Related Experiment Videos
A twisted four-sheeted model for an amyloid fibril
Jimin Wang1, Susanne Gülich, Catharine Bradford
1Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, New Haven, CN 06520, USA. jimin.wang@yale.edu
Structure (London, England : 1993)
|September 13, 2005
Summary
Researchers modeled amyloid fibril structure using X-ray diffraction. This cross-beta structure, based on Streptococcus protein G variants, may inform other amyloid fibril models.
Area of Science:
- Biophysics
- Structural Biology
- Biochemistry
Background:
- Amyloid fiber formation and deposition are hallmarks of severe human diseases.
- Understanding amyloid structure is crucial for disease mechanism insights.
Purpose of the Study:
- To propose a detailed structural model for amyloid fibrils.
- To utilize X-ray diffraction data for structural elucidation.
Main Methods:
- X-ray diffraction analysis.
- Development of a structural model for amyloid fibrils using protein G variants.
Main Results:
- A model was developed for amyloid fibrils with a four-beta-sheet bundle structure (45 A diameter).
- The fibril exhibits stacked layers forming an infinite beta sheet with helical twist (154 A periodicity).
Conclusions:
- The proposed model provides insights into the fundamental structure of cross-beta amyloid fibrils.
- The model's geometric principles may be applicable to other related amyloid structures.