ultrasound on the self- assembly of amyloidogenic proteins remains limited. In the present study, we demonstrate that when the amplitude of the delivered ultrasonic energy is sufficiently low, it can induce refolding of specific motifs in protein monomers, which is sufficient for primary nucleation; this has been revealed by MD. These ultrasound- induced structural changes are initiated by pressure perturbations and are accelerated by a temperature factor. Furthermore, the prolonged action of low- amplitude ultrasound enables the elongation of amyloid protein nanofibrils directly from natively folded monomeric lysozyme protein, in a controlled manner, until it reaches a critical length. Using solution X- ray scattering, we determined that nanofibrillar assemblies, formed either under the action of sound or from natively fibrillated lysozyme, share identical structural characteristics. Thus, these results provide insights into the effects of ultrasound on fibrillar protein self- assembly and lay the foundation for the potential use of sound energy in protein chemistry.