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Electrochemically Gated Long-Distance Charge Transport in Photosystem I

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Montse López-Martínez, Manuel López-Ortiz, Maria Elena Antinori, Emilie Wientjes, Alba Nin-Hill, Carme Rovira, Roberta Croce, Ismael Díez-Pérez, Pau Gorostiza

Original languageEnglish
Pages (from-to)13280-13284
Number of pages5
JournalAngewandte Chemie - International Edition
Volume58
Issue number38
Early online date16 Jul 2019
DOIs
Accepted/In press23 Jun 2019
E-pub ahead of print16 Jul 2019
Published16 Sep 2019

King's Authors

Abstract

The transport of electrons along photosynthetic and respiratory chains involves a series of enzymatic reactions that are coupled through redox mediators, including proteins and small molecules. The use of native and synthetic redox probes is key to understanding charge transport mechanisms and to the design of bioelectronic sensors and solar energy conversion devices. However, redox probes have limited tunability to exchange charge at the desired electrochemical potentials (energy levels) and at different protein sites. Herein, we take advantage of electrochemical scanning tunneling microscopy (ECSTM) to control the Fermi level and nanometric position of the ECSTM probe in order to study electron transport in individual photosystem I (PSI) complexes. Current–distance measurements at different potentiostatic conditions indicate that PSI supports long-distance transport that is electrochemically gated near the redox potential of P700, with current extending farther under hole injection conditions.

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