Three-Step Resonance Energy Transfer in Insulin Amyloid Fibrils

  • Uliana Tarabara Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine https://orcid.org/0000-0002-7677-0779
  • Mykhailo Shchuka Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine
  • Kateryna Vus Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine http://orcid.org/0000-0003-4738-4016
  • Olga Zhytniakivska Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine https://orcid.org/0000-0001-9554-0090
  • Valeriya Trusova Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine https://orcid.org/0000-0002-7087-071X
  • Galyna Gorbenko Department of Medical Physics and Biomedical Nanotechnologies, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine http://orcid.org/0000-0002-0954-5053
  • Nikolai Gadjev Faculty of Chemistry and Pharmacy, Sofia University, “St. Kliment Ohridski”, Sofia, Bulgaria
  • Todor Deligeorgiev Faculty of Chemistry and Pharmacy, Sofia University, “St. Kliment Ohridski”, Sofia, Bulgaria
Keywords: cascade resonance energy transfer, 4-dimethylaminochalcone, fibrillar insulin, squaraine dyes, Thioflavin T

Abstract

The applicability of the three-step Förster resonance energy transfer (FRET) to detection of insulin amyloid fibrils was evaluated, using the chromophore system, containing Thioflavin T (ThT), 4-dimethylaminochalcone (DMC), and two squaraine dyes, referred to here as SQ1 and SQ4. The mediator chromophore DMC was found to enhance the fluorescence intensity of the terminal acceptor, SQ1, excited at 440 nm (at the absorption maximum of the principal donor, ThT), in fibrillar insulin compared to the system without DMC, providing the evidence for the cascade energy transfer in the chain ThT→DMC→SQ4→SQ1. Furthermore, the resulting Stokes shift in the four-chromophore system was 240 nm, as compared to 45 nm for the fibril-bound ThT, suggesting that higher signal-to-noise ratio is the advantage of amyloid fibril detection by multistep FRET. The maximum efficiencies of energy transfer in the insulin fibrils estimated from the quenching of the donor fluorescence in the presence of acceptor for the donor-acceptor pairs ThT-DMC, DMC-SQ4 and SQ4-SQ1 were 40%, 60% and 30% respectively, while negligible FRET occurred in the non-fibrillized protein. The most pronounced differences between fibrillar and non-fibrillized insulin were observed in the 3D fluorescence spectra. Specifically, two intensive spots centered at the emission wavelengths ~ 650 nm (SQ4) and ~ 685 nm (SQ1) were revealed at the excitation wavelength ~ 440 nm in the 3D patterns of insulin amyloid aggregates. In contrast, in the case of the non-fibrillized protein, the barely noticeable spots centered at the same wavelengths, as well as higher fluorescence intensities at the excitation above 550 nm were observed, suggesting the predominant impact of the direct excitation of SQ1 and SQ4 on their fluorescence responses. The inter-chromophore distances calculated from the experimental values of the energy transfer efficiency assuming the isotropic rotation of the dyes, were found to be 2.4, 4.5 and 4.3 nm for the ThT-DMC, DMC-SQ4 and SQ4-SQ1 pairs, respectively, revealing the different fibril binding sites for the examined dyes. The quantum-chemical calculations and simple docking studies provided evidence for the SQ1, SQ4 and ThT, DMC binding to the wet and dry interface of the insulin amyloid protofilament, respectively. The dye-protein complexes are likely to be stabilized by the hydrophobic, van der Waals, aromatic and electrostatic interactions. In summary, the above technique based on the multistep FRET can be employed for the identification and characterization of amyloid fibrils in vitro along with the classical ThT assay, allowing the increase of the amyloid detection sensitivity and lowering the probability of the pseudo-positive result.  The applicability of the multistep FRET for amyloid visualization in vivo can be also tested by the involvement of the near-infrared fluorescent dyes to the cascade.

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Published
2019-11-26
Cited
0 article
How to Cite
Tarabara, U., Shchuka, M., Vus, K., Zhytniakivska, O., Trusova, V., Gorbenko, G., Gadjev, N., & Deligeorgiev, T. (2019). Three-Step Resonance Energy Transfer in Insulin Amyloid Fibrils. East European Journal of Physics, (4), 58-69. https://doi.org/10.26565/2312-4334-2019-4-06

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