Download MendeleyRedesign of a thioflavin-T-binding protein with a flat beta-sheet to evaluate a thioflavin-T-derived photocatalyst with enhanced affinity.
Miura, Y., Namioka, S., Iwai, A., Yoshida, N., Konno, H., Sohma, Y., Kanai, M., Makabe, K.(2024) Int J Biol Macromol 269: 131992-131992
- PubMed: 38697433
- DOI: https://doi.org/10.1016/j.ijbiomac.2024.131992
- Primary Citation of Related Structures:
8XWG - PubMed Abstract:
Amyloids, proteinous aggregates with β-sheet-rich fibrils, are involved in several neurodegenerative diseases such as Alzheimer's disease; thus, their detection is critically important. The most common fluorescent dye for amyloid detection is thioflavin-T (ThT), which shows on/off fluorescence upon amyloid binding. We previously reported that an engineered globular protein with a flat β-sheet, peptide self-assembly mimic (PSAM), can be used as an amyloid binding model. In this study, we further explored the residue-specific properties of ThT-binding to the flat β-sheet by introducing systematic mutations. We found that site-specific mutations at the ThT-binding channel enhanced affinity. We also evaluated the binding of a ThT-based photocatalyst, which showed the photooxygenation activity on the amyloid fibril upon light radiation. Upon binding of the photocatalyst to the PSAM variant, singlet oxygen-generating activity was observed. The results of this study expand our understanding of the detailed binding mechanism of amyloid-specific molecules.
- Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jyonan, Yonezawa, Yamagata 992-8510, Japan.
Organizational Affiliation:
