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Low Energy Optical Excitations as an Indicator of Structural Changes Initiated at the Termini of Amyloid Proteins

preprint
submitted on 16.10.2018 and posted on 17.10.2018 by KwangHyok Jong, Yavar T. Azar, Luca Grisanti, Amberley D. Stephens, Saul T.E. Jones, Dan Credgington, Gabi Kaminski, Ali Hassanali
We combine absorption and fluorscence spectroscopy experiments and theoretical modeling to specifically examine the role of termini interactions on the optical properties.
Optical absorption and fluorescence is measured for a six-chain amino acid 2Y3J (AIIGLM) which forms a segment of the full amyloid beta 1-40. In order to explore the sensitivity of the optical properties to the termini interactions, the experiments were repeated by acetylating the N-terminus.
Although atomic force microscopy experiments indicate the formation of some form of fibrilar or crystal aggregates in both systems, the optical properties are strikingly different - acetylation significantly reduces optical activity between 280-350 nm.

History

Email Address of Submitting Author

kjong@ictp.it

Institution

International Centre for Theoretical Physics

Country

Italy

ORCID For Submitting Author

0000-0001-5559-3972

Declaration of Conflict of Interest

The authors declare no competing financial interest.

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