Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 553034
Title Electrochemically Gated Long-Distance Charge Transport in Photosystem I
Author(s) López-Martínez, Montse; López-Ortiz, Manuel; Antinori, Maria Elena; Wientjes, Emilie; Nin-Hill, Alba; Rovira, Carme; Croce, Roberta; Díez-Pérez, Ismael; Gorostiza, Pau
Source Angewandte Chemie-International Edition 58 (2019)38. - ISSN 1433-7851 - p. 13280 - 13284.
DOI https://doi.org/10.1002/anie.201904374
Department(s) EPS
Biophysics
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) current decay - electrochemical gating - electron transfer - photosynthesis - scanning tunneling microscopy
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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