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Structure and Formation Mechanism of Amyloid Fibrils

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Biophysics".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 2361

Special Issue Editors


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Guest Editor
Accelerator Laboratory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
Interests: amyloid; biopolymers; infrared laser; terahertz radiation
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Guest Editor
CNRS, UPR 9080, Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, Université Paris Cité, 13 Rue Pierre et Marie Curie, 75005 Paris, France
Interests: amyloid; molecular dynamics of protein; RNA and lipid membrane

Special Issue Information

Dear Colleagues,

Amyloid fibrils are known to cause serious diseases such as neurodegenerative diseases and amyloidosis. Recently, it has been reported that lower-molecular-sized oligomers are found to be more toxic in cells than mature fibrils. The technology for the degradation of those amyloid assemblies has the potential for leading to amyloidosis therapy. However, the formation mechanism of amyloid fibrils is not completely understood, and it is usually difficult to degrade the rigid fibrous conformation under mild conditions unless using denaturants. This special issue welcomes structural studies focusing on the fibrils, proto-fibrils, and oligomers of various types of amyloid peptides and proteins. Especially uses of not only experimental techniques but also computer simulation methods for approaching the formation mechanisms of amyloid assemblies are acceptable. In addition, application studies of physical engineering techniques such as lasers and high-power radiations to develop novel therapeutic ways for amyloidosis should also be welcome.

Dr. Takayasu Kawasaki
Dr. Phuong H. Nguyen
Guest Editors

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Keywords

  • amyloid fibril
  • oligomer
  • proto-fibril
  • molecular simulation
  • laser
  • radiation

Published Papers (1 paper)

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Review

18 pages, 5492 KiB  
Review
Disassembly of Amyloid Fibril with Infrared Free Electron Laser
by Takayasu Kawasaki, Koichi Tsukiyama and Phuong H. Nguyen
Int. J. Mol. Sci. 2023, 24(4), 3686; https://doi.org/10.3390/ijms24043686 - 12 Feb 2023
Viewed by 1923
Abstract
Amyloid fibril causes serious amyloidosis such as neurodegenerative diseases. The structure is composed of rigid β-sheet stacking conformation which makes it hard to disassemble the fibril state without denaturants. Infrared free electron laser (IR-FEL) is an intense picosecond pulsed laser that is oscillated [...] Read more.
Amyloid fibril causes serious amyloidosis such as neurodegenerative diseases. The structure is composed of rigid β-sheet stacking conformation which makes it hard to disassemble the fibril state without denaturants. Infrared free electron laser (IR-FEL) is an intense picosecond pulsed laser that is oscillated through a linear accelerator, and the oscillation wavelengths are tunable from 3 μm to 100 μm. Many biological and organic compounds can be structurally altered by the mode-selective vibrational excitations due to the wavelength variability and the high-power oscillation energy (10–50 mJ/cm2). We have found that several different kinds of amyloid fibrils in amino acid sequences were commonly disassembled by the irradiation tuned to amide I (6.1–6.2 μm) where the abundance of β-sheet decreased while that of α-helix increased by the vibrational excitation of amide bonds. In this review, we would like to introduce the IR-FEL oscillation system briefly and describe combination studies of experiments and molecular dynamics simulations on disassembling amyloid fibrils of a short peptide (GNNQQNY) from yeast prion and 11-residue peptide (NFLNCYVSGFH) from β2-microglobulin as representative models. Finally, possible applications of IR-FEL for amyloid research can be proposed as a future outlook. Full article
(This article belongs to the Special Issue Structure and Formation Mechanism of Amyloid Fibrils)
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