Multiphoton absorption in amyloid protein fibres
Journal article, 2013

Fibrillization of peptides leads to the formation of amyloid fibres, which, when in large aggregates, are responsible for diseases such as Alzheimer's and Parkinson's. Here, we show that amyloids have strong nonlinear optical absorption, which is not present in native non-fibrillized protein. Z-scan and pump-probe experiments indicate that insulin and lysozyme β-amyloids, as well as α-synuclein fibres, exhibit either two-photon, three-photon or higher multiphoton absorption processes, depending on the wavelength of light. We propose that the enhanced multiphoton absorption is due to a cooperative mechanism involving through-space dipolar coupling between excited states of aromatic amino acids densely packed in the fibrous structures. This finding will provide the opportunity to develop nonlinear optical techniques to detect and study amyloid structures and also suggests that new protein-based materials with sizable multiphoton absorption could be designed for specific applications in nanotechnology, photonics and optoelectronics.

DISEASE

FIBRILS

AGGREGATION

COOPERATIVE ENHANCEMENT

NONLINEAR-OPTICAL PROPERTIES

ORGANOMETALLIC COMPLEXES

DENDRIMER

DNA

2-PHOTON ABSORPTION

Author

Piotr Hanczyc

Chalmers, Chemical and Biological Engineering, Physical Chemistry

M.J. Samoć

Bengt Nordén

Chalmers, Chemical and Biological Engineering, Physical Chemistry

Nature Photonics

1749-4885 (ISSN)

Vol. 7 12 969-972

Subject Categories

Polymer Chemistry

Biological Systematics

Physical Chemistry

Materials Chemistry

Nano Technology

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Life Science Engineering (2010-2018)

Materials Science

Roots

Basic sciences

Driving Forces

Innovation and entrepreneurship

DOI

10.1038/nphoton.2013.282

More information

Created

10/8/2017