Artificial light-driven signal chains are particularly important for the development of systems converting light into a current, into chemicals or for light-induced sensing. Here, we report on the construction of an all-protein, light-triggered, catalytic circuit based on photosystem I, cytochrome c (cyt c) and human sulfite oxidase (hSOX). The defined assembly of all components using a modular design results in an artificial biohybrid electrode architecture, combining the photophysical features of PSI with the biocatalytic properties of hSOX for advanced light-controlled bioelectronics. The working principle is based on a competitive switch between electron supply from the electrode or by enzymatic substrate conversion.

Biophysics of Photosynthesis Institute for Biology Humboldt University of Berlin Philippstrasse 13 Haus 18 10115 Berlin Germany

Biosystems Technology Institute of Applied Life Sciences Technical University of Applied Sciences Wildau Hochschulring 1 15475 Wildau Germany

Department of Chemical Physics and Optics Charles University Ke Karlovu 3 121 16 Prague Czech Republic

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