Fingerprint-based deep neural networks can model thermodynamic and optical properties of eumelanin DHI dimers

Abstract

Eumelanin is the biopolymer responsible for photoprotection in living beings and holds great promise as a smart biomaterial, but its detailed structure has not been characterized experimentally. Theoretical models are urgently needed to improve our knowledge of eumelanin's function and exploit its properties, but the enormous amount of possible oligomer components has made modelling not possible until now. Here we show that the stability and lowest vertical optical absorption of 5,6-dihydroxyindole (DHI) eumelanin dimer components can be modeled with deep neural networks, using fingerprint-like molecular representations as input. In spite of the modest data set size, average errors of only 6 and 9% for stability and S1 absorption energy are obtained. Our fingerprints code the connectivity and oxidation patterns of the dimers in a straightforward, unambiguous way and can be extended to larger oligomers. This proof-of-principle work shows that machine learning can be applied to help solve the structural challenge of melanin.

Graphical abstract: Fingerprint-based deep neural networks can model thermodynamic and optical properties of eumelanin DHI dimers

Supplementary files

Article information

Article type
Edge Article
Submitted
01 May 2022
Accepted
03 Jul 2022
First published
04 Jul 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022, Advance Article

Fingerprint-based deep neural networks can model thermodynamic and optical properties of eumelanin DHI dimers

D. Bosch, J. Wang and L. Blancafort, Chem. Sci., 2022, Advance Article , DOI: 10.1039/D2SC02461F

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