8KH2

Crystal structure of horse-spleen L-ferritin fused with amyloid beta peptide (1-42).

8KH2 の概要

• エントリーDOI: 10.2210/pdb8kh2/pdb
• 分子名称: Ferritin light chain,Amyloid-beta precursor protein (Fragment), CADMIUM ION, SULFATE ION, ... (5 entities in total)
• 機能のキーワード: ferritin cage, amyloid beta fusion, metal binding protein
• 由来する生物種: Equus caballus (horse); 詳細
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 25881.01

構造登録者

Maity, B.,Tian, J.,Abe, S.,Ueno, T. (登録日: 2023-08-21, 公開日: 2024-04-03, 最終更新日: 2024-05-15)

主引用文献

Maity, B.,Kameyama, S.,Tian, J.,Pham, T.T.,Abe, S.,Chatani, E.,Murata, K.,Ueno, T.
Fusion of amyloid beta with ferritin yields an isolated oligomeric beta-sheet-rich aggregate inside the ferritin cage.
Biomater Sci, 12:2408-2417, 2024

PubMed Abstract: Alzheimer's disease is a severe brain condition caused by the formation of amyloid plaques composed of amyloid beta (Aβ) peptides. These peptides form oligomers, protofibrils, and fibrils before deposition into amyloid plaques. Among these intermediates, Aβ oligomers (AβOs) were found to be the most toxic and therefore an appealing target for drug development and understanding their role in the disease. However, precise isolation and characterization of AβOs have proven challenging because AβOs tend to aggregate and form heterogeneous mixtures in solution. As a solution, we genetically fused the Aβ peptide with a ferritin monomer. Such fusion allowed the encapsulation of precisely 24 Aβ peptides inside the 24-mer ferritin cage. Using high-speed atomic force microscopy (HS-AFM), we disassembled ferritin and directly visualized the Aβ core enclosed within the cage. The thioflavin-T assay (ThT) and attenuated total reflection infrared spectroscopy (ATR-IR) revealed the presence of a β-sheet structure in the encapsulated oligomeric aggregate. Gallic acid, an amyloid inhibitor, can inhibit the fluorescence of ThT bound AβOs. Our approach represents a significant advancement in the isolation and characterization of β-sheet rich AβOs and is expected to be useful for future studies of other disordered peptides such as α-synuclein and tau.

PubMed: 38511491
DOI: 10.1039/d4bm00173g

実験手法

X-RAY DIFFRACTION (2 Å)