Spectral properties and factors determining high quantum yield of thioflavin T incorporated in amyloid fibrils
Issue title: From Molecule to Tissue: XIII European Conference on the Spectroscopy of Biological Molecules, Palermo, Italy, August 28–September 2, 2009, Part 1 of 2
Affiliations: Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia | St. Petersburg State Polytechnical University, St. Petersburg, Russia
Note: [] Corresponding author: A.I. Sulatskaya, Institute of Cytology of the Russian Academy of Science, Tikhoretsky av. 4, 194064 St. Petersburg, Russia. Tel.: +7812 247 19 57; Fax: +7812 247 03 41; E-mail: [email protected].
Abstract: Benzthiazole dye thioflavin T (ThT) is widely used for studying amyloid fibrils structure and formation. Nevertheless, till now there is no common opinion concerning molecular mechanisms of ThT binding to amyloid fibrils and the reasons of dramatic increase of its fluorescence quantum yield on incorporation into amyloid fibrils. Our data prove that ThT molecules incorporate in amyloid fibrils in monomeric form and there is no ground to suppose the formation of ThT dimers, eximers, or micelles. It was shown that the increase of quantum yield of ThT incorporated in amyloid fibrils is caused by restriction of benzthiazole and aminobenzene rings torsion fluctuations about each other.
